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Memorias de investigación
Communications at congresses:
Application of population dynamics models to meet multiple-use objectives in recreational fisheries management. Case study: brown trout (Salmo trutta) angling in La Rioja (north of Spain)
Research Areas
  • Animal resources
Recreational fisheries management programs usually have to deal with the problem of defining the form and quantifying the intensity of the yield that can be obtained from a stock in order to achieve previously defined objectives of ecological, economic or social nature ? Optimum Sustainable Yield (OSY). This quantification should be given in numeric values with a confidence interval and a significance level, fleeing from speculative quantities. The only way to predict the numerical responses of a population to a given extractive intensity is by knowing the principles that govern its regulation and limitation processes (i.e. population dynamics). We have designed a methodological procedure for this purpose; and it has been applied to a case study - brown trout angling management in a region of the north of Spain (La Rioja)- as follows: (1) definition of the geographical limits and characterization of the dynamics of the populations inhabiting the project area; (2) characterization of the physical and biological habitat; (3) determination of anthropogenic pressures and multiple-use constraints; (4) definition and parameterization of a population dynamics model; (5) definition of objectives to be achieved through the management plan (OSY); (6) simulation of the response of the population to different management measures; and (7) error estimation. Ten local populations of trout? due to the artificial fragmentation of five original populations - forming part of the metapopulation of this species in the middle Ebro river basin have been detected in La Rioja. Eight of them have been found to be able to support angling activities. And the dynamics of the largest four populations could be represented by means of theta-logistic models to which a population viability threshold effect and an adjustable stochastic variation component have been added. In these models the concept of resilience has been defined by two factors: resistance ?which is a function of the difference between population viability threshold and its carrying capacity- and recovery ability ?which is a function of the intrinsic population growth rate. By estimating the resilience of a given population we have been able to determine the Total Allowable Catch (TAC) that meets the requirements of multiple-use river management with a known confidence interval and a previously specified significance level. The logical schema used in this project can be useful to establish conservation and management measures in other recreational fisheries.
6th World Recreational Fishing Conference
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  • Autor: Carlos Alonso Gonzalez (UPM)
  • Autor: Diego M Garcia de Jalon Lastra (UPM)
  • Autor: Javier Gortazar (ECOHIDRAULICA)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Hidrobiología
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