Academic literature on the topic 'Cave bivalve'

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Journal articles on the topic "Cave bivalve"

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Rassam, Hanane, Soumia Moutaouakil, Hassan Benaissa, Christian Albrecht, and Mohamed Ghamizi. "First record of Pisidium subtruncatum Malm, 1855 (Bivalvia, Sphaeriidae) in an African cave." Subterranean Biology 34 (May 15, 2020): 99–108. http://dx.doi.org/10.3897/subtbiol.34.50916.

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Studies on the bivalve family Sphaeriidae in North Africa are very limited at the surface water level, but even more for caves. During an expedition in 2019 to the Ait M’hamed cave (Oum Er Rabia Basin), six specimens of the genus Pisidium were collected. Morphometric and genetic analyses showed that these individuals belong to the species Pisidium subtruncatum Malm, 1855. This work is the first step towards future exploration of cave Sphaeriidae in North Africa.
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Rassam, Hanane, Soumia Moutaouakil, Hassan Benaissa, Christian Albrecht, and Mohamed Ghamizi. "First record of Pisidium subtruncatum Malm, 1855 (Bivalvia, Sphaeriidae) in an African cave." Subterranean Biology 34 (May 15, 2020): 99–108. https://doi.org/10.3897/subtbiol.34.50916.

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Studies on the bivalve family Sphaeriidae in North Africa are very limited at the surface water level, but even more for caves. During an expedition in 2019 to the Ait M'hamed cave (Oum Er Rabia Basin), six specimens of the genus Pisidium were collected. Morphometric and genetic analyses showed that these individuals belong to the species Pisidium subtruncatum Malm, 1855. This work is the first step towards future exploration of cave Sphaeriidae in North Africa.
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Lukić, Marko, Magdalena Grgić, Tin Rožman, et al. "Culturing cave mollusks in the laboratory: strategies and troubleshooting." ARPHA Conference Abstracts 5 (July 14, 2022): e87764. https://doi.org/10.3897/aca.5.e87764.

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Objective obstacles such as high water levels that prevent access to caves at certain times of the year or the need to use complex tools and skills such as cave diving make biological research in caves extremely complex and occasionally dangerous. Moreover, to study physiological and behavioral adaptations of cave animals, they must be kept under controlled laboratory conditions. For this reason, we have established an animal facility in our laboratory. The available literature on invertebrate setup, operation, and care was sparse and unsuitable for the species we were studying. Fortunately, m
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Orihuela, Johanset, and Adrian Tejedor. "Peter's ghost-faced bat Mormoops megalophylla (Chiroptera: Mormoopidae) from a pre-Columbian archeological deposit in Cuba." Acta Chiropterologica 14, no. 1 (2012): 63–72. https://doi.org/10.5281/zenodo.13457740.

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(Uploaded by Plazi for the Bat Literature Project) Here we report a right dentary of Peter's ghost-faced bat Mormoops megalophylla from an archeological site in northern Matanzas province, western Cuba. The specimen was excavated from a pre-Columbian archeological cave deposit in association with stone tools, bivalve shells, snake and fish vertebrae, and capromyid (rodent) postcranial elements. Although the deposit is not directly dated, the relationship of the assemblage to the time of Amerindian occupation in this cave suggests an age between 1600 and 850 years BP. Therefore, this report may
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Orihuela, Johanset, and Adrian Tejedor. "Peter's ghost-faced bat Mormoops megalophylla (Chiroptera: Mormoopidae) from a pre-Columbian archeological deposit in Cuba." Acta Chiropterologica 14, no. 1 (2012): 63–72. https://doi.org/10.5281/zenodo.13457740.

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(Uploaded by Plazi for the Bat Literature Project) Here we report a right dentary of Peter's ghost-faced bat Mormoops megalophylla from an archeological site in northern Matanzas province, western Cuba. The specimen was excavated from a pre-Columbian archeological cave deposit in association with stone tools, bivalve shells, snake and fish vertebrae, and capromyid (rodent) postcranial elements. Although the deposit is not directly dated, the relationship of the assemblage to the time of Amerindian occupation in this cave suggests an age between 1600 and 850 years BP. Therefore, this report may
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Orihuela, Johanset, and Adrian Tejedor. "Peter's ghost-faced bat Mormoops megalophylla (Chiroptera: Mormoopidae) from a pre-Columbian archeological deposit in Cuba." Acta Chiropterologica 14, no. 1 (2012): 63–72. https://doi.org/10.5281/zenodo.13457740.

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(Uploaded by Plazi for the Bat Literature Project) Here we report a right dentary of Peter's ghost-faced bat Mormoops megalophylla from an archeological site in northern Matanzas province, western Cuba. The specimen was excavated from a pre-Columbian archeological cave deposit in association with stone tools, bivalve shells, snake and fish vertebrae, and capromyid (rodent) postcranial elements. Although the deposit is not directly dated, the relationship of the assemblage to the time of Amerindian occupation in this cave suggests an age between 1600 and 850 years BP. Therefore, this report may
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Orihuela, Johanset, and Adrian Tejedor. "Peter's ghost-faced bat Mormoops megalophylla (Chiroptera: Mormoopidae) from a pre-Columbian archeological deposit in Cuba." Acta Chiropterologica 14, no. 1 (2012): 63–72. https://doi.org/10.5281/zenodo.13457740.

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(Uploaded by Plazi for the Bat Literature Project) Here we report a right dentary of Peter's ghost-faced bat Mormoops megalophylla from an archeological site in northern Matanzas province, western Cuba. The specimen was excavated from a pre-Columbian archeological cave deposit in association with stone tools, bivalve shells, snake and fish vertebrae, and capromyid (rodent) postcranial elements. Although the deposit is not directly dated, the relationship of the assemblage to the time of Amerindian occupation in this cave suggests an age between 1600 and 850 years BP. Therefore, this report may
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8

Orihuela, Johanset, and Adrian Tejedor. "Peter's ghost-faced bat Mormoops megalophylla (Chiroptera: Mormoopidae) from a pre-Columbian archeological deposit in Cuba." Acta Chiropterologica 14, no. 1 (2012): 63–72. https://doi.org/10.5281/zenodo.13457740.

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(Uploaded by Plazi for the Bat Literature Project) Here we report a right dentary of Peter's ghost-faced bat Mormoops megalophylla from an archeological site in northern Matanzas province, western Cuba. The specimen was excavated from a pre-Columbian archeological cave deposit in association with stone tools, bivalve shells, snake and fish vertebrae, and capromyid (rodent) postcranial elements. Although the deposit is not directly dated, the relationship of the assemblage to the time of Amerindian occupation in this cave suggests an age between 1600 and 850 years BP. Therefore, this report may
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Baković, Najla, Ferry Siemensma, Sanja Puljas, et al. "First data on testate amoebae associated with the endemic cave bivalve Congeria jalzici Morton & Bilandžija, 2013 with a description of Psammonobiotus dinarica sp. nov." Subterranean Biology 45 (February 21, 2023): 53–74. https://doi.org/10.3897/subtbiol.45.97105.

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Testate amoebae are phylogenetically a very diverse group of eukaryotic microorganisms. They can be found in marine and freshwater habitats and in soil. Some of these single-celled organisms inhabit both surface and cave habitats, but their diversity in caves has barely been explored. Recent studies in the Dinaric region imply that testate amoebae in caves show a high diversity. The aim of this study was to identify the alpha diversity of testate amoebae in the Lika region (Dinaric karst, Croatia) and to compare the habitats of different caves based on testate amoebae assemblages. In eight cav
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Umami, Rizal, and Agil Al Idrus. "Evidence of The Successful Conservation of Enhalus Acoroides in Terms of The Diversity of Bivalves on The Coast of East Lombok." Jurnal Biologi Tropis 23, no. 2 (2023): 47–54. http://dx.doi.org/10.29303/jbt.v23i2.4320.

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The existence of seagrass in coastal areas can affect marine biota that live around it. Seagrass has an important role as an area of ​​care, spawning, and protection. This study aims to determine the success of conserving seagrass beds of the Enhalus acorodies species in terms of bivalve diversity on the south coast of East Lombok. The research was conducted using transect and observation methods. The data obtained were analyzed using evenness index, diversity index, and species richness. The results of the study found 10 types of Bivalves in Poton Bako. Bivalves diversity index is included in
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Dissertations / Theses on the topic "Cave bivalve"

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De, Villiers Casper Johannes. "Aspects of the biology of the infaunal bivalve Mollusc Solen cylindraceus (Hanley) in the Kariega estuary." Thesis, Rhodes University, 1990. http://hdl.handle.net/10962/d1005321.

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Solen cylindraceus is an infaunal filter-feeding bivalve inhabiting the intertidal mud banks of many southern African estuaries. It is particularly abundant in the Kariega estuary (33°41'S; 26°42'E) where it reaches densities of 400m⁻² (192g shell-free dry wt. m⁻²). The Kariega is a permanently open, marine dominated estuary about 18km in length, and S. cylindraceus is most abundant in its middle and upper reaches. Some physical characteristics of the estuary (temperature, salinity, sediment and water turbidity) are described, and the possible role of these factors in determining the density a
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Grey, Melissa. "Exploring evolutionary patterns and processes : a case study using the Mesozoic bivalve Buchia." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/4654.

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The fossil record is the only direct source of data for studying modes (patterns) and rates of morphological change over geologic time periods. Determining modes is critical for understanding macroevolutionary processes, but just how modes can vary within a taxon, and why, have hitherto been largely understudied. To address this, I examined patterns of morphological change in the shell of the Mesozoic marine bivalve genus Buchia over its geographic and temporal range. Buchia was chosen as a test subject because it is abundant, well-preserved across a variety of facies, and is widely distribute
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Casati, Rafael. "Caracterização tafonômica das concentrações fossilíferas da Formação Cape Melville, Grupo Moby Dick (Mioceno Inferior), Ilha Rei George, Antártica." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/44/44139/tde-19122007-101537/.

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Trabalhos objetivando a tafonomia de concentrações fossilíferas geradas em ambiente glacial ou periglacial são raros. Neste contexto, a presente dissertação realizou a caracterização tafonômica das concentrações fossilíferas da Formação Cape Melville, Grupo Moby Dick (Mioceno Inferior), Ilha Rei George, Antártica, tendo em vista a elucidação da gênese destes depósitos. Para tanto, dados relativos a um total de 534 espécimes foram obtidos nas camadas ricamente fossilíferas das quatro seções, denominadas Pingüineira (PRS), Hard Ground (HGS), Chaminé (CS) e Lava Crag (LCS), levantadas no topo da
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Parolini, M. "CYTO-GENOTOXIC EFFECTS OF SOME PHARMACEUTICAL AND PERSONAL CARE PRODUCTS (PPCPS) ON THE FRESHWATER BIVALVE ZEBRA MUSSEL (DREISSENA POLYMORPHA)." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/150200.

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Pharmaceutical and personal care products (PPCPs) are an emerging class of environmental pollutants that are extensively and increasingly being used in human and veterinary medicine. Due to their continuous production, consumption and often abuse, many studies have shown worldwide measurable concentrations of about 100 of these drugs in the aquatic environment in the high ng L-1 to low µg L-1 range. Among these, antimicrobial, antibiotics and non-steroidal anti-inflammatory drugs (NSAIDs) are three of the most used and frequently detected PPCP classes in aquatic environments. Since these chemi
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ARU, VIOLETTA. "Application of NMR-based metabolomics techniques to biological systems: a case study on bivalves." Doctoral thesis, Università degli Studi di Cagliari, 2016. http://hdl.handle.net/11584/266762.

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In the past years, metabolomics has progressed greatly, providing a reliable and high-throughput approach particularly feasible for the study of complex biological systems. Indeed, thanks to the development of powerful analytical methods capable of screening a large number of chemical compounds in a sample, nowadays metabolomics plays an important role in gaining biological insights toward the influence of internal (genetic and developmental) and external (environmental) factors on phenotypes. The work presented in this Ph.D. thesis shows examples of applications of NMR-based metabolomics to
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Olivier, David William. "The sustainability and employment creation potential of bivalve mariculture: A case study of mussel and oyster farms in Saldanha Bay." Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17914.

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Thesis (MA)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: This study addresses the sustainable development and employment creation potential of bivalve mariculture with reference to the case of Saldanha. The first section of the study looks at various theoretical perspectives relating to sustainable development. The development of modernist theory is presented, as are its shortcomings. The People-Centred Development theory is presented as an alternative theoretical perspective. This theory is relevant to the present study because it prioritises the participation of local individuals in
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Lopes, Joel Martins. "Impacts of pharmaceuticals and personal care products mixtures in marine bivalves." Master's thesis, 2021. http://hdl.handle.net/10773/33452.

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Mixture of contaminants often determine biological responses of marine species, making difficult the interpretation of toxicological data. Among these contaminants are pharmaceuticals and personal care products (PCPs) such as 17 α-ethinylestradiol (EE2) and Sodium Lauryl Sulfate (SLS). Due to their large production and everyday use by the human population, they will eventually enter the marine environment, manly through wastewater. Once in the marine environment EE2 and SLS may interact with organisms and induce toxic effects, in bivalves. Beside contamination, organisms are also exposed
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Batista, Isabel Cristina dos Reis. "Outdoor mass production of marine diatoms for bivalve hatcheries using saline groundwater: a case study in Yerseke (Netherlands) and the improvement of the culture systems in Bouin (France)." Master's thesis, 2007. http://hdl.handle.net/10400.1/545.

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Dissertação de mest., Biologia Marinha, Faculdade de Ciências do Mar e do Ambiente, Universidade do Algarve, 2007<br>The level of the bivalve production in hatcheries and nurseries let to the need to develop a low cost mass microalgae production to be used as food. The saline groundwater has been used successfully as culture medium for marine diatoms, as well as for some fish and crustaceans. The objective of this work was to evaluate in two different sites, at Yerseke and in Bouin, the groundwater quality to be used in diatoms production. At Yerseke the effects of acclimatization and co
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Books on the topic "Cave bivalve"

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Hayami, Itaru. Submarine Cave Bivalvia from the Ryukyu Islands: Systematics and evolutionary significance. University Museum, University of Tokyo, 1993.

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Brumbaugh, Robert D. A practitioners guide to the design & monitoring of shellfish restoration projects: An ecosystem services approach. The Nature Conservancy, 2006.

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Submarine Cave Bivalvia from the Ryukyu Islands. Univ of Tokyo Press, 1994.

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Darrigran, Gustavo, ed. Los moluscos bivalvos. Editorial de la Universidad Nacional de La Plata (EDULP), 2013. http://dx.doi.org/10.35537/10915/32168.

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En este libro se considera a la biodiversidad como la variedad y variabilidad de los seres vivos y de los sistemas ecológicos que ellos integran. Por lo tanto, son tres los componentes de la diversidad biológica organizados en tres niveles: el de las especies (variedad), que son conjuntos de organismos afines capaces de reproducirse entre sí; el de los genes (variabilidad), que constituyen las bases moleculares de la herencia y el de los ecosistemas (sistemas ecológicos), que son complejos funcionales formados por los organismos y el medio físico en el que habitan. Sobre esta base y consideran
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Kase, Tomoki, and Itaru Hayami. Submarine Cave Bivalvia from the Ryukyu Islands: Systematics and Evolutionary Significance. Univ of Tokyo Pr, 1994.

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Fischer, Bob. Arguments for Consuming Animal Products. Edited by Anne Barnhill, Mark Budolfson, and Tyler Doggett. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780199372263.013.11.

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What can be said in favor of consuming animal products? This chapter surveys the options, with special focus on attempts to exploit pro-vegan principles for anti-vegan ends. Utilitarian, rights-based, contractualist, and agrarian proposals are explored, as well as some recent arguments that attempt to revive a form of speciesism. Ultimately, the chapter considers how such arguments might inform a broad case for consuming animal products—that is, one that might earn respect from those in a variety of moral camps—and it suggests that there may be good reasons to eat roadkill, bugs, bivalves, in
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Book chapters on the topic "Cave bivalve"

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Martínez-García, Carolina, Belén González-Fonteboa, Diego Carro-López, Juan Luis Pérez-Ordóñez, and Fernando Martínez-Abella. "Bivalve Shells as a Building Material. A Real Case Application." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2714-2_1.

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Gkikas, Dimitris C., Marios C. Gkikas, and John A. Theodorou. "A Comprehensive Marketing and Diffusion Strategy Protocol for Marine Life Protection, Restoration and Conservation; the Case of Endangered Pinna Nobilis." In Strategic Innovative Marketing and Tourism. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-51038-0_69.

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AbstractThis paper presents a comprehensive marketing and diffusion strategy protocol aimed at protecting, restoring, and conserving marine life populations, with a specific focus on the case of the noble pen shell (fan mussel) Pinna nobilis (P. nobilis). The P. nobilis is a critically endangered species of bivalve mollusk found in the Mediterranean Sea, playing a crucial role in maintaining ecological balance and serving as an indicator of environmental health. The protocol consists of various components designed to maximize impact of the Pinna-SOS project referred to “Innovative Actions for
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morton, Brian. "The evolutionary history of the bivalvia." In Origin and Evolutionary Radiation of the Mollusca. Oxford University PressOxford, 1995. http://dx.doi.org/10.1093/oso/9780198549802.003.0029.

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Abstract The earliest classifications of the Bivalvia, following that of Linnaeus (1758), were produced by conchologists, e.g., Cuvier (1800) and Lamarck (1801) and depended upon shell characters. Cox (1960) has reviewed the history of bivalve taxonomy. In the early part of the 20th century, Paul Pelseneer who had worked up the material for the Siboga and Challenger expeditions began a series of studies on the Bivalvia which resulted in the production of a system of classification based on internal anatomy, notably the ctenidia (Pelseneer, 1906). C.M. Yonge was to use the Pelseneerian system w
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Cherry, Donald, and David Soucek. "Case Study." In Freshwater Bivalve Ecotoxicology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420042856.ch11.

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H. Van Hassel, John. "Case Study." In Freshwater Bivalve Ecotoxicology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420042856.ch12.

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H. Van Hassel, John, Heidi Dunn, and Jerry Farris. "Case Study." In Freshwater Bivalve Ecotoxicology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420042856.ch13.

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Schmerfeld, John, Theodore Valenti, Richard Neves, and Brandon Locke. "Case Study." In Freshwater Bivalve Ecotoxicology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420042856.ch14.

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Chintiroglou, Chariton-Charles, and Chryssanthi Antoniadou. "Infections of bivalves by microsporidia: The case of Steinhausia species." In Diseases of Bivalves. Elsevier, 2025. http://dx.doi.org/10.1016/b978-0-12-820339-2.00008-5.

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Shi, Wei, and Guangxu Liu. "Toxicological impacts of personal care products on marine bivalves." In Marine Bivalve Mollusks and Emerging Pollutants. Elsevier, 2024. http://dx.doi.org/10.1016/b978-0-443-19117-6.00010-6.

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Bagheri, Siamak, Mohammad Sayad Bourani, Azemat Dadai Ghandi, and Foong Swee Yeok. "Impact of Fish Cage Culture (Rainbow Trout, Oncorhynchus mykiss) on Zooplankton Structure in Iranian Water of the Caspian Sea." In Iconic Marine Vertebrates - Recent Advances, New Perspectives and Applications for ‎Conservation [Working Title]. IntechOpen, 2024. https://doi.org/10.5772/intechopen.1007414.

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The Caspian Sea has undergone tremendous changes due mainly to anthropogenic influences. From the 2013 record (January and April), studies were done in the southwestern Caspian Sea (off Jefrud), to gauge the impacts of fish cage culture on the zooplankton community. Scientists found a total of 12 species of zooplankton, belonging to 9 taxa at the study sites. As compared to the 1996–1997 records that marked a total of seven Copepode species at the same study area, only one species was recorded in 2013. The same applied to Cladocera, with only Pleopis polyphemoides documented in 2013. Acartia t
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Conference papers on the topic "Cave bivalve"

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Itoh, Shigeru. "Shock Wave and Biotechnology." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1972.

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In order to clarify relation between chemical character and physical power, the test of shock wave loading for a living thing was carried out. In case of foraminifera, breeding from a fragment was confirmed in the observation test, after shock wave loading. And, as for the bivalve, the shell was very easy separated from organics. In the experiment of the underwater shock wave loading to a wood, alternative destruction of pit membrane realized improvement in moisture permeability. Furthermore, when the super-criticality disassembly experiment was conducted using the wood after shock wave load,
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Sexton, Brennen. "BREAKING BIVALVES: A CASE STUDY ON THE PRESERVATION OF SEAGRASS MOLLUSKS." In GSA Connects 2024 Meeting in Anaheim, California. Geological Society of America, 2024. http://dx.doi.org/10.1130/abs/2024am-402310.

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Munjiu, Oxana. "Macronevertebratele bentonice din sectorul inferior al râului Prut, Republica Moldova." In Starea ecosistemelor acvatice transfrontaliere ale Republicii Moldova. Institute of Zoology, 2025. https://doi.org/10.53937/sea2024.12.

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În lucrare sunt prezentate date privind densitatea, biomasa și diversitatea macrobentosului pe cursul Prutului Inferior și în lacul Beleu în anii 2023-2024. A fost observată pentru prima dată prezența speciilor Hirudo medicinalis Linnaeus, 1758 și Sympecma fusca (Vander Linden, 1820) în lacul Beleu. Au fost identificați în total 132 de taxoni de nevertebrate bentonice, dintre care: Gastropoda – 12, Bivalvia – 8, Annelida – 20, Crustacea – 11, Ephemeroptera – 7, Odonata – 8, Trichoptera – 6, Chironomidae – 33 și alte grupe – 27. Au fost calculați indicii de biodiversitate Shannon și Simpson și
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Khurshid, Benazir, Jonathan Perrin, Frédéric Marin, Mathieu Thoury, Cedric Broussard, and Daniel Jackson. "ORGANIC/INORGANIC INTERFACES IN CALCIUM CARBONATE BIOMINERALS: THE CASE OF PINNA NOBILIS SHELL (BIVALVIA, PTERIOMORPHIA)." In Goldschmidt2021. European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6851.

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Epa, Yuwan Ranjeev, Roger W. Portell, and John Warren Huntley. "IS THERE A LINK BETWEEN PARASITISM, KLEPTOPARASITISM, AND PREDATION IN MARINE BIVALVES? A CASE STUDY FROM THE PLIO-PLEISTOCENE OF NORTHEASTERN FLORIDA." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-317505.

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Jiménez-Melero, R., J. D. Gilbert, G. Parra, F. J. Márquez, and F. J. Pérez-Latorre. "Primera aproximación al grado de colonización de las balsas de riego por comunidades zooplanctónicas en la provincia de Jaén." In XXXIX Congreso Nacional de Riegos (Úbeda, Jaén). AERYD / Universidad de Jaén, 2024. https://doi.org/10.17561/xxxix_cnr.pc01.

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Actualmente se está produciendo una drástica desaparición de los humedales mediterráneos, debido principalmente al cambio climático, junto con los cambios en los usos del suelo. En este escenario, las balsas de riego se han convertido en un refugio de diversidad que alberga desde pequeños crustáceos planctónicos hasta avifauna acuática y anfibios. Sin embargo, algunos de estos pequeños organismos pueden proliferar enormemente causando problemas de obstrucción en filtros y otras infraestructuras del sistema de riego. A este problema se le suman las cada vez más frecuentes invasiones biológicas
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Reports on the topic "Cave bivalve"

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Chriscoe, Mackenzie, Rowan Lockwood, Justin Tweet, and Vincent Santucci. Colonial National Historical Park: Paleontological resource inventory (public version). National Park Service, 2022. http://dx.doi.org/10.36967/nrr-2291851.

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Colonial National Historical Park (COLO) in eastern Virginia was established for its historical significance, but significant paleontological resources are also found within its boundaries. The bluffs around Yorktown are composed of sedimentary rocks and deposits of the Yorktown Formation, a marine unit deposited approximately 4.9 to 2.8 million years ago. When the Yorktown Formation was being deposited, the shallow seas were populated by many species of invertebrates, vertebrates, and micro-organisms which have left body fossils and trace fossils behind. Corals, bryozoans, bivalves, gastropod
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Tweet, Justin, Holley Flora, Summer Weeks, Eathan McIntyre, and Vincent Santucci. Grand Canyon-Parashant National Monument: Paleontological resource inventory (public version). National Park Service, 2021. http://dx.doi.org/10.36967/nrr-2289972.

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Abstract:
Grand Canyon-Parashant National Monument (PARA) in northwestern Arizona has significant paleontological resources, which are recognized in the establishing presidential proclamation. Because of the challenges of working in this remote area, there has been little documentation of these resources over the years. PARA also has an unusual management situation which complicates resource management. The majority of PARA is administered by the Bureau of Land Management (BLM; this land is described here as PARA-BLM), while about 20% of the monument is administered by the National Park Service (NPS; th
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