Affiliation:
1. Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences (CAS), Sanya, 572000, China
Abstract
AbstractAccurate species delimitation is important, especially for endangered species. As one of the most conspicuous bivalve taxa, giant clams are threatened throughout their geographic range. Many phylogeographic studies have revealed strong population structure among giant clams in the Indo-Pacific, suggesting cryptic diversity within these species. However, less attention has been paid to their identification and delimitation. In this study, we assembled a comprehensive dataset of mitochondrial cytochrome c oxidase subunit I (COI) sequences for Tridacna species, focusing on new sequences from Hainan Island in the South China Sea and previously published ones from Japan, Taiwan, Singapore, the Philippines, Indonesia, Australia, the Solomon Islands and the Red Sea. Three nominal species, Tridacna crocea, T. squamosa and T. noae, were recognized at Hainan Island on the basis of distance-based DNA barcoding, with mean interspecific K2P distances of 10.6–24.7% for seven Tridacna species (T. crocea, T. squamosa, T. noae, T. maxima, T. mbalavuana, T. derasa and T. gigas). The most abundant species, T. noae, represents the first record of this species from Hainan Island. Using a combination of phylogenetic and DNA-based species delimitation analyses (automatic barcode gap discovery, generalized mixed Yule coalescent and Bayesian Poisson tree processes), we found strong support for a total of 13 operational taxonomic units (OTUs) for the seven nominal Tridacna species. These results, coupled with the fact that each OTU occupies different regions in the Indo-Pacific, strongly suggest multiple cryptic species of giant clams. Our findings point to the need for taxonomic revisionary work on giant clams throughout the Indo-Pacific; such work will have important conservation implications.
Funder
Hainan Province
Innovation Program of CAS
Hundred Talents Programme of CAS
Natural Science Foundation of Hainan Province
Cooperation projects of CAS
National Natural Science Foundation of China
Publisher
Oxford University Press (OUP)
Subject
Animal Science and Zoology,Aquatic Science
Reference62 articles.
1. Significance of new records of Tridacna squamosa Lamarck, 1819, in the Tuamotu and Gambier Archipelagos (French Polynesia);ANDREFOUET;Molluscan Research,2014
2. The magnitude of global marine species diversity;APPELTANS;Current Biology,2012
3. Genetic structure of giant clam (Tridacna maxima) populations in the West Pacific is not consistent with dispersal by present-day ocean currents;BENZIE;Evolution,1997
4. Cryptic species as a window on diversity and conservation;BICKFORD;Trends in Ecology & Evolution,2007
5. The distribution and status of giant clams (family Tridacnidae)–a short review;BIN OTHMAN;Raffles Bulletin of Zoology,2010
Cited by
11 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献