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24 results for “ecological partitioning”
FIGURE 6 in Trophic ecology and resource partitioning of Haemulidae species along the Northeastern Brazilian continental shelf
FIGURE 6 | A. Scaled isotopic niches and B. Isotopic overlap of Haemulon aurolineatum, H. plumierii and H. squamipina captured along the northeast coast of Brazil.
FIGURE 5 in Trophic ecology and resource partitioning of Haemulidae species along the Northeastern Brazilian continental shelf
FIGURE 5 | Isotopic ratios of carbon (δ¹³C) and nitrogen (δ15N) of Haemulon plumierii, H. aurolineatum and H. squamipinna in different latitude gradient and ontogeny captured along the northeast coast of Brazil. The black horizontal line and box represent the median value and the interquartile range, while the vertical lines represent the upper and lower limits. Outliers were not included in the plot. *All caught specimens of H. squamipinna were considered adults, not allowing ontogenetic analysis. Different symbols (*, ** and **) represent significant difference. Ontogeny* - All caught specimens of H. squamipinna were considered adults, not allowing ontogenetic analysis.
FIGURE 3 in Trophic ecology and resource partitioning of Haemulidae species along the Northeastern Brazilian continental shelf
FIGURE 3 | Modified Costello diagram (Pi, prey specific abundance; Fo, frequency of occurence), a scatterplot containing all prey items, showing the feeding strategy of Haemulon aurolineatum and H. plumierii captured along the northeast coast of Brazil.
FIGURE 1 in Trophic ecology and resource partitioning of Haemulidae species along the Northeastern Brazilian continental shelf
FIGURE 1 | Study area and sample points along the continental shelf of the northeast coast of Brazil. Red dots indicate samples for inner position (≤ 20 km) and black dots for outer (> 20 km).
FIGURE 2 in Trophic ecology and resource partitioning of Haemulidae species along the Northeastern Brazilian continental shelf
FIGURE 2 | Feeding intensity indicator (Fi) of Haemulon aurolineatum and H. plumierii in different habitats, latitude gradient, shelf position, ontogeny and period of the day. The black horizontal line and box represent the median value and the interquartile range, while the vertical lines represent the upper and lower limits. Outliers were not included in the plot. Different symbols (* and **) represent significant difference.
FIGURE 4 in Trophic ecology and resource partitioning of Haemulidae species along the Northeastern Brazilian continental shelf
FIGURE 4 | Isotopic ratios of carbon (δ¹³C) and nitrogen (δ15N) of Haemulon plumierii, H. aurolineatum, and H. squamipinna in different habitats and shelf position captured along the northeast coast of Brazil. The black horizontal line and box represent the median value and the interquartile range, while the vertical lines represent the upper and lower limits. Outliers were not included in the plot. Different symbols (* and **) represent significant difference.
Partitioning species contributions to ecological stability - Data and Code
<p>This repository contains all R code and data used for the manuscript entitled "Partitioning species contributions to ecological stability in disturbed communities".</p> <p>Authors: Charlotte Kunze, Dominik Bahlburg, Pablo Urrutia-Cordero, Maren Striebel, Egle Kelpsiene, Silke Langenheder, Ian Donohue & Helmut Hillebrand</p>
Fine-scale intraspecific niche partitioning in a highly mobile, marine megafauna species: implications for ecology and conservation
<p>A species may partition its realized ecological niche along bionomic and/or scenopoetic axes due to intraspecific competition for limited resources. How partitioning manifests depends on resource needs and availability by and for the partitioning groups. Here we demonstrate the utility of analyzing short- and long-term stable carbon and nitrogen isotope ratios from imperiled marine megafauna to elucidate realized niche partitioning in these species. We captured 113 loggerhead (<em>Caretta</em> <em>caretta</em>) sea turtles at a high-use area near Crystal River, Florida, between 2016–2022, comprising 53 subadults, 10 adult males, and 50 adult females. Isotopic analyses indicated that loggerheads partition their realized ecological niche by life stage, along a scenopoetic axis. Most adults likely forage and reside in shallow areas of the study site, with most subadults displaying habitat switching between deeper locations to forage and shallower locations to rest. Some subadults, like adults, also forage and reside in shallow areas, and may display behaviors to avoid intraspecific competition. Analysis of stable isotopes with different turnover rates was critical for this characterization of intraspecific niche partitioning in loggerhead turtles, which has direct implications for ongoing research and conservation efforts for this and other imperiled species.</p>
Fine-scale intraspecific niche partitioning in a highly mobile, marine megafauna species: implications for ecology and conservation
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FIGURE 9 in Two new Thereus species from Peru, with notes on ecological niche partitioning (Lepidoptera: Lycaenidae: Theclinae)
FIGURE 9. Type locality of Thereus tierralinda sp. nov., with the Manu Road going through Chontachaca on the North along the Cosñipata river (source: Google Earth).
FIGURES 15–19 in Two new Thereus species from Peru, with notes on ecological niche partitioning (Lepidoptera: Lycaenidae: Theclinae)
FIGURES 15–19. Male genitalia, ventral view (on right), left lateral view (at left). 15. Thereus tierralinda sp. nov. (HT, Peru, MUSM). 16. T. illex (Colombia, MNHN). 17. T. columbicola (Peru, CF). 18. T. eryssus (Brazil, CF). 19. T. vicens sp. nov. (HT, Peru, MUSM).
FIGURE 24 in Two new Thereus species from Peru, with notes on ecological niche partitioning (Lepidoptera: Lycaenidae: Theclinae)
FIGURE 24. Flight zone of T. tierralinda sp. nov. in 2019 and 2021 (higher oval) and the approximate flight zone of T. columbicola in 2017 and 2018 (lower oval) from a riverside clearing adjacent to the Tierra Linda Reserve camp (picture taken in 2021). Arrows indicate the preferred location for the observation posts.
FIGURES 20–22 in Two new Thereus species from Peru, with notes on ecological niche partitioning (Lepidoptera: Lycaenidae: Theclinae)
FIGURES 20–22. Female genitalia. Ventral view (at left), lateral view (middle), papilla analis in lateral view (at right). 20. Thereus columbicola (Peru, CF). 21. T. eryssus (Brazil, CF). 22. T. vicens sp. nov. (HT, Peru, MUSM).
FIGURES 1–8 in Two new Thereus species from Peru, with notes on ecological niche partitioning (Lepidoptera: Lycaenidae: Theclinae)
FIGURES 1–8. Adults of Thereus, dorsal view at left. 1.♁ T. tierralinda sp. nov. (HT, Peru, MUSM). 2. ♁ T. illex (Colombia, MNHN). 3. ♁ T. vicens sp. nov. (HT, Peru, MUSM). 4. ♀ T. vicens sp. nov. (Peru, FILS). 5. ♁ T. columbicola (Peru, CF). 6. ♀ T. columbicola (Peru, CF). 7. ♁ T. eryssus (Brazil, CF). 8. ♀ T. eryssus (Brazil, CF).
FIGURE 23 in Two new Thereus species from Peru, with notes on ecological niche partitioning (Lepidoptera: Lycaenidae: Theclinae)
FIGURE 23. Male eighth tergite in ventral view. Anterior border (at bottom) W-shape on Thereus tierralinda sp. nov. (left) and subrectangular on T. vicens sp. nov. (right).
Data from: Coexistence of three sympatric cormorants (Phalacrocorax spp.); partitioning of time as an ecological resource
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Intraspecific dietary variation in niche partitioning within a community of ecologically similar snakes
<p><span>Niche partitioning is an important mechanism for allowing ecologically similar species to coexist, contributing to biodiversity and the functioning of ecological communities. Species partition niches by taking advantage of environmental heterogeneity. However, niche partitioning and species coexistence investigations often do not include intraspecific variation or individual differences like sex and body size even though these factors can have important ecological consequences. Such intrapopulation factors can reduce the number of individuals among species that overlap in resource use and potentially facilitate coexistence. Using stable isotopes (δ<sup>13</sup>C and δ<sup>15</sup>N), we quantified dietary differences among three ecologically similar, sympatric watersnake species: <i>Nerodia erythrogaster</i>, <i>N. rhombifer </i>and <i>N. sipedon</i>. Additionally for each species, we determined intraspecific dietary patterns and determined how those within-species patterns may contribute to dietary niche partitioning among species. <i>Nerodia erythrogaster </i>fed more on terrestrial prey, while <i>N. rhombifer </i>fed at higher trophic levels. Females across species fed at higher trophic levels than did males, and isotopic variance differed between the sexes in <i>N. sipedon</i>. Larger watersnakes foraged at higher trophic levels and fed more on terrestrial prey. Each watersnake species had a distinct diet that overlapped to some degree with the other species' diets, but these diets varied both between sexes and among size groups within species. This inter- and intraspecific dietary variation can facilitate species coexistence by reducing the number of individuals from all species that use the same resources. Intraspecific variation can add important and nuanced layers to the evolution of species coexistence, and research on interspecific niche relationships needs to increasingly consider the effects of these intraspecific variations.</span></p>
Data from: Ecological partitioning among parapatric cryptic species
Geographic range differences among species may result from differences in their physiological tolerances. In the intertidal zone, marine and terrestrial environments intersect to create a unique habitat, across which physiological tolerance strongly influences range. Traits to cope with environmental extremes are particularly important here because many species live near their physiological limits and environmental gradients can be steep. The snail Melampus bidentatus occurs in coastal salt marshes in the western Atlantic and the Gulf of Mexico. We used sequence data from one mitochondrial (COI) and two nuclear markers (histone H3 and a mitochondrial carrier protein, MCP) to identify three cryptic species within this broad-ranging nominal species, two of which have partially overlapping geographic ranges. High genetic diversity, low population structure, and high levels of migration within these two overlapping species suggest that historical range limitations do not entirely explain their different ranges. To identify microhabitat differences between these two species, we modeled their distributions using data from both marine and terrestrial environments. Although temperature was the largest factor setting range limits, other environmental components explained features of the ranges that temperature alone could not. In particular, the interaction of precipitation and salinity likely sets physiological limits that lead to range differences between these two cryptic species. This suggests that the response to climatic change in these snails will be mediated by changes to multiple environmental factors, and not just to temperature alone.
Data from: Ecological partitioning among parapatric cryptic species
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Intraspecific dietary variation in niche partitioning within a community of ecologically similar snakes
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