Aquatic invertebrate's distribution in a freshwater coastal lagoon of southern Brazil in relation to water and sediment characteristics

Abstract

Abstract:Aim: The objective of this study was to evaluate the influence of water and sediment characteristics on the abundance, richness and diversity of the benthic invertebrate community in Peri lagoon, a freshwater coastal lagoon located in central coast of Santa Catarina State; Methods: Samplings were performed in April, May and June 2009, in five different sites of Peri lagoon. The samples were taken with an EckmanBirge drag, totalizing 60 for the invertebrate community, and 45 for sediment. Water physicochemical variables were also measured. Environmental influences in benthic community have been measured using a Canonical Correspondence Analysis (CCA). Linear regressions were also plotted for main correlations; Results: A total of 5,535 specimens were collected, identified into 18 taxa. Tanaidacea was the most abundant representing 54% of relative abundance, followed by Diptera (23%), and Ostracoda (17%). The richest family was Chironomidae with 6 taxa. CCA results indicated positive correlation between Chaoborus and Stenocypris with local depth, and negative correlation between Odonata, Gastropoda, Cytheridella and Coleoptera with the finest grains of sediment, as well as between Tanaidacea, Lopescladius, Annelida and Nematoda with both organic matter (OM) content in sediment and local depth. Linear regression analysis demonstrated inverse relation of Tanaidacea in response to OM (y = 0.6 -0.62.OM) and sand (y = 0.6 -0.6.sand), and of Lopescladius in response to OM (y = 0.37 -0.41. OM) and sand (y = 0.37 -0.46.sand). The fact that Peri lagoon has no marine influence and has Tanaidacea as the most abundant taxa, a group not expected in freshwaters, gives to this lagoon a particular relevance among coastal lagoons. The study concluded that sediment characteristics and local depth are more significant than water variables in determining the benthic community structure in Peri lagoon, which varied in accordance with different local conditions.

Structure and diversity of fishes in a freshwater and coastal subtropical lagoon

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“…Despite the importance of this ecosystem, it is little studied. Of studies undertaken (Cardoso et al ., ; Hennemann & Petrucio, ; Lisboa et al ., ; J. S. Oliveira, unpubl. data; A. N. Penteado, unpubl.…”

Integrating three tools for the environmental assessment of the Pardo River, Brazil

“…It is well known that sediment deposition and decreased river depth are determinants of benthic community structure, being this factor more significant than water variables (Lisboa et al 2011). In the present study, the hydromorphological assessment was shown to be highly dependent on the presence of a riparian area, and the dense margin vegetation of the riparian zone prevented excess sediment deposition due to margin erosion (Tran et al 2010).…”

“…The low scores for the parameter sediment deposition observed in stretches #2, #3, #8, #9, #10, #11, and #12 (Fig. 3) were related to the formation of islands in the water body, which may affect the euphotic zone depths, resulting in a decrease in the diversity of benthic communities (Henry 2009;Lisboa et al 2011).…”

Water level decrease and increased water stability promotes phytoplankton growth in a mesotrophic subtropical lake

“…The regional climate is humid subtropical (Cfa, according to the Köppen climate classification), with stronger winds during the austral spring (September-November) (Fuentes et al 2013) and rainfall throughout the year, although more intense in the hottest periods (Hennemann and Petrucio 2011). The water intake system for supply purposes is configured for a mean flow of 0.2 m 3 s À1 (Lisboa et al 2011).…”