Escarabajos coprófagos (Col. Scarabaeoidea) asociados a hongos en la Sierra Madre Occidental, Durango, México: con una compilación de las especies micetófagas
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| Natura: | Artículo científico |
| Lingua: | en |
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Instituto de Ecología, A.C.
2000
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| _version_ | 1876481036816220160 |
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| author | Sofia Anduaga |
| author_facet | Sofia Anduaga |
| contents | Escarabajos coprófagos (Col. Scarabaeoidea) asociados a hongos en la Sierra Madre Occidental, Durango, México: con una compilación de las especies micetófagas Sofia Anduaga Biología Hormones Reproduction Seasonal cycles Gopherus flavomarginatus This study describes sex-steroid cycles of free-living male and female Bolson tortoises at the MapimiBiosphere Reserve in northeastern Durango, Mexico. Blood samples were taken at biweekly intervals duringa 14 month period by jugular venipuncture, and plasma levels of steroids were determined usingradioimmunoassays. Hormone levels showed seasonal trends. In females testosterone peaked followingemergence, associated with increased sexual receptivity, and estradiol increased after emergence inassociation with follicular maturation. These two steroids increased with seasonal rains, when follicularenlargement and vitellogenesis occurred. Females emerged from brumation with low levels of progesterone, González-Trápaga et al.: Sex-steroids and reproductive cycle in bolson tortoise102which increased with daylength and temperature and reached a maximum before the peak of egg-laying.Declines in all three hormones were associated with oviposition. Females probably store sperm duringbrumation for use during the following season. Males emerged after brumation with low testosterone levelsand soon exhibited reproductive behavior. Along with a testosterone rise, mating and courtship increased withenvironmental cues and extended until early fall. Testosterone levels and reproductive activity decreased asbrumation approached. Male peak testosterone levels are higher than those reported for any vertebrate. 2000 artículo científico 0065-1737 https://www.redalyc.org/articulo.oa?id=57508005 en http://www.redalyc.org/revista.oa?id=575 Acta Zoológica Mexicana (nueva serie) application/pdf Instituto de Ecología, A.C. Acta Zoológica Mexicana (nueva serie) (México) Num.80 |
| format | Artículo científico |
| id | redalyc_57508005 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Instituto de Ecología, A.C. |
| spellingShingle | Escarabajos coprófagos (Col. Scarabaeoidea) asociados a hongos en la Sierra Madre Occidental, Durango, México: con una compilación de las especies micetófagas Sofia Anduaga Biología Hormones Reproduction Seasonal cycles Gopherus flavomarginatus Escarabajos coprófagos (Col. Scarabaeoidea) asociados a hongos en la Sierra Madre Occidental, Durango, México: con una compilación de las especies micetófagas Sofia Anduaga Biología Hormones Reproduction Seasonal cycles Gopherus flavomarginatus This study describes sex-steroid cycles of free-living male and female Bolson tortoises at the MapimiBiosphere Reserve in northeastern Durango, Mexico. Blood samples were taken at biweekly intervals duringa 14 month period by jugular venipuncture, and plasma levels of steroids were determined usingradioimmunoassays. Hormone levels showed seasonal trends. In females testosterone peaked followingemergence, associated with increased sexual receptivity, and estradiol increased after emergence inassociation with follicular maturation. These two steroids increased with seasonal rains, when follicularenlargement and vitellogenesis occurred. Females emerged from brumation with low levels of progesterone, González-Trápaga et al.: Sex-steroids and reproductive cycle in bolson tortoise102which increased with daylength and temperature and reached a maximum before the peak of egg-laying.Declines in all three hormones were associated with oviposition. Females probably store sperm duringbrumation for use during the following season. Males emerged after brumation with low testosterone levelsand soon exhibited reproductive behavior. Along with a testosterone rise, mating and courtship increased withenvironmental cues and extended until early fall. Testosterone levels and reproductive activity decreased asbrumation approached. Male peak testosterone levels are higher than those reported for any vertebrate. 2000 artículo científico 0065-1737 https://www.redalyc.org/articulo.oa?id=57508005 en http://www.redalyc.org/revista.oa?id=575 Acta Zoológica Mexicana (nueva serie) application/pdf Instituto de Ecología, A.C. Acta Zoológica Mexicana (nueva serie) (México) Num.80 |
| title | Escarabajos coprófagos (Col. Scarabaeoidea) asociados a hongos en la Sierra Madre Occidental, Durango, México: con una compilación de las especies micetófagas |
| topic | Biología Hormones Reproduction Seasonal cycles Gopherus flavomarginatus |
| url | https://www.redalyc.org/articulo.oa?id=57508005 |