Highly restricted gene flow and deep evolutionary lineages in the giant clam <Emphasis Type="Italic">Tridacna maxima</Emphasis> |
| |
Authors: | A Nuryanto M Kochzius |
| |
Institution: | (1) Biotechnology and Molecular Genetics, FB2-UFT, University of Bremen, Leobenerstrasse UFT, 28359 Bremen, Germany;(2) Present address: Faculty of Biology, Jenderal Soedirman University, Purwokerto, Indonesia |
| |
Abstract: | The tropical Indo-West Pacific is the biogeographic region with the highest diversity of marine shallow water species, with
its centre in the Indo-Malay Archipelago. However, due to its high endemism, the Red Sea is also considered as an important
centre of evolution. Currently, not much is known about exchange among the Red Sea, Indian Ocean and West Pacific, as well
as connectivity within the Indo-Malay Archipelago, even though such information is important to illuminate ecological and
evolutionary processes that shape marine biodiversity in these regions. In addition, the inference of connectivity among populations
is important for conservation. This study aims to test the hypothesis that the Indo-Malay Archipelago and the Red Sea are
important centres of evolution by studying the genetic population structure of the giant clam Tridacna maxima. This study is based on a 484-bp fragment of the cytochrome c oxidase I gene from 211 individuals collected at 14 localities in the Indo-West Pacific to infer lineage diversification
and gene flow as a measure for connectivity. The analysis showed a significant genetic differentiation among sample sites
in the Indo-West Pacific (Φst = 0.74, P < 0.001) and across the Indo-Malay Archipelago (Φst = 0.72, P < 0.001), indicating restricted gene flow. Hierarchical AMOVA revealed the highest fixation index (Φct = 0.8, P < 0.001) when sample sites were assigned to the following regions: (1) Red Sea, (2) Indian Ocean and Java Sea, (3) Indonesian
throughflow and seas in the East of Sulawesi, and (4) Western Pacific. Geological history as well as oceanography are important
factors that shape the genetic structure of T. maxima in the Indo-Malay Archipelago and Red Sea. The observed deep evolutionary lineages might include cryptic species and this
result supports the notion that the Indo-Malay Archipelago and the Red Sea are important centres of evolution.
Communicated by Biology Editor Dr. Ruth Gates |
| |
Keywords: | Southeast Asia Arabian Seas Coral Triangle Conservation Marine protected areas Aquarium trade |
本文献已被 SpringerLink 等数据库收录! |
|