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首页> 外文期刊>Marine ecology progress series >On the very edge: faunal and functional responses to the interface between benthic seagrass and unvegetated sand assemblages
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On the very edge: faunal and functional responses to the interface between benthic seagrass and unvegetated sand assemblages

机译：最前沿：底栖海草与无植被沙体之间界面的动物和功能响应

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摘要

Changes in macrobenthic spatial structure were investigated across the precise 0.5 m wide boundary zone between intertidal seagrass and unvegetated sand in Moreton Bay, Queensland, Australia. Faunal abundance and species density in the marginal seagrass were only slightly reduced relative to local non-boundary areas. Although gradual diminution in seagrass faunal abundance occurred towards the interface and a few locally dominant species were absent from the boundary zone, most transition was far from gradual, instead being exactly coincident with the specific 0.1 m interface between the 2 habitats. Over this distance, faunal abundance and species density fell by 56 to 60% (from 1412 to 625 m(-2) and from an estimated 42 species per sampling horizon to 17, respectively). Dominant seagrass species were abundant right up to the interface itself, but their densities had fallen by 82% a further 0.1 m into the adjacent sand. Functional-group density and diversity mirrored these changes, decreasing over the same distance by 30 to 36%. Spatial analysis showed that adjacent cores along lattice sampling horizons, although spaced further apart, were more similar to each other than were those oriented across horizons, even though these were contiguous. Characteristic high animal species richness in the seagrass relative to adjacent sand appears to be not so much related to characteristics of the seagrass habitat as a whole rather than to the presence or absence of individual plants. Asymmetrically, distributions of species characteristic of the sand stopped somewhat in advance of the interface, leaving a marginal sand zone dominated by generalists occurring at equal (low) species and population density across both habitats.
机译：在澳大利亚昆士兰州莫顿湾的潮间带海草和无植被的沙子之间精确的0.5 m宽边界区域，调查了大型底栖动物空间结构的变化。相对于当地的非边界地区，边缘海草中的动物丰度和物种密度仅略有降低。尽管海草动物区系的丰度逐渐向界面减小，边界区域缺少一些本地优势物种，但大多数过渡远非循序渐进，而是与两个生境之间的特定0.1 m界面完全一致。在此距离上，动物群落的丰度和物种密度下降了56％至60％（从1412下降至625 m（-2），每个采样范围的估计物种有42种，分别下降到17种）。直到界面本身，主要的海草种类都非常丰富，但是它们的密度在邻近的沙子中又下降了82％，进一步降低了0.1 m。功能组的密度和多样性反映了这些变化，在相同距离上降低了30％至36％。空间分析表明，沿着晶格采样层级相邻的核，尽管彼此间隔更远，但彼此相比比跨层级的核更相似，即使它们是连续的。相对于邻近的沙土而言，海草中特征性的高动物物种丰富度似乎与海草生境整体上的特征并没有太大关系，而与单个植物的存在与否无关。不对称的是，沙的特征性物种分布在界面之前有所停止，留下了由多面手主导的边缘沙带，在两个生境中以相同（低）的物种和种群密度出现。

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  • 来源
    《Marine ecology progress series》 |2016年第14期|33-48|共16页
  • 作者

    Barnes R. S. K.; Hamylton S.;

  • 作者单位

    Univ Queensland, Sch Biol Sci, Brisbane, Qld 4072, Australia|Univ Queensland, Ctr Marine Sci, Brisbane, Qld 4072, Australia|Queensland Museum, Biodivers Program, Brisbane, Qld 4101, Australia;

    Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia;

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  • 正文语种 eng
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  • 关键词

    Benthos; Biodiversity; Ecotone; Edge effects; Sandflat; Seagrass;

    机译：Benthos;生物多样性;Ecotone;边缘效应;Sandflat;海草;

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