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Journal articles on the topic 'Spatial distribution of trophic resources'

Author: Grafiati

Published: 21 January 2023

Last updated: 31 July 2025

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1

Garrison, Lance P. "Spatial and dietary overlap in the Georges Bank groundfish community." Canadian Journal of Fisheries and Aquatic Sciences 57, no. 8 (2000): 1679–91. http://dx.doi.org/10.1139/f00-117.

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Patterns in spatial and trophic resource partitioning in the fish community of the Georges Bank region are identified, accounting for size-based changes in diets. During autumn and spring, this community is divided into geographic assemblages of species that have high spatial overlap. Similarity in spatial distribution is primarily related to similarity in depth preferences, and seasonal differences in species composition within assemblages are related to migrations. There is also important trophic structure within the Georges Bank community separating predators based upon prey size and locati

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2

Sampaio, Ana Lúcia A., João Paulo A. Pagotto, and Erivelto Goulart. "Relationships between morphology, diet and spatial distribution: testing the effects of intra and interspecific morphological variations on the patterns of resource use in two Neotropical Cichlids." Neotropical Ichthyology 11, no. 2 (2013): 351–60. http://dx.doi.org/10.1590/s1679-62252013005000001.

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Considering th e morphology, diet and spatial distribution of Satanoperca pappaterraand Crenicichla britskii (Perciformes: Cichlidae) in the Upper Paraná River floodplain (Brazil), the following questions were investigated: (1) Could the body shape predict the use of trophic resources and habitat by C. britskiiand S. pappaterra? (2) Could the relationship between morphology and use of trophic resources and habitat be also extended to the intraspecific scale? (3) What are the most important morphological traits used to predict the variation on diet and habitat occupation within and between spec

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Bellardini, Daniele, Jessica Vannini, Luca Russo, et al. "The Spatial Distribution of Copepod Functional Traits in a Highly Anthropized Mediterranean Coastal Marine Region." Environments 11, no. 6 (2024): 113. http://dx.doi.org/10.3390/environments11060113.

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Copepods dominate marine zooplankton in abundance and play key roles in pelagic food webs. These small crustaceans show high taxonomic and functional diversity. Although there has been considerable research on their taxonomy, only a few studies have focused on their functional traits. In this study, we analyzed the functional traits of 95 copepod species, considering their body size, trophic regime, feeding behavior, and spawning strategy. Based on samples collected during two surveys (autumn 2020 and summer 2021) located in the coastal waters of three gulfs (Gaeta, Naples, and Salerno) in the

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Benoit-Bird, Kelly J., and Margaret A. McManus. "Bottom-up regulation of a pelagic community through spatial aggregations." Biology Letters 8, no. 5 (2012): 813–16. http://dx.doi.org/10.1098/rsbl.2012.0232.

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The importance of spatial pattern in ecosystems has long been recognized. However, incorporating patchiness into our understanding of forces regulating ecosystems has proved challenging. We used a combination of continuously sampling moored sensors, complemented by shipboard sampling, to measure the temporal variation, abundance and vertical distribution of four trophic levels in Hawaii's near shore pelagic ecosystem. Using an analysis approach from trophic dynamics, we found that the frequency and intensity of spatial aggregations—rather than total biomass—in each step of a food chain involvi

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Puerta, Patricia, Mary E. Hunsicker, Manuel Hidalgo, et al. "Community–environment interactions explain octopus-catshark spatial overlap." ICES Journal of Marine Science 73, no. 7 (2016): 1901–11. http://dx.doi.org/10.1093/icesjms/fsw053.

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Abstract The octopus Eledone cirrhosa and the catshark Scyliorhinus canicula present the same feeding habits and distributional preferences in the Mediterranean Sea. We explore patterns of spatial overlap between these species to address coexistence and infer possible competition from spatial patterns in the western Mediterranean Sea. A spatially explicit modelling approach revealed that spatial overlap mainly responded to the distribution of shared resources, where coexistence is allowed by different ecological processes. Catshark (k-strategy) was highly abundant and widely distributed. Howev

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Siqueira, Alexandre C., Renato A. Morais, David R. Bellwood, and Peter F. Cowman. "Planktivores as trophic drivers of global coral reef fish diversity patterns." Proceedings of the National Academy of Sciences 118, no. 9 (2021): e2019404118. http://dx.doi.org/10.1073/pnas.2019404118.

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One of the most prominent features of life on Earth is the uneven number of species across large spatial scales. Despite being inherently linked to energetic constraints, these gradients in species richness distribution have rarely been examined from a trophic perspective. Here we dissect the global diversity of over 3,600 coral reef fishes to reveal patterns across major trophic groups. By analyzing multiple nested spatial scales, we show that planktivores contribute disproportionally to the formation of the Indo-Australian Archipelago (IAA) marine biodiversity hotspot. Besides being “hotter”

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7

Liao, Chenmei, Yifan Zuo, Rob Law, Yingying Wang, and Mu Zhang. "Spatial Differentiation, Influencing Factors, and Development Paths of Rural Tourism Resources in Guangdong Province." Land 11, no. 11 (2022): 2046. http://dx.doi.org/10.3390/land11112046.

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Rural tourism resources are the core carriers of rural tourism. It is, therefore, beneficial to further optimize the layout of rural tourism and to explore the spatial differentiation of rural tourism resources and their influencing factors. Taking 4670 rural tourism resources in Guangdong Province in China as the research object, this study explores the spatial distribution patterns of rural tourism resources through the nearest neighbor index, grid dimension analysis, kernel density analysis, and standard deviation ellipse method. Geodetectors are used to identify the influencing factors of

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8

Ursenbacher, Sylvain, Philippe Christe, and César Metzger. "Testing the competitive exclusion principle using various niche parameters in a native (Natrix maura) and an introduced (N. tessellata) colubrid." Amphibia-Reptilia 30, no. 4 (2009): 523–31. http://dx.doi.org/10.1163/156853809789647031.

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AbstractDespite the increase of animal and plant introductions worldwide and the strong augmentation of the reptile trade, few invasive snake populations have been studied. Dice snakes (Natrix tessellata) were introduced to the shores of Lake Geneva (Switzerland) in the early 1920s, and are now well established. This region of introduction was previously inhabited by Viperine snakes (N. maura). Ever since these two species have been under monitoring (which began in 1996) the Viperine snake population has shown drastic decline. We examine here the possibility of trophic competition by analysing

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9

Codron, Jacqueline, Kevin J. Duffy, Nico L. Avenant, et al. "Stable isotope evidence for trophic niche partitioning in a South African savanna rodent community." Current Zoology 61, no. 3 (2015): 397–411. http://dx.doi.org/10.1093/czoolo/61.3.397.

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Abstract Species’ partitioning of resources remains one of the most integral components for understanding community assembly. Analysis of stable carbon and nitrogen isotopes in animal tissues has the potential to help resolve patterns of partitioning because these proxies represent the individual’s diet and trophic niche, respectively. Using free-ranging rodents in a southern African savanna as a model community, we find that syntopic species within habitats occupy distinct isotope niches. Moreover, species with strongly overlapping isotope niches did not overlap in their spatial distribution

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Santamaría, Silvia, Camilla Aviaaja Enoksen, Jens M. Olesen, et al. "Diet composition of the lizard Podarcis lilfordi (Lacertidae) on 2 small islands: an individual-resource network approach." Current Zoology 66, no. 1 (2019): 39–49. http://dx.doi.org/10.1093/cz/zoz028.

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Abstract Despite it is widely accepted that intrapopulation variation is fundamental to ecological and evolutionary processes, this level of information has only recently been included into network analysis of species/population interactions. When done, it has revealed non-random patterns in the distribution of trophic resources. Nestedness in resource use among individuals is the most recurrent observed pattern, often accompanied by an absence of modularity, but no previous studies examine bipartite modularity. We use network analysis to describe the diet composition of the Balearic endemic l

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Chukwuka, Azubuike Victor, Adedeji Hameed Adebowale, and Oloyede Adeyemi Adekolurejo. "Morphological Differences and Trophic Niche Breadth of Sarotherodon galilaeus and Oreochromis niloticus from the Freshwater Lake Geriyo, North-Eastern Nigeria." Croatian Journal of Fisheries 77, no. 1 (2019): 19–32. http://dx.doi.org/10.2478/cjf-2019-0003.

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Abstract The relationship between morphological traits and feeding ecology of the only two tilapiine cichlids (Sarotherodon galilaeus and Oreochromis niloticus) in Lake Geriyo, northeastern Nigeria, was examined. Stomach contents of 504 individuals were examined and analyzed to relate morphological differences of each species to its dietary preferences. Eleven ecological relevant morphological variables, including total length, standard length, head length, body depth, eye diameter, pectoral spine length, pelvic spine length, dorsal fin ray count, dorsal spine count and anal fin ray count, wer

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Almeida, Nathalie, Jaime A. Ramos, Isabel Rodrigues, et al. "Year-round at-sea distribution and trophic resources partitioning between two sympatric Sulids in the tropical Atlantic." PLOS ONE 16, no. 6 (2021): e0253095. http://dx.doi.org/10.1371/journal.pone.0253095.

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In the oligotrophic tropical marine environment resources are usually more patchily distributed and less abundant to top predators. Thus, spatial and trophic competition can emerge, especially between related seabird species belonging to the same ecological guild. Here we studied the foraging ecology of two sympatric species–brown booby (BRBO) Sula leucogaster (breeding) and red-footed boobies (RFBO) Sula sula (non-breeding)–at Raso islet (Cabo Verde), across different seasons. Sexual segregation was only observed during Jun-Oct, when RFBO were present, with larger females BRBO remaining close

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Yang, Xiaodong, Konglan Luo, Jiawei Fu, Bin Kang, Xiongbo He, and Yunrong Yan. "Fish Community Resource Utilization Reveals Benthic–Pelagic Trophic Coupling Along Depth Gradients in the Beibu Gulf, South China Sea." Biology 14, no. 2 (2025): 207. https://doi.org/10.3390/biology14020207.

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Benthic–pelagic coupling is a key approach to studying the structure and energy dynamics of shallow marine food webs. The movement and foraging patterns of consumers are major drivers of nutrient and energy distribution in ecosystems and are critical for maintaining ecosystem stability. To better understand the energy coupling of consumers between coastal marine habitats, this study employed a Bayesian mixture model using SC and SI data. By classifying functional groups based on taxonomy, morphological traits, and feeding ecology similarities, we constructed a trophic network and analyzed the

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14

Mario Arthur Favretto, Elton Orlandin, Emili Bortolon dos Santos, and Osvaldo Onghero-Junior. "Functional feeding groups and spatial variation of aquatic insects in a hydrographic basin of Southern Brazil." Acta Biológica Catarinense 5, no. 3 (2018): 50–64. http://dx.doi.org/10.21726/abc.v5i3.406.

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In Brazil, river basins are geographic units used for environmental and water resources management. Few studies focus on the variation of biodiversity in these units. We present the results on the spatial variation of aquatic insects in streams of the catchment area of Peixe River, southern Brazil. The insect composition was analyzed for relative abundance of families, functional trophic group and environmental assessment indices. The insects had a heterogeneous distribution among the sample areas of the basin. The most abundant families were Hydropsychidae, Philopotamidae and Leptophlebiidae,

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Favretto, Mario Arthur, Elton Orlandin, Emili Bortolon Dos Santos, and Osvaldo Onghero-Jr. "Functional trophic groups and spatial variation of aquatic insects in a hydrographic basin of Southern Brazil." Acta Biológica Catarinense 5, no. 3 (2018): 50. http://dx.doi.org/10.21726/abc.v5i3.447.

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In Brazil hydrographic basins are geographical unities used to environmental and hydric resources management, but few studies focus in the biodiversity variation within these unities. Here we present the results of spatial variation of aquatic insects in streams of a hydrographic basin in Southern Brazil. The insect composition was analyzed in relation to abundance of the families, functional trophic group and environmental evaluation indexes proposed by literature. The insects had a heterogeneous distribution in the sampling areas of the hydrographic basin. The most abundant families were Hyd

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Smith, Joshua G., Joseph Tomoleoni, Michelle Staedler, Sophia Lyon, Jessica Fujii, and M. Tim Tinker. "Behavioral responses across a mosaic of ecosystem states restructure a sea otter–urchin trophic cascade." Proceedings of the National Academy of Sciences 118, no. 11 (2021): e2012493118. http://dx.doi.org/10.1073/pnas.2012493118.

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Consumer and predator foraging behavior can impart profound trait-mediated constraints on community regulation that scale up to influence the structure and stability of ecosystems. Here, we demonstrate how the behavioral response of an apex predator to changes in prey behavior and condition can dramatically alter the role and relative contribution of top-down forcing, depending on the spatial organization of ecosystem states. In 2014, a rapid and dramatic decline in the abundance of a mesopredator (Pycnopodia helianthoides) and primary producer (Macrocystis pyrifera) coincided with a fundament

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17

Xu, Minghao, Xiaodi Gao, Weicheng Liu, and Jiaqi Wang. "Seasonal Distribution of Key Small-Sized Fish in the South Inshore of Zhejiang, China." Fishes 9, no. 10 (2024): 412. http://dx.doi.org/10.3390/fishes9100412.

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Small-sized fish are a vital food source for large predatory commercial fish and play a key role in marine food webs, bridging lower and higher trophic levels. They are indispensable in maintaining the energy flow and material cycling within aquatic ecosystems. This study utilized bottom-trawl survey data from 2017 to 2020 along the south inshore of Zhejiang, China, complemented by concurrent environmental data, to examine the influence of environmental factors on the resource density and seasonal distribution patterns of four dominant small-sized fish species. The research findings indicated

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Flores-Ortega, Juan R., Enrique Godínez-Domínguez, Gaspar González-Sansón, Jorge A. Rojo-Vázquez, Antonio C. López-Prado, and María Y. Morales-Jauregui. "Abundance, distribution, feeding habits and trophic interactions in five flatfish species (Pleuronectiformes) in the Mexican central Pacific." Latin American Journal of Aquatic Research 41, no. 3 (2017): 423–39. http://dx.doi.org/10.3856/vol41-issue3-fulltext-6.

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We analyzed the spatial distribution patterns of the five most abundant flatfish species caught by shrimp trawl nets on the continental shelf of the Mexican central Pacific. Food diets and trophic interactions between of the flatfish species are described as well. Flatfishes are distributed between 20 and 60 m depth. Bothus leopardinus showed the greatest abundance during the cold season (January-May), the other species did not show significant differences between seasons (cold and warm). The diet of the flatfish species consist of crustaceans, fishes and cephalopods. B. leopardinus and Syaciu

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19

Abrahms, Briana, Kylie L. Scales, Elliott L. Hazen, et al. "Mesoscale activity facilitates energy gain in a top predator." Proceedings of the Royal Society B: Biological Sciences 285, no. 1885 (2018): 20181101. http://dx.doi.org/10.1098/rspb.2018.1101.

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How animal movement decisions interact with the distribution of resources to shape individual performance is a key question in ecology. However, links between spatial and behavioural ecology and fitness consequences are poorly understood because the outcomes of individual resource selection decisions, such as energy intake, are rarely measured. In the open ocean, mesoscale features (approx. 10–100 km) such as fronts and eddies can aggregate prey and thereby drive the distribution of foraging vertebrates through bottom-up biophysical coupling. These productive features are known to attract pred

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Muto, Elizabeti Y., Thaïs Navajas Corbisier, Leandro Inoe Coelho, Lidia Paes Leme Arantes, André Chalom, and Lucy Satiko Hashimoto Soares. "Trophic Groups Of Demersal Fish Of Santos Bay And Adjacent Continental Shelf, São Paulo State, Brazil: Temporal And Spatial Comparisons." Brazilian Journal of Oceanography 62, no. 2 (2014): 89–102. http://dx.doi.org/10.1590/s1679-87592014045906202.

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The temporal and spatial variations of feeding habits and trophic groups of demersal fish species of Santos Bay and the adjacent continental shelf were investigated. The samples were taken in September 2005 and March 2006 by bottom otter trawling. The stomach content analysis of 2,328 specimens of 49 species showed most fish fed on a large range of food items but relied heavily on shrimp, crabs/swimming-crabs, amphipods, mysids, polychaetes, ophiuroids, squids, and teleosteans. The species were classified into ten trophic groups. Shrimp were an important food source in the Santos bay and inner

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McBride, MM, O. Schram Stokke, AHH Renner, et al. "Antarctic krill Euphausia superba: spatial distribution, abundance, and management of fisheries in a changing climate." Marine Ecology Progress Series 668 (June 24, 2021): 185–214. http://dx.doi.org/10.3354/meps13705.

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Antarctic krill Euphausia superba, a keystone species in the Southern Ocean, is highly relevant for studying effects of climate-related shifts on management systems. Krill provides a key link between primary producers and higher trophic levels and supports the largest regional fishery. Any major perturbation in the krill population would have severe ecological and economic ramifications. We review the literature to determine how climate change, in concert with other environmental changes, alters krill habitat, affects spatial distribution/abundance, and impacts fisheries management. Findings r

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Doong, Marielle Kristine, Jonathan Anticamara, and Francis Magbanua. "Spatial Variations in the Distribution of Benthic Macroinvertebrate Functional Feeding Groups in Tropical Rivers." Indonesian Journal of Limnology 2, no. 1 (2021): 35–52. http://dx.doi.org/10.51264/inajl.v2i1.11.

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Functional feeding group (FFG) is an approach that classifies macroinvertebrates based on their utilization of organic matter food resources. Across streams and rivers, variations in the distribution of FFGs reflect the unequal distribution of food resources, which are affected by varying environmental conditions and disturbances to the ecosystem. In the tropics, the distribution of FFGs does not follow the pattern observed in temperate streams. This study aims to (1) determine the FFGs present in selected Philippine tropical streams, (2) assess the variations in FFG distributions and how the

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Polunina, Ju Ju, E. K. Lange, and V. A. Krechik. "The structure and distribution of autumnal zooplankton in the South-Eastern part of the Baltic sea in 2015." Океанология 59, no. 1 (2019): 72–81. http://dx.doi.org/10.31857/s0030-157459172-81.

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Were found peculiarities of the structure and distribution in the autumn plankton of the South -Eastern part of the Baltic sea (SEB) in October 2015 taking into account hydrological and hydrochemical data. There were no changes registered as to the taxonomic composition of phyto- and zooplankton, including no increase in the number of the stenothermic and stenohaline species, as well as no significant differences in the hydrological parameters in comparison with the long-term analogous data. Thus, there was no influence of the winter Major Baltic Inflow in December 2014 on the plankton SEB nex

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Recalde, Fátima C., Crasso P.B. Breviglieri, Mônica F. Kersch-Becker, and Gustavo Q. Romero. "Contribution of emergent aquatic insects to the trophic variation of tropical birds and bats." Food Webs 29 (June 12, 2021): e00209. https://doi.org/10.5281/zenodo.13433844.

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(Uploaded by Plazi for the Bat Literature Project) Food webs are spatially connected by cross-ecosystem fluxes of resources, especially in aquatic-terrestrial boundaries. Generalist consumers are often supported by allochthonous resources, which can influence their density, biomass, and distribution. In this study, we investigated the influence of allochthonous aquatic resources on the foraging activity of bats (by ultrasound emissions) and richness of birds (by birdsong records). We also used stable isotope analysis of δ13C and δ15N to determine their diet and trophic space using bayesian Sta

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Recalde, Fátima C., Crasso P.B. Breviglieri, Mônica F. Kersch-Becker, and Gustavo Q. Romero. "Contribution of emergent aquatic insects to the trophic variation of tropical birds and bats." Food Webs 29 (June 7, 2021): e00209. https://doi.org/10.5281/zenodo.13433844.

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(Uploaded by Plazi for the Bat Literature Project) Food webs are spatially connected by cross-ecosystem fluxes of resources, especially in aquatic-terrestrial boundaries. Generalist consumers are often supported by allochthonous resources, which can influence their density, biomass, and distribution. In this study, we investigated the influence of allochthonous aquatic resources on the foraging activity of bats (by ultrasound emissions) and richness of birds (by birdsong records). We also used stable isotope analysis of δ13C and δ15N to determine their diet and trophic space using bayesian Sta

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Recalde, Fátima C., Crasso P.B. Breviglieri, Mônica F. Kersch-Becker, and Gustavo Q. Romero. "Contribution of emergent aquatic insects to the trophic variation of tropical birds and bats." Food Webs 29 (July 3, 2021): e00209. https://doi.org/10.5281/zenodo.13433844.

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(Uploaded by Plazi for the Bat Literature Project) Food webs are spatially connected by cross-ecosystem fluxes of resources, especially in aquatic-terrestrial boundaries. Generalist consumers are often supported by allochthonous resources, which can influence their density, biomass, and distribution. In this study, we investigated the influence of allochthonous aquatic resources on the foraging activity of bats (by ultrasound emissions) and richness of birds (by birdsong records). We also used stable isotope analysis of δ13C and δ15N to determine their diet and trophic space using bayesian Sta

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Recalde, Fátima C., Crasso P.B. Breviglieri, Mônica F. Kersch-Becker, and Gustavo Q. Romero. "Contribution of emergent aquatic insects to the trophic variation of tropical birds and bats." Food Webs 29 (July 10, 2021): e00209. https://doi.org/10.5281/zenodo.13433844.

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(Uploaded by Plazi for the Bat Literature Project) Food webs are spatially connected by cross-ecosystem fluxes of resources, especially in aquatic-terrestrial boundaries. Generalist consumers are often supported by allochthonous resources, which can influence their density, biomass, and distribution. In this study, we investigated the influence of allochthonous aquatic resources on the foraging activity of bats (by ultrasound emissions) and richness of birds (by birdsong records). We also used stable isotope analysis of δ13C and δ15N to determine their diet and trophic space using bayesian Sta

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Recalde, Fátima C., Crasso P.B. Breviglieri, Mônica F. Kersch-Becker, and Gustavo Q. Romero. "Contribution of emergent aquatic insects to the trophic variation of tropical birds and bats." Food Webs 29 (July 17, 2021): e00209. https://doi.org/10.5281/zenodo.13433844.

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(Uploaded by Plazi for the Bat Literature Project) Food webs are spatially connected by cross-ecosystem fluxes of resources, especially in aquatic-terrestrial boundaries. Generalist consumers are often supported by allochthonous resources, which can influence their density, biomass, and distribution. In this study, we investigated the influence of allochthonous aquatic resources on the foraging activity of bats (by ultrasound emissions) and richness of birds (by birdsong records). We also used stable isotope analysis of δ13C and δ15N to determine their diet and trophic space using bayesian Sta

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Poulsen, Bent Otto. "A comparison of bird richness, abundance and trophic organization in forests of Ecuador and Denmark: are high-altitude Andean forests temperate or tropical?" Journal of Tropical Ecology 18, no. 4 (2002): 615–36. http://dx.doi.org/10.1017/s0266467402002407.

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The fact that certain climatic variables are similar in high-latitude temperate zones and at high-altitude sites in the tropics, has led to assumptions about ecologically equivalent situations. The altitudinal differences between two data sets obtained in forests in temperate Denmark at sea level and in tropical Ecuador at 3000–3350 m above sea level provided a comparison suitable for examining whether high-altitude Andean forests are temperate or tropical from the standpoint of avian richness, abundance and trophic organization. Sampling methods at the two locations were similar. The Ecuadori

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Alexander, Timothy J., Pascal Vonlanthen, and Ole Seehausen. "Does eutrophication-driven evolution change aquatic ecosystems?" Philosophical Transactions of the Royal Society B: Biological Sciences 372, no. 1712 (2017): 20160041. http://dx.doi.org/10.1098/rstb.2016.0041.

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Eutrophication increases primary production and changes the relative abundance, taxonomic composition and spatial distribution of primary producers within an aquatic ecosystem. The changes in composition and location of resources alter the distribution and flow of energy and biomass throughout the food web. Changes in productivity also alter the physico-chemical environment, which has further effects on the biota. Such ecological changes influence the direction and strength of natural and sexual selection experienced by populations. Besides altering selection, they can also erode the habitat g

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Mustamäki, Noora, Henri Jokinen, Matias Scheinin, Erik Bonsdorff, and Johanna Mattila. "Seasonal shifts in the vertical distribution of fish in a shallow coastal area." ICES Journal of Marine Science 73, no. 9 (2016): 2278–87. http://dx.doi.org/10.1093/icesjms/fsw038.

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Abstract Depth structures aquatic habitats, creating substantial differences in the species composition of underwater communities even at small intervals. Those communities also undergo considerable cyclic variation annually. In this study, we surveyed variation in the vertical distribution of fish in a shallow (20 m) coastal basin in the northern Baltic Sea during the ice-free period from May to October. The waters were strongly mixed throughout the season and only transient signs of stratification were observed. As production shifted towards higher trophic levels over summer, with sequential

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Tsybulin, Vyacheslav, Toan Dang Ha, and Pavel Zelenchuk. "Nonlinear dynamics of the predator – prey system in a heterogeneous habitat and scenarios of local interaction of species." Izvestiya VUZ. Applied Nonlinear Dynamics 29, no. 5 (2021): 751–64. http://dx.doi.org/10.18500/0869-6632-2021-29-5-751-764.

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The purpose of this work is to study the influence of various local models in the equations of diffusion–advection– reaction on the spatial processes of coexistence of predators and prey under conditions of a nonuniform distribution of the carrying capacity. We consider a system of nonlinear parabolic equations to describe diffusion, taxis, and local interaction of a predator and prey in a one-dimensional habitat. Methods. We carried out the study of the system using the dynamical systems approach and a computational experiment based on the method of lines and a scheme of staggered grids. Resu

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Möller, Klas O., John Michael Saint, Axel Temming, et al. "Marine snow, zooplankton and thin layers:indications of a trophic link from small-scale sampling with the Video Plankton Recorder." Marine ecology progress series 468 (November 14, 2012): 57–69. https://doi.org/10.3354/meps09984.

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Marine aggregates of biogenic origin, known as marine snow, are considered to play a major role in the ocean's particle flux and may represent a concentrated food source for zooplankton. However, observing the marine snow-zooplankton interaction in the field is difficult since conventional net sampling does not collect marine snow quantitatively and cannot resolve so-called thin layers in which this interaction occurs. Hence, field evidence for the importance of the marine snow-zooplankton link is scarce. Here we employed a Video Plankton Recorder (VPR)to quantify small-scale (metres) vertical

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Rodrigues, C. F., A. Hilário, and M. R. Cunha. "Chemosymbiotic species from the Gulf of Cadiz (NE Atlantic): distribution, life styles and nutritional patterns." Biogeosciences 10, no. 4 (2013): 2569–81. http://dx.doi.org/10.5194/bg-10-2569-2013.

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Abstract. Previous work in the mud volcanoes from the Gulf of Cadiz (South Iberian Margin) revealed a high number of chemosymbiotic species, namely bivalves and siboglinid polychaetes. In this study we give an overview of the distribution and life styles of these species in the Gulf of Cadiz, determine the role of autotrophic symbionts in the nutrition of selected species using stable isotope analyses (δ13C, δ15N and δ34S) and investigate the intra-specific variation of isotope signatures within and between study sites. During our studies, we identified twenty siboglinidae and nine bivalve che

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Paschoalini, Victor Uber, and Marcos César de Oliveira Santos. "Movements and habitat use of bottlenose dolphins, Tursiops truncatus, in south-eastern Brazil." Journal of the Marine Biological Association of the United Kingdom 100, no. 4 (2020): 651–62. http://dx.doi.org/10.1017/s0025315420000387.

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AbstractBottlenose dolphins (Tursiops truncatus) have been surveyed for at least two decades on the southern Brazilian coast. However, little is known about their distribution and habitat use in lower latitudes of the South-western Atlantic Ocean. Aiming to study the movements and distribution of the species along the south-eastern Brazilian coast, we made a comparison of photo-identified individuals of the species catalogued in 21 cruises conducted between 2012 and 2015. Additionally, we performed stable isotope analyses of carbon and nitrogen in skin samples (N = 35) to provide some insights

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Zhao, Chunxu, Chunyan Shen, Andrew Bakun, Yunrong Yan, and Bin Kang. "Purpleback Flying Squid Sthenoteuthis oualaniensis in the South China Sea: Growth, Resources and Association with the Environment." Water 13, no. 1 (2020): 65. http://dx.doi.org/10.3390/w13010065.

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The purpleback flying squid (Ommastrephidae: Sthenoteuthis oualaniensis) is an important species at higher trophic levels of the regional marine ecosystem in the South China Sea (SCS), where it is considered to show the potential for fishery development. Accordingly, under increasing climatic and environmental changes, understanding the nature and importance of various factors that determine the spatial and temporal distribution and abundance of S. oualaniensis in the SCS is of great scientific and socio-economic interest. Using generalized additive model (GAM) methods, we analyzed the relatio

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Suryan, Robert M., and Karen N. Fischer. "Stable isotope analysis and satellite tracking reveal interspecific resource partitioning of nonbreeding albatrosses off Alaska." Canadian Journal of Zoology 88, no. 3 (2010): 299–305. http://dx.doi.org/10.1139/z10-002.

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Albatrosses (Diomedeidae) are the most threatened family of birds globally. The three North Pacific species ( Phoebastria Reichenbach, 1853) are listed as either endangered or vulnerable, with the population of Short-tailed Albatross ( Phoebastria albatrus (Pallas, 1769)) less than 1% of its historical size. All North Pacific albatross species do not currently breed sympatrically, yet they do co-occur at-sea during the nonbreeding season. We incorporated stable isotope analysis with the first simultaneous satellite-tracking study of all three North Pacific albatross species while sympatric on

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Unsworth, Richard K. F., and Emma G. Butterworth. "Seagrass Meadows Provide a Significant Resource in Support of Avifauna." Diversity 13, no. 8 (2021): 363. http://dx.doi.org/10.3390/d13080363.

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Seagrass meadows are known to be rich in fauna, with complex food webs that provide trophic subsidy to species and habitats way beyond the extent of their distribution. Birds are an often-overlooked part of marine ecosystems; not only are they crucial to the health of marine ecosystems, but their populations are also supported by the productivity and biodiversity of marine ecosystems. The links of birds to specific habitat types such as seagrass meadows are largely not considered except in the context of direct herbivorous consumption. Here, we examine the linkages between seagrass and birds a

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Oviedo, Santiago Turcatti, and Flávia P. Tirelli. "Spatial distribution and daily activity patterns of three carnivore species in temperate grasslands of southern Brazil and northern Uruguay." Brazilian Journal of Animal and Environmental Research 6, no. 4 (2023): 3572–89. http://dx.doi.org/10.34188/bjaerv6n4-039.

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In the temperate grasslands of southern Brazil and northern Uruguay, three species of mesopredators have similar size, are in the same guild, and they seem to tolerate anthropogenic modifications. Sympatric species from the same trophic guild tend to divide resources both spatially and temporally to facilitate coexistence. The aim of this study was to determine the patterns of the periods of daily activity and habitat use through different detection and occupancy models, of Cerdocyon thous (crab-eating fox), Lycalopex gymnocercus (pampas fox) and Leopardus geoffroyi (geoffroy's cat) in the mos

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Langan, Joseph, Curry Cunningham, Jordan Watson, and Skip McKinnell. "Pacific Salmon at Sea: Using Historical Data to Characterize Distributions in a Warming Ocean." Technical Report, no. 23 (January 8, 2025): 1–3. https://doi.org/10.23849/npafctr23/654-hy7.

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Pacific salmon (Oncorhynchus spp.) spend a large portion of their life cycle in the open ocean, where their growth, survival, trophic interactions, and habitat selection are influenced by ocean conditions (Mueter et al. 2005; Farley et al. 2020; Litzow et al. 2020). As they travel across great distances in these offshore habitats, the vulnerability of salmon to fisheries interactions has also been a subject of concern in recent years (https://npafc.org/enforcement-activities/; Oozeki et al. 2018). Investigating salmon marine spatial dynamics through directed sampling efforts, however, is both

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Gallo, Jéssica, and Maria Elina Bichuette. "Spatial distribution and population data of cave millipedes, genus Pseudonannolene Silvestri, 1895 (Diplopoda, Spirostreptida) from Brazil." ARPHA Conference Abstracts 1 (October 2, 2018): e30225. https://doi.org/10.3897/aca.1.e30225.

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Millipedes are widely found inside caves, where they are favoured by the darkness and the high humidity. Despite this, no population studies focusing their distribution along environmental gradients have been done so far. This study aimed to estimate the population density and spatial distribution of one troglophilic species of <i>Pseudonannolene</i> from a cave located in southeast Brazil. The data were obtained through the visual census method through bases distributed in different zones and substrates along the cave. The population density varied from 0.07 ind.m-² (9 individuals) at the beg

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Palacz, A. P., M. A. St John, R. J. W. Brewin, T. Hirata, and W. W. Gregg. "Distribution of phytoplankton functional types in high-nitrate, low-chlorophyll waters in a new diagnostic ecological indicator model." Biogeosciences 10, no. 11 (2013): 7553–74. http://dx.doi.org/10.5194/bg-10-7553-2013.

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Abstract. Modeling and monitoring plankton functional types (PFTs) is challenged by the insufficient amount of field measurements of ground truths in both plankton models and bio-optical algorithms. In this study, we combine remote sensing data and a dynamic plankton model to simulate an ecologically sound spatial and temporal distribution of phyto-PFTs. We apply an innovative ecological indicator approach to modeling PFTs and focus on resolving the question of diatom–coccolithophore coexistence in the subpolar high-nitrate and low-chlorophyll regions. We choose an artificial neural network as

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Palacz, A. P., M. A. St John, R. J. W. Brewin, T. Hirata, and W. W. Gregg. "Distribution of phytoplankton functional types in high-nitrate low-chlorophyll waters in a new diagnostic ecological indicator model." Biogeosciences Discussions 10, no. 5 (2013): 8103–57. http://dx.doi.org/10.5194/bgd-10-8103-2013.

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Abstract. Modeling and monitoring plankton functional types (PFTs) is challenged by insufficient amount of field measurements to ground-truth both plankton models and bio-optical algorithms. In this study, we combine remote sensing data and a dynamic plankton model to simulate an ecologically-sound spatial and temporal distribution of phyto-PFTs. We apply an innovative ecological indicator approach to modeling PFTs, and focus on resolving the question of diatom-coccolithophore co-existence in the subpolar high-nitrate and low-chlorophyll regions. We choose an artificial neural network as our m

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Palacz, A. P., John M. A. St., R. J. W. Brewin, T. Hirata, and W. W. Gregg. "Distribution of phytoplankton functional types in high-nitrate, low-chlorophyll waters in a new diagnostic ecological indicator model." Biogeosciences 10 (November 22, 2013): 7553–54. https://doi.org/10.5194/bg-10-7553-2013.

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Modeling and monitoring plankton functional types (PFTs) is challenged by the insufficient amount of field measurements of ground truths in both plankton models and bio-optical algorithms. In this study, we combine remote sensing data and a dynamic plankton model to simulate an ecologically sound spatial and temporal distribution of phyto-PFTs. We apply an innovative ecological indicator approach to modeling PFTs and focus on resolving the question of diatom–coccolithophore coexistence in the subpolar high-nitrate and low-chlorophyll regions. We choose an artificial neural network as our

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Mellon-Duval, Capucine, Mireille Harmelin-Vivien, Luisa Métral, et al. "Trophic ecology of the European hake in the Gulf of Lions, northwestern Mediterranean Sea." Scientia Marina 81, no. 1 (2017): 7. http://dx.doi.org/10.3989/scimar.04356.01a.

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The European hake, Merluccius merluccius, is an important resource for Mediterranean fisheries. This study focuses on juvenile and adult hake feeding ecology in the Gulf of Lions, using information from scientific surveys carried out during two seasons and three years (2004-2006). Stomach content and stable isotope (δ15N, δ13C) analyses were performed, and the main factors explaining variations in δ15N were investigated using GLMs. In the Gulf of Lions, hake mostly fed on crustaceans and fish and a dominant piscivorous regime was reached at 15 cm total length. Pelagic fish (sardine, anchovy an

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Ruiz-Gutiérrez, Fernando, Dulce María Ávila-Nájera, Cuauhtémoc Chávez, and Gerardo Sánchez-Rojas. "Spatial and temporal coexistence of medium-sized felines and their potential preys in Sierra Madre del Sur of Guerrero, México." Therya 14, no. 3 (2023): 319–28. http://dx.doi.org/10.12933/therya-23-1220.

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Two species of similar size and trophic niche could not coexist in the same space and time unless the resources are diverse, abundant, and can be shared. In the Sierra Madre del Sur, Guerrero, Mexico, three felines of similar size coexist, Herpailurus yagouaroundi, Leopardus pardalis, and Leopardus wiedii. The objective of this research was to identify the spatiotemporal patterns that allow the coexistence of three felines and their potential preys, as well as to evaluate how the presence of humans and livestock influence their use of space and time. We hypothesized that the three felines coex

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Hsiao, Po-Yuan, Teruhisa Shimada, Kuo-Wei Lan, Ming-An Lee, and Cheng-Hsin Liao. "Assessing Summertime Primary Production Required in Changed Marine Environments in Upwelling Ecosystems Around the Taiwan Bank." Remote Sensing 13, no. 4 (2021): 765. http://dx.doi.org/10.3390/rs13040765.

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The Taiwan Bank (TB) is located in the southern Taiwan Strait, where the marine environments are affected by South China Sea Warm Current and Kuroshio Branch Current in summer. The bottom water flows upward along the edge of the continental shelf, forming an upwelling region that is an essential high-productivity fishing ground. Using trophic dynamic theory, fishery resources can be converted into primary production required (PPR) by primary production, which indicates the environmental tolerance of marine ecosystems. This study calculated the PPR of benthic and pelagic species, sea surface te

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Le-Alvarado, Meliza, Alfonsina E. Romo-Curiel, Oscar Sosa-Nishizaki, Oscar Hernández-Sánchez, Leticia Barbero, and Sharon Z. Herzka. "Yellowfin tuna (Thunnus albacares) foraging habitat and trophic position in the Gulf of Mexico based on intrinsic isotope tracers." PLOS ONE 16, no. 2 (2021): e0246082. http://dx.doi.org/10.1371/journal.pone.0246082.

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Yellowfin tuna (YFT, Thunnus albacares) is a commercially important species targeted by fisheries in the Gulf of Mexico (GM). Previous studies suggest a high degree of residency in the northern GM, although part of the population performs movements to southern Mexican waters. Whether YFT caught in southern waters also exhibit residency or migrate to the northern gulf is currently uncertain, and little is known regarding their trophic ecology. The isotopic composition (bulk & amino acids) of YFT muscle and liver tissues were compared to a zooplankton-based synoptic isoscape from the entire

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Mammola, Stefano, and Marco Isaia. "Day–night and seasonal variations of a subterranean invertebrate community in the twilight zone." Subterranean Biology 27 (September 19, 2018): 31–51. https://doi.org/10.3897/subtbiol.27.28909.

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Being characterized by the absence of light and a reduced environmental cyclicity, the subterranean domain is generally regarded as temporally stable. Yet, in the proximity of cave entrances (twilight zones), patterns of sunlight and darkness can be detected within the 24-hour day–night cycle. In parallel, changes in the abiotic and biotic conditions are expected; however, these patterns have been rarely explored in animal communities dwelling in the twilight zone. We performed a biological investigation in a small abandoned mine in the Western Alps, monitoring it once per season, both during

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Rodriguez, Curras M., M.C. Romanski, and J.N. Pauli. "The pulsed effects of reintroducing wolves on the carnivore community of Isle Royale." Frontiers in Ecology and the Environment 22 (June 7, 2024): e2750. https://doi.org/10.1002/fee.2750.

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Large carnivores are being globally reintroduced with the goal of restoring ecological interactions. However, the extent that competitive interactions are restored within communities is often unclear. In a before–after study within Isle Royale National Park (in the US state of Michigan), we quantified the spatial, behavioral, trophic, and demographic effects of the reintroduction of a large carnivore (gray wolf; Canis lupus) on meso‐carnivores (red fox; Vulpes vulpes) and small carnivores (American marten; Martes americana). The wolf reintroduction produced a phase‐dependent pulse perturbation

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