Influence of the North Equatorial Current on the population genetic structure of Tridacna crocea (Mollusca: Tridacnidae) along the eastern Philippine seaboard

Ravago-Gotanco, Rachel; Magsino, Richard M.; Juinio‐Meñez, Marie Antonette

doi:10.3354/meps336161

Cited by 41 publications

(40 citation statements)

References 25 publications

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“…In other words, geographical isolation is not the factor in structuring biogeographical gradients of genetic diversity in S. thunbergii . As expected, homogeneous populations in the NWP driven by oceanic currents have also been reported in marine invertebrates from that area, such as the clam Tridacna crocea (Ravago‐Gotanco et al ., ), the crab Clistocoeloma sinense (Yuhara et al ., ) and the snail Batillaria attramentaria (Ho et al ., ). Sargassum thunbergii populations along the Japan‐Pacific side are characterized by extremely low genetic differentiation (ITS2: F ST = −0.04 to 0.01; cox 3: F ST = 0.00–0.06), which can be ascribed to the interactive coastal hydrodynamic systems (Fujikura et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Oceanic currents drove population genetic connectivity of the brown alga Sargassum thunbergii in the north‐west Pacific

Gao

et al. 2016

Journal of Biogeography

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Aim Oceanic currents are among the most pervasive hydrodynamic features in shaping community dynamics, population connectivity and phylogeographical structure of intertidal species. Here, we test whether population structure and biogeographical gradients of genetic diversity in the brown alga Sargassum thunbergii are correlated with oceanic currents in the north-west Pacific (NWP).Location North-west Pacific (25.07°N-43.36°N).Methods Nuclear internal transcribed spacer-2 and mitochondrial cox3 sequences were obtained from 835 and 810 individuals of S. thunbergii respectively. Parsimony networks and phylogenetic trees (maximum parsimony and Bayesian inference) were constructed to evaluate phylogeographical structure. Pairwise F ST estimates and analyses of molecular variance (AMOVA) at various hierarchical levels (latitude, longitude, marine provinces, biogeographical basins and zoogeographical zones) were conducted to elucidate population genetic differentiation. migrate software was used to estimate the number of migrants between adjacent populations.Results Several lines of evidence indicate that S. thunbergii is characterized by shallow population structure. Geographical distances do not correlate with population pairwise genetic differentiations. The corridor/stepping-stone model-based coalescent analyses reveal high levels of asymmetric gene flow among S. thunbergii populations, with the numbers of migrants largely corresponding to the directions of oceanic current systems in the NWP. Genetic signatures also indicate that Jeju Island, Korea might act as a transition zone for dispersal of S. thunbergii in the NWP driven by the Kuroshio Current, thus facilitating subsequent transportation northward into the Sea of Japan and the Yellow-Bohai Sea.Main conclusions Population genetic homogeneity in S. thunbergii was mainly structured by oceanic currents rather than palaeoclimatic events. Our study illustrates an important phylogeographical case of how coastal hydrodynamic factors contributed to population connectivity and geographical shifts of genetic diversity for marine organisms without a pelagic stage.

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Section: Discussionmentioning

confidence: 99%

Oceanic currents drove population genetic connectivity of the brown alga Sargassum thunbergii in the north‐west Pacific

Gao

et al. 2016

Journal of Biogeography

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“…Conversely, results from giant clam genetic studies have indicated restricted gene flow, suggesting lower levels of exchange [17], [18]. Ocean current patterns have been invoked to explain such genetic divergences among marine invertebrate populations [19], as they can influence temporal and spatial physical processes that potentially restrict larval dispersal and gene flow [20], [21].…”

Section: Introductionmentioning

confidence: 99%

Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population—A dispersal model approach

et al. 2013

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Recruitment constraints on Singapore's dwindling fluted giant clam, Tridacna squamosa, population were studied by modelling fertilisation, larval transport, and settlement using real-time hydrodynamic forcing combined with knowledge of spawning characteristics, larval development, behaviour, and settlement cues. Larval transport was simulated using a finite-volume advection-diffusion model coupled to a three-dimensional hydrodynamic model. Three recruitment constraint hypotheses were tested: 1) there is limited connectivity between Singapore's reefs and other reefs in the region, 2) there is limited exchange within Singapore's Southern Islands, and 3) there exist low-density constraints to fertilisation efficacy (component Allee effects). Results showed that connectivity among giant clam populations was primarily determined by residual hydrodynamic flows and spawning time, with greatest chances of successful settlement occurring when spawning and subsequent larval dispersal coincided with the period of lowest residual flow. Simulations suggested poor larval transport from reefs located along the Peninsular Malaysia to Singapore, probably due to strong surface currents between the Andaman Sea and South China Sea combined with a major land barrier disrupting larval movement among reefs. The model, however, predicted offshore coral reefs to the southeast of Singapore (Bintan and Batam) may represent a significant source of larvae. Larval exchange within Singapore's Southern Islands varied substantially depending on the locations of source and sink reefs as well as spawning time; but all simulations resulted in low settler densities (2.1–68.6 settled individuals per 10,000 m2). Poor fertilisation rates predicted by the model indicate that the low density and scattered distribution of the remaining T. squamosa in Singapore are likely to significantly inhibit any natural recovery of local stocks.

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“…crocea throughout Wallacea using mitochondrial (mtDNA) markers [24][25][26], allozymes [27,28], and microsatellites [29]. Both T. crocea and T. maxima have been shown to contain distinct mtDNA clades associated with Sumatra (Sunda), Wallacea, and northwest New Guinea (Sahul, particularly in Cenderawasih Bay) [24][25][26].…”

Section: Discussionmentioning

confidence: 99%

Seascape genetics of Indo-Pacific reef organisms: methodologies and case studies for an emerging discipline

Liggins¹

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Which factors shape population connectivity and the consistency of their influence across species and seascapes is largely unresolved. This thesis takes a comparative genetic approach to investigate the influences of seascape topology (past sea level changes, contemporary oceanography, and geography) and species biology on the genetic connectivity among coral reefs around Australia, the Indo-Australasian Archipelago (IAA), and the wider Indo-Pacific. I focus on a suite of common, codistributed coral reef fishes and invertebrates that differ in life history characteristics. In the introductory chapter of my thesis I discuss population connectivity in marine systems, the contribution of seascape genetics to marine population connectivity research, and the state of our knowledge in the Indian and Pacific Oceans (Chapter One). Chapters Two and Three review the field of seascape genetics and the methodologies used in seascape genetic studies, respectively. My empirical research (Chapters Four-Six) takes a broad, yet integrated approach to describe and understand the processes underlying seascape genetic patterns around Australia, the IAA, and the Indo-Pacific. First, I investigate historical spatial genetic (mitochondrial DNA, mtDNA) patterns and processes using a comparative, multi-species framework (Chapter Four). I extend typical methods of comparative phylogeography to include: a matrix comparison method that allows the quantitative characterization of spatial genetic patterns; and a multiple regression modeling approach to identify the processes underlying the spatial genetic patterns for each species. I find that despite being subjected to common geographic and seascape influences, spatial genetic patterns differ across four common coral reef fishes (Acanthurus triostegus, Dascyllus trimaculatus, Halichoeres hortulanus, Pomacentrus coelestis). Although species with similar dispersal potential (based on egg type and pelagic larval duration) have the most similar spatial genetic patterns, the seascape features and processes (e.g. previous landbridges and oceanographic distances) underlying the genetic patterns are not always shared among species. Second, I characterize the latitude-wide genetic patterns of one species (P. coelestis) and extend methods typically used in such investigations by borrowing concepts and measures more commonly used for analyses of community composition (Chapter Five). Genealogical analyses reveal that levels of population genetic diversity in the core of the species range are elevated by the co-occurrence of two cryptic clades. Furthermore, the application of partitioned -diversity measures and nestedness analyses reveal that differing demographic processes underlie the genetic patterns observed at the northern and southern latitudinal peripheries of the species range. Last, I focus on edge-of-range genetic patterns for two tropical echinoderm species (Acanthaster planci and Tripneustes gratilla) at a little-studied high latitude peripheral population, Kermadec Islands, New Zea...

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Influence of the North Equatorial Current on the population genetic structure of Tridacna crocea (Mollusca: Tridacnidae) along the eastern Philippine seaboard

Cited by 41 publications

References 25 publications

Oceanic currents drove population genetic connectivity of the brown alga Sargassum thunbergii in the north‐west Pacific

Oceanic currents drove population genetic connectivity of the brown alga Sargassum thunbergii in the north‐west Pacific

Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population—A dispersal model approach

Seascape genetics of Indo-Pacific reef organisms: methodologies and case studies for an emerging discipline

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