The systematics of Lobophora (Dictyotales, Phaeophyceae) in the western Atlantic and eastern Pacific oceans: eight new species
The systematics of Lobophora (Dictyotales, Phaeophyceae) in the western Atlantic and eastern Pacific oceans: eight new species
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DOI：
10.1111/jpy.12850
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发表时间：
2019-06-01
影响因子：
2.9
通讯作者：
Fredericq, Suzanne
中科院分区：
文献类型：
--
作者：
Camacho, Olga;Fernandez-Garcia, Cindy;Fredericq, Suzanne
loophora是一种常见的热带到温带的褐藻属，存在于大量的栖息地，包括浅水和深水珊瑚礁、岩石海岸、红树林、海草床和rhodoliths床。最近的分子研究表明，麻属植物的物种多样性被严重低估了。目前对物种数量的估计在100到140种之间，建议在印度太平洋中部的多样性中心。利用3种分子标记（cox3、rbcL、psbA）、不同的单标记物种划分方法（GMYC、ABGD、PTP）和形态学证据，对西大西洋和东太平洋的Lobophora物种多样性进行了评价。Cox3提供了最多的主要物种假说（PSH）， rbcL次之，psbA次之。GMYC的物种划分分析最保守，其次是PTP，最后是ABGD。最具诊断性的形态学特征是髓质和背/腹侧皮层的菌体厚度和细胞层数。根据共识方法，在西大西洋鉴定出14种不同的Lobophora物种，在东太平洋鉴定出5种。本文描述了来自这两个海洋的8个新种：L. adpressa sp. nov、L. cocoensis sp. nov、L. columbiana sp. nov、L. crispata sp. nov、L. delicata sp. nov、L. dispera sp. nov、L. panamensis sp. nov和L. tortugensis sp. nov。研究表明，确定loophora物种的最佳方法是分析DNA序列（最好是cox3和rbcL），然后进行比较形态学和地理鉴定。
Lobophora is a common tropical to temperate genus of brown algae found in a plethora of habitats including shallow and deep-water coral reefs, rocky shores, mangroves, seagrass beds, and rhodoliths beds. Recent molecular studies have revealed that Lobophora species diversity has been severely underestimated. Current estimates of the species numbers range from 100 to 140 species with a suggested center of diversity in the Central Indo-Pacific. This study used three molecular markers (cox3, rbcL, psbA), different single-marker species delimitation methods (GMYC, ABGD, PTP), and morphological evidence to evaluate Lobophora species diversity in the Western Atlantic and the Eastern Pacific oceans. Cox3 provided the greatest number of primary species hypotheses(PSH), followed by rbcL and then psbA. GMYC species delimitation analysis was the most conservative across all three markers, followed by PTP, and then ABGD. The most informative diagnostic morphological characters were thallus thickness and number of cell layers in both the medulla and the dorsal/ventral cortices. Following a consensus approach, 14 distinct Lobophora species were identified in the Western Atlantic and five in the Eastern Pacific. Eight new species from these two oceans were herein described: L. adpressa sp. nov., L. cocoensis sp. nov., L. colombiana sp. nov., L. crispata sp. nov., L. delicata sp. nov., L. dispersa sp. nov., L. panamensis sp. nov., and L. tortugensis sp. nov. This study showed that the best approach to confidently identify Lobophora species is to analyze DNA sequences (preferably cox3 and rbcL) followed by comparative morphological and geographical assessment.