Pessoa L A, Paiva P C, Paranhos R, Freitas M A V, Echeverría C A
Laboratório de Pesquisas Costeiras e Estuarinas - LABCOEST, Universidade Federal do Rio de Janeiro - UFRJ, Ilha do Fundão, Av. Pedro Calmon, CEP 21941-596, Rio de Janeiro, RJ, Brasil.
Instituto Virtual Internacional de Mudanças Globais - IVIG, Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia - COPPE, Universidade Federal do Rio de Janeiro - UFRJ, Ilha do Fundão, Av. Pedro Calmon, CEP 21941-596, Rio de Janeiro, RJ, Brasil.
Braz J Biol. 2020 Apr-Jun;80(2):449-459. doi: 10.1590/1519-6984.216263.
Spatial and temporal distribution of two species of adult´s ostracods (Cyprideis sp. and Cyprideis salebrosa) were studied as a function of the rainfall patterns in the Guanabara Bay, Rio de Janeiro, Brazil. Samples were taken in ten stations, along six surveys representing three periods (Dry, Early and Late Rainy) for two years. Stations were nested in four areas (Outer, Central, EPA Guapimirim and Impacted). The bottom water (temperature, salinity, dissolved oxygen and oxygen saturation) were measured in each area to characterize the influence of seasonal variations by rainfall. Cyprideis sp. and Cyprideis salebrosa showed patterns distribution to seasonality/surveys (p = 0,002 and p <0,001, respectly). The spatial distribution of Cyprideis sp was significantly different areas studied (p <0.001) indicated well defined areas and distribution in along of the surveys. However, C. salebrosa showed homogeneous distribution in along of the areas within of each survey (p <0.001). Redundancy Analysis (RDA) for the two years evidenced environment preference of the Cyprideis sp. for areas with marine conditions (high influence for channel central) and C. salebrosa for brackish water (high influence of the rivers). This observation reinforces of the existence of areas created by the seasonality of pluviometric regime, a possible dispersion of the adult's ostracods and possibility the use with bioindicators.
研究了巴西里约热内卢瓜纳巴拉湾两种成年介形虫（Cyprideis sp.和Cyprideis salebrosa）的时空分布与降雨模式的关系。在两年内，沿着代表三个时期（干旱期、雨季早期和雨季晚期）的六次调查，在十个站点采集了样本。站点嵌套在四个区域（外海、中部、瓜皮米林环境公园管理局和受影响区域）。测量了每个区域的底层水（温度、盐度、溶解氧和氧饱和度），以表征降雨引起的季节变化的影响。Cyprideis sp.和Cyprideis salebrosa在季节性/调查中呈现出分布模式（分别为p = 0.002和p <0.001）。Cyprideis sp.的空间分布在所研究的区域中存在显著差异（p <0.001），表明在调查过程中有明确的区域和分布。然而，C. salebrosa在每次调查的各个区域内呈现出均匀分布（p <0.001）。对这两年的冗余分析（RDA）表明，Cyprideis sp.偏好海洋条件的区域（对航道中部影响较大），而C. salebrosa偏好咸淡水区域（河流影响较大）。这一观察结果强化了降雨模式季节性所形成的区域的存在、成年介形虫可能的扩散以及将其用作生物指标的可能性。
