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158 results for “invertebrate community”
Data from: Exclusion of invertebrates influences saprotrophic fungal community and wood decay rate in an experimental field study
1. Decomposer communities perform an essential ecosystem function by recycling nutrients. However, the effect of higher trophic levels on microbial decomposer communities and rate of decomposition is poorly understood. We therefore conducted an exclusion experiment to test the effect of invertebrates on fungal decomposer communities in dead wood, repeated at 30 sites in two landscapes, and measured wood density to assess effect on decay rate. 2. Invertebrates were excluded from recently cut logs by cages with a 1 mm mesh net, and fungal communities in caged logs were compared to logs accessible to invertebrates by DNA metabarcoding analyses. Accessible logs included control logs, cage control logs and positive control logs. 3. We found that exclusion of invertebrates had a significant effect on fungal community composition. For example, the wood decay fungi Trametes versicolor and T. ochracea were significantly more abundant in accessible logs than in caged logs. The strongest effect on fungal community composition, however, was attributed to differing baseline conditions in the individual trees. When accounting for these baseline differences, caged logs had significantly higher wood density than control logs after two years, indicating lower rates of wood decay in caged logs. 4. Further studies, spanning several years, are required to fully understand the influence of invertebrates on fungi and wood decay. However, our results indicate that invertebrates influence both the composition of saprotrophic communities in dead wood and their decomposition function, which is vital to forest ecosystems.
Figure 5 in Invertebrate communities, sediment parameters and food availability of intertidal soft-sediment ecosystems on the north coast of British Columbia, Canada
Figure 5. Non-metric multidimensional scaling (nMDS) plots showing infaunal invertebrate community at three intertidal sandy shore sites on the north coast of British Columbia, Canada during the summer of 2017. (a) the infaunal community by sandy shore site and sampling round and (b) the vector overlay indicates the direction of increased density, with correlations>0.3 shown. BO: Boulder Beach. GU: Coast Guard Beach. PI: Prescott Inlet. Round A: 23 May–1 June. Round B: 21–26 June. Round C: 19–25 July. Round D: 18–24 August.
Figure 6 in Invertebrate communities, sediment parameters and food availability of intertidal soft-sediment ecosystems on the north coast of British Columbia, Canada
Figure 6. Non-metric multidimensional scaling (nMDS) plots of (a) sediment parameters (depth to the aRPD, water content, particle size, penetrability, % macrophyte coverage, % Zostera marina cover, and % wood cover) by site and round and (b) the food availability (chlorophyll a and organic matter content) at three intertidal sandy shore sites on the north coast of British Columbia, Canada during the summer of 2017. Vector overlays for sediment and food variables show the correlation between variables and nMDS axes, with each vector showing the direction of increased value. BO: Boulder Beach. GU: Coast Guard Beach. PI: Prescott Inlet. Round A: 23 May 23–1 June. Round B: 21–26 June. Round C: 19–25 July. Round D: 18–24 August.
Figure 2 in Invertebrate communities, sediment parameters and food availability of intertidal soft-sediment ecosystems on the north coast of British Columbia, Canada
Figure 2. Flow chart demonstrating statistical analysis conducted on the biotic and abiotic variables sampled at intertidal mudflats (n = 3) and intertidal sandy shores (n = 3) on the north coast of British Columbia, Canada during the summer of 2017.
Figure 1 in Invertebrate communities, sediment parameters and food availability of intertidal soft-sediment ecosystems on the north coast of British Columbia, Canada
Figure 1. Map of intertidal mudflats and sandy shore study sties around Prince Rupert, and on Prescott Island, British Columbia, sampled during summer of 2017. Figure 1(a) shows mudflats close to the Skeena River (CC: Cassiar Cannery 54.1747, 130.1721; TB: Tyee Banks 54.2000, 129.9634; WC: Wolfe Cove 54.2424, 130.2730). Figure 1(b) shows sandy shores on Prescott Island (BO: Boulder Beach 54.0871, 130.5970; PI: Prescott Inlet 54.0709, 130.5950; GU: Coast Guard Beach 54.0659, 130.5757).
Figure 3 in Invertebrate communities, sediment parameters and food availability of intertidal soft-sediment ecosystems on the north coast of British Columbia, Canada
Figure 3. Non-metric multidimensional scaling (nMDS) graphs showing infaunal invertebrate community at three intertidal mudflats on the north coast of British Columbia, Canada during the summer of 2017. (a) the infaunal community by mudflat and sampling round and (b) the vector overlay indicates the direction of increased density, with correlations>0.3 shown. CC: Cassiar Cannery. TB: Tyee Banks. WC: Wolfe Cove. Round A: 23 May–June 1. Round B: 21–26 June. Round C: 19–25 July. Round D: 18–24 August.
Figure 4 in Invertebrate communities, sediment parameters and food availability of intertidal soft-sediment ecosystems on the north coast of British Columbia, Canada
Figure 4. Non-metric multidimensional scaling (nMDS) plots of (a) sediment parameters (depth to the aRPD [apparent redox potential discontinuity], water content, particle size, penetrability, % macrophyte coverage, and % wood cover) by site and round and (b) the food availability (chlorophyll a and organic matter content) at three intertidal mudflats on the north coast of British Columbia, Canada during the summer of 2017. Vector overlays for sediment and food variables show the correlation between variables and nMDS axes, with each vector showing the direction of increased value. CC: Cassiar Cannery. TB: Tyee Banks. WC: Wolfe Cove. Round A: 23 May–1 June. Round B: 21–26 June. Round C: 19–25 July. Round D: 18–24 August.
Heatwave induced invertebrate predation reshapes the plankton community
<p>Climate change stressors including warming and heatwaves can alter zooplankton composition and dominance patterns in shallow lakes, which can disrupt ecosystem function and curtail ecosystem services. To understand such changes, we performed a mesocosm experiment with controls reflecting the present temperature conditions and a treatment reflecting a future climate change scenario, including heatwaves of 0-8°C. In the future climate scenario, the predatory invertebrate, <em>Mesostoma</em> exerted a strong top-down control particularly on <em>Daphnia</em>, resulting in a switch in the herbivore dominance to <em>Ceriodaphnia</em>. Cyclopoid copepods were the least affected taxa but showed tendencies to sustain longer into the winter at elevated temperatures. A complementary predation experiment revealed that <em>Mesostoma</em> feed at a higher rate on <em>Daphnia</em> than on <em>Ceriodaphnia</em> and cyclopoid copepods. In addition to the food-chain alterations, the algal biomass and cyanobacteria increased with warming which has considerable implications for management of shallow lakes.</p>
Impacts on food web properties of island invertebrate communities vary between different human land uses
<p><span>Human land use is of growing concern for island ecosystems. Besides direct impacts on biodiversity, land uses can alter the functioning and structure of ecosystems. Central to this are impacts on food webs. The release of additional nutrients from human origin, habitat homogenization, or environmental filtering due to human land use can change the diet of individual consumer species (i.e., their trophic niches) and the distribution and overlap of trophic niches within a food web. However, it remains largely unclear whether the effects on food web properties vary between the different and predominant human land uses present on islands. Here, we investigated the impact of two dominant human land uses on small oceanic islands (i.e., urban and tourism development) and tested if and how different land uses on islands affect food web structure. To disentangle human land uses, we investigated islands, which were either privately owned by a tourist facility (i.e., exclusively tourism land use) or experienced urban development from the local population (i.e., urban land use), or remained uninhabited, serving as reference sites free of direct land use. Using stable isotope analysis, we show that isotope signature, trophic (isotopic) niches, and overall food web properties of the investigated island invertebrate communities were significantly changed under both land use regimes. While trophic diversity was reduced and trophic niche widths increased under tourism land use, the investigated food webs showed reduced trophic diversity at the food web base and a more uneven trophic niche distribution under urban land use. In summary, these findings show that different human land uses can have contrasting impacts on oceanic island food webs. As oceanic islands experience rapidly growing human land conversion, our results indicate that they may also face increasing yet unpredictable long-term changes in food web dynamics.</span></p>
Data for Individual and combined impacts of carbon dioxide enrichment, heatwaves, flow velocity variability and fine sediment deposition on stream invertebrate communities
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Data from: Habitat connectivity and in-stream vegetation control temporal variability of benthic invertebrate communities
One of the key challenges to understanding patterns of β diversity is to disentangle deterministic patterns from stochastic ones. Stochastic processes may mask the influence of deterministic factors on community dynamics, hindering identification of the mechanisms causing variation in community composition. We studied temporal β diversity (among-year dissimilarity) of macroinvertebrate communities in near-pristine boreal streams across 14 years. To assess whether the observed β diversity deviates from that expected by chance, and to identify processes (deterministic vs. stochastic) through which different explanatory factors affect community variability, we used a null model approach. We observed that at the majority of sites temporal β diversity was low indicating high community stability. When stochastic variation was unaccounted for, connectivity was the only variable explaining temporal β diversity, with weakly connected sites exhibiting higher community variability through time. After accounting for stochastic effects, connectivity lost importance, suggesting that it was related to temporal β diversity via random colonization processes. Instead, β diversity was best explained by in-stream vegetation, community variability decreasing with increasing bryophyte cover. These results highlight the potential of stochastic factors to dampen the influence of deterministic processes, affecting our ability to understand and predict changes in biological communities through time.
Figure 2 in A quantitative survey of the aquatic invertebrate community in the "Monumento natural Salar de Surire" on the Chilean Altiplano
Figure 2. Interaction plot from the two-way ANOVA, including site (three levels) and year (four levels) as factors, and the Shannon diversity index of aquatic invertebrates (log-transformed) as the response variable. The "hot spring" site was not included in this analysis since it never yielded more than one species (i.e. zero diversity). See Results for details.
Data from: The influence of range-wide plant genetic variation on soil invertebrate communities
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Data from: Ecological mechanisms and phylogeny shape invertebrate stoichiometry: a test using detritus-based communities across Central and South America
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Human impacts mediate freshwater invertebrate community responses to and recovery from drought
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Compartmentalized organization of ecological niche occupation in insular invertebrate communities
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Invertebrate community structure predicts natural pest control resilience to insecticide exposure
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Stochastic processes and ecological connectivity drive stream invertebrate community responses to short-term drought
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Data from: Climate-driven hydrological variability determines inter-annual changes in stream invertebrate community assembly
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Data from: Abundance data applied to a novel model invertebrate host sheds new light on parasite community assembly in nature
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Allen Brain Atlas
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International Brain Laboratory public data
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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.