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A quarter-century of variation in sponge abundance and community structure on shallow reefs in St. John, US Virgin Islands

机译:美国维尔京群岛圣约翰浅礁的海绵丰富与社区结构的四分之一世纪

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摘要

This study tested the hypothesis that sponge assemblages on the reefs of St. John, US Virgin Islands (18.315 degrees N, 64.716 degrees W), changed from 1992 to 2017. Sponges were identified to species or genus in photoquadrats and were quantified at 2-3 y intervals by density, with linear dimensions used to estimate volume as a proxy for biomass. From 1992 to July 2017, overall sponge density (pooled among taxa) increased, although trends varied among the most common species for which density increased (four species), decreased (one species), or showed no linear relationship with time (2 species). Hurricanes Irma and Maria caused a 51% decline in overall sponge density from July to November 2017, with density in November 2017 being 31% lower than in 1992. For the common sponges, densities of 6 declined by 82-100% between July and November 2017, but densities in November 2017 were 13-736% higher than in 1992 for four species, and 47-100% lower than in 1992 for 3 species. Sponge volume did not change linearly between 1992 and November 2017, but it was reduced by 54% following the hurricanes. Multivariate variation over time in benthic community structure was not strongly associated with sponge density alone, although a significant association with rainfall highlighted the potential roles of this environmental factor in directly, or indirectly, mediating changes in community structure. Overall, the mean density of sponges, as well as most of the common sponge species, trended upwards prior to the hurricanes, but these trends reversed following the storms.
机译:这项研究测试了美国维尔京群岛圣约翰礁石上的假设(18.315度,64.716摄氏度),从1992年到2017年发生变化。海绵被鉴定为光电子群岛的种类或属,并在2- 3 Y间隔通过密度,线性尺寸用于估计体积作为生物质的代理。从1992年到2017年7月,总线密度(在分类群中汇集)增加,尽管最常见的趋势在密度增加(四种),减少(一种物种)或显示没有与时间的线性关系(2种) 。飓风IRMA和玛丽亚在2017年7月至11月造成了51%的整体海绵密度下降,2017年11月的密度低于1992年的31%。对于普通海绵,6月至11月期间的密度下降了82-100% 2017年,但2017年11月的密度比1992年高于1992年的4种,比1992年低于1992年的3种。海绵卷不会在1992年至2017年11月之间线性改变,但飓风后,它减少了54%。随着海绵密度的多变量随着时间的推移,单独与海绵密度强烈相关,尽管与降雨的重大关联强调了这种环境因素直接或间接地调解社区结构的变化的潜在作用。总体而言,海绵的平均密度以及大多数常见的海绵物种,在飓风之前向上趋势,但这些趋势在暴风雨之后逆转。

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  • 来源
    《Marine biology》 |2020年第9期|135.1-135.17|共17页
  • 作者单位

    Calif State Univ Northridge Dept Biol 18111 Nordhoff St Northridge CA 91330 USA;

    Calif State Univ Northridge Dept Biol 18111 Nordhoff St Northridge CA 91330 USA;

    Florida State Univ Dept Biol Sci 319 Stadium Dr Tallahassee FL 32306 USA;

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