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Ecology of the intertidal crab Dotilla intermedia from tsunami-impacted beaches in Thailand

机译:从泰国受海啸影响的海滩的潮间带蟹Dotilla intermedia的生态

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摘要

Crabs of the genus Dotilla are ecologically important members of intertidal sandy shorecommunities. Exposed sandy shores represent one of the main habitat types along the coast of theLaem Son National Park in Thailand, and Dotilla sp. is the dominant macrofaunal species onthese beaches, occurring in immense numbers. Despite their importance as a key member of thefaunal community on these beaches, little is known about the ecology of Dotilla crabs in theLaem Son. Taxonomic investigations identified the Dotilla crabs present on the exposed oceanicbeaches in the Laem Son to be D. intermedia. This represents the first time that D. intermedia hasbeen recorded from Thailand. Dotilla intermedia inhabits a very well defined zone on the sandybeaches, and the factors underlying these zonation patterns were examined. The gradient of thebeach was correlated to the height at which the boundaries of the Dotilla zone occurred, withphysical factors associated with the beach gradient driving the distribution of D. intermedia onthe beach. The upper limit of the Dotilla zone was controlled by the total water content of thesediment, with D. intermedia absent from areas with less than 15% total water content. Tidalinfluences defined the lower boundary of the Dotilla zone, with crabs requiring an area with aminimum exposure time between tidal immersions of 4-5 hours to feed on the sediment. Withinthe Dotilla zone, size segregation was observed; larger crabs occurred higher on the shore, andsmall crabs lower down. The sandy shores of the Laem Son were heavily impacted by thetsunami of 26th December 2004, which effectively destroyed the populations of D. intermedia onthe beaches. However, by April 2005 D. intermedia was present again on the beaches. Atemporal population genetic study was undertaken to investigate the impact of extinction andrecolonisation on the genetic variation of a population. Genetic variation in mtDNA markers wasfound to decrease over time, matching the predictions of mathematical models concerning theeffect of bottlenecking events on genetic diversity within populations. The impact of the tsunamion D. intermedia is discussed further in light of the ecological and molecular data produced inthis thesis.
机译:白头翁属的螃蟹是潮间带沙质海岸社区的重要生态成员。裸露的沙质海岸是泰国Laem Son国家公园和Dotilla sp。沿海的主要栖息地类型之一。是这些海滩上主要的大型动物种类,数量巨大。尽管它们在这些海滩上是动物群落的重要成员,但其对Laem Son的Dotilla蟹的生态知之甚少。分类学研究确定,在Laem Son中裸露的海洋沙滩上出现的白点蟹为中间缘D.。这是中间媒介D.media首次从泰国录制。中间白蚁栖息在沙滩上一个非常明确的区域,并对这些分区模式的影响因素进行了研究。海滩的坡度与Dotilla区域边界发生的高度相关,而与海滩坡度相关的物理因素驱动中间中介石藻在海滩上的分布。多蒂拉区的上限由这些沉积物的总含水量控制,总含水量少于15%的地区不存在中间D。泰达灵影响力定义了白点区的下边界,螃蟹需要在潮汐浸入之间的最小接触时间为4-5小时的区域,才能以沉积物为食。在Dotilla区域内,观察到尺寸偏析。较大的螃蟹在岸上较高,而小的螃蟹则在较低位置。 Laem Son的沙质海岸受到2004年12月26日海啸的严重影响,这有效地破坏了海滩上中间介石虫的种群。然而,到2005年4月,中间媒介D. intermedia再次出现在沙滩上。进行了暂时性种群遗传研究,以研究灭绝和重新定殖对种群遗传变异的影响。发现mtDNA标记的遗传变异随时间减少,与关于瓶颈事件对种群内遗传多样性的影响的数学模型的预测相符。根据本文所产生的生态和分子数据,进一步讨论了海藻对海藻的影响。

著录项

  • 作者

    Allen Christopher John;

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  • 年度 2010
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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