Genetic diversity affects testicular morphology in free-ranging lions (Panthera leo) of the Serengeti Plains and Ngorongoro Crater
| Autor: | Janine L. Brown, Linda Munson, Craig Packer, David E. Wildt, D. Janssen, S. M. Reiziss, Mitchell Bush |
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| Rok vydání: | 1996 |
| Předmět: |
Lions
Male Embryology media_common.quotation_subject Population Captivity Zoology Endocrinology Impact crater biology.animal Testis Animals Genetic variability Spermatogenesis education media_common education.field_of_study Genetic diversity Sperm Count biology Ecology Genetic Variation Obstetrics and Gynecology Cell Biology Seminiferous Tubules Spermatids Reproductive Medicine Africa Panthera Reproduction Inbreeding |
| Zdroj: | Reproduction. 108:11-15 |
| ISSN: | 1741-7899 1470-1626 |
| Popis: | Reduced genetic variability is known to adversely affect ejaculate quality in inbred lions (Panthera leo) physically isolated in the Ngorongoro Crater compared with outbred lions inhabiting the adjacent Serengeti Plains in East Africa. This study compared the histomorphology of testicular biopsies from these two lion populations. Ngorongoro Crater lions had fewer (P0.05) seminiferous tubules with spermiogenesis and fewer (P0.05) spermatids per seminiferous tubular cross-section than Serengeti Plains lions, although seminiferous tubular diameter did not differ (P0.05) between populations. Interstitial areas were greater (P0.05) in Crater than in Plains lions, but no qualitative differences were evident, suggesting that proportionately less testicular area was occupied by seminiferous tubules in Crater lions. None of the lions in either population had evidence of testicular degeneration. Overall results suggest that inbred Crater lions have reduced spermiogenesis and less total seminiferous tubular area per testis. These data further support the premise that genetic homogeneity compromises reproductive traits in free-living, male African lions. |
| Databáze: | OpenAIRE |
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