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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sediment granulometry and salinity drive spatial and seasonal variability of an estuarine demersal fish assemblage dominated by juvenile fish
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Sediment granulometry and salinity drive spatial and seasonal variability of an estuarine demersal fish assemblage dominated by juvenile fish

机译：沉积物粒度和盐度驱动着以幼鱼为主的河口水下鱼类群的空间和季节变化

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摘要

Abiotic factors are known to structure estuarine fish communities; however, their effects on the ichthyofauna are not yet clear. The objective of this study was to evaluate abundance and composition, by species and size, of the demersal ichthyofauna in a Mexican Central Pacific lagoon, and correlate its spatial and seasonal variations with selected abiotic factors. Eight sampling campaigns were conducted in representative months of the dry and rainy seasons between April 2015 and February 2017. Salinity, temperature and sediment granulometry were recorded. A total of 10 093 individuals of 64 species were collected and measured for total length. Of the 22 most abundant species, 19 were mainly juveniles ( 50%). Diapterus brevirostris, Achirus mazatianus, Centropomus robalito and Lutjanus argentiventris comprised more than 80% of the total collection. PERMANOVA yielded significant differences in fish community composition between sites and months, and post hoc tests resulted in four homogenous, significantly different groups of sites based on fish assemblage composition. These groups of sites lie well ordered along a west-east axis inside the lagoon. Two well separated seasonal groups of months were defined, namely dry season (February, April) and rainy season (July, October). The spatial changes in abundance and composition of the fish fauna were primarily explained by the Site factor in a spatial scale, while the Month factor influenced to a lesser degree the community structure on a seasonal scale. Redundancy analysis showed the type of sediment, the bottom salinity and the organic matter content were highly correlated with the composition and abundance of ichthyofauna in the lagoon. One species group (dominated by D. brevirostris, C. robalito and A. mazatlanus) was found to be highly positively correlated with percentage of mud and organic matter but negatively correlated with bottom salinity. Another species group (dominated by Diodon holocanthus, Eucinostomus dowii, Sphoeroides armulatus and Chaetodon humeralis) was highly correlated with percentage of sand and bottom salinity. A high number of juveniles in the catches also validates the Barra de Navidad lagoon as a probable nursery area.
机译：已知非生物因素构成河口鱼类群落。然而，它们对鱼腥藻的作用尚不清楚。这项研究的目的是通过种类和大小，评估墨西哥中部太平洋泻湖中的鱼鳞鱼的丰富度和组成，并将其空间和季节变化与非生物因素相关联。在2015年4月至2017年2月的干旱和雨季的代表性月份进行了八次采样活动。记录了盐度，温度和沉积物粒度。总共收集了64种的10093个个体，并测量了总长度。在22个最丰富的物种中，有19个主要是幼鱼（> 50％）。短剑鱼（Diapterus brevirostris），马蹄莲（Achirus mazatianus），罗氏刺柏（Centropomus robalito）和长叶香椿（Lutjanus argentiventris）占总数的80％以上。 PERMANOVA在地点和月份之间在鱼类群落组成上产生了显着差异，事后测试根据鱼类的组成，得出了四个同质，显着不同的地点组。这些地点沿泻湖内的东西轴线排列得井井有条。定义了两个完全分开的季节月份组，分别是旱季（2月，4月）和雨季（7月，10月）。鱼群的丰度和组成的空间变化主要由空间尺度上的Site因子解释，而Month因子在较小程度上影响季节性尺度上的群落结构。冗余分析表明，沉积物的类型，底部盐分和有机质含量与泻湖鱼腥藻的组成和丰度高度相关。发现一个物种组（以短螺旋藻，罗氏梭状芽胞杆菌和玛氏曲霉为主导）与泥浆和有机质的百分比高度正相关，而与底部盐度负相关。另一个物种组（以大螯虾，Eucinostomus dowii，Sphoeroides armulatus和Chaetodon humeralis为主）与沙子和底部盐分的百分比高度相关。渔获量中的大量幼鱼也证实了巴拉德纳维达德泻湖是一个可能的苗圃地区。

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