INVESTIGADORES
ZILLI florencia Lucila
artículos
Título:
Bidirectional exchanges of benthic invertebrates in a large river-floodplain system (Paraná River, Argentina).
Autor/es:
MESA LETICIA; MARCHESE MERCEDES ROSA; MONTALTO L; ZILLI FLORENCIA
Revista:
ANNALES DE LIMNOLOGIE-INTERNATIONAL JOURNAL OF LIMNOLOGY
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2012 p. 425 - 436
ISSN:
0003-4088
Resumen:
The flood pulse regime and the hydrological connectivity determine the lateral bidirectional exchangesof water, chemical compounds, and biota between the river and the floodplain habitats. The primarygoal of the present research was to analyze the effect of water flow on macroinvertebrates in two water levelsin a lateral connectivity gradient, from the main channel through a connection channel to a permanently connectedlake. We tested the hypothesis that the water flow from the main channel to the floodplain habitatsduring high water level causes a decrease in beta diversity between the sites, increasing similarity in the system.To test this hypothesis, we sampled a river?floodplain?lake system of the Middle Parana´ River duringtwo water levels, and analyzed the spatial and temporal turnover of species between sites and habitats. Localphysical characteristics, such as depth, benthic particulate organic matter, and grain size of bottom sedimentsinfluenced assemblage composition. Taxa richness, density, and Shannon diversity differed among habitatswithin the river?lake system, but did not show significant differences between water levels. Richness, density,and diversity were higher in the lake and the connection channel than in the Parana´ River bank. Beta diversitywas significantly higher during high water period. During low water period, benthic assemblage compositionwas homogenized, as reflected by the lower values of species turnover between the sites situated in themain channel?lake corridor during this phase. The lateral bidirectional exchanges among the habitats areessential for maintaining the specific invertebrate diversity of large river corridors.