Distribution of Noah’s giant clam, Tridacna noae

Borsa, Philippe; Fauvelot, Cécile; Tiavouane, Josina; Grulois, Daphné; Wabnitz, Colette C.C.; Naguit, Maria Rio Abdon; Andréfouët, Serge

doi:10.1007/s12526-014-0265-9

Cited by 33 publications

(32 citation statements)

References 17 publications

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“…Considering the recent revisions in giant clam taxonomy, a number of recorded densities for the small giant clam ( T. maxima ) are likely to include T. noae in its currently known distribution range including the Coral Triangle, Western Pacific and East Indian Ocean (Borsa et al . ). Therefore, the range of density among sites and countries reported in this study may be underestimated.…”

Section: Discussionmentioning

confidence: 97%

“…), is found throughout the Coral Triangle, Western Pacific and East Indian Ocean (Borsa et al . ). The taxonomical status and phylogeography of giant clams are also continuously revised.…”

Section: Introductionmentioning

confidence: 97%

“…Because of the likely long‐time confusion between the latter two species (nearly no shell characteristics distinguish them), recorded densities of the small giant clam ( T. maxima ) that we report on here likely include T. noae in its currently known distribution range (Borsa et al . ).…”

Section: Introductionmentioning

confidence: 97%

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Drivers of density for the exploited giant clam Tridacna maxima: a meta‐analysis

et al. 2015

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Giant clam populations have been over‐exploited throughout their range over the past decades for their meat and shells. Tridacna maxima, commonly known as the ‘small giant clam’, has remained relatively untargeted by fishers in areas where larger species occur (e.g. Tridacna squamosa), and high densities of the species are still observed on some isolated and enclosed reefs of the Central Pacific. However, it is unclear whether reported discrepancies in densities worldwide reflect differences in fishing pressure only or a combination of differences in exploitation levels and environmental forcing. We reviewed T. maxima surveys throughout its range to (i) identify patterns of density at global scale, site scale (e.g. island) and intrasite scale; (ii) discuss the influence of sampling method on density estimates; and (iii) identify the primary drivers of giant clam density along gradients of human pressure and natural forcing. We found 59 studies that reported density estimates for 172 sites across 26 countries in the Indo‐Pacific and Red Sea. At intrasite scale, densities were strongly dependent on sampling protocols and surveyed habitats. At site scale, we found close links between T. maxima density and human population per reef area, suggesting that isolated reefs where exploitation only recently started may be more vulnerable to stock collapse in the future. Density patterns were also found to vary significantly depending on reef type (e.g. atoll, island, continental coastline). We discuss how natural processes and fishing pressure may control population dynamics and densities among sites, and make recommendations for future research.

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Section: Discussionmentioning

confidence: 97%

“…), is found throughout the Coral Triangle, Western Pacific and East Indian Ocean (Borsa et al . ). The taxonomical status and phylogeography of giant clams are also continuously revised.…”

Section: Introductionmentioning

confidence: 97%

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Drivers of density for the exploited giant clam Tridacna maxima: a meta‐analysis

et al. 2015

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“…Panel (a) is usually taken to represent the range dynamics underlying Rapoport's rule. [44][45][46], and others have been broken into a few species, most with extensive latitudinal and longitudinal ranges [47,48].…”

Section: (C) Comparability Of Generamentioning

confidence: 99%

Unifying latitudinal gradients in range size and richness across marine and terrestrial systems

et al. 2016

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Many marine and terrestrial clades show similar latitudinal gradients in species richness, but opposite gradients in range size-on land, ranges are the smallest in the tropics, whereas in the sea, ranges are the largest in the tropics. Therefore, richness gradients in marine and terrestrial systems do not arise from a shared latitudinal arrangement of species range sizes. Comparing terrestrial birds and marine bivalves, we find that gradients in range size are concordant at the level of genera. Here, both groups show a nested pattern in which narrow-ranging genera are confined to the tropics and broad-ranging genera extend across much of the gradient. We find that (i) genus range size and its variation with latitude is closely associated with per-genus species richness and (ii) broad-ranging genera contain more species both within and outside of the tropics when compared with tropical-or temperate-only genera. Within-genus species diversification thus promotes genus expansion to novel latitudes. Despite underlying differences in the species range-size gradients, species-rich genera are more likely to produce a descendant that extends its range relative to the ancestor's range. These results unify species richness gradients with those of genera, implying that birds and bivalves share similar latitudinal dynamics in net species diversification.

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“…A recent attempt to characterise the range of this species used recognition of mantle patterns typical of Taiwanese individuals (four individauls) to extrapolate species identity from georeferenced photographs of wild clams (Borsa et al 2014). That these mantle patterns bear no resemblance to those of this species from western Australia (pers.…”

Section: Chapter 4)mentioning

confidence: 99%

Mapping within-species biodiversity: patterns and predictors of genetic diversity on Indo-Pacific reefs

Keyse¹

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The rate of biodiversity loss across the globe is alarming, suggesting a need to better understand the conditions favourable for generating biodiversity, especially in hyperdiverse regions. The shallow waters of the Indo-Pacific contain the highest concentration of tropical marine species on the planet; not surprisingly, the region has been the focus of extensive study by biogeographers since the 19th century. The Indian and Pacific Oceans border over 65 nations, of which 18 are classified by the UN as Least Developed Countries, with burgeoning human populations along their coastlines.These pressures make understanding the patterns and processes underlying the generation and maintenance of all levels of biodiversity a pressing need.Compared to species diversity, genetic diversity is rarely considered in conservation planning.Genetic diversity data are commonly published as studies of a single or few species, particularly phylogeographic or population genetic studies focusing on spatial patterns within species. Once published, however, these public data can be used to answer questions on a larger spatial scale than the scale of their constituent parts. In a quantitative, comparative framework, these data can be synthesised to address questions about the bewildering diversity of the Indo-Pacific by treating species as 'replicates'. Yet, use of these data carries certain caveats. In particular, data extraction requires significant time and often returns summary statistics rather than raw genetic data. This thesis explores the availability of such data for tropical marine fauna in the Indo-Pacific and makes use of it to examine patterns of genetic diversity at an oceanic scale.The first two chapters of this thesis use publicly available data from 108 studies for 116 species of marine fauna in the tropical Indo-Pacific. In Chapter 2, I discuss the extent and scope of currently published genetic data for Indo-Pacific marine fauna, highlighting its strengths and omissions.I show that there is a distinct bias towards studies reporting genetic diversity for marine fishes compared to marine invertebrates; that most studies focus on a single species and that there is little coherence across regions in terms of species studied. I find that, generally, regions are not consistently co-sampled with neighbouring regions. For example, the same species is not often sampled from the Great Barrier Reef as well as from Indonesia, immediately to the North. I identify locations from where a disproportionately high number of species have been the focus of genetic studies, which may serve as useful 'anchor' locations for researchers to build a network of sampling locations. In an appropriate collaborative framework this could allow the linking of data across very broad spatial extents to explore commonalities across multiple species.The pattern of decreasing species richness of tropical marine taxa with distance from the Coral Triangle is well known. A concordant pattern has been suggested for genetic diversity, however this con...

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Distribution of Noah’s giant clam, Tridacna noae

Abstract: Previously confused with the small giant clam Tridacna maxima, the recently resurrected Noah's giant clam, Tridacna noae, has been reported from the Taiwanese and the Ryukyu archipelagoes. Our recent underwater observations now extend its distribution to Dongsha (

Cited by 33 publications

References 17 publications

Drivers of density for the exploited giant clam Tridacna maxima: a meta‐analysis

Drivers of density for the exploited giant clam Tridacna maxima: a meta‐analysis

Unifying latitudinal gradients in range size and richness across marine and terrestrial systems

Mapping within-species biodiversity: patterns and predictors of genetic diversity on Indo-Pacific reefs

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