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Dynamics of the shark community in the Mid-Atlantic Bight

机译：大西洋中大西洋鲨鱼社区的动态

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摘要

Inventory biodiversity indices such as species richness, distribution of species' abundances or evenness in communities, and those that represent functional characteristics provide foundational information that can be used to formally evaluate the ecological role species fulfill within ecosystems. Describing changes in the dimensions of biodiversity relative to spatiotemporal and environmental gradients facilitates more refined and integrated views of community dynamics. This study synthesized fisheries-independent bottom longline survey data collected from 1990 to 2018 to elucidate patterns in six inventory biodiversity indices across temporal, small-scale spatial, and thermal domains for the shark community inhabiting the Mid-Atlantic Bight. Model-based predictions over years showed marked increases since the mid-2000s in several indices and were suggestive of an expanding community in terms of species richness, biodiversity, relative abundance, functional traits, and size composition. Annual relative evenness predictions were fairly constant and indicative of persistent maintenance in the distribution of community abundance across taxa through time. Changes in the biodiversity indices were also evident across a fairly small spatial area and in response to bottom water temperature, although patterns were less prominent when compared to interannual trends. The results of this study complement single-species population analyses by providing a community-level perspective, and offer positive indications that the shark community off the U.S. east coast has become more robust over the past several years.
机译：库存生物多样性指数，如物种丰富，物种分布，物种的分布或社区中的均匀度，以及代表功能特征的人提供了可用于正式评估生态系统在生态系统内实现的基础信息。描述相对于时空和环境梯度的生物多样性维度的变化有助于社区动态的更精细和综合视图。本研究综合渔业独立的底部延长线调查数据从1990年到2018年收集，以涉及跨大西洋中间偏出的鲨鱼群岛的春季，小型空间和热域中的六个库存生物多样性指数的模式。自2000年代中期以来，多年来，基于模型的预测显示出现了显着的增加，并在物种丰富，生物多样性，相对丰富，功能性状和尺寸组成方面提出了扩大社区。年度相对均匀性预测是相当不变的，表明通过时间通过分类群体的社区丰富分配持续维护。生物多样性指数的变化在相当小的空间区域和较低水温下也显而易见，尽管与际趋势相比，图案较小。本研究的结果补充了单一物种的人口分析，提供社区层面的观点，并提供了美国东海岸的鲨鱼社区在过去几年中变得更加强劲的积极迹象。

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  • 来源
    《Marine biology》 |2020年第7期|100.1-100.14|共14页
  • 作者

    Latour Robert J.; Gartland James;

  • 作者单位

    Virginia Inst Marine Sci POB 1346 Gloucester Point VA 23062 USA;

    Virginia Inst Marine Sci POB 1346 Gloucester Point VA 23062 USA;

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  • 正文语种 eng
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