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65 results for “isotopic niche”
Stomach contents (1977-1981) and stable isotopes (1994) from the Everglades, Florida, USA from the publication "Fishes in a seasonally pulsed wetland show spatiotemporal shifts in diet and trophic niche but not shifts in trophic position"
Stomach contents of fishes (1977-1981) and stable isotopes of fishes, invertebrates, and basal resources (1994) were collected from spikerush marsh, sawgrass ridge, and alligator pond habitats in Shark River Slough, Everglades National Park, Florida, USA. These data were used to quantify diet, trophic niche area, trophic position, basal resource use and how these metrics vary among size classes, seasons, and habitats. Data collection is complete. These data support Flood et al. (2023). Associated R code will be made available through Peter Flood's GitHub: https://github.com/pjflood/historic_everglades_aquatic_food_web. References: Flood, Peter J., William F. Loftus, and Joel C. Trexler. "Fishes in a seasonally pulsed wetland show spatiotemporal shifts in diet and trophic niche but not shifts in trophic position." Food Webs 34 (2023): e00265. https://doi.org/10.1016/j.fooweb.2022.e00265
R code for archaeological examples of calculating isotopic niche space and overlap using the rKIN package
<p>This R code was written to apply the tools of the rKIN package to calculate isotopic niche space and overlap for the three archaeological case studies for the manuscript Investigating Isotopic Niche Space: Using rKIN for Stable Isotope Studies in Archaeology published in the Journal of Archaeological Method and Theory. Raw data for the case studies are available in the supplemental Excel file.</p>
Figure 5 in Variations in trophic niches of generalist predators with plant community composition as indicated by stable isotopes and fatty acids
Figure 5. Principal components analysis of the relative abundance (mol %, logit- transformed) of individual NLFAs of Trochosa ruricola using body size (small, large), flooding index (FI), plant species richness (SR), plant functional group richness (FG), presence of grasses (Gr), legumes (Leg), small herbs (SH) and tall herbs (TH) as supplementary variables.
Figure 4 in Variations in trophic niches of generalist predators with plant community composition as indicated by stable isotopes and fatty acids
Figure 4. Variations in δ15N signatures of Trochosa ruricola as affected by flooding index (P = 0.04, R2 = 0.12) and body size (small, large; P <0.01).
Figure 1 in Variations in trophic niches of generalist predators with plant community composition as indicated by stable isotopes and fatty acids
Figure 1. Variations in δ15N and δ13C signatures of Harpalus rufipes (black) and Trochosa ruricola (pink) across the study site of the Jena Experiment.
Figure 3 in Variations in trophic niches of generalist predators with plant community composition as indicated by stable isotopes and fatty acids
Figure 3. Principal components analysis of the relative abundance (mol %, logit-transformed) of individual NLFAs of Harpalus rufipes using flooding index (FI), plant species richness (SR), plant functional group richness (FG), presence of grasses (Gr), legumes (Leg), small herbs (SH) and tall herbs (TH) as supplementary variables.
Figure 6 in Variations in trophic niches of generalist predators with plant community composition as indicated by stable isotopes and fatty acids
Figure 6. Principal components analysis of the relative abundance (mol%, logit- transformed) of individual PLFAs of soil microorganisms using flooding index (FI), plant species richness (SR), plant functional group richness (FG), presence of grasses (Gr), legumes (Leg), small herbs (SH) and tall herbs (TH) as supplementary variables.
Figure 2 in Variations in trophic niches of generalist predators with plant community composition as indicated by stable isotopes and fatty acids
Figure 2. Variations in δ15N signatures of Harpalus rufipes (P <0.01, R2 = 0.11) as affected by plant species richness (log-transformed).
Isotopic niche partitioning and individual specialization in an Arctic raptor guild
<p>Intra- and inter-specific resource partitioning within predator communities is a fundamental component of trophic ecology, and one proposed mechanism for how populations partition resources is through individual niche variation. The Niche Variation Hypothesis (NVH) predicts that inter-individual trait variation leads to functional trade-offs in foraging efficiency, resulting in populations composed of individual dietary specialists. The degree to which niche specialization persists within a population is plastic and responsive to fluctuating resource availability. We quantified niche overlap and tested the NVH within an Arctic raptor guild, focusing on three species that employ different foraging strategies: golden eagles (generalists); gyrfalcons (facultative specialists); and rough-legged hawks (specialists). Tundra ecosystems exhibit cyclic populations of arvicoline rodents (lemmings and voles), providing a unique system in which to examine predator diet in response to interannual fluctuations in resource availability. Using blood δ13C and δ15N values from 189 raptor nestlings on Alaska's Seward Peninsula (2014–2019), we calculated isotopic niche width and used Bayesian stable isotope mixing models (BSIMMs) to characterize individual specialization and test the NVH. Nest-level specialization estimated from stable isotopes was strongly correlated with indices of specialization based on camera trap data. We observed a high degree of isotopic niche overlap between the three species and gyrfalcons displayed a positive relationship between individual specialization and population niche width on an interannual basis consistent with the NVH. Our findings suggest plasticity in niche specialization may reduce intra- and inter-specific resource competition under dynamic ecological conditions.</p>
Data archive: Niche overlap between a cold-water coral and an associated sponge for isotopically-enriched particulate food sources
<p>Data belonging to the paper: </p> <p>Dick van Oevelen, Christina E. Mueller, Tomas Lundälv, Fleur C. van Duyl, Jasper M. de Goeij, Jack J. Middelburg<span> </span>(In press) <strong>Niche overlap between a cold-water coral and an associated sponge for isotopically-enriched particulate food sources</strong>. PLOS ONE</p>
Fig. 4 in Isotopic Niche Differentiation Among Mammals From A Rainforest In Peninsular Malaysia
Fig. 4. Differences (mean ± SE) in δ15N (A: F = 17.316; P <0.001) and δ13C (B: F = 19.100; P <0.001) in individuals classified into 3, 48 3, 48 different dietary lifestyle. Tamhane pairwise comparison post-hoc groups membership indicated by a, b, and c.
Fig. 2 in Isotopic Niche Differentiation Among Mammals From A Rainforest In Peninsular Malaysia
Fig. 2. Differences (mean ± SE) in δ 15N (A) and δ13C (B) identified in hair samples from eight mammalian species of a tropical rainforest in Peninsular Malaysia. Mouse-deer samples that could not be classified to species level were coded as mouse-deer.
Fig. 3 in Isotopic Niche Differentiation Among Mammals From A Rainforest In Peninsular Malaysia
Fig. 3. Differences (mean ± SE) in δ15N (A: F = 10.046; P <0.001) and δ13C (B: F = 5.728; P = 0.006) among taxa classified into 2, 48 2, 48 different habitat types. Tukey's multiple comparison post-hoc groups membership indicated by a and b.
Fig. 1 in Isotopic Niche Differentiation Among Mammals From A Rainforest In Peninsular Malaysia
Fig. 1. δ15N and δ13C values in hair samples from eight mammalian species of a tropical rainforest in Peninsular Malaysia. The numbers in parentheses indicate sample sizes. Mouse-deer samples that could not be classified to species level were coded as mouse-deer.
Isotopic niche partitioning and individual specialization in an Arctic raptor guild
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Isotopic niche overlap of four large pelagic predatory fish species in the northwest Atlantic ocean
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Seasonal isotopic niche of a rodent: High between-individual variation but no changes in individual niche width during the rich-resource period
<p>The dynamics of trophic niche width in animals at both population- and individual-level is potentially influenced by temporal variation of food resources, by between-individual differences in food-resource rank preferences<span class="fontstyle01"><span>, and also by competition</span></span>. Using stable isotope of carbon and nitrogen (<i>δ</i><sup>13</sup>C and <i>δ</i><sup>15</sup>N) of fecal samples, we investigated the trophic niche dynamics and individual variation in food-resource use by the arboreal rat <i>Rhipidomys macrurus</i>, in the highly seasonal Brazilian savanna (Cerrado). We tested the hypothesis that dietary niche expansion during the rich-resource period (wet season) occurs via individual specialization and consequently lower individual niche overlap in contrast with niche retraction during the low-resource period (dry season) via increase in niche overlap and expansion of individual niches. The results indicated that <i>R</i>.<i> macrurus</i> is primarily frugivorous and presents a wider isotopic niche in the rich-resource period in comparison to the low-resource period. The increase in niche width was achieved by individual specialization (decrease in niche overlap), as expected. During the low-resource period, however, individual niche widths were not wider than during the rich-resource period. Additionally, individual body condition was lower in the wet season than in the dry season, suggesting higher competition in this period. We conclude that an increase in the population niche may involve only between-individual variation and not necessarily requiring changes in individual niche width. We propose that the combination of ecological opportunity (high resource diversity) in addition to a greater competition in the warm-wet season leads to expansion of the population trophic niche width via individual specialization. </p>
Data from: Spider webs, stable isotopes and molecular gut content analysis: multiple lines of evidence support trophic niche differentiation in a community of Hawaiian spiders
1. Adaptive radiations are typically characterized by niche partitioning among their constituent species. Trophic niche partitioning is particularly important in predatory animals, which rely on limited food resources for survival. 2. We test for trophic niche partitioning in an adaptive radiation of Hawaiian Tetragnatha spiders, which have diversified in situ on the Hawaiian Islands. We focus on a community of nine species belonging to two different clades, one web building and the other actively hunting, which co-occur in wet forest on East Maui. We hypothesize that trophic niches differ significantly both 1) among species within a clade, indicating food resource partitioning, and 2) between the two clades, corresponding with their differences in foraging strategy. 3. To assess niches of the spider species, we measure a) web architecture, the structure of the hunting tool, and b) site choice, the physical placement of the web in the habitat. We then test whether differences in these parameters translate into meaningful differences in trophic niche by measuring c) stable isotope signatures of carbon and nitrogen in the spiders' tissues, and d) gut content of spiders based on metabarcoding data. 4. We find significant interspecific differences in web architecture and site choice. Importantly, these differences are reflected in stable isotope signatures among the five web-building species, as well as significant isotopic differences between web-builders and active hunters. Gut content data also show interspecific and inter-clade differences. Pairwise overlaps of web architecture between species are positively correlated with overlaps of isotopic signature. 5. Our results reveal trophic niche partitioning among species within each clade, as well as between the web-building and actively hunting clades. Based on the correlation between web architecture and stable isotopes, it appears that the isotopic signatures of spiders' tissues are influenced by architectural differences among their webs. Our findings indicate an important link between web structure, microhabitat preference and diet in the Hawaiian Tetragnatha.
Data from: Isotopic niches support the resource breadth hypothesis
Because a broad spectrum of resource use allows species to persist in a wide range of habitat types, and thus permits them to occupy large geographical areas, and because broadly distributed species have access to more diverse resource bases, the resource breadth hypothesis posits that the diversity of resources used by organisms should be positively related with the extent of their geographic ranges. We investigated isotopic niche width in a small radiation of South American birds in the genus Cinclodes. We analysed feathers of 12 species of Cinclodes to test the isotopic version of the resource breadth hypothesis and to examine the correlation between isotopic niche breadth and morphology. We found a positive correlation between the widths of hydrogen and oxygen isotopic niches (which estimate breadth of elevational range) and widths of the carbon and nitrogen isotopic niches (which estimates the diversity of resources consumed, and hence of habitats used). We also found a positive correlation between broad isotopic niches and wing morphology. Our study not only supports the resource breadth hypothesis but it also highlights the usefulness of stable isotope analyses as tools in the exploration of ecological niches. It is an example of a macroecological application of stable isotopes. It also illustrates the importance of scientific collections in ecological studies.
Dataset of: Deconvolving feeding niches and strategies of abyssal holothurians from their stable isotope, amino acid, and fatty acid composition
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