Impact of tourism-related fishing on Tridacna maxima (Mollusca, Bivalvia) stocks in Bora-Bora Lagoon (French Polynesia)

Planes, Serge; Chauvet, C.; Baldwin, J.; Bonvallot, Jacques; Fontaine-vernaudon, Y.; Gabrié, C.; Holthus, Paul; Payri, Claude; Galzin, René

doi:10.5479/si.00775630.385.1

Cited by 11 publications

(9 citation statements)

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“…Jumlah jenis kima berdasarkan atas hasil penelitian di berbagai lokasi di Indonesia (Planes et al, 1993). Jika dibandingkan dengan penelitian di daerah lain, angka tersebut terbilang tinggi.…”

Section: -148unclassified

Kepadatan Dan Kondisi Habitat Kerang Kima (Cardiidae: Tridacninae) Di Beberapa Lokasi Di Perairan Sulawesi Utara

Arbi

2017

BAWAL Widya Riset Perikanan Tangkap

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Section: -148unclassified

Kepadatan Dan Kondisi Habitat Kerang Kima (Cardiidae: Tridacninae) Di Beberapa Lokasi Di Perairan Sulawesi Utara

Arbi

2017

BAWAL Widya Riset Perikanan Tangkap

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“…) and some of the Society Islands in French Polynesia (Planes et al . ). Similar levels of exploitation were reported in the early 2000s from small and isolated islands of French Polynesia (Gilbert et al .…”

Section: Introductionmentioning

confidence: 97%

“…Planes et al . ; Wagner ) or reduced survival rates (Apte and Dutta ) in fished areas. At global scale, Othman et al .…”

Section: Introductionmentioning

confidence: 99%

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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“…Population size assessments of giant clams have so far followed various techniques such as the transect based method to estimate relative abundance following abundance class codes (Planes, 1992), remote sensing of stocks (Green & Craig 1999;Green et al, 2000;Andréfouët et al, 2005), or more recently, a combination of remote sensing and in situ data collection (Gilbert et al, , 2006. The latter study in French Polynesia has suggested that high resolution images coupled with adaptive sampling through quadrats under high clam densities, and belt transects of increasing dimensions under moderate to low densities, can provide reasonably good clam stock assessments and habitat characterization of coral reefs.…”

Section: R E S U L T S a N D Discussionmentioning

confidence: 99%

“…; see Andrefouet et al, 2005) followed by predation and poaching (Calumpong et al, 2000). Years of overexploitation for local consumption and supply to commercial markets, have caused several giant clam populations to decline worldwide (Bartlett, 1975;Pearson, 1977;Planes et al, 1992;Kinch, 2002;Raymakers et al, 2003). Such ecological insight has highlighted the necessity of regular stock assessments of giant clams in reefs that are subjected to fishing, along with providing these organisms legal protection under international (IUCN (Wells et al, 1983), CITES Appendix II (Wells, 1983)) and national jurisdictions.…”

Section: Introductionmentioning

confidence: 97%

Monitoring densities of the giant clam Tridacna maxima in the Lakshadweep Archipelago

Apte

Dutta

Babu

2010

Mar. Biodivers. Rec.

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Giant clams are endangered in many parts of their Indo-Pacific range owing to adult specific overharvesting that threatens recruitment, a demographic parameter exhibiting high sensitivity to environmental disturbances and adult densities among tridacnids. Lakshadweep reefs are not subjected to commercial giant clam fishery, and population assessment has not been carried out in these waters so far. We monitored the small giant clam Tridacna maxima populations in confined waters of 12 reefs in Lakshadweep Archipelago during 2005 -2007 using a systematic line transect based distance sampling framework. Overall T. maxima density in the Archipelago was estimated at 141.2/ha (95% CL 118.2 -168.7) in 2005 and 122.7/ha (103.60 -145.37) in 2006. Populations showed wide variation in densities and relative proportions of different age-classes between reefs. While Agatti, Bitra and Chetlat lagoons harboured high clam densities, Amini harboured the most impoverished population. Data simulation showed that total clam count along transects of 100 m length × 2-5 m strip width, in a minimum of 140 replicates, stratified by area among lagoons, would provide a viable monitoring index for rapid assessments of T. maxima in Lakshadweep. Compared to unbiased absolute abundance estimates, this monitoring index could be achieved more easily, without much compromise on accuracy and precision, necessary for meaningful spatio-temporal comparisons.

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Impact of tourism-related fishing on Tridacna maxima (Mollusca, Bivalvia) stocks in Bora-Bora Lagoon (French Polynesia)

Cited by 11 publications

References 0 publications

Kepadatan Dan Kondisi Habitat Kerang Kima (Cardiidae: Tridacninae) Di Beberapa Lokasi Di Perairan Sulawesi Utara

Kepadatan Dan Kondisi Habitat Kerang Kima (Cardiidae: Tridacninae) Di Beberapa Lokasi Di Perairan Sulawesi Utara

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

Monitoring densities of the giant clam Tridacna maxima in the Lakshadweep Archipelago

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