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45 results for “island assemblages”
Supporting tables and figures for Cancel Villamil JJ, Locke SA (2022) - Fish assemblage response to removal of a low‐head dam in the lower reach of a tropical island river, Freshwater Biology
<p>Table S1 summarizes studies of the effects of dams on freshwater fish assemblages</p> <p>Table S2 provides results of fishing in 39 samples in three rivers in Puerto Rico in 2017-2019. See 2, below. </p> <p>Figure S1 shows the relationship between fish species richness and time spent electrofishing in these samples.</p> <p>Abstract of article:</p> <p>1. Dams are often removed from rivers to restore habitat connectivity for biota such as fish. Removal of inland dams is well studied in temperate mainland rivers but this approach has been little studied in fish assemblages in islands, tropic systems, or for dams near the mouth of the river. In Puerto Rico, one of the most intensively dammed territories in the world, all native river fishes migrate between fresh water and the sea, and previous work shows these movements are impeded or blocked by dams.</p> <p>2. Fish assemblages were compared before and after removal of the Cambalache dam, a porous, low-head structure near the mouth of the Río Grande de Arecibo, as well as in two other rivers in Western Puerto Rico, one with a similarly sized and positioned dam, and one reference river without artificial barriers. Fish were sampled using backpack electrofishing on 39 occasions during 2017-2019, including seven samples collected after removal of the Cambalache dam, at between four and six sites per river.</p> <p>3. Fish assemblages upstream from dams were poorer in species, and species richness showed a marginal tendency (P=0.0515) to increase upstream of the Cambalache dam three months after its removal. The two small lowland dams studied herein limited the upstream extent of marine species, which recolonized upstream sites of the Río Grande de Arecibo after removal of the Cambalache dam. An estimate of relative density (catch per unit effort) of common native freshwater species was higher above these two dams, and decreased at upstream sites after removal of the Cambalache dam. The estimated relative density of a native freshwater species that is of conservation concern, the American eel (Anguilla rostrata), was reduced above dams, and increased upstream of the former Cambalache dam after its removal. </p> <p>4. In extensive surveys conducted previously in Puerto Rico, sampling was concentrated higher in the watershed, and native fishes were more common and abundant below than above dams. The present work was conducted near the river mouth, and opposite results were observed. These contrasting results suggest that the effects of dams (or dam removal) on fish assemblages vary along the river gradient, although data from other systems are needed to confirm this.</p> <p>5. The present results suggest low-head dam removal to be a viable method of restoring connectivity in fish assemblages in lower reaches of rivers in Puerto Rico and, potentially, other tropical islands. Removal of dams near the mouth of the river appears to be of particular benefit to marine fish species that use lower river reaches.</p>
Data for taxon-dependent effects of dispersal limitation versus environmental filters on bryophyte assemblages―Multiple perspective studies in land-bridge islands
<p><strong><span>Aim</span></strong><span>: To explore the taxon-dependent contribution of dispersal limitation vs. environmental filters to bryophyte assemblages.</span></p> <p><strong><span>Location</span></strong><span>: The Thousand Island Lake, China </span></p> <p><strong><span>Taxon</span></strong><span>: Bryophytes</span></p> <p><strong><span>Methods</span></strong><span>: We compared the observed beta diversity with the expected values based on six null models (EE, EF, FE, FF, PE, PF) and detected the partial correlation of beta diversity with geographical distances. We quantified the contributions of spatial vs. environmental variables, and island isolation per se to species composition (SC) by using variance partitioning. We modeled the species-area relationships (SARs) for bryophytes and other eight biotas. To explore the taxon-dependent effects of spatial vs. environmental filters on bryophytes, sixteen taxa including five categories (total bryophytes, total mosses, liverworts, acrocarpous and pleurocarpous mosses) and eleven species-richest families were included in the analyses.</span></p> <p><strong><span>Results</span></strong><span>: The observed beta diversity values were significantly different from the predicted values based on the six null models for all 16 taxa. For all five categories, the observed partial correlations between beta diversity and geographical distance after controlling environmental effects were not only positive but also significantly different from the predicted values based on the null models. Spatial eigenvectors are more important in shaping SC than environmental variables for all 16 taxa except Brachytheciaceae and Anomodontaceae. Spatial eigenvectors contributed more to SC variation in liverworts than in mosses, and in pleurocarpous mosses than in acrocarpous mosses. The effects of island isolation on SC were significant for all five categories and varied </span><span>highly </span><span>at the family level. The z-values of the SARs for the five bryophyte categories were all larger than those of the other eight biotas.</span></p> <p><span><strong>Main</strong> <strong>conclusions</strong></span><span>: In subtropical fragmented forests, dispersal limitation exerted significant, taxon-dependent effects on bryophyte assemblages. It was dispersal limitation rather than environmental filtering that predominantly regulated SC patterns of bryophytes. </span></p>
Data from: Edge-mediated compositional and functional decay of tree assemblages in Amazonian forest islands after 26 years of isolation
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The fate of páramo plant assemblages in the sky islands of the northern Andes - Appendix S1. Vegetation and occurrence data used in this study
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Data from: Evidence for stratigraphy in molluscan death assemblages preserved in seagrass beds: St. Croix, U.S. Virgin Islands
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Supporting tables and figures for Cancel Villamil JJ, Locke SA (2022) - Fish assemblage response to removal of a low‐head dam in the lower reach of a tropical island river, Freshwater Biology
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Under the karst: detecting hidden subterranean assemblages using eDNA metabarcoding in the caves of Christmas Island, Australia
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Data from: Rat eradication and the resistance and resilience of passerine bird assemblages in the Falkland Islands
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Data from: Bird assemblages on Amazonian river islands: patterns of species diversity and composition
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Of islands on islands: Natural habitat fragmentation drives microallopatric differentiation in the context of distinct biological assemblages
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Data for taxon-dependent effects of dispersal limitation versus environmental filters on bryophyte assemblages―Multiple perspective studies in land-bridge islands
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Data from: A hierarchical model of whole assemblage island biogeography
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Data from: Phenotypic diversity facilitates niche partitioning in a sky island assemblage of spiny lizards
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Data from: A new framework for investigating biotic homogenization and exploring future trajectories: oceanic island plant and bird assemblages as a case study
Studies of biotic homogenization have focused primarily on characterizing changes that have occurred between some past baseline and the present day. In order to understand how homogenization may change in the future, it is important to contextualize the processes driving these changes. Here, we examine empirical patterns of change in taxonomic similarity among oceanic island plant and bird assemblages. We use these empirical cases to unpack dynamic properties of biotic homogenization, thereby elucidating two important factors that have received little attention: 1) initial similarity and 2) the influence of six classes of introduction and extinction events. We use Jaccard's Index to explore the interplay among these factors in determining the changes in similarity that have occurred between human settlement and the present. Specifically, we develop general formulas for changes in similarity resulting from each of the six types of introductions and extinctions, so that the effect of each event type is formulated in terms of initial similarity and species richness. We then apply these insights to project how similarity levels would change in the future if the present patterns of introductions and extinctions continue. We show that the six event types, along with initial similarity, can show dramatically different behavior in different systems, leading to widely variable influences on similarity. Plant and bird biotas have homogenized only slightly to date, but their trajectories of change are highly divergent. Although existing patterns of colonization and extinction might not continue unchanged, if they were to do so then plant assemblages would show little additional change, whereas bird assemblages would become much more strongly homogenized. Our results suggest that moderate changes in similarity observed to date mask the potential for more dramatic changes in the future, and that the interaction among initial similarity and differential introduction and extinction regimes drives these dynamics.
Features of visitors in the context of island-based assemblage and foraging profile related to Avicennia species from Indian Sundarban mangroves
<p>This dataset demonstrates the assemblage pattern and foraging behavior of insect flower visitors on the <em>Avicennia officinalis </em>and <em>Avicennia marina</em> plant from the mangroves of Indian Sundarban.</p>
DATASET Temporal shifts in algal and fish assemblages following the introduction of herbivorous species in coral reef patches (Bora Bora Island)
<p>Dataset suporting the study of fish succession in Bora Bora</p>
Figures 6-7 in Snake assemblages of Marajó Island, Pará state, Brazil
Figures 6-7. Seasonal variation in frequency of eggs, embryos and offspring of aquatic and semi-aquatic species (6) and terrestrial, arboreal and semi-arboreal species (7) in the Marajó Island, Pará, Brazil.
Figure 3 in Snake assemblages of Marajó Island, Pará state, Brazil
Figure 3. Grouping dendrogram of resource use based on diet and use of foraging substrate data from 61 species recorded in forested areas at Marajó Island, Pará, Brazil.
Figure 1 in Snake assemblages of Marajó Island, Pará state, Brazil
Figure 1. Map showing the location of the Marajó Island, its main plant formations and the territorial boundaries of its municipalities. Modified from Projeto RADAM (1974).
Figure 2 in Snake assemblages of Marajó Island, Pará state, Brazil
Figure 2. Grouping dendrogram of resource use based on diet and use of foraging substrate data from species recorded in open areas at Marajó Island, Pará, Brazil.
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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.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.