The influence of land use, microhabitat and aquatic insect subsidies on predatory riparian arthropod distributions

IF 2 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Peter E. Carlson
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引用次数: 0

Abstract

Agricultural land use effects on aquatic and riparian communities are complex and multifaceted, resulting in habitat degradation and biodiversity loss in riparian and instream ecosystems. This study correlated predatory arthropod densities and species richness to abundance of potential prey (emerged aquatic insects and terrestrial dipterans) along an agricultural to forested land use gradient. Pearson’s correlation coefficient was used as an effect size to measure attraction to prey, and the ratio of predator to prey was calculated to indicate potential consumption capacity of prey. Results revealed that gradients in land use and microhabitat condition, distance from the stream and season were important explanatory factors. Positive correlations between predatory arthropods and aquatic insect abundance were more apparent than those with terrestrial dipteran abundance, suggesting an overall preference of aquatic prey. However, positive correlations between predatory arthropods and adult aquatic insect subsidies were strongest in microhabitats with characteristics associated with higher moisture (e.g., greater soil organic matter and shade), particularly with increasing agricultural land use. In September, there was an indication of reduced confinement to microhabitats, likely as an effect of elevated seasonal precipitation. Overall results of this study suggest that a limited tolerance to desiccation in predatory arthropods increases spatial confinement with agricultural land use and ultimately restricts access to adult aquatic insect subsidies. The findings of this study have implications for the pathways that adult aquatic insect subsidies use to enter into riparian food webs with consequences that could cascade across trophic levels and larger spatial scales.

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来源期刊
Aquatic Sciences
Aquatic Sciences 环境科学-海洋与淡水生物学
CiteScore
3.90
自引率
4.20%
发文量
60
审稿时长
1 months
期刊介绍: Aquatic Sciences – Research Across Boundaries publishes original research, overviews, and reviews dealing with aquatic systems (both freshwater and marine systems) and their boundaries, including the impact of human activities on these systems. The coverage ranges from molecular-level mechanistic studies to investigations at the whole ecosystem scale. Aquatic Sciences publishes articles presenting research across disciplinary and environmental boundaries, including studies examining interactions among geological, microbial, biological, chemical, physical, hydrological, and societal processes, as well as studies assessing land-water, air-water, benthic-pelagic, river-ocean, lentic-lotic, and groundwater-surface water interactions.
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