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54 results for “habitat niche”
Data from: Broad and flexible stable isotope niches in invasive non-native Rattus spp. in anthropogenic and natural habitats of central eastern Madagascar
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Data from: Habitat niche breadth predicts invasiveness in solitary ascidians
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Habitat alteration facilitates the dominance of invasive species through disrupting niche partitioning in floodplain wetlands
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Data from: Lizards in the mist: thermal niches constrained by habitat and microclimates in the Andes of southern Bolivia
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Habitat selection and refuge-use by a color polymorphic salamander reveal behavioral niche differences
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Data from: Habitat filtering determines the functional niche occupancy of plant communities worldwide
How the patterns of niche occupancy vary from species-poor to species-rich communities is a fundamental question in ecology that has a central bearing on the processes that drive patterns of biodiversity. As species richness increases, habitat filtering should constrain the expansion of total niche volume, while limiting similarity should restrict the degree of niche overlap between species. Here, by explicitly incorporating intraspecific trait variability, we investigate the relationship between functional niche occupancy and species richness at the global scale. We assembled 21 datasets worldwide, spanning tropical to temperate biomes and consisting of 313 plant communities representing different growth forms. We quantified three key niche occupancy components (the total functional volume, the functional overlap between species and the average functional volume per species) for each community, related each component to species richness, and compared each component to the null expectations. As species richness increased, communities were more functionally diverse (an increase in total functional volume), and species overlapped more within the community (an increase in functional overlap) but did not more finely divide the functional space (no decline in average functional volume). Null model analyses provided evidence for habitat filtering (smaller total functional volume than expectation), but not for limiting similarity (larger functional overlap and larger average functional volume than expectation) as a process driving the pattern of functional niche occupancy. Synthesis. Habitat filtering is a widespread process driving the pattern of functional niche occupancy across plant communities and coexisting species tend to be more functionally similar rather than more functionally specialized. Our results indicate that including intraspecific trait variability will contribute to a better understanding of the processes driving patterns of functional niche occupancy.
The flooded habitat adaptation, niche differentiation and evolution of Myristicaceae trees in the Western Ghats biodiversity hotspot in India
<p><span>Environmental heterogeneity is considered as one of the main drivers of habitat specialization and niche evolution among tropical plant lineages, and local scale habitat specialization promotes niche differentiation among sister taxa. In this study, we examined the degree to which habitat specialization lead to niche differentiation across the distribution range of a given species using five species of the family Myristicaceae native to Western Ghats, India as an example. In the Western Ghats, Myristicaceae species occur in two main habitat types, namely freshwater swamps (flooded habitat), and terra-firme forest (non-flooded habitat) distributed across a seasonal flooding gradient. First, we reconstructed the evolutionary history of flooded habitat specialization among global and Western Ghats Myristicaceae by mapping flooded habitat association and traits conferring flood tolerance (example: aerial roots) on a dated phylogeny. Then we investigated climatic niche differences among lineages occupying flooded and terra-firme habitats using occurrence data and environmental variables. Our analysis revealed swampy habitat occurrence as the probable ancestral state with subsequent speciation events leading to adaptation to non-swampy habitats. We also show that traits conferring flood tolerance have evolved independently several times during the evolution of Myristicaceae. Furthermore, phylogenetically distantly related Myristicaceae taxa occupying different habitats (flooded and terra-firme habitat) in Western Ghats show significant niche divergence. Overall, the repeated gain of swampy habitat specialization and associated morphological traits and evidence for habitat associated climatic niche divergence among Myristicaceae taxa suggest that seasonal flooding may have been an important driver of ecological diversification in this primitive plant family.</span></p>
Impacts of climate-driven changes in habitat phenology on dynamics of niche overlaps and spatial associations in a boreal waterbird community
<p>A fundamental, yet little explored question is if climate change has affected niche relationships and spatial associations of native non-invasive species in established local communities, potentially affecting interspecific interactions and community organization. Here, long-term (1991–2020) changes in habitat niche overlaps (HNO) and spatial associations (SA) were studied in relation to climate-driven changes in habitat phenology in a community of eight migratory waterbird species breeding on 37 lakes in southeastern Finland.</p> <p>Overall timing of ice-out (IOD) and within-season variation in the timing of ice-out (standard deviation of IOD; SDIOD) in lakes determine habitat availability for waterbirds during the settling phase. Previous work has documented that IOD has advanced and SDIOD increased during the study period, with species responding differently to these changes in their habitat use.</p> <p>HNO and SA varied considerably in the 28 species pairs during the study period. The effect of IOD and SDIOD on that variation was generally small. However, the direction and magnitude of the effects of IOD and SDIOD on HNO and SA varied considerably among the species pairs. Overall differences in the direction and magnitude of the effect sizes suggested that the impacts of IOD and SDIOD on HNO and SA were stronger in species pairs in which the species were more similar in terms of settling phenology and stronger for early settling species than for late settling species. Observed changes in niche relationships probably reflect changes in interspecific interactions and affect the possibilities for heterospecific information use in habitat selection. </p>
The flooded habitat adaptation, niche differentiation and evolution of Myristicaceae trees in the Western Ghats biodiversity hotspot in India
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Data from: Habitat filtering determines the functional niche occupancy of plant communities worldwide
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Data from: Niches in the Anthropocene: passerine assemblages show niche expansion from natural to urban habitats
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Impacts of climate-driven changes in habitat phenology on dynamics of niche overlaps and spatial associations in a boreal waterbird community
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Data from: Testing the niche breadth-range size hypothesis: habitat specialization versus performance in Australian alpine daisies
Relatively common species within a clade are expected to perform well across a wider range of conditions than their rarer relatives, yet experimental tests of this "niche breadth—range size" hypothesis remain surprisingly scarce. Rarity may arise due to trade-offs between specialization and performance across a wide range of environments. Here we use common garden and reciprocal transplant experiments to test the niche breadth—range size hypothesis, focusing on four common and three rare endemic alpine daisies (Brachyscome spp.) from the Australian Alps. We used three experimental contexts: 1) alpine reciprocal seedling experiment: a test of seedling survival and growth in three alpine habitat types differing in environmental quality and species diversity, 2) warm environment common garden: a test of whether common daisy species have higher growth rates and phenotypic plasticity, assessed in a common garden in a warmer climate and run simultaneously with experiment 1, and 3) alpine reciprocal seed experiment: a test of seed germination capacity and viability in the same three alpine habitat types as in experiment 1. In the alpine reciprocal seedling experiment, survival of all species was highest in the open heathland habitat where overall plant diversity is high, suggesting a general, positive response to a relatively productive, low-stress environment. We found only partial support for higher survival of rare species in their habitats of origin. In the warm environment common garden, three common daisies exhibited greater growth and biomass than two rare species, but the other rare species performed as well as the common species. In the alpine reciprocal seed experiment, common daisies exhibited higher germination across most habitats, but rare species maintained a higher proportion of viable seed in all conditions, suggesting different life history strategies. These results indicate that some but not all rare, alpine endemics exhibit stress tolerance at the cost of reduced growth rates in low-stress environments compared to common species. Finally, these findings suggest the seed stage is important in the persistence of rare species, and they provide only weak support at the seedling stage for the niche breadth-range size hypothesis.
Data from: Testing the niche breadth-range size hypothesis: habitat specialization versus performance in Australian alpine daisies
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.