How seasonality and anthropogenic impacts can modulate the structure of aquatic benthic invertebrate assemblages
| Autor: | M.L.B. Iwai, E. R. Ono, A. L. U. Melo, Maria Ines Bulgari Alves, Virginia Sanches Uieda |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Wet season geography geography.geographical_feature_category Ecology 010604 marine biology & hydrobiology Fauna Urbanization Species diversity 010603 evolutionary biology 01 natural sciences Environmental degradation Fecal coliform Animal ecology Benthic zone Aquatic insects Environmental science Species richness Brazilian stream Ecology Evolution Behavior and Systematics Riparian zone |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2018-12-11T17:32:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-04-01 We studied a benthic invertebrate assemblage of a stream that passes through pristine, rural, suburban and urban areas of a municipality located in southeastern Brazil to investigate a possible relationship between this assemblage structure and urbanization. The environmental variables and fauna structure were analyzed in a spatial and temporal scale, sampling the four sites in a dry and wet season. We found a clear spatial pattern, with higher similarity between sites from rural and suburban area that presented intermediate environmental characteristics. The pristine site showed in both seasons the lowest values of alkalinity and fecal coliform. On the other hand, the site located in the urban area showed the lowest concentration of dissolved oxygen and higher of suspended solids, ammonia and fecal coliform. The extreme values of these three variables occurred in the wet season, probably related to the high rainfall values. The benthic invertebrate fauna structure followed the same longitudinal and seasonal pattern found for the environmental variables. The site in urban area showed the lowest richness, diversity and evenness, with a dominance of two groups resistant to adverse environmental conditions (Oligochaeta and Orthocladiinae) and absence of more sensitive groups (Coleoptera, Ephemeroptera and Trichoptera). The increase drag of the substrate and associated invertebrates can be responsible for the lower abundance and richness observed in the wet season. The environmental variables that best defined the differentiation between sites (dissolved oxygen, organic suspended solids and fecal coliform) related directly to urbanization effects, like dump effluents and removal of riparian vegetation. Department of Zoology Unesp - Univ Estadual Paulista, C.P. 510 Department of Zoology Unesp - Univ Estadual Paulista, C.P. 510 |
| Databáze: | OpenAIRE |
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