Habitat Fragmentation Affects Richness—A View Through a Metacommunity Lens DOI Creative Commons

Jessica Marchesan,

Jurek Kolasa

Diversity, Journal Year: 2024, Volume and Issue: 16(11), P. 658 - 658

Published: Oct. 25, 2024

Habitat fragmentation is often assumed to negatively impact species diversity because smaller, more isolated populations on smaller habitat patches are at a higher extinction risk. However, some empirical and theoretical studies suggest that landscapes with numerous small may support richness, although the circumstances remain elusive. We used an agent-based metacommunity model investigate this simulate of same total area but diverse patch sizes. Our model, as generic unbiased by specific assumptions possible, aimed explore which be conducive supporting biodiversity. To end, most parameters behaviors were random. The included generalized traits, dispersal, interactions richness dynamics in fragmented distinct results show many maintain than those fewer large patches. Moreover, relationship between connectivity pronounced High these preventing local extinctions facilitating recolonization. In contrast, less significant large-patch landscapes, where generalist dominate. findings highlight complex interplay size quality, connectivity, among determining richness. patterns produced represent null predictions useful reference for specialized questions predictions. These insights also have implications conservation strategies, suggesting maintaining mosaic small, well-connected could enhance biodiversity landscapes.

Language: Английский

Assessing Site and Species Associations With Beta Diversity of Fish Assemblages in Amazonian Streams DOI
Maria Dayanne Lima de Lucena, André Ribeiro Martins,

Lílian Casatti

et al.

Freshwater Biology, Journal Year: 2025, Volume and Issue: 70(1)

Published: Jan. 1, 2025

ABSTRACT The increasing environmental changes threatening the fish fauna of streams are driving a growing interest in understanding how sites and species contribute to diversity, as this is important information for decision‐making related management conservation priority areas species. objective study was understand factors, spatial distance between streams, land use, cover (landscape) may be associated with uniqueness assemblages Amazonian streams. We sampled characterised conditions 29 within around Tapajós River basin, near Amazon National Park Brazil. Each stream studied along 150‐m stretch. variables local contribution beta diversity (LCBD) were vegetation presence refuges. Streams inside outside park showed similar contributions diversity. Species richness abundance negative relationship LCBD, suggesting that unique tended have few low abundance. contributed most (SCBD) had intermediate occurrence, high abundance, non‐marginal niches. did not observe an effect niche breadth on SCBD, both generalist specialist equally Our findings underscore role ecological uniqueness. Sites composition also exhibit demonstrates importance conserving biodiversity face changes. By examining species, we highlight considering habitat quality protecting these ecosystems against challenges global change.

Language: Английский

Citations

0
Fish Diversity Patterns and Their Responses to Environmental Factors in a Global Biodiversity Hotspot DOI
Yiqing Zhou, Hong-Fei Hu,

Chongguang Chen

et al.

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(4)

Published: April 1, 2025

ABSTRACT Biodiversity loss has increased interest in understanding biodiversity patterns and their driving mechanisms global. A growing of empirical evidence suggests that, addition to purely species diversity, studies phylogenetic diversity can provide distinct but complementary information about mechanisms. However, there was still a lack research on integrating analyse the spatial fish diversity. Here, we evaluated response assemblages environmental factors Jiangxi Province. The results showed that 243 were recorded province, including 14 invasive species. There 126 native China 33 endemic Yangtze River Basin. Red List IUCN assessments 31 (12.8%) 16 (6.6%) Threatened or Near (1 Extinct; 6 1 Critically Endangered; 3 Endangered, 8 5 Vulnerable, Threatened), respectively. number carnivorous (111), demersal (143) resident (153) higher than other functional taxa. Fish not significantly differences ( p = 0.521), exhibited 0.001). turnover (0.53) nestedness (0.17), larger protected areas would be necessary conserve regional biodiversity. Environmental geographic generally had no significant effect only nitrate nitrogen correlated with highlight importance evaluating both when identifying useful implications guidance for conservation regions facing human disturbances.

Language: Английский

Citations

0
The role of the environment and connectivity on multiple facets of local fish diversity in tropical headwater streams DOI
André Ribeiro Martins, Douglas Aviz Bastos, Leandro Melo de Sousa

et al.

Freshwater Biology, Journal Year: 2024, Volume and Issue: 69(10), P. 1376 - 1389

Published: July 30, 2024

Abstract The identification of multiple facets biodiversity (e.g., phylogenetic and functional) can help to understand how evolutionary ecological mechanisms shape the assembly biological communities. Here, we employed regressions variance partitions investigate effects environmental conditions, connectivity space on aspects functional fish fauna in tropical headwater streams Xingu River basin, Eastern Amazonia. We found that diversities communities are related local conditions stream drainage network, with marked differences occurring between rainy dry periods. Furthermore, discovered uniqueness was influenced mainly by factors, whereas had a more complex relationship influence factors connectivity. Our findings indicate assemblages small basin share close history. This is probably because climatic stability experienced Amazonian ichthyofauna over time. emphasise role niche‐based processes shaping unique composition streams, highlight importance heterogeneity maintaining integrity these freshwater ecosystems.

Language: Английский

Citations

1
Habitat Fragmentation Affects Richness—A View Through a Metacommunity Lens DOI Creative Commons

Jessica Marchesan,

Jurek Kolasa

Diversity, Journal Year: 2024, Volume and Issue: 16(11), P. 658 - 658

Published: Oct. 25, 2024

Habitat fragmentation is often assumed to negatively impact species diversity because smaller, more isolated populations on smaller habitat patches are at a higher extinction risk. However, some empirical and theoretical studies suggest that landscapes with numerous small may support richness, although the circumstances remain elusive. We used an agent-based metacommunity model investigate this simulate of same total area but diverse patch sizes. Our model, as generic unbiased by specific assumptions possible, aimed explore which be conducive supporting biodiversity. To end, most parameters behaviors were random. The included generalized traits, dispersal, interactions richness dynamics in fragmented distinct results show many maintain than those fewer large patches. Moreover, relationship between connectivity pronounced High these preventing local extinctions facilitating recolonization. In contrast, less significant large-patch landscapes, where generalist dominate. findings highlight complex interplay size quality, connectivity, among determining richness. patterns produced represent null predictions useful reference for specialized questions predictions. These insights also have implications conservation strategies, suggesting maintaining mosaic small, well-connected could enhance biodiversity landscapes.

Language: Английский

Citations

0