Food web structure of three Mediterranean stream reaches along a gradient of anthropogenic impact
| Autor: | Tanner J. Williamson, Luís Chícharo, Pedro Range, Tomasz Boski, José Antonio González-Pérez, Marilia Claro, Katarzyna Sroczyńska |
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| Přispěvatelé: | Foundation for Science and Technology, González-Pérez, José Antonio [0000-0001-7607-1444], Boski, Tomasz [0000-0003-2462-4179], González-Pérez, José Antonio, Boski, Tomasz |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Mediterranean climate Detritus δ13C Ecology 010604 marine biology & hydrobiology isotopic Aquatic Science Hydrobiologia 010603 evolutionary biology 01 natural sciences Anthropogenic Food web Habitat Species evenness Environmental science Mediterranean stream Species richness Periphyton |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 19 páginas.- 5 figuras.- 2 tablas.- referencias.- Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-020-04263-5) contains supplementary material, which is available to authorized users. Anthropogenic impact can alter food web structure through changes in species interactions. In this study, we explored the food web of three Mediterranean stream reaches (two seasonal and one permanent) along an anthropogenic impact gradient to test the hypothesis that increasing impact simplifies food webs. To test this, we applied the isotopic (δ13C and δ15N) niche concept to compare reaches using isotopic metrics (isotopic richness, divergence, dispersion, evenness, and redundancy). The isotopic indices were useful to identify differences in food web architecture among the three reaches. The least impacted site had the highest isotopic richness, dispersion, and isotopic redundancy, suggesting higher ecological resilience at this site. The effect of disturbance in the remaining two sites was masked by the presence of invasive crayfish, which increased isotopic divergence and was responsible for higher food-chain length in the most impacted reach, but not in the moderately impacted reach. Consumers displayed generalistic feeding habits, with Bayesian mixing models indicating that they relied primarily on a mixture of periphyton, other macroinvertebrates, and to a lesser extent, detritus. Some taxa displayed changes in their dietary habitats depending on the site, indicating that the same type of taxa fed on distinct foods at each stream reach. The following work was a part of the IMPACT project funded by Foundation for Science and Technology (FCT) of Portugal (ERA558IWRM/0003/2009) |
| Databáze: | OpenAIRE |
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