PPG - Ecologia e Evolução

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Navegando PPG - Ecologia e Evolução por Orientador(es) "Azevedo, Juliana de Souza [UNIFESP]"

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    Padrão do uso de habitat por Bagres estuarinos (Siluriformes, Ariidae): um estudo de caso no complexo estuarino-lagunar de Cananéia, SP, Brasil
    (Universidade Federal de São Paulo (UNIFESP), 2020-04-28) Morais, Igor Souza De [UNIFESP]; Azevedo, Juliana de Souza [UNIFESP]; Universidade Federal de São Paulo
    This study aims to investigate spatio-temporal dynamics of Ariíds Cathorops spixii (Cs) and Genidens genidens (Gg), in which the hypothesis was tested to verify if the groups of individuals of C. spixii have the same pattern of habitat use from the North and South Portions of the Cananeia Estuarine-Lagunar Complex (CELC). 196 specimens were collected, 96 of which were captured in the northern sector (Cs = 55 and Gg = 41) and the rest sampled in the southern sector (Cs = 100) of the CELC. Sampling was carried out in the winter period, in the years 2014, 2017 and 2018. The study evaluated in integrated manner variables such as the somatic indexes of fish (Allometric condition factor and Hepatosomatic index), growth parameters (age rings, longevity, performance, and growth rate), morphometry (height, weight, and length) and chemical composition of otoliths, focusing on Sr and Ba elements, detected using the WDFRX technique. In general, individuals of the species, C. spixii sampled in the southernmost point of the CELC presented a greater amount of age rings (AE) (AE = 5.51 ± 2.38), where greater in length (CT) and weight (PT) (CTsouth = 228 ± 82 and PTsouth = 159 ± 165) and showing better well-being (FCsouth = 1.092 ± 0.021). The individuals collected in the northernmost sector showed to be younger (AE = 3.29 ± 1.92), smaller in length and weight (CTnorth = 165 ± 54 and PTnorth = 59 ± 77), in addition to showing more active behavior (FC = 0.50 ± 0.078). The WDFRX technique was satisfactory for analyzing the elements Sr and Ba in whole otoliths. The analysis of the main components addressing the chemical composition of the otoliths, considering the elements Sr and Ba, showed variability in both the spatial and temporal approach and related to the stage of development of the fish (adults and juveniles/ sub-adults), showing that younger individuals inhabit the northernmost sector. The Sr element showed a greater relationship with C. spixii individuals with a longer lifetime captured in the south. Although the hydrobiogeochemical characteristics of the northern and southern sectors of CELC do not define it as environmental replicates, the biotic data obtained for C. spixii catfish in the present study indicate a sample unit, that is, a flow of individuals between sectors, based on the knowledge the pattern of habitat use of this species.