Limits...
Solomon Islands largest hawksbill turtle rookery shows signs of recovery after 150 years of excessive exploitation.

Hamilton RJ, Bird T, Gereniu C, Pita J, Ramohia PC, Walter R, Goerlich C, Limpus C - PLoS ONE (2015)

Bottom Line: Our results and the results of others, reveal that many of the hawksbill turtles that nest at the ACMCA forage in distant Australian waters, and that nesting on the Arnavons occurs throughout the year with peak nesting activity coinciding with the austral winter.Our results also provide the first known evidence of recovery for a western pacific hawksbill rookery, with the number of nests laid at the ACMCA and the remigration rates of turtles doubling since the establishment of the ACMCA in 1995.The Arnavons case study provides an example of how changes in policy, inclusive community-based management and long term commitment can turn the tide for one of the most charismatic and endangered species on our planet.

View Article: PubMed Central - PubMed

Affiliation: The Nature Conservancy, Asia Pacific Division, 245 Riverside Drive, West End, Brisbane, QLD, 4101, Australia; ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, 4811, Australia.

ABSTRACT
The largest rookery for hawksbill turtles in the oceanic South Pacific is the Arnavon Islands, which are located in the Manning Strait between Isabel and Choiseul Province, Solomon Islands. The history of this rookery is one of overexploitation, conflict and violence. Throughout the 1800s Roviana headhunters from New Georgia repeatedly raided the Manning Strait to collect hawksbill shell which they traded with European whalers. By the 1970s the Arnavons hawksbill population was in severe decline and the national government intervened, declaring the Arnavons a sanctuary in 1976. But this government led initiative was short lived, with traditional owners burning down the government infrastructure and resuming intensive harvesting in 1982. In 1991 routine beach monitoring and turtle tagging commenced at the Arnavons along with extensive community consultations regarding the islands' future, and in 1995 the Arnavon Community Marine Conservation Area (ACMCA) was established. Around the same time national legislation banning the sale of all turtle products was passed. This paper represents the first analysis of data from 4536 beach surveys and 845 individual turtle tagging histories obtained from the Arnavons between 1991-2012. Our results and the results of others, reveal that many of the hawksbill turtles that nest at the ACMCA forage in distant Australian waters, and that nesting on the Arnavons occurs throughout the year with peak nesting activity coinciding with the austral winter. Our results also provide the first known evidence of recovery for a western pacific hawksbill rookery, with the number of nests laid at the ACMCA and the remigration rates of turtles doubling since the establishment of the ACMCA in 1995. The Arnavons case study provides an example of how changes in policy, inclusive community-based management and long term commitment can turn the tide for one of the most charismatic and endangered species on our planet.

No MeSH data available.


Related in: MedlinePlus

Average number of nests sighted per night at Big Maleivona, Kerehikapa, Sikopo and Small Maleivona during the peak nesting period between 1991 and 2012.Grey bars show 95% confidence intervals around the regression line.
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pone.0121435.g004: Average number of nests sighted per night at Big Maleivona, Kerehikapa, Sikopo and Small Maleivona during the peak nesting period between 1991 and 2012.Grey bars show 95% confidence intervals around the regression line.

Mentions: Over the 22 year period there was a significant increasing trend in the number of nests laid per night (Fig. 4, Table 1). Model selection via AIC showed that the model estimating separate rates of increase for each beach provided the best fit (AIC = 87, vs AIC = 91 for the next best model), suggesting a significant increase in number of nests observed over time at some beaches and little change at others. Since the surveys started there has been an overall increase of ~0.42 [0, 0.84] nests per night on Kerehikapa and Big Maleivona, and an increase of ~1.35 [0.75, 2.1], at Sikopo, while Small Maleivona showed no significant increase.


Solomon Islands largest hawksbill turtle rookery shows signs of recovery after 150 years of excessive exploitation.

Hamilton RJ, Bird T, Gereniu C, Pita J, Ramohia PC, Walter R, Goerlich C, Limpus C - PLoS ONE (2015)

Average number of nests sighted per night at Big Maleivona, Kerehikapa, Sikopo and Small Maleivona during the peak nesting period between 1991 and 2012.Grey bars show 95% confidence intervals around the regression line.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390367&req=5

pone.0121435.g004: Average number of nests sighted per night at Big Maleivona, Kerehikapa, Sikopo and Small Maleivona during the peak nesting period between 1991 and 2012.Grey bars show 95% confidence intervals around the regression line.
Mentions: Over the 22 year period there was a significant increasing trend in the number of nests laid per night (Fig. 4, Table 1). Model selection via AIC showed that the model estimating separate rates of increase for each beach provided the best fit (AIC = 87, vs AIC = 91 for the next best model), suggesting a significant increase in number of nests observed over time at some beaches and little change at others. Since the surveys started there has been an overall increase of ~0.42 [0, 0.84] nests per night on Kerehikapa and Big Maleivona, and an increase of ~1.35 [0.75, 2.1], at Sikopo, while Small Maleivona showed no significant increase.

Bottom Line: Our results and the results of others, reveal that many of the hawksbill turtles that nest at the ACMCA forage in distant Australian waters, and that nesting on the Arnavons occurs throughout the year with peak nesting activity coinciding with the austral winter.Our results also provide the first known evidence of recovery for a western pacific hawksbill rookery, with the number of nests laid at the ACMCA and the remigration rates of turtles doubling since the establishment of the ACMCA in 1995.The Arnavons case study provides an example of how changes in policy, inclusive community-based management and long term commitment can turn the tide for one of the most charismatic and endangered species on our planet.

View Article: PubMed Central - PubMed

Affiliation: The Nature Conservancy, Asia Pacific Division, 245 Riverside Drive, West End, Brisbane, QLD, 4101, Australia; ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, 4811, Australia.

ABSTRACT
The largest rookery for hawksbill turtles in the oceanic South Pacific is the Arnavon Islands, which are located in the Manning Strait between Isabel and Choiseul Province, Solomon Islands. The history of this rookery is one of overexploitation, conflict and violence. Throughout the 1800s Roviana headhunters from New Georgia repeatedly raided the Manning Strait to collect hawksbill shell which they traded with European whalers. By the 1970s the Arnavons hawksbill population was in severe decline and the national government intervened, declaring the Arnavons a sanctuary in 1976. But this government led initiative was short lived, with traditional owners burning down the government infrastructure and resuming intensive harvesting in 1982. In 1991 routine beach monitoring and turtle tagging commenced at the Arnavons along with extensive community consultations regarding the islands' future, and in 1995 the Arnavon Community Marine Conservation Area (ACMCA) was established. Around the same time national legislation banning the sale of all turtle products was passed. This paper represents the first analysis of data from 4536 beach surveys and 845 individual turtle tagging histories obtained from the Arnavons between 1991-2012. Our results and the results of others, reveal that many of the hawksbill turtles that nest at the ACMCA forage in distant Australian waters, and that nesting on the Arnavons occurs throughout the year with peak nesting activity coinciding with the austral winter. Our results also provide the first known evidence of recovery for a western pacific hawksbill rookery, with the number of nests laid at the ACMCA and the remigration rates of turtles doubling since the establishment of the ACMCA in 1995. The Arnavons case study provides an example of how changes in policy, inclusive community-based management and long term commitment can turn the tide for one of the most charismatic and endangered species on our planet.

No MeSH data available.


Related in: MedlinePlus