Significance of marine protected areas in central Chile as seeding grounds for the gastropod Concholepas concholepas

Manríquez, Patricio H.; Castilla, Juan Carlos

doi:10.3354/meps215201

Cited by 75 publications

(59 citation statements)

References 31 publications

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“…As well as being short-lived, S. serrata are also highly fecund (2 to 8 million eggs) and are capable of multiple-spawning (Heasman 1980, Heasman et al 1985. Increases in the abundance (density) and size of reproductive individuals within marine reserves has important consequences in maximizing the reproductive capacity of natural populations (Manriquez & Castilla 2001) as well as having the potential to export larvae to surrounding areas, known as 'seeding grounds' (Fernandez & Castilla 1997). Although these 2 concepts are beyond the scope of this paper, we can make predictions based on the biology and patterns displayed by adult S. serrata to marine reserve protection in Moreton Bay.…”

Section: Discussionmentioning

confidence: 99%

Effects of marine reserve protection on the mud crab Scylla serrata in a sex-biased fishery in subtropical Australia

Pillans

Pillans²,

Johnstone³

et al. 2005

Mar. Ecol. Prog. Ser.

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The impact of sex-biased fishing and marine reserve protection on the mud crab Scylla serrata was examined by comparing the catch rates (catch-per-unit-effort, CPUE), mean size, sex ratios and movement of crabs in 2 coastal marine reserves (1.9 and 5.7 km 2 ) and 4 fished non-reserve sites in subtropical Australia. Five years after closure, both marine reserves supported higher catch rates and a larger mean size of S. serrata than non-reserve sites. Males dominated catches of S. serrata in both marine reserves, where CPUE was at least twice as high within the reserves compared to non-reserve sites. Male crabs were also 10% larger in the reserves compared to adjacent fished areas, and of the total male catch, over 70% were equal to or greater than legal size compared to less than 50% outside the reserves. The sex ratio of S. serrata was skewed towards females in all nonreserve sites, which was most likely a result of the ban on taking female S. serrata in Moreton Bay. As only male crabs of ≥15 cm CW made up the S. serrata fishery in Moreton Bay, sex ratios of mature male and female crabs were examined, revealing a strong skew (2:1) towards mature males in both marine reserves. Of the 472 S. serrata captured in this study, 338 were tagged in the reserves in order to document movement of the crabs between the reserve and non-reserve sites. Of the 37 recaptured crabs, 73% were recorded inside the reserves, with some spillover (i.e. cross-boundary movement) of crabs recorded in fished areas. This study demonstrates the effectiveness of small (< 6 km

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Section: Discussionmentioning

confidence: 99%

Effects of marine reserve protection on the mud crab Scylla serrata in a sex-biased fishery in subtropical Australia

Pillans

Pillans²,

Johnstone³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…Whereas debate about larval export often centers on whether export occurs, we know that reserves often lead to dramatic increases in larval production (25)(26)(27) and that larvae disperse on scales far larger than typical reserve sizes (1,28), suggesting that some export of larvae produced in reserves is nearly certain. The more relevant questions include how much export occurs, on what spatial scales, and under what conditions, and whether it provides a benefit to fished areas sufficient to outweigh the increased mortality that may result from displaced effort when closing an area to fishing.…”

mentioning

confidence: 99%

Detecting larval export from marine reserves

Pelc

Warner

Gaines

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

128

133

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Marine reserve theory suggests that where large, productive populations are protected within no-take marine reserves, fished areas outside reserves will benefit through the spillover of larvae produced in the reserves. However, empirical evidence for larval export has been sparse. Here we use a simple idealized coastline model to estimate the expected magnitude and spatial scale of larval export from no-take marine reserves across a range of reserve sizes and larval dispersal scales. Results suggest that, given the magnitude of increased production typically found in marine reserves, benefits from larval export are nearly always large enough to offset increased mortality outside marine reserves due to displaced fishing effort. However, the proportional increase in recruitment at sites outside reserves is typically small, particularly for species with long-distance (on the order of hundreds of kilometers) larval dispersal distances, making it very difficult to detect in field studies. Enhanced recruitment due to export may be detected by sampling several sites at an appropriate range of distances from reserves or at sites downcurrent of reserves in systems with directional dispersal. A review of existing empirical evidence confirms the model's suggestion that detecting export may be difficult without an exceptionally large differential in production, short-distance larval dispersal relative to reserve size, directional dispersal, or a sampling scheme that encompasses a broad range of distances from the reserves.spillover | marine protected areas | recruitment | dispersal | fisheries

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“…Adults live on rocky bottoms in the intertidal and subtidal zones down to ϳ40 m in depth. In central Chile, female C. concholepas lay egg capsules on low intertidal and shallow subtidal rocky surfaces during austral fall months (Manríquez and Castilla 2001). After ϳ1 month of intracapsular development, small planktotrophic veliger larvae (ϳ260 m) are released and spend the next 3 months in the water column (DiSalvo 1988).…”

mentioning

confidence: 99%

Avoiding offshore transport of competent larvae during upwelling events: The case of the gastropod Concholepas concholepas in Central Chile

Poulin

Palma

Leiva

et al. 2002

Limnology & Oceanography

123

113

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The coast of central Chile is characterized by the occurrence of coastal upwelling during the austral spring and summer seasons, which probably has important consequences for the cross‐shelf transport of larval stages of many species. Three cruises were conducted off the locality of El Quisco during upwelling‐favorable wind periods to determine the surface distribution of epineustonic competent larvae of the gastropod Concholepas concholepas during such events. Contrary to the predictions of a traditional model, where neustonic‐type larvae are transported offshore under such conditions, competent larvae of this species were exclusively found in the area between the shore and the upwelling front. Two additional cruises were conducted during calm periods to determine diel variation in the vertical distribution of C. concholepas competent larvae. The absence of competent larvae at the surface during early night hours suggests a reverse vertical migration. Thus, the retention of C. concholepas competent larvae in the upwelled waters could be the result of the interaction between their reverse diel vertical migration and the typical two‐layer upwelling dynamics.

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Significance of marine protected areas in central Chile as seeding grounds for the gastropod Concholepas concholepas

Cited by 75 publications

References 31 publications

Effects of marine reserve protection on the mud crab Scylla serrata in a sex-biased fishery in subtropical Australia

Effects of marine reserve protection on the mud crab Scylla serrata in a sex-biased fishery in subtropical Australia

Detecting larval export from marine reserves

Avoiding offshore transport of competent larvae during upwelling events: The case of the gastropod Concholepas concholepas in Central Chile

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