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首页> 外文期刊>Aquatic Biology >Biogeographical homogeneity in the eastern Mediterranean Sea. II. Temporal variation in Lebanese bivalve biota
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Biogeographical homogeneity in the eastern Mediterranean Sea. II. Temporal variation in Lebanese bivalve biota

机译：地中海东部的生物地理同质性。二。黎巴嫩双壳生物区系的时间变化

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ABSTRACT: Lebanon (eastern Mediterranean Sea) is an area of particular biogeographic significance for studying the structure of eastern Mediterranean marine biodiversity and its recent changes. Based on literature records and original samples, we review here the knowledge of the Lebanese marine bivalve biota, tracing its changes during the last 170 yr. The updated checklist of bivalves of Lebanon yielded a total of 114 species (96 native and 18 alien taxa), accounting for ca. 26.5% of the known Mediterranean Bivalvia and thus representing a particularly poor fauna. Analysis of the 21 taxa historically described on Lebanese material only yielded 2 available names. Records of 24 species are new for the Lebanese fauna, and Lioberus ligneus is also a new record for the Mediterranean Sea. Comparisons between molluscan records by past (before 1950) and modern (after 1950) authors revealed temporal variations and qualitative modifications of the Lebanese bivalve fauna, mostly affected by the introduction of Erythraean species. The rate of recording of new alien species (evaluated in decades) revealed later first local arrivals (after 1900) than those observed for other eastern Mediterranean shores, while the peak in records in conjunction with our samplings (1991 to 2010) emphasizes the need for increased field work to monitor their arrival and establishment. Finally, the scarce presence (or total absence) in the most recent samples of some once common habitat-forming species, as well as of some other native taxa, confirmed their recent rarefaction (or local extinction), possibly related to their replacement by the aliens Brachidontes pharaonis, Spondylus spinosus and Chama pacifica.
机译：摘要：黎巴嫩（地中海东部）对研究地中海东部海洋生物多样性的结构及其近期变化具有特殊的生物地理意义。基于文献记录和原始样本，我们在这里回顾黎巴嫩海洋双壳类生物群的知识，追踪其在过去170年中的变化。更新后的黎巴嫩双壳类清单产生了总共114种（96种本地生物和18种外来生物分类），约占总生物量的2倍。已知地中海双壳纲的26.5％，因此代表特别贫乏的动物。对历史上用黎巴嫩材料描述的21个分类单元的分析仅产生2个可用名称。黎巴嫩动物区系有24种新记录， Lioberus ligneus 也是地中海的新记录。通过比较过去（1950年之前）和现代（1950年之后）的软体动物记录，可以发现黎巴嫩双壳类动物区系的时间变化和质变，这主要是受引入赤藓物种的影响。新外来物种的记录速度（以十年为单位进行评估）显示，本地首次到达的时间（1900年之后）晚于其他东地中海沿岸，而与我们的抽样记录（1991年至2010年）一起达到的记录峰值则强调了加强实地工作，以监测他们的到来和建立。最后，一些曾经常见的形成栖息地的物种以及一些其他本地分类单元的最新样本中稀缺的存在（或完全不存在）证实了它们最近的稀疏（或局部灭绝），可能与它们的替代有关。外星人 Brachidontes pharaonis ， Spondylus spinosus 和 Chama pacifica 。

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