Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina
It has been shown that seasonal changes, especially in arid areas have a large influence on gonadal changes of the species that inhabit these areas. We studied a wild hystricomorph Microcavia australis in its natural habitat in the arid Andes Mountains. Sampling of adult males was carried out every...
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todo:paper_19325223_v313A_n8_p474_Velez2023-10-03T16:34:29Z Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina Velez, S. Sassi, P.L. Borghi, C.E. Monclus, M.A. Fornés, M.W. Hystricognathi Microcavia australis Rodentia animal Argentina article cytochemistry desert climate epididymis histology male nonparametric test organ size physiology rodent season spermatogenesis testis Animals Argentina Desert Climate Epididymis Histocytochemistry Male Organ Size Rodentia Seasons Spermatogenesis Statistics, Nonparametric Testis It has been shown that seasonal changes, especially in arid areas have a large influence on gonadal changes of the species that inhabit these areas. We studied a wild hystricomorph Microcavia australis in its natural habitat in the arid Andes Mountains. Sampling of adult males was carried out every 2 months. After autopsy, testes and epididymides were weighed and processed to obtain histological samples. Testes were analyzed with a microscope to measure seminiferous tubule area and diameter for each sampled month. Epididymides were used to determine spermatozoon storage in the cauda region. Results illustrate morphological changes in the testis and epididymis along the year. A high output of sperm cells was detected from middle winter to middle summer and a complete shutdown of spermatogenesis at the end of summer. The initiation of testicular activity coincided with month with the shortest day length, in dry season and very low temperature. On the other hand, gonadal regression started in the middle of summer with long day length, in the wet season, and high temperatures. Rainfall, temperature, and day length seem to be important for the testis cycle. We suggest that photoperiod could be a good predictor for an oncoming period suitable for breeding, and males may probably use it as a signal to regulate gonadal activity. © 2010 Wiley-Liss, Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_19325223_v313A_n8_p474_Velez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Hystricognathi Microcavia australis Rodentia animal Argentina article cytochemistry desert climate epididymis histology male nonparametric test organ size physiology rodent season spermatogenesis testis Animals Argentina Desert Climate Epididymis Histocytochemistry Male Organ Size Rodentia Seasons Spermatogenesis Statistics, Nonparametric Testis |
| spellingShingle |
Hystricognathi Microcavia australis Rodentia animal Argentina article cytochemistry desert climate epididymis histology male nonparametric test organ size physiology rodent season spermatogenesis testis Animals Argentina Desert Climate Epididymis Histocytochemistry Male Organ Size Rodentia Seasons Spermatogenesis Statistics, Nonparametric Testis Velez, S. Sassi, P.L. Borghi, C.E. Monclus, M.A. Fornés, M.W. Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina |
| topic_facet |
Hystricognathi Microcavia australis Rodentia animal Argentina article cytochemistry desert climate epididymis histology male nonparametric test organ size physiology rodent season spermatogenesis testis Animals Argentina Desert Climate Epididymis Histocytochemistry Male Organ Size Rodentia Seasons Spermatogenesis Statistics, Nonparametric Testis |
| description |
It has been shown that seasonal changes, especially in arid areas have a large influence on gonadal changes of the species that inhabit these areas. We studied a wild hystricomorph Microcavia australis in its natural habitat in the arid Andes Mountains. Sampling of adult males was carried out every 2 months. After autopsy, testes and epididymides were weighed and processed to obtain histological samples. Testes were analyzed with a microscope to measure seminiferous tubule area and diameter for each sampled month. Epididymides were used to determine spermatozoon storage in the cauda region. Results illustrate morphological changes in the testis and epididymis along the year. A high output of sperm cells was detected from middle winter to middle summer and a complete shutdown of spermatogenesis at the end of summer. The initiation of testicular activity coincided with month with the shortest day length, in dry season and very low temperature. On the other hand, gonadal regression started in the middle of summer with long day length, in the wet season, and high temperatures. Rainfall, temperature, and day length seem to be important for the testis cycle. We suggest that photoperiod could be a good predictor for an oncoming period suitable for breeding, and males may probably use it as a signal to regulate gonadal activity. © 2010 Wiley-Liss, Inc. |
| format |
JOUR |
| author |
Velez, S. Sassi, P.L. Borghi, C.E. Monclus, M.A. Fornés, M.W. |
| author_facet |
Velez, S. Sassi, P.L. Borghi, C.E. Monclus, M.A. Fornés, M.W. |
| author_sort |
Velez, S. |
| title |
Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina |
| title_short |
Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina |
| title_full |
Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina |
| title_fullStr |
Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina |
| title_full_unstemmed |
Effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent Microcavia australis from the andes mountains, Argentina |
| title_sort |
effect of climatic variables on seasonal morphological changes in the testis and epididymis in the wild rodent microcavia australis from the andes mountains, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_19325223_v313A_n8_p474_Velez |
| work_keys_str_mv |
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