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      ASIMETRIA FLUCTUANTE EN DOS POBLACIONES DE CEROGLOSSUS CHILENSIS (ESCBSCROLTZ, 1829) (COLEÓPTERA: CARABIDAE) EN EL AGROECOSISTEMA PINUSRADÍALA D. DON REGION DEL BIO-BIO, CHILE Translated title: FLUCTUATING ASYMMETRY IN TWO POPULATIONS OF CEROGLOSSUS CHILENSIS (ESCHSCHOLTZ, 1829) (COLEOPTERA: CARABIDAE) IN AGROECOSYSTEM OF PINUS RADIATA D. DON AGROECOSYSTM, BIO-BIO REGION, CHILE

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          Abstract

          Para Ceroglossus chilensis se realizo un análisis de Asimetría Fluctuante (AF) en poblaciones presentes en plantaciones de Pinus radiata de diferentes edades y tipos de manejo, ubicadas en la cordillera de la costa y precordillera andina de la Región del Bío-Bío, Chile. El objetivo fue comparar en diferentes poblaciones de C. chilensis niveles de AF, a través de medidas del tercer segmento antenal. Para ello los insectos se recolectaron mediante trampas de intercepción entre diciembre 2004 y enero 2005, en plantaciones de 6-7, 10, 13 y 22-24 años. Nuestros resultados mostraron para el total de individuos (n = 128), diferencias significativas en los valores de AF en plantaciones de 6-7 (post primer raleo) y 10 años (previo raleo comercial) para ambas situaciones geográficas. Al analizar los sexos por separado, se encontró machos y hembras asimétricas en plantaciones de 13 años de la precordillera andina y Cordillera de la Costa, respectivamente. No se encontró correlación entre las abundancias, porcentaje de cobertura del sotobosque y asimetría fluctuante para ambas situaciones geográficas. Se discute si la asimetría en antenas puede afectar negativamente la adecuación biológica de los individuos expresada en menor éxito en la captura de presas y encuentro de pareja, reflejo probable del efecto que el tipo de manejo al que ha sido sometida la plantación tendría sobre la ontogenia de los individuos.

          Translated abstract

          An analysis of fluctuating asymmetry (FA) was conducted on populations oí Ceroglossus chilensis. The aim of this study was to compare levels of FA at the third antennal segment, among populations from pine plantations of different ages and handling type located in the Coastal mountain range and the Andes foothill of Chile. Insects were collected with pitfall traps during December, 2004, and January, 2005, in plantations of 6-7, 10, 13, and 22-24 years old. Our results show for the total of insects (n= 128), significant differences in FA values in 6-7 (first tree thinning) and 10 years old plantations (commercial thinning) located in both geographical locations. No correlations were found between FA, abundance and the presence of plantation understory. Asymmetry may be the consequence of different plantation management. We discuss how antennal asymmetry may affect in relation to prey capture and mate search.

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          Most cited references38

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          Fluctuating Asymmetry: Measurement, Analysis, Patterns

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            Fluctuating asymmetry: an epigenetic measure of stress.

            (1) Fluctuating asymmetry (FA) is a useful trait for monitoring stress in the laboratory and in natural environments. (2) Both genomic and environmental changes can increase FA which represents a deterioration in developmental homeostasis apparent in adult morphology. Genetic perturbations include intense directional selection and certain specific genes. Environmental perturbations include temperature extremes in particular, protein deprivation, audiogenic stress, and exposure to pollutants. (3) There is a negative association between FA and heterozygosity in a range of taxa especially fish, a result consistent with FA being a measure of fitness. (4) Scattered reports on non-experimental populations are consistent with experiments under controlled laboratory conditions. FA tends to increase as habitats become ecologically marginal; this includes exposure to environmental toxicants. (5) In our own species, FA of an increasing range of traits has been related to both environmental and genomic stress. (6) Domestication increases FA of the strength of homologous long bones of vertebrate species due to a relaxation of natural selection. (7) FA levels are paralleled by the incidence of skeletal abnormalities in stressful environments. (8) Increased FA is a reflection of poorer developmental homeostasis at the molecular, chromosomal and epigenetic levels.
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              A STUDY OF FLUCTUATING ASYMMETRY

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                Author and article information

                Journal
                gayana
                Gayana (Concepción)
                Gayana (Concepc.)
                Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción (Concepción, , Chile )
                0717-652X
                0717-6538
                2008
                : 72
                : 2
                : 131-139
                Affiliations
                [01] Concepción orgnameUniversidad de Concepción orgdiv1Facultad de Ciencias Naturales y Oceanógraficas orgdiv2Departamento de Zoología Chile hugobenitez@ 123456udec.cl
                [02] Alicante orgnameUniversidad de Alicante orgdiv1Centro Iberoamericano de la Biodiversidad (CIBIO) orgdiv2Programa de Doctorado en Biodiversidad España
                Article
                S0717-65382008000200003 S0717-6538(08)07200203
                10.4067/S0717-65382008000200003
                bfeb5ea4-eb46-46a6-b407-6a78788e0280

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 22 May 2007
                : 02 September 2008
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 9
                Product

                SciELO Chile

                Categories
                Ambiente Terrestre

                adecuación biológica,Pinus radiata,agroecosystem,asymmetry,biological adaptation,agroecosistema,asimetría

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