Limits...
Estimating Sustainable Live-Coral Harvest at Kamiali Wildlife Management Area, Papua New Guinea.

Longenecker K, Bolick H, Langston R - PLoS ONE (2015)

Bottom Line: Artisanal lime-makers convert 24.8% of whole-colony weight into marketable lime, thus we estimate 7615.2 g of lime can be sustainably produced annually from corymbose Acropora.This value incorporates several safety margins, and should lead to proper management of live coral harvest.Importantly, the guideline recognizes village rights to exploit its marine resources, is consistent with village needs for income, and balances an equally strong village desire to conserve its marine resources for future generations.

View Article: PubMed Central - PubMed

Affiliation: Department of Natural Sciences, Bishop Museum, Honolulu, Hawai'i, United States of America.

ABSTRACT
Live coral is harvested throughout the Indo-West Pacific to make lime, used in the consumption of the world's fourth-most consumed drug, betel nut. Coral harvesting is an environmental concern; however, because lime-making is one of the few sources of income in some areas of Papua New Guinea (PNG), the practice is unlikely to stop. To better manage coral harvest, we used standard fishery-yield methods to generate sustainable-harvest guidelines for corymbose Acropora species found on the reef flat and crest at Lababia, PNG. We constructed a yield curve (weight-specific net annual-dry-weight production) by: 1) describing the allometric relationship between colony size and dry weight, and using that relationship to estimate the dry weight of Acropora colonies in situ; 2) estimating annual growth of Acropora colonies by estimating in situ, and describing the relationship between, colony dry weight at the beginning and end of one year; and 3) conducting belt-transect surveys to describe weight-frequencies and ultimately to predict annual weight change per square meter for each weight class. Reef habitat covers a total 2,467,550 m2 at Lababia and produces an estimated 248,397 kg/y (dry weight) of corymbose Acropora, of which 203,897 kg is produced on the reef flat/crest. We conservatively estimate that 30,706.6 kg of whole, dry, corymbose, Acropora can be sustainably harvested from the reef flat/crest habitat each year provided each culled colony weighs at least 1805 g when dry (or is at least 46 cm along its major axis). Artisanal lime-makers convert 24.8% of whole-colony weight into marketable lime, thus we estimate 7615.2 g of lime can be sustainably produced annually from corymbose Acropora. This value incorporates several safety margins, and should lead to proper management of live coral harvest. Importantly, the guideline recognizes village rights to exploit its marine resources, is consistent with village needs for income, and balances an equally strong village desire to conserve its marine resources for future generations.

No MeSH data available.


Related in: MedlinePlus

Net annual dry-weight production, by weight class, of corymbose Acropora on reef flats and crests at KWMA.Assuming weight and age are positively related, each bar represents a year-class. Putative age is indicated by the number above or in a given bar. Excluded from the plot is the influence of two colonies estimated to be 8059 and 18,877 g. Note that dry weight is plotted on a logarithmic scale.
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pone.0140026.g007: Net annual dry-weight production, by weight class, of corymbose Acropora on reef flats and crests at KWMA.Assuming weight and age are positively related, each bar represents a year-class. Putative age is indicated by the number above or in a given bar. Excluded from the plot is the influence of two colonies estimated to be 8059 and 18,877 g. Note that dry weight is plotted on a logarithmic scale.

Mentions: We used the allometric relationship to estimate that the upper weight limit of colonies putatively less than one-year-old is 44.1 g. Our annual-growth-predictor equation for the reef flat/crest was not suitable for constructing putative 1-yr weight classes because it predicted that colonies < 51.1 g experience 100% mortality and that colonies < 127.3 g lose weight (i.e., the equation predicted negative growth for the smallest weight classes). We instead used a linear regression forced through the origin [Wt+1 = 1.64(Wt); r2 = 0.548] to determine the limits of putative 1-yr weight classes (Fig 2, dashed green portion). The annual growth rate predicted by the revised regression was lower than that for the original annual-growth-predictor (64.4% versus 67.5% per year, respectively). The resulting yield curve is presented in Fig 7. Considering the parameters of our conservative harvest rules, no colony weighing less than 1805 g should be collected. We estimate that colonies in the 1805–2765 g weight class will produce 16.66 g/m2/yr and that, with a total 1,843,555 m2 of reef flat/crest at KWMA, the net dry-weight production of this weight class of corymbose Acropora colonies is 30,706.6 kg/y.


Estimating Sustainable Live-Coral Harvest at Kamiali Wildlife Management Area, Papua New Guinea.

Longenecker K, Bolick H, Langston R - PLoS ONE (2015)

Net annual dry-weight production, by weight class, of corymbose Acropora on reef flats and crests at KWMA.Assuming weight and age are positively related, each bar represents a year-class. Putative age is indicated by the number above or in a given bar. Excluded from the plot is the influence of two colonies estimated to be 8059 and 18,877 g. Note that dry weight is plotted on a logarithmic scale.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4593639&req=5

pone.0140026.g007: Net annual dry-weight production, by weight class, of corymbose Acropora on reef flats and crests at KWMA.Assuming weight and age are positively related, each bar represents a year-class. Putative age is indicated by the number above or in a given bar. Excluded from the plot is the influence of two colonies estimated to be 8059 and 18,877 g. Note that dry weight is plotted on a logarithmic scale.
Mentions: We used the allometric relationship to estimate that the upper weight limit of colonies putatively less than one-year-old is 44.1 g. Our annual-growth-predictor equation for the reef flat/crest was not suitable for constructing putative 1-yr weight classes because it predicted that colonies < 51.1 g experience 100% mortality and that colonies < 127.3 g lose weight (i.e., the equation predicted negative growth for the smallest weight classes). We instead used a linear regression forced through the origin [Wt+1 = 1.64(Wt); r2 = 0.548] to determine the limits of putative 1-yr weight classes (Fig 2, dashed green portion). The annual growth rate predicted by the revised regression was lower than that for the original annual-growth-predictor (64.4% versus 67.5% per year, respectively). The resulting yield curve is presented in Fig 7. Considering the parameters of our conservative harvest rules, no colony weighing less than 1805 g should be collected. We estimate that colonies in the 1805–2765 g weight class will produce 16.66 g/m2/yr and that, with a total 1,843,555 m2 of reef flat/crest at KWMA, the net dry-weight production of this weight class of corymbose Acropora colonies is 30,706.6 kg/y.

Bottom Line: Artisanal lime-makers convert 24.8% of whole-colony weight into marketable lime, thus we estimate 7615.2 g of lime can be sustainably produced annually from corymbose Acropora.This value incorporates several safety margins, and should lead to proper management of live coral harvest.Importantly, the guideline recognizes village rights to exploit its marine resources, is consistent with village needs for income, and balances an equally strong village desire to conserve its marine resources for future generations.

View Article: PubMed Central - PubMed

Affiliation: Department of Natural Sciences, Bishop Museum, Honolulu, Hawai'i, United States of America.

ABSTRACT
Live coral is harvested throughout the Indo-West Pacific to make lime, used in the consumption of the world's fourth-most consumed drug, betel nut. Coral harvesting is an environmental concern; however, because lime-making is one of the few sources of income in some areas of Papua New Guinea (PNG), the practice is unlikely to stop. To better manage coral harvest, we used standard fishery-yield methods to generate sustainable-harvest guidelines for corymbose Acropora species found on the reef flat and crest at Lababia, PNG. We constructed a yield curve (weight-specific net annual-dry-weight production) by: 1) describing the allometric relationship between colony size and dry weight, and using that relationship to estimate the dry weight of Acropora colonies in situ; 2) estimating annual growth of Acropora colonies by estimating in situ, and describing the relationship between, colony dry weight at the beginning and end of one year; and 3) conducting belt-transect surveys to describe weight-frequencies and ultimately to predict annual weight change per square meter for each weight class. Reef habitat covers a total 2,467,550 m2 at Lababia and produces an estimated 248,397 kg/y (dry weight) of corymbose Acropora, of which 203,897 kg is produced on the reef flat/crest. We conservatively estimate that 30,706.6 kg of whole, dry, corymbose, Acropora can be sustainably harvested from the reef flat/crest habitat each year provided each culled colony weighs at least 1805 g when dry (or is at least 46 cm along its major axis). Artisanal lime-makers convert 24.8% of whole-colony weight into marketable lime, thus we estimate 7615.2 g of lime can be sustainably produced annually from corymbose Acropora. This value incorporates several safety margins, and should lead to proper management of live coral harvest. Importantly, the guideline recognizes village rights to exploit its marine resources, is consistent with village needs for income, and balances an equally strong village desire to conserve its marine resources for future generations.

No MeSH data available.


Related in: MedlinePlus