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首页> 外文期刊>Marine ecology progress series >Influence of different volumes and types of detached macrophytes on fish community structure in surf zones of sandy beaches
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Influence of different volumes and types of detached macrophytes on fish community structure in surf zones of sandy beaches

机译：沙滩冲浪区不同种类和种类的离生水生植物对鱼类群落结构的影响

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摘要

Detached macrophytes (seagrass and macroalgae) are transported from more offshore areas and accumulate in substantial volumes in surf zones, where they are commonly called wrack. Fishes were sampled using seine nets in 4 volume categories of detached macrophytes (bare sand, low, medium and high volumes) in the surf zone at 2 sandy beaches in southwestern Australia to determine how increasing volumes of surf-zone wrack influences fish community and size composition. Species composition and densities of fish, which were dominated by juveniles, differed between areas where wrack was present or absent, and also among volumes of wrack in the surf zone. Total fish abundance and biomass increased as the volume of wrack increased. Cnidoglanis macro-cephalus and Pelsartia humeralis were the dominant species and were most abundant in medium and high wrack volumes. Fish gut contents were analysed for C. macrocephalus and P. humeralis, and verified that Allorchestes compressa is a major prey item for juveniles of these species. A series of habitat preference trials conducted in outdoor aquaria tested whether juvenile C. macrocephalus and P. humeralis showed a preference for different types of detached macrophytes as a habitat, i.e. sea-grass, brown algae, or a mixture of both macrophyte types. Non-parametric goodness-of-fit binomial tests for differences in the number of fish between each habitat type showed no clear pattern in habitat preference for either species of fish. Field and laboratory results suggest that the amount, rather than type, of detached macrophytes is more important in providing a habitat for juvenile C. macrocephalus and P. humeralis.
机译：分离出的大型植物（海草和大型藻类）是从更多的近海地区运来的，并大量堆积在冲浪区，这些地区通常被称为残骸。在澳大利亚西南部2个沙滩的冲浪区中，使用围网对4个体积类别的分离的大型植物（裸露的沙子，低，中和高体积）进行了鱼类采样，以确定增加的冲浪区对鱼类群落和大小的影响组成。鱼的种类组成和密度以幼鱼为主，在存在或不存在残骸的区域之间以及在冲浪区残骸的数量之间，鱼类的种类组成和密度都不同。随着残骸数量的增加，鱼的总丰度和生物量增加。 Cnidoglanis macrocephalcephalus和Pelsartia humeralis是优势种，在中，高失稳体积时数量最多。对鱼的肠内容物进行了C. macrocephalus和P. humeralis的分析，并证实了Allorchestes compressa是这些种类幼鱼的主要猎物。在室外水族箱中进行的一系列栖息地偏好试验测试了少年C. macrocephalus和Humeralis是否表现出对不同类型的分离大型植物作为栖息地的偏好，即海草，褐藻或两种大型植物的混合物。对于每种生境类型之间鱼的数量差异的非参数拟合优度二项式检验表明，对于这两种鱼，生境偏好都没有明确的模式。野外和实验室结果表明，分离的大型植物的数量而不是类型，对于为少年大头金龟和肱骨假单胞菌提供栖息地更为重要。

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