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

Relative frequency plot of estimated weights of corymbose Acropora colonies at KWMA.70 fore reef specimens, 212 reef flat/crest specimens. Colonies with likely overestimated weights are not shown (8059 and 18,877 g colonies from the reef flat/crest, and a 26,396 g colony from the fore reef).
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pone.0140026.g006: Relative frequency plot of estimated weights of corymbose Acropora colonies at KWMA.70 fore reef specimens, 212 reef flat/crest specimens. Colonies with likely overestimated weights are not shown (8059 and 18,877 g colonies from the reef flat/crest, and a 26,396 g colony from the fore reef).

Mentions: We surveyed a total of seventy 10-m2 transects (Fig 2, green parallelogram). Fifty-three transects were in the reef flat/crest habitat, whereas 17 were in the fore reef habitat. Fig 6 shows the distribution of estimated colony weights (Wt) in each habitat. Colony density was not significantly different between the two habitats (0.400 ± 0.365/m2 on the reef flat/crest and 0.412 ± 0.473/m2 on the fore reef, t = 0.107, df = 68, P = 0.915). Mean estimated dry weight per m2 was nearly twice as high on the fore reef (390.5 ± 646.1 g) than on the reef flat/crest (211.1 ± 366.7 g). However, the values were not significantly different (t = 1.090, df = 19, P = 0.145). Because of faster growth on the reef flat/crest (Fig 5), estimated mean annual dry weight increase per m2 (Fig 2, solid green portion) was higher there (110.6 ± 228.6 g/m2) than on the fore reef (70.3 ± 84.1 g/m2). However, the difference was not statistically significant (t = -1.074, df = 67, P = 0.143).


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

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

Relative frequency plot of estimated weights of corymbose Acropora colonies at KWMA.70 fore reef specimens, 212 reef flat/crest specimens. Colonies with likely overestimated weights are not shown (8059 and 18,877 g colonies from the reef flat/crest, and a 26,396 g colony from the fore reef).
© Copyright Policy
Related In: Results  -  Collection

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

pone.0140026.g006: Relative frequency plot of estimated weights of corymbose Acropora colonies at KWMA.70 fore reef specimens, 212 reef flat/crest specimens. Colonies with likely overestimated weights are not shown (8059 and 18,877 g colonies from the reef flat/crest, and a 26,396 g colony from the fore reef).
Mentions: We surveyed a total of seventy 10-m2 transects (Fig 2, green parallelogram). Fifty-three transects were in the reef flat/crest habitat, whereas 17 were in the fore reef habitat. Fig 6 shows the distribution of estimated colony weights (Wt) in each habitat. Colony density was not significantly different between the two habitats (0.400 ± 0.365/m2 on the reef flat/crest and 0.412 ± 0.473/m2 on the fore reef, t = 0.107, df = 68, P = 0.915). Mean estimated dry weight per m2 was nearly twice as high on the fore reef (390.5 ± 646.1 g) than on the reef flat/crest (211.1 ± 366.7 g). However, the values were not significantly different (t = 1.090, df = 19, P = 0.145). Because of faster growth on the reef flat/crest (Fig 5), estimated mean annual dry weight increase per m2 (Fig 2, solid green portion) was higher there (110.6 ± 228.6 g/m2) than on the fore reef (70.3 ± 84.1 g/m2). However, the difference was not statistically significant (t = -1.074, df = 67, P = 0.143).

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