Habitat Diversity Mitigates the Impacts of Human Pressure on Stream Biodiversity

被引:2
|
作者
Moi, Dieison A. [1 ]
Kaufmann, Philip R. [2 ,3 ]
Riato, Luisa [2 ]
Romero, Gustavo Q. [1 ]
Kratina, Pavel [4 ]
Teixeira de Mello, Franco [5 ]
Hughes, Robert M. [3 ,6 ]
机构
[1] Univ Estadual Campinas UNICAMP, Dept Biol Anim, Lab Interacoes Multitrof & Biodiversidade, Inst Biol, Campinas, SP, Brazil
[2] US Environm Protect Agcy, Off Res & Dev, Ctr Publ Hlth & Environm Assessment, Pacific Ecol Syst Div, Corvallis, OR 97333 USA
[3] Oregon State Univ, Dept Fisheries Wildlife & Conservat Sci, Corvallis, OR USA
[4] Queen Mary Univ London, Sch Biol & Behav Sci, London, England
[5] Univ Republ, Dept Ecol & Gest Ambiental CURE, Maldonado, Uruguay
[6] Amnis Opes Inst, Corvallis, OR USA
基金
巴西圣保罗研究基金会;
关键词
aquatic insect; fish; freshwater ecosystem; habitat heterogeneity; human pressure; macroecology; multitrophic diversity; FISH; EXTRAPOLATION; HETEROGENEITY; RAREFACTION; DATABASE; INDEX;
D O I
10.1111/gcb.17534
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Recent decades have witnessed substantial changes in freshwater biodiversity worldwide. Although research has shown that freshwater biodiversity can be shaped by changes in habitat diversity and human-induced pressure, the potentials for interaction between these drivers and freshwater biodiversity at large spatial extents remain unclear. To address these issues, we employed a spatially extensive multitrophic fish and insect database from 3323 stream sites across the United States, to investigate the ability of habitat diversity to modulate the effect of human pressure on the richness and abundance of fish and insects. We found evidence that high levels of habitat diversity were associated with increased richness and abundance of fish and insects (including whole-assemblage and individual trophic guilds). We also show that the effects of human pressure on the richness and abundance of fish and insects tend to become positive at high levels of habitat diversity. Where habitat diversity is low, human pressure strongly reduces insect richness and abundance, whereas these reductions are attenuated at high levels of habitat diversity. Structural equation modeling revealed that human pressure reduced habitat diversity, indirectly negatively affecting the richness and abundance of fish and insects. These findings illustrate that, in addition to promoting greater fish and insect biodiversity, habitat diversity may mitigate the deleterious effects of human pressures on these two stream assemblages. Overall, our study suggests that maintaining high levels of habitat diversity is a useful way to protect freshwater biodiversity from ongoing increases in human pressure. However, if human pressures continue to increase, this will reduce habitat diversity, further threatening stream assemblages. This study shows that the high diversity of natural habitats increases the richness and abundance of fish and insects in streams. Habitat diversity also reduces the negative effects of human pressure on the richness and abundance of fish and insects. Human pressure reduces the diversity of natural habitats in streams, indirectly reducing the richness and abundance of fish and insects. This study illustrates that maintaining high levels of natural habitat diversity is a useful alternative to protect fish and insects from increasing human pressure. If human pressures continue to increase, this will reduce habitat diversity, negatively affecting fish and insects.image
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页数:12
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