Demographic response to the manipulation of adult females in corn mouse populations
Variation in population abundance is a consequence of changes in demographic parameters such as survival and recruitment. These demographic parameters can be affected by intraspecific competition, thus adults may play an important role influencing the survival and/or reproduction of juvenile individuals in many species of small mammals. We present an analysis of Calomys musculinus populations using capture-mark-recapture models in order to evaluate the effect of female removal on their demography. The study was carried out in four enclosures during two different periods: a reference period and a treatment period, with the removal of adult females. Reference period was analyzed to describe population demography without manipulations. In treatment period, two control enclosures maintained both parents remained with their offspring whereas other two enclosures had their adult females removed. Seven monthly trapping sessions were carried out (spring to autumn). We estimated apparent survival, recruitment, population growth rates and recapture probabilities. Models considered these parameters constrained to vary as a function of time, enclosure, sex and/or treatment. During the reference period survival and recruitment showed sex and time effects, survival was higher in females and decreased towards June; recruitment showed a peak in February with a higher number of recruited males; population growth rates peaked in February and decreased towards June. During the treatment period survival showed time effect whereas recruitment showed time and treatment effects. Survival was higher at the beginning of the breeding period and decreased afterwards, and recruitment was higher in control enclosures; population growth rates showed a similar pattern than in reference period. There were not differences in growth rates and abundances between control and experimental enclosures. Under our experimental and methodological conditions, the results would indicate that the absence of females in experimental enclosures was not enough to cause a clear impact on final population size.
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Asociación Argentina de Ecología
2012
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Gómez, María D. Steinmann, Andrea R. Priotto, José W. |
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Gómez, María D. Steinmann, Andrea R. Priotto, José W. Demographic response to the manipulation of adult females in corn mouse populations |
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Gómez, María D. Steinmann, Andrea R. Priotto, José W. |
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Gómez, María D. |
| title |
Demographic response to the manipulation of adult females in corn mouse populations |
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Demographic response to the manipulation of adult females in corn mouse populations |
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Demographic response to the manipulation of adult females in corn mouse populations |
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Demographic response to the manipulation of adult females in corn mouse populations |
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Demographic response to the manipulation of adult females in corn mouse populations |
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demographic response to the manipulation of adult females in corn mouse populations |
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Variation in population abundance is a consequence of changes in demographic parameters such as survival and recruitment. These demographic parameters can be affected by intraspecific competition, thus adults may play an important role influencing the survival and/or reproduction of juvenile individuals in many species of small mammals. We present an analysis of Calomys musculinus populations using capture-mark-recapture models in order to evaluate the effect of female removal on their demography. The study was carried out in four enclosures during two different periods: a reference period and a treatment period, with the removal of adult females. Reference period was analyzed to describe population demography without manipulations. In treatment period, two control enclosures maintained both parents remained with their offspring whereas other two enclosures had their adult females removed. Seven monthly trapping sessions were carried out (spring to autumn). We estimated apparent survival, recruitment, population growth rates and recapture probabilities. Models considered these parameters constrained to vary as a function of time, enclosure, sex and/or treatment. During the reference period survival and recruitment showed sex and time effects, survival was higher in females and decreased towards June; recruitment showed a peak in February with a higher number of recruited males; population growth rates peaked in February and decreased towards June. During the treatment period survival showed time effect whereas recruitment showed time and treatment effects. Survival was higher at the beginning of the breeding period and decreased afterwards, and recruitment was higher in control enclosures; population growth rates showed a similar pattern than in reference period. There were not differences in growth rates and abundances between control and experimental enclosures. Under our experimental and methodological conditions, the results would indicate that the absence of females in experimental enclosures was not enough to cause a clear impact on final population size. |
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Asociación Argentina de Ecología |
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2012 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1255 |
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AT gomezmariad demographicresponsetothemanipulationofadultfemalesincornmousepopulations AT steinmannandrear demographicresponsetothemanipulationofadultfemalesincornmousepopulations AT priottojosew demographicresponsetothemanipulationofadultfemalesincornmousepopulations AT gomezmariad respuestademograficaalamanipulaciondehembrasadultasenpoblacionesdelratonmaicero AT steinmannandrear respuestademograficaalamanipulaciondehembrasadultasenpoblacionesdelratonmaicero AT priottojosew respuestademograficaalamanipulaciondehembrasadultasenpoblacionesdelratonmaicero |
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rev-ecoaus-article-12552023-11-02T20:49:20Z Demographic response to the manipulation of adult females in corn mouse populations Respuesta demográfica a la manipulación de hembras adultas en poblaciones del ratón maicero Gómez, María D. Steinmann, Andrea R. Priotto, José W. adult female removal Calomys musculinus population growth recruitment survival Calomys musculinus crecimiento poblacional reclutamiento remoción de hembras adultas sobrevida Variation in population abundance is a consequence of changes in demographic parameters such as survival and recruitment. These demographic parameters can be affected by intraspecific competition, thus adults may play an important role influencing the survival and/or reproduction of juvenile individuals in many species of small mammals. We present an analysis of Calomys musculinus populations using capture-mark-recapture models in order to evaluate the effect of female removal on their demography. The study was carried out in four enclosures during two different periods: a reference period and a treatment period, with the removal of adult females. Reference period was analyzed to describe population demography without manipulations. In treatment period, two control enclosures maintained both parents remained with their offspring whereas other two enclosures had their adult females removed. Seven monthly trapping sessions were carried out (spring to autumn). We estimated apparent survival, recruitment, population growth rates and recapture probabilities. Models considered these parameters constrained to vary as a function of time, enclosure, sex and/or treatment. During the reference period survival and recruitment showed sex and time effects, survival was higher in females and decreased towards June; recruitment showed a peak in February with a higher number of recruited males; population growth rates peaked in February and decreased towards June. During the treatment period survival showed time effect whereas recruitment showed time and treatment effects. Survival was higher at the beginning of the breeding period and decreased afterwards, and recruitment was higher in control enclosures; population growth rates showed a similar pattern than in reference period. There were not differences in growth rates and abundances between control and experimental enclosures. Under our experimental and methodological conditions, the results would indicate that the absence of females in experimental enclosures was not enough to cause a clear impact on final population size. La variación del tamaño de una población obedece a cambios en parámetros demográfi cos tales como sobrevida y reclutamiento. Estos parámetros demográficos pueden estar afectados por la competencia intraespecífica, de modo que los adultos pueden desempeñar un papel importante en la sobrevida y/o la reproducción de los juveniles en muchas especies de mamíferos pequeños. Estudiamos una población de Calomys musculinus utilizando modelos de captura-marcado-recaptura para evaluar el efecto de la remoción de hembras sobre la demografía de la población. El estudio se realizó en cuatro clausuras durante dos períodos: período de referencia y de tratamiento. El período de referencia permitió describir la demografía poblacional sin manipulación mientras que el período de tratamiento evaluó la remoción de hembras. Se realizaron siete sesiones de trampeo mensuales entre primavera y otoño. Se estimaron la sobrevida aparente, el reclutamiento, la tasa de crecimiento poblacional y la probabilidad de recaptura. Los modelos fueron construidos con dichos parámetros restringidos a variar como función del tiempo, la clausura, el sexo y/o el tratamiento. Durante el período de referencia la sobrevida fue mayor en hembras y disminuyó hacia el mes de junio; el reclutamiento mostró un pico en febrero con un mayor número de machos reclutados; la tasa de crecimiento poblacional mostró un pico en febrero y disminuyó hacia junio. Durante el período de tratamiento la sobrevida fue mayor al comienzo del período reproductivo disminuyendo posteriormente y el reclutamiento fue mayor en los controles que en los tratamientos sin hembras; la tasa de crecimiento mostró un patrón similar al del período de referencia. La remoción de hembras no afectó las tasas de crecimiento ni el tamaño poblacional. Bajo nuestras condiciones experimentales y metodológicas, los resultados indicarían que la ausencia de hembras en las clausuras experimentales no fue suficiente para causar un efecto claro en el tamaño final de la población. Asociación Argentina de Ecología 2012-08-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Communications Comunicaciones application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1255 Ecología Austral; Vol. 22 No. 2 (2012): August 2012, Pages 81-158; 121-128 Ecología Austral; Vol. 22 Núm. 2 (2012): August 2012, Pages 81-158; 121-128 1667-782X 0327-5477 eng https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1255/626 Derechos de autor 2020 María D. Gómez, Andrea R. Steinmann, José W. Priotto https://creativecommons.org/licenses/by/3.0/ |