scholarly journals Seascape genetics of the spiny lobsterPanulirus homarusin the Western Indian Ocean: Understanding how oceanographic features shape the genetic structure of species with high larval dispersal potential

2018 ◽  
Vol 8 (23) ◽  
pp. 12221-12237 ◽  
Author(s):  
Sohana P. Singh ◽  
Johan C. Groeneveld ◽  
Michael G. Hart-Davis ◽  
Björn C. Backeberg ◽  
Sandi Willows-Munro
Keyword(s):  
Genetic Structure ◽  
Indian Ocean ◽  
Larval Dispersal ◽  
Western Indian Ocean ◽  
Dispersal Potential ◽  
Seascape Genetics

Evidence of genetic differentiation in cigar wrasse Cheilio inermis (Labridae) within the western Indian Ocean

Genome ◽  
2020 ◽  
Vol 63 (10) ◽  
pp. 493-502
Author(s):  
Sisanda Mayekiso ◽  
Gavin Gouws ◽  
Monica Mwale ◽  
Ofer Gon
Keyword(s):  
Indian Ocean ◽  
Genetic Differentiation ◽  
Larval Dispersal ◽  
Sequence Data ◽  
Allelic Diversity ◽  
Nuclear Gene ◽  
Western Indian Ocean ◽  
Parental Origin ◽  
Pelagic Larvae ◽  
Atpase 6

Patterns of genetic structure and connectivity of the monotypic cigar wrasse Cheilio inermis within western Indian Ocean (WIO) are poorly understood. Whether the species exists as a single panmictic population across the WIO is unclear. Sequence data were generated from two mitochondrial genes (cytochrome b and ATPase 6) and one nuclear intron (S7 intron I). High levels of haplotype and allelic diversity (h = 0.88–0.98; A = 0.95–0.98), along with low nucleotide diversities were observed across all markers. The pairwise ΦST values indicated differentiation of Tanga from the four WIO localities (Inhaca, Nosy Bé, Gazi, and Shimoni), as well as differentiation between the northernmost WIO localities. AMOVAs indicated high differentiation among defined locality groups, whereas nuclear gene analysis found little differentiation among groups. The observed genetic differentiation in C. inermis could be caused by oceanic barriers, and by limited larval dispersal with the pelagic larvae possibly settling near their parental origin and promoting differentiation.

scholarly journals Isolation by resistance across a complex coral reef seascape

2015 ◽  
Vol 282 (1812) ◽  
pp. 20151217 ◽  
Author(s):  
Luke Thomas ◽  
W. Jason Kennington ◽  
Michael Stat ◽  
Shaun P. Wilkinson ◽  
Johnathan T. Kool ◽  
...  
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Genetic Divergence ◽  
Larval Dispersal ◽  
Population Genetic ◽  
Spatial Genetic Structure ◽  
Spatial Scales ◽  
Genetic Data ◽  
Genetic Structure Of Populations ◽  
Seascape Genetics

A detailed understanding of the genetic structure of populations and an accurate interpretation of processes driving contemporary patterns of gene flow are fundamental to successful spatial conservation management. The field of seascape genetics seeks to incorporate environmental variables and processes into analyses of population genetic data to improve our understanding of forces driving genetic divergence in the marine environment. Information about barriers to gene flow (such as ocean currents) is used to define a resistance surface to predict the spatial genetic structure of populations and explain deviations from the widely applied isolation-by-distance model. The majority of seascape approaches to date have been applied to linear coastal systems or at large spatial scales (more than 250 km), with very few applied to complex systems at regional spatial scales (less than 100 km). Here, we apply a seascape genetics approach to a peripheral population of the broadcast-spawning coral Acropora spicifera across the Houtman Abrolhos Islands, a high-latitude complex coral reef system off the central coast of Western Australia. We coupled population genetic data from a panel of microsatellite DNA markers with a biophysical dispersal model to test whether oceanographic processes could explain patterns of genetic divergence. We identified significant variation in allele frequencies over distances of less than 10 km, with significant differentiation occurring between adjacent sites but not between the most geographically distant ones. Recruitment probabilities between sites based on simulated larval dispersal were projected into a measure of resistance to connectivity that was significantly correlated with patterns of genetic divergence, demonstrating that patterns of spatial genetic structure are a function of restrictions to gene flow imposed by oceanographic currents. This study advances our understanding of the role of larval dispersal on the fine-scale genetic structure of coral populations across a complex island system and applies a methodological framework that can be tailored to suit a variety of marine organisms with a range of life-history characteristics.

Estimating Connectivity Through Larval Dispersal in the Western Indian Ocean

2019 ◽  
Vol 124 (8) ◽  
pp. 2446-2459 ◽  
Author(s):  
Majambo Gamoyo ◽  
David Obura ◽  
Chris J. C. Reason
Keyword(s):  
Indian Ocean ◽  
Larval Dispersal ◽  
Western Indian Ocean

scholarly journals Population genetic structure and connectivity of the seagrass Thalassia hemprichii in the Western Indian Ocean is influenced by predominant ocean currents

2019 ◽  
Vol 9 (16) ◽  
pp. 8953-8964 ◽  
Author(s):  
Marlene Jahnke ◽  
Martin Gullström ◽  
Josefine Larsson ◽  
Maria E. Asplund ◽  
Said Mgeleka ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Indian Ocean ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Western Indian Ocean ◽  
Ocean Currents ◽  
Thalassia Hemprichii

scholarly journals Genetic connectivity of the reef fish Lutjanus kasmira at the scale of the western Indian Ocean

2012 ◽  
Vol 69 (5) ◽  
pp. 842-853 ◽  
Author(s):  
D. Muths ◽  
G. Gouws ◽  
M. Mwale ◽  
E. Tessier ◽  
J. Bourjea
Keyword(s):  
Genetic Structure ◽  
Indian Ocean ◽  
Genetic Differentiation ◽  
Marine Protected Areas ◽  
Western Indian Ocean ◽  
Genetic Connectivity ◽  
Marine Biodiversity ◽  
Mitochondrial Cytochrome ◽  
Mitochondrial Cytochrome B ◽  
Significant Genetic Structure

Examining the genetic structure of species allows an estimate of the level of evolutionary connectivity between localities; this information is important for marine biodiversity protection, in particular, for the delineation of marine protected areas. In this context, a total of 601 Lutjanus kasmira (Forsskål, 1775) were sampled in 16 localities of the western Indian Ocean and analyzed with both mitochondrial cytochrome b sequencing and eight microsatellite loci genotyping. Both genetic markers indicate that differentiation was not significant even between samples separated by more than 4000 km. This absence of genetic differentiation among samples was favored by ecological plasticity of the species and is now ensured by resultant high levels of dispersal. Nevertheless, some significant genetic structure was detected for the areas of Mauritius and Moroni, as well as within populations in all localities, which will have to be explained by additional studies on local processes.

Editorial Introduction

2020 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Editors of the JIOWS
Keyword(s):  
Nineteenth Century ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Late Nineteenth Century ◽  
Fourth Volume ◽  
History Of ◽  
The Indian Ocean ◽  
Complex Relationships ◽  
Indian Ocean World ◽  
Shed Light

The editors are proud to present the first issue of the fourth volume of the Journal of Indian Ocean World Studies. This issue contains three articles, by James Francis Warren (Murdoch University), Kelsey McFaul (University of California, Santa Cruz), and Marek Pawelczak (University of Warsaw), respectively. Warren’s and McFaul’s articles take different approaches to the growing body of work that discusses pirates in the Indian Ocean World, past and present. Warren’s article is historical, exploring the life and times of Julano Taupan in the nineteenth-century Philippines. He invites us to question the meaning of the word ‘pirate’ and the several ways in which Taupan’s life has been interpreted by different European colonists and by anti-colonial movements from the mid-nineteenth century to the present day. McFaul’s article, meanwhile, takes a literary approach to discuss the much more recent phenomenon of Somali Piracy, which reached its apex in the last decade. Its contribution is to analyse the works of authors based in the region, challenging paradigms that have mostly been developed from analysis of works written in the West. Finally, Pawelczak’s article is a legal history of British jurisdiction in mid-late nineteenth-century Zanzibar. It examines one of the facets that underpinned European influence in the western Indian Ocean World before the establishment of colonial rule. In sum, this issue uses two key threads to shed light on the complex relationships between European and other Western powers and the Indian Ocean World.

scholarly journals Factors influencing microbial mat composition, distribution and dinitrogen fixation in three western Indian Ocean coral reefs

2012 ◽  
Vol 47 (1) ◽  
pp. 51-66 ◽  
Author(s):  
Loïc Charpy ◽  
Katarzyna A. Palinska ◽  
Raeid M. M. Abed ◽  
Marie José Langlade ◽  
Stjepko Golubic
Keyword(s):  
Indian Ocean ◽  
Coral Reefs ◽  
Western Indian Ocean ◽  
Dinitrogen Fixation ◽  
Microbial Mat ◽  
Composition Distribution ◽  
Factors Influencing
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