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Biodiversity of coastal polyclad flatworm assemblages in the wider Caribbean

机译：加勒比海沿岸多壳扁虫种群的生物多样性

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摘要

Polyclads are mobile predators and possibly an important functional component of hard substrate marine environments globally. To understand the natural patterns of spatial differences, polyclad assemblages were sampled in seven coastal regions across the wider Caribbean spanning 15° latitude and 24° longitude between May and June 2005 and May and September 2006. In total, 67 species in 28 genera and 17 families were recorded from 62 sites. Only two species were found in all surveyed regions, Melloplana ferruginea and Pseudoceros bicolor. Conversely, 41 species were restricted to one or two sites, and 34 species were represented by one or two individuals. The distribution and abundance of species varied between the two suborders. Cotyleans were most species rich and had a higher number of species of restricted range, while Acotylea showed a higher proportion of rare species; however, two species were highly abundant comprising over half of the individuals counted. In most habitats, polyclads were rare, but in some intertidal habitats two species, Styloplanocera fasciata and Boninia divae were densely aggregated and dominant members of the benthic epifauna. Alpha diversity was variable but showed no evidence of a relationship with latitude, longitude or depth. Beta diversity increased with the number of habitats sampled and was highest for cotyleans. Highest gamma diversity was recorded in Jamaica and the US Virgin Islands and was not significantly correlated to alpha diversity. Overall assemblages from the seven regions were similar, revealing faunal homogeneity across the wider region. Reef assemblages were distinct from other habitats dominated by species of the Cotylea. Reefs from Panama and the US Virgin Islands were the most species rich.
机译：Polyclad是可移动的掠食者，并且可能是全球硬质底物海洋环境的重要功能组件。为了理解空间差异的自然模式，在2005年5月至2006年6月至2006年5月至2006年9月之间，在横跨加勒比地区的15个纬度和24度经度的七个沿海地区取样了聚类组合。共计28个属和17个属的67种从62个地点记录了家庭。在所有调查区域中仅发现了两个物种，即铁皮苜蓿和双色假单胞菌。相反，有41种限制在一个或两个地点，而34种则由一个或两个个体代表。物种的分布和丰度在这两个亚阶之间有所不同。子叶植物是最丰富的物种，并且有更多的有限范围物种，而子叶植物则显示出更高比例的稀有物种。但是，两个物种高度丰富，占被计数个体的一半以上。在大多数生境中，多翼类动物很少见，但在一些潮间带生境中，有两个物种，即Styloplanocera fasciata和Boninia divae密集聚集，是底栖动物的主要成员。阿尔法多样性是可变的，但没有证据表明与纬度，经度或深度有关。 Beta多样性随着采样的栖息地数量的增加而增加，并且对于子叶动物而言，最高。牙买加和美国维尔京群岛记录到的伽马值最高，与阿尔法多样性没有显着相关性。七个地区的总体组合相似，揭示了整个地区的动物区系同质性。珊瑚组合不同于其他以Cotylea物种为主的栖息地。来自巴拿马和美属维尔京群岛的珊瑚礁是物种最多的。

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  • 来源
    《Marine biology》 |2008年第5期|p.769-778|共10页
  • 作者

    Kate A. Rawlinson;

  • 作者单位

    Department of Zoology, Rudman Hall, University of New Hampshire, Durham, NH 03824, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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