Relevant bibliographies by topics / Benthic organisms

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Academic literature on the topic 'Benthic organisms'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 April 2024

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Journal articles on the topic "Benthic organisms"

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Maatuil, Try J., Noldy G. F. Mamangkey, Indri S. Manembu, Farnis B. Boneka, Medy Ompi, and Henneke Pangkey. "FAUNA BENTOS BERUKURAN LEBIH DARI 1MM DI MUARA SUNGAI SARIO, KOTA MANADO." JURNAL PESISIR DAN LAUT TROPIS 10, no. 2 (2022): 123–31. http://dx.doi.org/10.35800/jplt.10.2.2022.54980.

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Benthic fauna is a group of benthic organisms that live on the bottom of the water or bottom of sedimentary grounds or among sediments. This study aims to understand the distribution and types of benthic faunal organisms measuring > 1mm in the Sario river at a depth of 1-3 m. Benthos sampling was carried out using a grab sampler with three repetitions. The benthic sediment sample was sieved using a 1000 m (1.0 mm) sieve. The sediment retained in the sieve was identified based on its morphological characters using a stereomicroscope. Furthermore, the number of organisms found was counted and analyzed according to the calculation of the ecological index. The results of the identification of benthic faunal organisms >1mm got a total of 60 individuals from 9 families earning an average density of 222.1 ind/m2, Diversity Index 1.04 (medium category), Uniformity Index 0.47 (medium category), and Dominance Index 0.44 (no one dominates).
 Keywords: Benthic Fauna, Sario River, Density, Ecological Index
 Abstrak
 Fauna bentos merupakan kelompok organisme bentos yang hidup di dasar perairan atau dasar sedimen maupun di antara sedimen. Penelitian ini bertujuan untuk mendapatkan gambaran distribusi dan jenis organisme fauna bentos yang berukuran > 1mm di daerah muara sungai Sario pada kedalaman 1-3 m. Pengambilan sampel bentos dilakukan dengan menggunakan grab sampler dengan pengulangan sebanyak tiga kali. Sampel sedimen bentos diayak menggunakan saringan 1000 µm (1,0 mm). Sedimen yang tertahan di saringan kemudian diidentifikasi berdasarkan karakter morfologi dengan menggunakan bantuan mikroskop stereo. Selanjutnya jumlah organisme yang ditemukan dihitung dan dianalisis menurut perhitungan indeks ekologi. Hasil identifikasi organisme fauna bentos
 >1mm mendapatkan total 60 individu dari 9 famili mendapatkan hasil rata-rata kepadatan 222,1 ind/m2, Indeks Keanekaragaman 1,04 (kategori sedang), Indeks Keseragaman 0,47 (kategori sedang) dan Indeks Dominansi 0,44 (tergolong tidak ada yang mendominasi).
 Kata Kunci: Fauna bentos, Muara Sungai Sari, Kelimpahan, Indeks ekologi
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Suryono, Chrisna Adhi. "Akumulasi Logam Berat Cr, Pb dan Cu dalam Sedimen dan Hubungannya dengan Organisme Dasar di Perairan Tugu Semarang." Jurnal Kelautan Tropis 19, no. 2 (2016): 143. http://dx.doi.org/10.14710/jkt.v19i2.841.

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The concentrations of metals in the marine sediment were found in coatal areas of Tugu Semarang. Three metals (Cr, Pb and, Cu) has found in coastal areas in research area. Shingly significantly those heavy metals have significantly influences on the abundance and diversity of benthic organisms. That has been proved by regression test which number of r= 0,99 on abundance and r= 0,92 on diversity. The increasing of heavy metals concentration will following of the number of abundance and diversity of benthic organisms in that area. Keywords: Metals, sediment,benthick organisms Konsentrasi logam berat telah ditemukan dalam sedimen laut ut di daerah pesisir Tugu Semarang. Tiga logam berat seperti (Cr, Pb, dan Cu) telah ditemukan di lokasi penelitian. Secara nyata terlihat bahwa logam tersebut berpengaruh terhadap kelimpahan dan keanekaragaman organisme dasar perairan. Hal tersebut dibuktikan dengan regresi berganda antara kelimpahan organisme dengan logam berat dalam sedimen dengan nilai r = 0,99, sedangkan hubungan antara keanekaragaman dengan dengan logam berat dalam sediemen dengan nilai r = 0,92. Peningkatan konsentrasi logam berat dalam sediiemen akan diikuti penurunan kelimpahan dan keanekaragaman organisme dasar perairan. Kata Kunci: Logam berat, sedimen, organisme dasar
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Tasabaramo, I. A., and A. H. Nugraha. "Abundance and Biodiversity of Benthic Infauna at Seagrass Ecosystem in Three Small Islands of Northern Papua, Indonesia: Liki Island, Meossu Island and Befondi Island." IOP Conference Series: Earth and Environmental Science 1148, no. 1 (2023): 012022. http://dx.doi.org/10.1088/1755-1315/1148/1/012022.

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Abstract One of the ecological roles of seagrass ecosystems is as a habitat for marine organisms. Benthos is a group of marine biota that lives on the bottom of the waters and can be found in seagrass ecosystems. This study aims to inventory the diversity of benthic organisms in seagrass ecosystems in Liki, Befondi and Meossu island. This research is part of the second leg of the Nusa Manggala Expedition which was held in 2018 on Liki Island, Meossu and Befondi, the northern waters of Papua.. Benthos data was collected using cores at 0 m, 50 m and 100 m on the line transect. The results of this study indicate that the highest density of seagrass is on Liki Island. In addition, 33 species of benthic organisms were found on Liki Island, 42 species on Meossu Island and 20 species on Befondi Island. The highest abundance and diversity of benthic organisms was found on Meossu Island. The dominant benthic organisms come from the gastropod class with the species having the highest abundance, Euplica scripta. Based on this research, it is suspected that there is a relationship between the condition of the seagrass ecosystem and the abundance and diversity of benthos.
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Hanibe, Jodi J., Noldy G. F. Mamangkey, Indri S. Manembu, Farnis B. Boneka, Medy Ompi, and Novie P. L. Pangemanan. "KEPADATAN DAN KEANEKARAGAMAN JENIS FAUNA BENTOS (>1MM) PADA DAERAH PECAHAN KARANG DI PERAIRAN KELURAHAN MOLAS TELUK MANADO." JURNAL PESISIR DAN LAUT TROPIS 10, no. 2 (2022): 132–40. http://dx.doi.org/10.35800/jplt.10.2.2022.54983.

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Benthic fauna is a group of benthic organisms that live on the bottom of the water or the bottom of the sediment or between sediments. This study aims to obtain an overview of the distribution and types of benthic faunal organisms measuring > 1mm in the waters of Molas Village at a depth of 1-3 m, especially around coral fragments. Benthos sampling was carried out using a grab sampler with three repetitions. The benthic sediment sample was sieved using a 1000 m (1.0 mm) sieve. The sediment retained in the sieve was then identified based on its morphological characters using a stereo microscope. Furthermore, the number of organisms found was counted and analyzed according to the calculation of the ecological index. The results of the identification of benthic faunal organisms >1mm obtained a total of 36 types of mollusks consisting of 34 species belonging to the class Gastropods and 2 species belonging to the class Bivalvia which were divided into 24 families and obtained an average density of 81.4 ind/m2, Diversity Index 1, 47 (medium category), Uniformity Index 0.97 (high category) and Dominance Index 0.27 (nothing dominates).
 Keywords: benthic ecology, grab sampling, Manado Bay
 
 ABSTRAK
 Fauna bentos merupakan kelompok organisme bentos yang hidup di dasar perairan atau dasar sedimen maupun di antara sedimen. Penelitian ini bertujuan untuk mendapatkan gambaran distribusi dan jenis organisme fauna bentos yang berukuran > 1mm di daerah perairan Kelurahan Molas padakedalaman 1-3 m khususnya di sekitar pecahan karang. Pengambilan sampel bentos dilakukan dengan menggunakan grab sampler dengan pengulangan sebanyak tiga kali. Sampel sedimen bentos diayak menggunakan saringan 1000 µm (1,0 mm). Sedimen yang tertahan di saringan kemudian diidentifikasi berdasarkan karakter morfologi dengan menggunakan bantuan mikroskop stereo. Selanjutnya jumlah organisme yang ditemukan dihitung dan dianalisis menurut perhitungan indeks ekologi.Hasil identifikasi organisme fauna bentos >1mm mendapatkan total 36 jenis moluska yang terdiri dari 34 spesies anggota kelas Gastropoda dan 2 spesies anggota kelas Bivalvia yang terbagi dalam 24 famili dan mendapatkan hasil rata-rata kepadatan 81,4 ind/m2, Indeks Keanekaragaman 1,47 (kategori sedang), Indeks Keseragaman 0,97 (kategori tinggi) dan Indeks Dominansi 0,27 (tergolong tidak ada yang mendominasi).
 Kata Kunci: Ekologi bentos, grab sampling, Teluk Manado
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Walsh, Kevin, J. Matthew Haggerty, Michael P. Doane, et al. "Aura-biomes are present in the water layer above coral reef benthic macro-organisms." PeerJ 5 (August 15, 2017): e3666. http://dx.doi.org/10.7717/peerj.3666.

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As coral reef habitats decline worldwide, some reefs are transitioning from coral- to algal-dominated benthos with the exact cause for this shift remaining elusive. Increases in the abundance of microbes in the water column has been correlated with an increase in coral disease and reduction in coral cover. Here we investigated how multiple reef organisms influence microbial communities in the surrounding water column. Our study consisted of a field assessment of microbial communities above replicate patches dominated by a single macro-organism. Metagenomes were constructed from 20 L of water above distinct macro-organisms, including (1) the coral Mussismilia braziliensis, (2) fleshy macroalgae (Stypopodium, Dictota and Canistrocarpus), (3) turf algae, and (4) the zoanthid Palythoa caribaeorum and were compared to the water microbes collected 3 m above the reef. Microbial genera and functional potential were annotated using MG-RAST and showed that the dominant benthic macro-organisms influence the taxa and functions of microbes in the water column surrounding them, developing a specific “aura-biome”. The coral aura-biome reflected the open water column, and was associated with Synechococcus and functions suggesting oligotrophic growth, while the fleshy macroalgae aura-biome was associated with Ruegeria, Pseudomonas, and microbial functions suggesting low oxygen conditions. The turf algae aura-biome was associated with Vibrio, Flavobacterium, and functions suggesting pathogenic activity, while zoanthids were associated with Alteromonas and functions suggesting a stressful environment. Because each benthic organism has a distinct aura-biome, a change in benthic cover will change the microbial community of the water, which may lead to either the stimulation or suppression of the recruitment of benthic organisms.
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Hudatwi, M., I. A. Syari, E. Utami, M. A. Nugraha, I. Akhrianti, and A. Pamungkas. "Diversity of Benthic Organisms on Artificial Reef Structure." IOP Conference Series: Earth and Environmental Science 926, no. 1 (2021): 012033. http://dx.doi.org/10.1088/1755-1315/926/1/012033.

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Abstract One of the methods of a marine rehabilitation program to accelerate the recovery of damaged coral reefs is to make artificial reefs as a new coral growth substrate. Interestingly, many benthic invertebrates overgrowth the artificial reef structures. The purpose of this study was to investigate the benthic organisms encrusting the artificial reefs including the cement and iron substrates. In June 2018, 10 artificial reef structures were deployed in 7-8m depth around Putri Island, Belinyu, Bangka Regency. The artificial reef structures were made in the form of an iron frame with a cement concrete weight. Colonization of sessile benthic organisms is generally marine invertebrates; Scleractinia corals, sponges, bivalves, hydrozoa, bryozoa, soft corals, gastropoda, crinoid, ascidian, and gorgonian. Natural recruited coral Pocillopora sp. was found in all artificial reef structures with colony sizes 3-8cm and surprisingly only coral pocillopora found adhered in iron frames and sinkers. The other benthic organisms are sponge, crinoid, and bryozoa with the number of densities are 2 organism/m2. Meanwhile, the lowest benthic density are groups of Mollusc and Ascidian with organism/m2. The type of succession that occurs in this research was likely a primary succession. The preference of benthic organisms among reefs appeared to be related to the proximity of natural hard-bottom habitat and type of iron and coating materials.
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Taboada, Sergi, Luis Francisco García-Fernández, Santiago Bueno, Jennifer Vázquez, Carmen Cuevas, and Conxita Avila. "Antitumoural activity in Antarctic and sub-Antarctic benthic organisms." Antarctic Science 22, no. 5 (2010): 494–507. http://dx.doi.org/10.1017/s0954102010000416.

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AbstractA prospecting search for antitumoural activity in polar benthic invertebrates was conducted on Antarctic and sub-Antarctic benthos in three different areas: Bouvet Island (sub-Antarctic), eastern Weddell Sea (Antarctica) and the South Shetland Islands (Antarctica). A total of 770 benthic invertebrate samples (corresponding to at least 290 different species) from 12 different phyla were assayed to establish their pharmacological potential against three human tumour cell lines (colorectal adenocarcinoma, lung carcinoma and breast adenocarcinoma). Bioassays resulted in 15 different species showing anticancer activity corresponding to five different phyla: Tunicata (5), Porifera (4), Cnidaria (3), Echinodermata (2) and Annelida (1). This appears to be the largest pharmacological study ever carried out in Antarctica and it shows very promising antitumoural activities in the Antarctic and sub-Antarctic benthos.
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Keiper, Joe B., and Dale A. Casamatta. "Benthic organisms as forensic indicators." Journal of the North American Benthological Society 20, no. 2 (2001): 311–24. http://dx.doi.org/10.2307/1468325.

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McKindsey, Christopher W., Philippe Archambault, Myriam D. Callier, and Frédéric Olivier. "Influence of suspended and off-bottom mussel culture on the sea bottom and benthic habitats: a review1This review is part of a virtual symposium on current topics in aquaculture of marine fish and shellfish." Canadian Journal of Zoology 89, no. 7 (2011): 622–46. http://dx.doi.org/10.1139/z11-037.

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Aquaculture is the fastest growing sector of the food industry, raising concerns about the influence of this activity on the environment. We take a holistic approach to review off-bottom and suspended mussel culture effects on the benthic environment and benthic communities. Both longline and “bouchot” mussel culture add much physical structure (infrastructure and mussels) to the environment, altering hydrosedimentary processes by modifying currents and increasing sedimentation locally, and providing habitat for many benthic organisms. Biodeposition from mussels and these organisms increases benthic organic loading and linked biogeochemical processes to influence O2, pH, redox potentials, dissolved sulphides, and other sediment parameters, benthic respiration and nutrient fluxes, and benthic infaunal communities. Mussel culture may also influence seagrasses and algae, although this has not been well-studied. Far-field effects on the benthos may occur through a number of mechanisms, including aggregation of epibenthic macrofauna in culture sites, alteration of plankton communities, and the enhancement of exotic and indigenous pest species owing to the addition of physical structure to the environment. Quantitative relationships between farming level and benthic influences are lacking, making predictions of effects difficult.
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Mansyur, Kasim, Achmad Rizal, Musayyadah Tis'in, Muh Saleh Nurdin, and Nuke Susanti. "Composition of coral species and benthic organism at Tiaka Oilfield, Tolo Bay, Central Sulawesi." Tomini Journal of Aquatic Science 1, no. 1 (2020): 22–28. http://dx.doi.org/10.37905/tjas.v1i1.5941.

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This research aims to find out the composition of the coral and benthic organisms at Tiaka Oilfield. This study was conducted in July 2015. Monitoring of coral and benthic organisms used line intercept transect and visual census method. The research results indicated that 16 coral species were consisting of 6 genera. Coral species dominated by the genus Acropora. Benthic organisms that live in symbiosis with coral reef ecosystems in the Tiaka Oil Field were found 11 benthic species consisting of 54 species
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Dissertations / Theses on the topic "Benthic organisms"

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Nappo, Michela. "Secondary metabolites from benthic organisms: ecological and chemical aspects." Doctoral thesis, Universitat de Barcelona, 2010. http://hdl.handle.net/10803/2627.

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This PhD Thesis deals with the study of marine natural products as candidates in either drug discovery and development. In particular, the investigation focused on benthic organisms, i.e. those fixed or in a close relation with the sea bottom. These organisms, many of which are sessile or slow-moving invertebrates, thus unable to escape quickly from their predators, and devoid of physical protection (shell or hard texture), have developed alternative protective strategies as well as the production of chemical weapons. Compounds involved in the chemical defence, besides the ecological function, can display interesting pharmacological activities. Organisms of different phyla (Algae, Molluscs and Cnidarians) and from diverse geographical areas (Mediterranean Sea and China) were investigated. The benthic diatom Cocconeis scutellum is able to affect the sex reversal in the protandric shrimp Hippolyte inermis, inducing apoptosis (programmed cell death) in the crustacean's androgenic gland. Thus, we wondered whether these diatoms could act also in other crustaceans and on human cancer cells, in order to evaluate their applications in aquaculture and medicine. In fact, some commercially important crustaceans show a bimodal pattern of growth, in which males grow faster and are bigger than females. For this reason, the production of all-male populations is more advantageous. The administration of proapoptotic compounds in an early larval phase could be a method to manipulate the sex in these crustaceans. Nevertheless, our study demonstrated that diatom compounds did not induce apoptosis in the androgenic gland of other species, suggesting a targeted and specific action of C. scutellum metabolites. On the other hand, the biological assays on human cancer cell lines showed that solid tumours were more responsive to C. scutellum than haematological tumours and normal cells, suggesting a specific toxic action of the diatom compounds. In addition, we demonstrated that the most active fraction to induce apoptosis in cancer cells was that containing the highest amount of eicosapentaenoic acid (EPA), described in the literature for its anticancer and proapoptotic properties. This fraction detained the cell cycle at G2/M phase and the results in terms of apoptosis and reduced cell viability produced by this fraction were comparable with those induced by EPA. Western blotting experiments showed that diatoms triggered apoptosis by the extrinsic pathway, i.e. by means of activation of caspase 8, and confirmed the involvement of effector caspase 3. In addition, C. scutellum was studied for the first time from the chemical point of view. By GC-MC we identified more than 100 compounds, mainly fatty acids, sterols and glycerides, and excluded the presence of short chain aldehydes.<br/>In collaboration with the University of Athens, the chemical study on the anaspidean mollusc Aplysia fasciata was carried out. From its digestive and hermaphroditic glands 16 metabolites were isolated by a combination of chromatographic techniques, and they were identified by spectroscopic analysis. Six of them (6-hydroxy-1-brasilene, epibrasilenol acetate, (3Z,9Z)-7-chloro-6-hydroxy-12-oxopentadeca-3,9-dien-1-yne, 6-epi-beta-snyderol, 16-acetoxy-15-bromo-7-hydroxy-9(11)-parguerene), belonging to different classes of sesquiterpene, acetogenin and diterpene compounds, are new and related with metabolites isolated from different species of the red alga Laurencia, the animal's diet. <br/>In the Istituto di Chimica Biomolecolare (Italy), the chemical and biological investigation on the Chinese soft coral Sinularia sp. was performed. We isolated four new casbene compounds, i.e. bicyclic diterpenes characterized by a cyclopropane fused with a 14-membered macrocycle, which are usually found in Euphorbiaceae plants and rarely in marine organisms. Contrastingly to most natural cis ring-fused casbenes, in Sinularia co-existed cis and trans compounds and this suggested a non-stereospecific biosynthetic mechanism. The 4 casbenes were active against Gram+ bacteria and just casbene 3 also against Gram- bacteria, only hydroxylated casbenes displayed anti-feeding properties, and they did not exhibit antiproliferative activity.<br><I>"Metabolitos secundarios de organismos bentónicos: aspectos ecológicos y químicos" <br/><br/>Depositada por Michela Nappo<br/><br/>TEXTO:<br/><br/>El objetivo de esta Tesis es el estudio de los productos naturales marinos y su posible relevancia en el desarrollo de nuevos medicamentos. La investigación se enfocó sobre los organismos bentónicos, i.e. los que viven en contacto con el fondo marino y que, a pesar de la falta de protección física y la escasa movilidad de la mayoría de las especies, han desarrollado mecanismos de defensa alternativos, como la producción de armas químicas. Estos compuestos, dotados de propiedades ecológicas, a menudo exhiben también importantes actividades farmacológicas. Se consideraron organismos pertenecientes a diferentes phyla (algas, moluscos y cnidarios) y áreas geográficas. Las diatomeas Cocconeis scutellum afectan la reversión sexual del decápodo proterándrico Hippolyte inermis, induciendo apoptosis (muerte celular programada) en la glándula androgénica del crustáceo. En esta Tesis evaluamos también la capacidad de dichas diatomeas en afectar el cambio de sexo de otros crustáceos, en particular los de interés comercial, y de actuar sobre las células tumorales humanas, a fin de encontrar posibles aplicaciones en acuicultura y medicina. También se valoró el patrón metabólico de las diatomeas mediante cromatografía de gases/espectrometría de masas, identificando más de 100 compuestos (ácidos grasos, esteroles y glicéridos), no constatándose la presencia de aldéhidos de cadena corta.<br/>En la Universidad de Atenas, se realizó el estudio químico del molusco anaspídeo Aplysia fasciata. Mediante diferentes técnicas cromatográficas y espectroscópicas, se aislaron 16 metabolitos, de los cuales seis eran nuevos (6-hidroxi-1-brasileno, epibrasilenol acetato, (3Z,9Z)-7-cloro-6-hidroxi-12-oxopentadeca-3,9-dien-1-ino, 6-epi-beta-snyderol, 16-acetoxi-15-bromo-7-hidroxi-9(11)-parguereno), relacionados con metabolitos de algas rojas del género Laurencia, que constituyen la dieta del animal.<br/>En el Instituto de Química Biomolecular (Pozzuoli, Italia) se realizó tanto el estudio químico como los experimentos biológicos con el coral blando Sinularia sp. procedente de China. De esta especie se aislaron 4 nuevos compuestos casbénicos (diterpenos bicíclicos formados por un anillo ciclopropánico fusionado a un macrociclo de 14 átomos) cuya estructura es frecuente en plantas de la familia Euphorbiaceae y bastante más rara en los organismos marinos. Los casbenos hidroxilados eran repelentes alimenticios; todos son activos frente a las bacterias Gram+ y sólo el casbeno 3 es también activo frente a las bacterias Gram- . </I>
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Segura, Sossa Catalina. "Effects of sediment transport on benthic organisms in a mountain river, CO." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3322535.

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Prendergast, Gabrielle Sara. "Settlement and Succession of Benthic Marine Organisms : Interactions between Physical and Biological Factors." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519483.

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Arthana, I. Wayan. "Study of benthic organisms as an indicator of pollution in the Whiteknights lakes." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389707.

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Roshon, Heather D. "Effects of the pyrethroid insecticide, tefluthrin, on benthic organisms, tubifex tubifex and chironomus riparius." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ35928.pdf.

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Fukushima, Tomohiko. "Ecological characteristics of deep-sea benthic organisms in relation to manganese nodules development practices." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145471.

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Galley, Elizabeth. "Responses of benthic organisms on the deep Antarctic continental shelf to a highly seasonal food supply." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288458.

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ROVETA, CAMILLA. "Biodiversity and Trace Elements: Community Assessments and Application of Benthic Organisms as Biomonitors of Environmental Pollution." Doctoral thesis, Università Politecnica delle Marche, 2022. http://hdl.handle.net/11566/299026.

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L’applicazione di organismi bioindicatori, per descrivere possibili cambiamenti dovuti a impatti antropici o naturali, è aumentata negli ultimi decenni grazie all’implementazione della legislazione Europea (es., Water Framework Directive, Marine Strategy). In quest’ottica il monitoraggio periodico delle comunità marine assume un ruolo cruciale. Obiettivo di questo progetto è stato la caratterizzazione delle comunità a idroidi (Cnidaria:Hydrozoa) e spugne (Porifera) delle isole di Montecristo e Giglio, appartenenti al Parco Nazionale dell’Arcipelago Toscano destinato a futura istituzione come Area Marina Protetta. Oltre ad aumentare le conoscenze sulle comunità marine delle due isole, i risultati ottenuti sono stati resi disponibili agli stakeholders per informarli sulle specie dei gruppi considerati presenti nell’area, sperando che possa essere d’aiuto nell’implementazione di nuove strategie di protezione. Inoltre, è stata condotta una revisione sistematica sull’applicazione di organismi bentonici (spugne, cnidari, briozoi, policheti, cirripedi, tunicati), proposti come bioindicatori non-convenzionali di elementi in tracce per le aree marine costiere. Infatti, ulteriore obiettivo del progetto è stato quello di esplorare il ruolo dei poriferi come bioindicatori di inquinamento da mercurio (Hg), tramite un’analisi multilivello (dalla comunità al gene). Grazie a uno studio preliminare su diverse specie, alcune sono state suggerite come migliori bioindicatori, tra cui Chondrosia reniformis, considerata per analisi successive. Infine, è stato esplorato il ruolo del microbiota associato alle spugne nei processi di bioaccumulo, per poter proporre questi organismi nella bioremediation. Oltre ad una caratterizzazione della comunità microbica di C. reniformis, quantità considerevoli di Hg sono state ritrovate all’interno del microbiota stesso, suggerendo suo un coinvolgimento non solo nel metabolismo secondario delle spugne, ma anche nei processi di bioaccumulo di Hg.<br>Periodic biodiversity assessments are of fundamental importance for describing possible changes in marine communities caused by natural or anthropogenic impacts. The application of different organisms as bioindicators of impacts and pollution has increased in the last decades thanks to the implementation of the European legislation (e.g., Water Framework Directive, Marine Strategy). In this context, the aim of this PhD project was to assess the hydroid (Cnidaria:Hydrozoa) and sponge (Porifera) communities of Montecristo and Giglio, two islands belonging to the Tuscan Archipelago National Park aimed to become a future Marine Protected Area. These data improve the knowledge on the zoobenthic communities of the studied area and have been also made available to stakeholders and policy makers, to inform them on the hydroid and sponge species present in the studied area, possibly helping in the implementation of new protection strategies. A systematic review was also conducted on the application of benthic organisms (sponges, cnidarians, bryozoans, polychaetes, cirripeds, tunicates), suggested as non-conventional bioindicators of trace elements in coastal shallow waters. In fact, this project also deepens the application of Porifera as biomonitoring tools for mercury (Hg) pollution, with a multi-level analysis (from the community to the individual). Thanks to a preliminary study on different species, a few were suggested as better bioindicators of Hg, among them the species Chondrosia reniformis, which was considered for further analysis. In addition, the role of sponges’ associated microbiota in the bioaccumulation processes was explored to identify these organisms also as useful tools in the bioremediation. The microbial community of the C. reniformis was characterized, and considerable amount of metal were detected in the microbiota itself, suggesting its possible implication not only in the secondary metabolism of the sponge but also in the bioaccumulation of Hg.
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Gascón, Garcia Stéphanie. "Estructura i dinàmica del sistema bentònic en llacunes costaneres dels aiguamolls de l'Empordà." Doctoral thesis, Universitat de Girona, 2003. http://hdl.handle.net/10803/7648.

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S'ha estudiat l'estructura i dinàmica del sistema bentònic de llacunes costaneres de la maresma dels aiguamolls de l'Empordà (NE de la península Ibèrica) i els factors que les determinen. Amb aquesta finalitat es van prendre mostres d'organismes del bentos (mensualment), nutrients i pigments de l'aigua (setmanalment) i el sediment (mensualment), així com paràmetres físics de l'aigua (setmanalment), durant dos cicles d'inundació (1997-1998 i 1998-1999). <br/>En aquesta maresma els factors determinants per als organismes bentònics i el contingut en nutrients del sediment són principalment físics: el grau de permanència de l'aigua, el confinament i la granulometria. De manera que els factors tròfics tenen menys pes que els físics tal com es posa de manifest amb les associacions de nematodes. El règim hídric de les llacunes integra des del grau de permanència de l'aigua fins a la salinitat i el confinament, per la qual cosa a partir de la caracterització dels diferents tipus de règim hídric es poden discriminar les tres tipologies d'ambients amb comunitats bentòniques diferenciades en l'estructura, la composició i la dinàmica temporal. Així, les tres comunitats diferenciades són: (1) la d'aigües permanents caracteritzada per una riquesa i diversitat elevades i constants en el temps, i per un nombre més elevat de tàxons sense adaptacions per passar situacions adverses; (2) la d'aigües semipermanents i temporànies d'inundació pulsativa, caracteritzada per una menor riquesa i diversitat, i per la dominància d'organismes amb estructures de resistència per passar la fase seca i aguantar condicions desfavorables, i (3) la d'aigües temporànies d'inundació continuada, caracteritzada per una major variabilitat de la riquesa i diversitat al llarg del cicle i per una singularitat taxonòmica més elevada, ja que s'observen cladòcers i una major representació taxonòmica dels insectes. <br/>Durant la realització d'aquest estudi els dos cicles d'inundació van suposar entrades d'aigua en el sistema diferents, per això es va diferenciar un cicle humit (1997-1998) i un de sec (1998-1999). En relació amb la major importància de les entrades d'aigua en el sistema, es va observar un contingut en nutrients de l'aigua significativament superior durant el cicle humit. Pel que fa al sediment, la seva major inèrcia explicaria la manca de diferències significatives en el contingut en nutrients del sediment del cicle humit i del sec. Ara bé, sí que s'observa diferència en la composició d'organismes. Així, la variabilitat interanual en l'estructura de la comunitat bentònica de la maresma es pot atribuir a una situació d'estrès provocada pel cicle sec. Aquesta situació va comportar un augment de la diversitat per disminució de la dominància a totes les llacunes estudiades, determinada, en gran manera, per la disminució de l'abundància original de poblacions dominants i característiques d'ambients permanents, Corophium orientale, o temporànies, Gammarus aequicauda. <br/><br/>No existeix un patró estacional en les comunitats estudiades, sinó que els principals canvis en el plàncton i el bentos són deguts a pertorbacions hídriques. Aquestes pertorbacions provoquen que s'estableixi una situació en què dominen uns tàxons característics en el plàncton (Synchaeta i Eutintinnus) i, en canvi, que en el bentos es perdi l'estructura pròpia de les comunitats característiques dels diferents ambients (comunitats dominades per Corophium orinetale en aigües permanents i per Chironomus salinarius en temporànies). La severitat és diferent en funció del grau de permanència de l'aigua, i és més alta en ambients permanents i més baixa en els temporanis. La major severitat en ambients permanents ve determinada per la menor adaptació del bentos d'aigües permanents a les fluctuacions ambientals i a l'efecte de la predació sobre el plàncton. A més, tant en el bentos com en el plàncton es donen fenòmens d'histèresi, segons els quals l'efecte de la pertorbació no solament depèn de la causa pertorbadora sinó també de l'estat en què es troba la comunitat en el moment de la pertorbació.<br>The structure and dynamic of the benthic system, and the main factors that control this system have been studied in coastal basins of the Empordà wetlands (NE Iberian Peninsula). During two hydroperiods (1197-1998; 1998-1999) organisms and sediment samples (nutrient and pigment analysis) have been taken monthly, and water samples (nutrient and pigment analysis) and physic and chemical parameters (Tª, Conductivity, Oxygen and pH) have been taken weekly. <br/><br/>In these wetlands benthic organisms and sediment nutrient content were mainly determined by physics factors as water permanence, confinement and granulometry. Trophic factors were less important for the benthic communities than physics ones, as it has been shown by the nematodes associations. Based on the hydrological pattern, three types of basins are distinguished: permanent waters (type 1), temporary waters with pulse water inputs (type 2), and temporary waters with continuous water inputs (type 3). These three types are in agreement with the classification resulting from the benthic communities composition. The type 1 basins, where the more stable environemental conditions were found, had a community characterized by a high density of individuals, total biomass and diversity. The community of type 2 basins had lower richness and diversity values with little temporal variability. Organisms with resistant structures to pass the dry phase and survive adverse conditions were dominant in these community. The high frequency of freshwater inputs in type 3 basins causes a high taxonomic singularity and high temporal variability of species richness and diversity in these basins.<br/>The water input in the wetlands was significantly different for the two hydroperiods studied, so we can distinguish a wet hydroperiod (1197-1998) and a dry hydroperiod (1998-1999). Significantly higher nutrient content in the water was observed related to more important water entrance during the wet hydroperiod. The lack of significant differences on nutrient content of sediment between hydroperiods could be explained by a higher inertia in the benthic system. Differences in faunal composition were observed between hydroperiods. Thus, the interannual variability in the benthic community structure could be attributed to the stress situation caused by the dry hydroperiod. This situation implies a diversity increase due to a highest evenness because the dominant species decrease its relative abundance. <br/>The main plankton and benthos changes were due to hydrological perturbations, so seasonal patterns did not have any relevance to the studied communities. In the plankton community hydrological perturbations caused a new situation (situation dominated by Synchaeta and Eutintinnus), while in the benthos communities provokes a lost of the characteristic structure (characteristic structure were communities dominated by Corophium orientale in permanent waters, and by Chironomus salinarius in temporary waters). The severity varied depending on water permanence, so it was higher in permanent systems and lower in temporary ones. The higher severity in permanent systems was conditioned by the low adaptation to environmental fluctuations of the benthos which lives in permanent waters, and to the effect of predation on the plankton community. Moreover, histeresy phenomenons were observed, since the effects of perturbation were not only caused by the perturbation but also by the community status when the perturbation started.
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Bergeron, Christine M. "THE impact of sediment resuspension on mercury cycling and the bioaccumulation of methylmercury into benthic and pelagic organisms." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2985.

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Thesis (M.S.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Books on the topic "Benthic organisms"

1

Richardson, Monte. Identification of benthic organisms from the Gulf of Maine. Huxley College of the Environment, Western Washington University, 2006.

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W, Black Robert. The development and evaluation of a benthic index of biological integrity for the Cedar River Watershed, Washington. U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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R, Thoms Sharon, ed. Models for alteration of sediments by benthic organisms: Project 92-NPS-2, 1995. Water Environment Research Foundation, 1995.

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Mary-Frances, Thompson, Sarojini Rachakonda, Nagabhushanam Rachakonda, and International Conference on the Biology of Benthic Marine Organisms (1984 : Marathwada University), eds. Biology of benthic marine organisms: Techniques and methods as applied to the Indian Ocean. Balkema, 1986.

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Breault, Robert F. Estimated sediment thickness, quality, and toxicity to benthic organisms in selected impoundments in Massachusetts. U.S. Geological Survey, 2013.

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Casey, Richard J. Artificial substrata as quantitative sampling devices of benthic macroinvertebrates in flowing water habitats. Alberta Environmental Centre, 1994.

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Mary-Frances, Thompson, Sarojini Rachakonda, Nagabhushanam Rachakonda, and International Conference on the Biology of Benthic Marine Organisms (1984 : Marathwada University), eds. Indian Ocean biology of benthic marine organisms: Techniques and methods as applied to the Indian Ocean. Oxford & IBH Pub. Co., 1986.

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Rheaume, S. J. Benthic invertebrates of benchmark streams in agricultural areas of eastern Wisconsin, Western Lake Michigan Drainages. U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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Rheaume, S. J. Benthic invertebrates of benchmark streams in agricultural areas of eastern Wisconsin, Western Lake Michigan Drainages. U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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Rheaume, S. J. Benthic invertebrates of benchmark streams in agricultural areas of eastern Wisconsin, Western Lake Michigan Drainages. U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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Book chapters on the topic "Benthic organisms"

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Seibold, Eugen, and Wolfgang Berger. "Benthic Organisms and Environmental Reconstruction." In Springer Textbooks in Earth Sciences, Geography and Environment. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51412-3_8.

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Milroy, Scott P. "Census Methods for Benthic Organisms." In Field Methods in Marine Science. Garland Science, 2021. http://dx.doi.org/10.1201/9781317302292-6.

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Reynoldson, Trefor B. "Interactions between sediment contaminants and benthic organisms." In Ecological Effects of In Situ Sediment Contaminants. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4053-6_6.

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Seibold, Eugen, and Wolfgang H. Berger. "Productivity and Benthic Organisms — Distribution, Activity, and Environmental Reconstruction." In The Sea Floor. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-22519-6_7.

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Seibold, Eugen, and Wolfgang H. Berger. "Productivity and Benthic Organisms — Distribution, Activity, and Environmental Reconstruction." In The Sea Floor. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03317-3_7.

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Shigenobu, Yuya, Daisuke Ambe, Hideki Kaeriyama, et al. "Investigation of Radiocesium Translation from Contaminated Sediment to Benthic Organisms." In Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds. Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55537-7_7.

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Thiel, Martin. "Rafting of benthic macrofauna: important factors determining the temporal succession of the assemblage on detached macroalgae." In Migrations and Dispersal of Marine Organisms. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2276-6_7.

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Becerro, Mikel A., María J. Uriz, and Xavier Turon. "Chemically-mediated interactions in benthic organisms: the chemical ecology of Crambe crambe (Porifera, Poecilosclerida)." In Interactions and Adaptation Strategies of Marine Organisms. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-017-1907-0_9.

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de Montaudouin, X., G. Bachelet, and P. G. Sauriau. "Secondary settlement of cockles Cerastoderma edule as a function of current velocity and substratum: a flume study with benthic juveniles." In Migrations and Dispersal of Marine Organisms. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2276-6_12.

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He, Pingping, Xu Zhang, Jinbo Li, Liangliang Xie, and Dawei Tu. "Precision Analysis of the Underwater Laser Scanning System to Measure Benthic Organisms." In Advanced Manufacturing and Automation VIII. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2375-1_41.

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Conference papers on the topic "Benthic organisms"

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Đukić, Dragutin, Leka Mandić, Vesna Đurović, Marijana Pešaković, and Monika Stojanova. "BIOINDICATION ASSESSMENT OF WATER, AIR AND SOIL QUALITY." In 1st International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy, 2023. http://dx.doi.org/10.46793/sbt28.297dj.

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Various bioindicative organisms can be used for rapid assessment of environmental quality. For the bioindicative assessment of air quality lichens are most often used; primarily planktonic microorganisms as well as benthic organisms including macrophytes for water quality; microbiological, enzymatic, lichenological, zoological and phytoindicative methods for quality of soil.
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Holland, A., A. Shaughnessy, and M. Hiegel. "Separation of Long-Term Variation in Benthic Organisms into Major Components." In OCEANS '86. IEEE, 1986. http://dx.doi.org/10.1109/oceans.1986.1160422.

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Ferre, Jordan, Pulkit Singh, and Jonathan Payne. "POST-PALEOZOIC INCREASE IN THE ABUNDANCE OF SKELETAL BENTHIC MARINE ORGANISMS." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-368828.

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Yamamoto, Joji, Yasuharu Nakajima, Hideyuki Oka, and Sotaro Masanobu. "A Numerical Model for Environmental Impact on Marine Organisms for Seafloor Resources Development." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10571.

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The exclusive economic zone (EEZ) of Japan has a very wide area due to a lot of islands in the Japanese Archipelago. Recently, the development of power generation facilities, food production facilities, and the natural resources in the Japanese EEZ are planned. As the worldwide supply and demand of mineral resources are being tight, the technology for effective exploitation and the use of mineral resources in the EEZ will become a key for sustainable development in the Japanese industry. Prior to development of marine mineral resources, it is necessary to evaluate its environmental impact on the water column and seafloor of ocean. However, the environmental evaluation method for open ocean has not been established yet. Then, we are developing the environmental impact prediction model for the seafloor mineral resources development in deep sea area with the consideration of benthic organisms. This model can estimate the impacts of excavating seafloor and sedimentation of particles on marine organisms using an ecosystem model. In addition, the influence of an increase in dissolved oxygen on bacteria caused by the discharging of oxygen-rich waste water at seafloor, is considered in this model. The ecosystem in this model includes benthic organisms, zooplankton, bacteria, particulate organic matter and dissolved oxygen as the components. This paper introduces the calculation case using the prototype model.
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Voloshchuk, Ekaterina, Ekaterina Voloshchuk, Tatjana Eremina, Tatjana Eremina, Alexey Isaev, and Alexey Isaev. "ASSESSMENT OF BIOTURBATION ACTIVITY OF MARENZELLERIA SPP. IN THE EASTERN PART OF THE GULF OF FINLAND." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b947157de15.59935353.

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Macrofauna is supposed to influence on physic-chemical characteristics of the sea bottom sediments. Through its bioturbation mechanism porosity, area of oxygenated layer and oxygen penetration depth have increased. This lead to alterations in nutrient cycling as well as improvement in redox conditions which define direction of fluxes in the sediments. In oxic conditions phosphorus is transformed into particulate form and thus, its retention and burial increase. In contrary, denitrification is getting weaker and nitrogen returns into the water. The impact of benthic organisms bioirrigation activity on other chemical components in solid sediments is not sufficiently studied. Present investigations were carried out for the most abundant benthic species in the Gulf of Finland Marenzelleria spp. Those polychaetes are active turbators and their irrigation effect lead to significant changes in chemical compounds in the solid sediment. On the basis of statistical analysis of data on vertical distribution of organic carbon content, total iron and manganese in solid sediments and abundance of Marenzelleria spp. there was found that polychaetes have a significant impact on organic carbon content, while for total iron and manganese such regularity is not revealed.
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Voloshchuk, Ekaterina, Ekaterina Voloshchuk, Tatjana Eremina, Tatjana Eremina, Alexey Isaev, and Alexey Isaev. "ASSESSMENT OF BIOTURBATION ACTIVITY OF MARENZELLERIA SPP. IN THE EASTERN PART OF THE GULF OF FINLAND." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43155f0cfe.

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Macrofauna is supposed to influence on physic-chemical characteristics of the sea bottom sediments. Through its bioturbation mechanism porosity, area of oxygenated layer and oxygen penetration depth have increased. This lead to alterations in nutrient cycling as well as improvement in redox conditions which define direction of fluxes in the sediments. In oxic conditions phosphorus is transformed into particulate form and thus, its retention and burial increase. In contrary, denitrification is getting weaker and nitrogen returns into the water. The impact of benthic organisms bioirrigation activity on other chemical components in solid sediments is not sufficiently studied. Present investigations were carried out for the most abundant benthic species in the Gulf of Finland Marenzelleria spp. Those polychaetes are active turbators and their irrigation effect lead to significant changes in chemical compounds in the solid sediment. On the basis of statistical analysis of data on vertical distribution of organic carbon content, total iron and manganese in solid sediments and abundance of Marenzelleria spp. there was found that polychaetes have a significant impact on organic carbon content, while for total iron and manganese such regularity is not revealed.
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Soliman, Yousria, Ibrahim Al Ansari, Jose Sericano, and Terry Wade. "Hot Spots for Poly Aromatic Hydrocarbons (PAHs) in Sediments and Benthic Organisms in the Coastal Water of Qatar." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2016. http://dx.doi.org/10.5339/qfarc.2016.eepp2475.

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Al-AShwal, Aisha Ahmed, Noora Al-Naimi, Jassim Al-Khayat, et al. "Distribution and Diversity of Benthic Marine Macroalgae in Islands around Qatar." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0052.

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Extending into the Arabian Gulf, Qatar is surrounded by a number of islands mostly scattered by the eastern coastline. With the unique physical characteristics of the Gulf, which is a highly saline sea with high seawater temperatures, there is an urge need to investigate the macroalgae living in such harsh environment. Macroalgae plays an important role in the food web as they are primary producers and providers of food for other organisms. They also provide shelter and habitat in the marine ecosystem for herbivorous fish and other invertebrate animals. Additionally, macroalgae plays an outstanding role in reducing CO2 from the atmosphere and increasing the level of dissolved oxygen in their immediate environment. However, there are few studies on marine macroalgae in Qatar and no previous studies found related to macroalgae from the islands around Qatar. The present work contributes to the macroalgae research by providing the first survey of distribution and diversity of benthic marine macroalgae in islands around Qatar. The marine benthic green, red and brown macroalgae of intertidal and subtidal in marine zone areas around Qatar were collected during Qatar’s Islands project, which started 2018. The collected macroalgae are documented and a total of 67 species of macroalgae are recorded for all islands around Qatar, 24 Chlorophyta (Green algae), 25 Rhodophyta (Red algae) and 18 species Phaeophyta (Brown algae). The Red algae are dominant taxon in term of species richness, accounting for an average of 37% of the species at all study sites. The islands which had more species are Al-Beshaireya 58 Species, Al-Aaliya 53 Species, Sheraouh 48 Species, Janan 43 Species and Bu Felaita 37 Species. Our results show that islands located at eastern and southeastern coast of Qatar have more diversity of algae species than those located at the western and northwestern coast.
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Kosyan, Alisa, Alisa Kosyan, Vladimir Gulbin, and Vladimir Gulbin. "FIRST CASE OF IMPOSEX IN NEPTUNEA CONVEXA (GASTROPODA: BUCCINIDAE) FROM BATHYAL DEPTHS (SEA OF OKHOTSK, >1400 M)." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93d3467d09.11646865.

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Owing to its worldwide use as an anti-fouling agent, tributyltin (TBT) is a common contaminant of marine ecosystems. Its wide distribution, high hydrophobicity and persistence have raised concern about bioaccumulation, potential biomagnifications in food webs, and adverse effects on the environment and human health. The most frequent and acute effect of TBT is found in gastropods, usually living in shallow waters, rarely at depths more than 100 m. This study reports about the first case of imposex in a deep water buccinid whelk Neptunea convexa collected at 1437 m in the Sea of Okhotsk. Among five collected specimens, the two were imposex females at the 1st stage of imposex development, while the rest three were males with normally developed penises. Most probably, TBT entered the whelk’s body by eaten benthic organisms, which feed on detritus with traces of TBT, but other reasons, such as heavy metal pollution, are also discussed.
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Kosyan, Alisa, Alisa Kosyan, Vladimir Gulbin, and Vladimir Gulbin. "FIRST CASE OF IMPOSEX IN NEPTUNEA CONVEXA (GASTROPODA: BUCCINIDAE) FROM BATHYAL DEPTHS (SEA OF OKHOTSK, >1400 M)." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315a4e465.

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Owing to its worldwide use as an anti-fouling agent, tributyltin (TBT) is a common contaminant of marine ecosystems. Its wide distribution, high hydrophobicity and persistence have raised concern about bioaccumulation, potential biomagnifications in food webs, and adverse effects on the environment and human health. The most frequent and acute effect of TBT is found in gastropods, usually living in shallow waters, rarely at depths more than 100 m. This study reports about the first case of imposex in a deep water buccinid whelk Neptunea convexa collected at 1437 m in the Sea of Okhotsk. Among five collected specimens, the two were imposex females at the 1st stage of imposex development, while the rest three were males with normally developed penises. Most probably, TBT entered the whelk’s body by eaten benthic organisms, which feed on detritus with traces of TBT, but other reasons, such as heavy metal pollution, are also discussed.
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Reports on the topic "Benthic organisms"

1

Mazel, Charles. Coastal Benthic Optical Properties: Optical Properties of Benthic Marine Organisms and Substrates. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada628809.

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2

Mazel, Charles H. Coastal Benthic Optical Properties (CoBOP): Optical Properties of Benthic Marine Organisms and Substrates. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada630466.

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3

Mazel, Charles H. Coastal Benthic Optical Properties (CoBOP): Optical Properties of Benthic Marine Organisms and Substrates. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada622158.

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4

Mazel, Charles. Coastal Benthic Optical Properties (CoBOP): Characteristics and Processes Related to Optical Properties of Benthic Marine Organisms and Substrates. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada630467.

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5

Mazel, Charles. In Situ Spectral Properties (Reflectance and Fluorescence) of Benthic Substrates and Organisms. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada628810.

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6

Schram, Edward, and Pieke Molenaar. Direct mortality among demersal fish and benthic organisms in the wake of pulse trawling. Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/504087.

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Schram, Edward, Pieke Molenaar, and Susan de Koning. Direct mortality among demersal fish and benthic organisms in the wake of pulse trawling. Wageningen Marine Research, 2021. http://dx.doi.org/10.18174/541793.

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8

Lenz, Mark. RV POSEIDON Fahrtbericht / Cruise Report POS536/Leg 1. GEOMAR, 2020. http://dx.doi.org/10.3289/geomar_rep_ns_56_2020.

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DIPLANOAGAP: Distribution of Plastics in the North Atlantic Garbage Patch Ponta Delgada (Portugal) – Malaga (Spain) 17.08. – 12.09.2019 The expedition POS 536 is part of a multi-disciplinary research initiative of GEOMAR investigating the origin, transport and fate of plastic debris from estuaries to the oceanic garbage patches. The main focus will be on the vertical transfer of plastic debris from the surface and near-surface waters to the deep sea and on the processes that mediate this transport. The obtained data will help to develop quantitative models that provide information about the level of plastic pollution in the different compartments of the open ocean (surface, water column, seafloor). Furthermore, the effects of plastic debris on marine organisms in the open ocean will be assessed. The cruise will provide data about the: (1) abundance of plastic debris with a minimum size of 100 μm as well as the composition of polymer types in the water column at different depths from the sea surface to the seafloor including the sediment, (2) abundance and composition of plastic debris in organic aggregates (“marine snow”), (3) in pelagic and benthic organisms (invertebrates and fish) and in fecal pellets, (4) abundance and the identity of biofoulers (bacteria, protozoans and metazoans) on the surface of plastic debris from different water depths, (5) identification of chemical compounds (“additives”) in the plastic debris and in water samples.
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Bridges, Todd, Sandra Newell, Alan Kennedy, et al. Long-term stability and efficacy of historic activated carbon (AC) deployments at diverse freshwater and marine remediation sites. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/38781.

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A number of sites around the United States have used activated carbon (AC) amendments to remedy contaminated sediments. Variation in site-specific characteristics likely influences the long-term fate and efficacy of AC treatment. The long-term effectiveness of an AC amendment to sediment is largely unknown, as the field performance has not been monitored for more than three years. As a consequence, the focus of this research effort was to evaluate AC’s long-term (6–10 yr) performance. These assessments were performed at two pilot-scale demonstration sites, Grasse River, Massena, New York and Canal Creek, Aberdeen Proving Ground (APG), Aberdeen, Maryland, representing two distinct physical environments. Sediment core samples were collected after 6 and 10 years of remedy implementation at APG and Grasse River, respectively. Core samples were collected and sectioned to determine the current vertical distribution and persistence of AC in the field. The concentration profile of polychlorinated biphenyls (PCBs) in sediment pore water with depth was measured using passive sampling. Sediment samples from the untreated and AC-treated zones were also assessed for bioaccumulation in benthic organisms. The data collected enabled comparison of AC distribution, PCB concentrations, and bioaccumulation measured over the short- and long-term (months to years).
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10

Beck, Aaron. RiverOceanPlastic: Land-ocean transfer of plastic debris in the North Atlantic, Cruise No. AL534/2, 05 March – 26 March 2020, Malaga (Spain) – Kiel (Germany). GEOMAR Helmholtz Centre for Ocean Research Kiel, 2020. http://dx.doi.org/10.3289/cr_al534-2.

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Cruise AL534/2 is part of a multi-disciplinary research initiative as part of the JPI Oceans project HOTMIC and sought to investigate the origin, transport and fate of plastic debris from estuaries to the oceanic garbage patches. The main focus of the cruise was on the horizontal transfer of plastic debris from major European rivers into shelf regions and on the processes that mediate this transport. Stations were originally chosen to target the outflows of major European rivers along the western Europe coast between Malaga (Spain) and Kiel (Germany), although some modifications were made in response to inclement weather. In total, 16 stations were sampled along the cruise track. The sampling scheme was similar for most stations, and included: 1) a CTD cast to collect water column salinity and temperature profiles, and discrete samples between surface and seafloor, 2) sediment sampling with Van Veen grab and mini-multi corer (mini-MUC), 3) suspended particle and plankton sampling using a towed Bongo net and vertical WP3 net, and 4) surface neusten sampling using a catamaran trawl. At a subset of stations with deep water, suspended particles were collected using in situ pumps deployed on a cable. During transit between stations, surface water samples were collected from the ship’s underway seawater supply, and during calm weather, floating litter was counted by visual survey teams. The samples and data collected on cruise AL534/2 will be used to determine the: (1) abundance of plastic debris in surface waters, as well as the composition of polymer types, originating in major European estuaries and transported through coastal waters, (2) abundance and composition of microplastics (MP) in the water column at different depths from the sea surface to the seafloor including the sediment, (3) abundance and composition of plastic debris in pelagic and benthic organisms (invertebrates), (4) abundance and identity of biofoulers (bacteria, protozoans and metazoans) on the surface of plastic debris from different water depths, (5) identification of chemical compounds (“additives”) in the plastic debris and in water samples.
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