Assessment of spatiotemporal variability of giant clam populations (Cardiidae: <i>Tridacna</i> ) from 11 years of monitoring at Koh Tao, Thailand. Mehrotra, R., Allchurch, A., Monchanin, C., & Scott, C. M Journal of Molluscan Studies, 87(4):eyab042, December, 2021. ![Assessment of spatiotemporal variability of giant clam populations (Cardiidae: <i>Tridacna</i> ) from 11 years of monitoring at Koh Tao, Thailand [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex ABSTRACT Giant clams (Tridacninae) are an ecologically important species in coral reef habitats across the Indo-Pacific. Numerous examples of giant clam population declines of varying degrees of severity have been documented since the 1970s. These have been attributed to several reasons, such as overexploitation in regional fisheries and ornamental trades, extreme weather events and anomalous marine warming events leading to bleaching. In Thailand, this has led to extensive conservation efforts, such as legal protections and population restocking. Despite these strong measures, to date no long-term studies have been conducted on giant clam populations in Thai waters. We provide results from 11 years (2009–2019) of giant clam population monitoring, at Koh Tao, an island with a well-documented history of coral reef-associated stressors as well as conservation efforts. Surveys were conducted across two depth ranges at 18 reef sites around the island, revealing contrasting trends. Our findings indicate a significant population decline of Tridacna crocea from coral reefs in the 6–8 m depth range, from 1.41 (±0.47) individuals/100 m2 in 2010 to 0.59 (±0.17) individuals/100 m2 in 2019, with, however, no significant change in T. squamosa populations at this depth range. Data from the 3–5 m depth range indicate no significant change in the T. crocea population over the years, but a population increase of T. squamosa from 0.78 (±0.18) individuals/100 m2 in 2009 to 2.07 (±0.38) individuals/100 m2 in 2019. Abundance estimates from these sites indicate extensive heterogeneity in giant clam populations around the island, and highlight the importance of sufficient spatial resolution in identifying population trends.
@article{mehrotra_assessment_2021,
title = {Assessment of spatiotemporal variability of giant clam populations ({Cardiidae}: \textit{{Tridacna}} ) from 11 years of monitoring at {Koh} {Tao}, {Thailand}},
volume = {87},
issn = {0260-1230, 1464-3766},
shorttitle = {Assessment of spatiotemporal variability of giant clam populations ({Cardiidae}},
url = {https://academic.oup.com/mollus/article/doi/10.1093/mollus/eyab042/6470381},
doi = {10.1093/mollus/eyab042},
abstract = {ABSTRACT
Giant clams (Tridacninae) are an ecologically important species in coral reef habitats across the Indo-Pacific. Numerous examples of giant clam population declines of varying degrees of severity have been documented since the 1970s. These have been attributed to several reasons, such as overexploitation in regional fisheries and ornamental trades, extreme weather events and anomalous marine warming events leading to bleaching. In Thailand, this has led to extensive conservation efforts, such as legal protections and population restocking. Despite these strong measures, to date no long-term studies have been conducted on giant clam populations in Thai waters. We provide results from 11 years (2009–2019) of giant clam population monitoring, at Koh Tao, an island with a well-documented history of coral reef-associated stressors as well as conservation efforts. Surveys were conducted across two depth ranges at 18 reef sites around the island, revealing contrasting trends. Our findings indicate a significant population decline of Tridacna crocea from coral reefs in the 6–8 m depth range, from 1.41 (±0.47) individuals/100 m2 in 2010 to 0.59 (±0.17) individuals/100 m2 in 2019, with, however, no significant change in T. squamosa populations at this depth range. Data from the 3–5 m depth range indicate no significant change in the T. crocea population over the years, but a population increase of T. squamosa from 0.78 (±0.18) individuals/100 m2 in 2009 to 2.07 (±0.38) individuals/100 m2 in 2019. Abundance estimates from these sites indicate extensive heterogeneity in giant clam populations around the island, and highlight the importance of sufficient spatial resolution in identifying population trends.},
language = {en},
number = {4},
urldate = {2022-08-01},
journal = {Journal of Molluscan Studies},
author = {Mehrotra, Rahul and Allchurch, Alyssa and Monchanin, Coline and Scott, Chad M},
month = dec,
year = {2021},
pages = {eyab042},
}
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These have been attributed to several reasons, such as overexploitation in regional fisheries and ornamental trades, extreme weather events and anomalous marine warming events leading to bleaching. In Thailand, this has led to extensive conservation efforts, such as legal protections and population restocking. Despite these strong measures, to date no long-term studies have been conducted on giant clam populations in Thai waters. We provide results from 11 years (2009–2019) of giant clam population monitoring, at Koh Tao, an island with a well-documented history of coral reef-associated stressors as well as conservation efforts. Surveys were conducted across two depth ranges at 18 reef sites around the island, revealing contrasting trends. Our findings indicate a significant population decline of Tridacna crocea from coral reefs in the 6–8 m depth range, from 1.41 (±0.47) individuals/100 m2 in 2010 to 0.59 (±0.17) individuals/100 m2 in 2019, with, however, no significant change in T. squamosa populations at this depth range. Data from the 3–5 m depth range indicate no significant change in the T. crocea population over the years, but a population increase of T. squamosa from 0.78 (±0.18) individuals/100 m2 in 2009 to 2.07 (±0.38) individuals/100 m2 in 2019. 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