TY - JOUR
T1 - Demographical analysis of the pink ling Genypterus blacodes (Schneider 1801) in the austral demersal fishery
T2 - A matrix approach evaluating harvest and non-harvest states
AU - González-Olivares, Eduardo
AU - Aránguiz-Acuña, Adriana
AU - Ramos-Jiliberto, Rodrigo
AU - Rojas-Palma, Alejandro
PY - 2009/3
Y1 - 2009/3
N2 - In this work we model the population dynamics of Genypterus blacodes of the demersal fishery on Chilean southern-austral region, using stage structured matrices, from a 17-year time-series of annual age-specific female abundances. For the parameterized matrices obtained, we calculated population growth rates with confidence intervals, net reproductive rate, reproductive value, stable stage structure, and we performed a sensitivity analysis. We also generated and analyzed an analogous stage structured matrix model for the same population assuming no harvesting. The main results are (1) a negative growth rate for the observed population data; (2) a positive growth rate for the population without the capture effect which is significantly different from the growth rate of the harvested population; (3) the sensitivity analysis revealed that λ is more sensitive to variations in adult survival in the age class 7-10 years; (4) the observed population exhibits a stable stage structure.
AB - In this work we model the population dynamics of Genypterus blacodes of the demersal fishery on Chilean southern-austral region, using stage structured matrices, from a 17-year time-series of annual age-specific female abundances. For the parameterized matrices obtained, we calculated population growth rates with confidence intervals, net reproductive rate, reproductive value, stable stage structure, and we performed a sensitivity analysis. We also generated and analyzed an analogous stage structured matrix model for the same population assuming no harvesting. The main results are (1) a negative growth rate for the observed population data; (2) a positive growth rate for the population without the capture effect which is significantly different from the growth rate of the harvested population; (3) the sensitivity analysis revealed that λ is more sensitive to variations in adult survival in the age class 7-10 years; (4) the observed population exhibits a stable stage structure.
KW - Genypterus blacodes
KW - Ling
KW - Matrix models
KW - Perturbation analysis
KW - Population elasticity
KW - Population growth rate
UR - https://www.scopus.com/pages/publications/59449104321
U2 - 10.1016/j.fishres.2008.11.006
DO - 10.1016/j.fishres.2008.11.006
M3 - Article
AN - SCOPUS:59449104321
SN - 0165-7836
VL - 96
SP - 216
EP - 222
JO - Fisheries Research
JF - Fisheries Research
IS - 2-3
ER -