Demography and elasticity of the diamond stingray, Dasyatis dipterura

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Smith, W. D., Cailliet, G. M., & Cort́s, E. (2008). Demography and elasticity of the diamond stingray, Dasyatis dipterura: Parameter uncertainty and resilience to fishing pressure. Marine and Freshwater Research, 59(7), 575-586. doi:10.1071/MF07020
TitleDemography and elasticity of the diamond stingray, Dasyatis dipterura
AuthorsD. Smith, M. Cailliet, E. Cort́s
AbstractDespite their abundance in near-shore tropical and subtropical marine environments, which support much of the world's elasmobranch fisheries, population dynamics and impacts of fisheries on stingrays are poorly documented. Age-structured demographic models were developed using empirical estimates of fecundity, longevity and maturity to project population growth parameters and potential responses to fishing mortality of Dasyatis dipterura from the Bahía Magdalena lagoon complex, México. Monte Carlo simulation was incorporated to include uncertainty in life history parameters into model projections. Six models were developed using deterministic and probabilistic approaches under unexploited and exploited (fishing mortality ≤ 0.05 year-1) conditions. Mean annual population growth rates (γ) of 1.05-1.06 (5-6% increase), net reproductive rates of 2.3-2.4 and generation times of 14.9-16.5 years were projected from simulations. The introduction of a low fishing mortality into probabilistic models produced γ of 1.01 year-1. Elasticity analysis indicated that population growth rates for D. dipterura are more strongly influenced by the survival of juvenile and adult stages than by survival of neonates or changes in fecundity. Demographic analyses indicated that D. dipterura has a low intrinsic growth potential and limited resilience to fishing pressure. Localised depletion or population collapses are therefore likely to occur through unrestricted, unmonitored fishing effort. © CSIRO 2008.
JournalMarine and Freshwater Research
Start page575
End page586
Subjectsabundance, age structure, demography, ecological modeling, fecundity, fish, fishing effort, fishing mortality, growth rate, life history trait, longevity, marine ecosystem, Monte Carlo analysis, neonate, population dynamics, Dasyatidae, Dasyatis dipterura
NoteCited By (since 1996):13