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Linking inbreeding effects in captive populations with fitness in the wild: Release of replicated Drosophila melanogaster lines under different temperatures

Conservation Biology, 2008 Feb, Vol.22(1), pp.189-199 [Peer Reviewed Journal]

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  • Title:
    Linking inbreeding effects in captive populations with fitness in the wild: Release of replicated Drosophila melanogaster lines under different temperatures
  • Author: Kristensen, Tn ; Loeschcke, V ; Hoffmann, AA
  • Found In: Conservation Biology, 2008 Feb, Vol.22(1), pp.189-199 [Peer Reviewed Journal]
  • Subjects: Drosophila
  • Language: English
  • Description: To purchase or authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1523-1739.2007.00816.x Byline: TORSTEN N. KRISTENSEN (*[dagger][double dagger]), VOLKER LOESCHCKE ([dagger]), ARY A. HOFFMANN (*) Keywords: Drosophila melanogaster; genotype and environment interactions; field fitness; inbreeding depression; thermal stress Abstract: Abstract: Inbreeding effects have been detected in captive populations of threatened species, but the extent to which these effects translate into fitness under field conditions is mostly unknown. We address this issue by comparing the performance of replicated noninbred and inbred Drosophila lines under field and laboratory conditions. We asked whether environment-dependent effects of inbreeding can be demonstrated for a field-fitness component in Drosophila, the ability of flies to locate resources, and associated the results with results on effects of inbreeding investigated in the laboratory. Inbreeding effects were evident when releases were undertaken under warm conditions, but not under cold conditions, which illustrates the environment-dependent nature of inbreeding depression. Inbreeding effects were much stronger in the field at warm temperatures than in laboratory stress tests, particularly for females. Effects of inbreeding based on performance in traditional inbreeding assays (viability, productivity) or from laboratory stress tests poorly predicted performance in the field. Inbreeding effects on resource location in the field can be strongly deleterious under some thermal conditions and involve traits not easily measured under laboratory conditions. More generally, inbreeding effects measured in captive populations may not necessarily predict their field performance, and programs to purge captive populations of deleterious alleles may not necessarily lead to fitness benefits in the wild. Abstract (Spanish): Ligando los Efectos de la Endogamia en Poblaciones Cautivas con la Adecuacion Biologica en el Medio Natural: Liberacion de Lineas de Drosophila melanogaster Replicadas Bajo Temperaturas Diferentes Resumen: Los efectos de la endogamia han sido detectados en poblaciones cautivas de especies amenazadas, pero el grado en que estos efectos se traducen en adecuacion biologica en el campo es practicamente desconocido. Abordamos este tema mediante la comparacion del funcionamiento de lineas replicadas, endogamicas y no endogamicas, de Drosophila bajo condiciones de campo y de laboratorio. Preguntamos si los efectos de la endogamia dependientes del ambiente pueden ser demostrados como un componente de la adecuacion biologica de Drosophila en el campo la habilidad de las moscas para localizar recursos-y asociamos los resultados con los resultados de los efectos de la endogamia investigados en el laboratorio. Los efectos de la endogamia fueron evidentes cuando las liberaciones se llevaron a cabo en condiciones calidas, pero no en condiciones frias, lo cual ilustra que la depresion por endogamia depende del ambiente. Los efectos de la endogamia fueron mucho mas fuertes a temperaturas calidas en el campo que en las pruebas de estres en el laboratorio, particularmente para las hembras. Los efectos de la endogamia basados en el funcionamiento en analisis tradicionales de endogamia (viabilidad, productividad) o en pruebas de estres en el laboratorio fueron malos predictores del funcionamiento en el campo. Los efectos de la endogamia sobre la localizacion de recursos en el campo pueden ser fuertemente deletereos bajo condiciones termicas e involucran caracteristicas no facilmente medidas en condiciones de laboratorio. Mas generalmente, es posible que los efectos de la endogamia medidos en poblaciones cautivas no pronostiquen necesariamente su funcionamiento en el campo, y los programas para purgar los alelos deletereos en las poblaciones cautivas no conduciran necesariamente a beneficios para la adecuacion biologica en el medio silvestre. Author Affiliation: (*)Center for Environmental Stress and Adaptation Research, Departments of Genetics and Zoology, The University of Melbourne, Melbourne, VIC 3010, Australia ([dagger])Aarhus Centre for Environmental Stress Research, Department of Biological Sciences, University of Aarhus, Ny Munkegade, Building 1540, DK-8000 Aarhus C, Denmark Article History: Paper submitted February 22, 2007; revised manuscript accepted July 2, 2007. Article note: ([double dagger]) Address correspondence to University of Aarhus, Institute of Genetics and Biotechnology, P.O. Box 50, DK-8830 Tjele, Denmark, email torsten.nygaard@agrsci.dk
  • Identifier: ISSN: 0888-8892 ; DOI: 10.1111/j.1523-1739.2007.00816.x

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