Evolutionary mechanisms and diversity in a western Indian Ocean center of diversity
نویسنده
چکیده
The biogeography and evolutionary history of the shallow marine fauna in the western Indian Ocean (WIO) is poorly known, as are the consequences of ancient and recent biodiversity-generating processes. Inwater surveys of scleractinian corals show maximum diversity in a core region centered on the northern Mozambique Channel. Maximum species richness is at ≈300 with a threshold of ≈250 that differentiates this core region from lower-diversity zones in northern Tanzania and Kenya, the Seychelles and small islands in the Mozambique channel, and the Mascarene islands. Species distributions show significant clustering of sites within this high diversity core region, distinguished from peripheral regions. A heritage of ancient Tethyan lineages is suggested by the distinctive WIO endemic fauna of monospecific genera, basal Acropora clades, and cryptic phylogenetic patterns in Stylophora and Siderastrea. Their presence in the WIO is likely associated with the closure of the Tethys Sea in the Miocene and little radiation subsequently. The dominance (90%) of IndoWest Pacific species in the extant WIO coral fauna reflects invasion during the Mio-Pliocene of the younger and more diversified fauna from the West Pacific during the same period. Various lines of evidence suggest the northern Mozambique Channel may have been a refuge for shallow tropical species throughout its history, particularly during the Cenozoic. This deep evolutionary history suggests a unique biodiversity across multiple taxonomic levels in this second peak of tropical marine biodiversity.
منابع مشابه
Research Article: Zooplankton abundance and diversity in the ballast water of ships, Shahid Rajaee Port, Persian Gulf, Hormozgan, Iran
In the present study, the ballast waters from 24 ships arriving at Shahid Rajaee Port in Bandar Abbas, Hormozgan Province, Iran, were studied in two warm and cold seasons (summer 2017 and winter 2018). The zooplankton sampling was conducted under the MEPC 173(58) method, by bucket and using a 50-micron mesh to filter 300 liters of ballast water. In total, 57 zooplankton species, belonging to 8 ...
متن کاملShape variation of the Indian Ocean slender mudskipper, Scartelaos tenuis (Day, 1876) from the Persian Gulf and Oman Sea (Gobioidei: Gobiidae)
The shape diversity among populations of Scartelaos tenuis (Day 1876) from five stations (194 specimens) in the Persian Gulf, Strait of Hormuz (Qeshm Island), and the Sea of Oman were investigated. The shape variation was assessed by geometric morphometrics, using 14 morphological landmarks. The two sexes were not distinguishable by the shape. Fish samples were classified into two distinct grou...
متن کاملDistribution Modeling of Bigeye Tuna (Thunnus obesus Lowe, 1839), Using Satellite Derived Environmental Variables in Indian Ocean
Understanding effects of environment on the distribution of economic fish is a fundamental step in the ecosystem-based management and ultimately a standard approach in management policies. Bigeye tuna (Thunnus obesus) is one of the most important aquatic species harvested in the Indian Ocean. The present study investigated the association of different variables effecting the rate of catch and d...
متن کاملEvaluation of genetic diversity of Avicenniaceae family in Indian sundarban by using RAPD and ISSR markers
The present investigation was undertaken to describe the relationships among species of Avicenniaceae family which have both economic and medicinal activities, collected in Indian Sundarban by the help of RAPD and ISSR markers. In this study, three different species of Avicennia genus were collected. Frozen young leaves (-200C) were taken to isolate the genomic DNA using a slightly modified CTA...
متن کاملEvolutionary features of 8K (KDa) silencing suppressor protein of Potato mop-top virus
The cysteine-rich 8K protein of Potato mop-top virus (PMTV) suppresses host RNA silencing. In this study, evolutionary analysisof 8K sequences of PMTV isolates was studied on the basis of nucleotide and amino acid sequences. Twenty-one positively selected sites were identified in 8K codingregions. Recombination events were found in the 8K of PMTV isolates with a rate of 1.8. Totally 30 haplotyp...
متن کامل