(1999) are still waters dammed in depressions and cavities without direct communication with the sea. In this environment, tide pools can be formed during low tides, which according to Zander et al. Intertidal zones are highly variable environments due to the action of tides and nycthemeral and seasonal variations, where inhabitants are subject to temperature and salinity variations, desiccation and hypoxia conditions ( Horn et al. An example of this is Macrobrachium amazonicum (Heller 1862), a species with great plasticity whose populations widely inhabit Amazon estuaries and can also be exclusively a freshwater species. Some species of freshwater shrimps ( Macrobrachium) also need to spend part of their life cycle in estuaries, since the larvae develop in brackish water (salinity from 12 to 16) until they reach the juvenile stage, when they initiate the migration to fresh water, where they become adults, sexually mature and ready for mating (SEBRAE/ES 2005). Sexual maturity is usually complete in the sixth month, when the individuals are ready for mating and complete their life cycle ( Vinatea 2004). kroyeri spend about four months in estuarine environments ( Martinelli 2005) and then return to the sea. Marine shrimps Farfantepenaeus subtilis, Litopenaeus schmittiand X. During the juvenile phase (post-larvae), they make use of marine currents and occupy these food-rich areas to ensure growth. Some marine shrimps, specially Penaeidae family, are examples of temporary estuarine species. Palavras-Chave: hábitat densidade biomassa DecapodaĮstuaries are places to which many species migrate for reproduction or for developing stages of their life cycle and where many others species are residents. O pH e a temperatura foram os descritores ambientais mais importantes que afetaram significativamente a densidade e a biomassa dos camarões. surinamicum ocorreu no afloramento rochoso e marisma e M. pontederiae ocorreram nos três habitats, enquanto que M. ![]() Foi capturado um total de 4.871 indivíduos, distribuídos em três famílias e quatro espécies: Farfantepenaeus subtilis (marinha) a mais frequente (98,36%), seguida de Alpheus pontederiae (0,76%) (estuarina), Macrobrachium surinamicum (0,45%) e Macrobrachium amazonicum (0,43%) predominantemente dulcícolas. Em cada ambiente foram registrados os fatores físicoquímicos (pH, salinidade e temperatura) e mensuradas a área (m 2) e o volume (m 3) de cada poça através da técnica de batimetria. As coletas foram realizadas em agosto e novembro de 2009, na maré baixa de sizígia na praia do Areuá, situada na RESEX Mãe Grande de Curuçá, Pará, totalizando 20 poças. O presente trabalho investigou a ocupação e a correlação da abundância de camarões em relação às variáveis ambientais nos diferentes habitats (manguezal, marisma e afloramento rochoso) em um estuário amazônico. Key words: habitat density biomass Decapoda Temperature and pH were the most important environmental descriptors that significantly affected the density and biomass of shrimps. surinamicum occurred in salt marsh and rocky outcrop and M. pontederiae occurred in the three habitats, whereas M. We caught a total of 4,871 shrimps, distributed in three families and four species: Farfantepenaeus subtilis (98.36%) (marine) followed by Alpheus pontederiae (0.76%) (estuarine), Macrobrachium surinamicum(0.45%) and Macrobrachium amazonicum(0.43%) predominantly freshwater. In each environment, we recorded the physical-chemical factors (pH, salinity, and temperature) and measured the area (m 2) and volume (m 3) of every pool through bathymetry. The collections were made in August and November 2009, at low syzygy tide on Areuá Beach, situated in the Extractive Reserve of Mãe Grande de Curuçá, Pará, Brazil totaling 20 pools. The present work investigated the occupation and the correlation of the shrimp abundance in relation to environmental variables in different habitats (mangroves, salt marshes and rocky outcrops) in an Amazon estuary.
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