منابع مشابه
Reduced heterozygosity impairs sperm quality in endangered mammals.
Inbreeding causes increases in homozygosity and is commonly associated with reductions in fertility and embryogenesis. Although the mechanisms underlying such effects are unknown, recent work has suggested that inbred males may suffer impaired ejaculate quality, thus providing a functional explanation for reductions in reproductive function in inbred populations. However, the relationship betwe...
متن کاملHeterozygosity-fitness correlations and inbreeding depression in two critically endangered mammals.
The relation among inbreeding, heterozygosity, and fitness has been studied primarily among outbred populations, and little is known about these phenomena in endangered populations. Most researchers conclude that the relation between coefficient of inbreeding estimated from pedigrees and fitness traits (inbreeding-fitness correlations) better reflects inbreeding depression than the relation bet...
متن کاملGlobal Patterns of Evolutionary Distinct and Globally Endangered Amphibians and Mammals
BACKGROUND Conservation of phylogenetic diversity allows maximising evolutionary information preserved within fauna and flora. The "EDGE of Existence" programme is the first institutional conservation initiative that prioritises species based on phylogenetic information. Species are ranked in two ways: one according to their evolutionary distinctiveness (ED) and second, by including IUCN extinc...
متن کاملAn Overview of Sex Selection at Conception in Mammals
Although the mechanisms under which sex ratio is controlled in nature remain unknown, researchers have attempted to treat sperm in an effort to predetermine the sex of the offspring. The methods of sperm separation that have been repeatedly reported to isolate fractions rich in X- or Y-chromosome bearing sperm are serum albumin gradient swim-up and flow cytometry. However, the ability of the se...
متن کاملProtecting and extending fertility for females of wild and endangered mammals.
The forces that are relentlessly pressuring wild animals are well-established and include the loss, fragmentation, pollution, and over-exploitation of habitat as well as emerging diseases, invasive species, and direct human activities, including hunting and urban sprawl. A major contemporary concern also is climate change, which alters how and where animals live. There now are objective data re...
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ژورنال
عنوان ژورنال: Oryx
سال: 1968
ISSN: 0030-6053,1365-3008
DOI: 10.1017/s0030605300007328