نتایج جستجو برای: elephants
تعداد نتایج: 2148 فیلتر نتایج به سال:
In seasonal environments, many species concentrate their reproduction in the time of year most likely to maximize offspring survival. Asian elephants (Elephas maximus) inhabit regions with seasonal climate, but females can still experience 16-week reproductive cycles throughout the year. Whether female elephants nevertheless concentrate births on periods with maximum offspring survival prospect...
Abstract Providing good animal welfare standards is very important for wild animals in captivity, especially zoos. Therefore, the aim of this study was to perform a assessment elephants Skopje Zoo using species-specific protocols. Two specific protocols were used and combined more unified approach. These focused on elephant’s day-time behaviour, including Qualitative Behaviour Assessment (QBA),...
Concern about climate change has intensified interest in understanding how climatic variability affects animal life histories. Despite such effects being potentially most dramatic in large, long-lived, and slowly reproducing terrestrial mammals, little is known of the effects of climatic variation on survival in those species. Asian elephants (Elephas maximus) are endangered across their distri...
Erwin H. Bulte et al. (2003) note that the rules of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) ban trade in products from endangered but not extinct species. They argue that governments may therefore have incentives to strategically kill off all their elephants so as to secure the end of the ban on ivory trading. This incentive will be stronger i...
In the last decade clear evidence has accumulated that elephants are capable of vocal production learning. Examples of vocal imitation are documented in African (Loxodonta africana) and Asian (Elephas maximus) elephants, but little is known about the function of vocal learning within the natural communication systems of either species. We are also just starting to identify the neural basis of e...
The occurrence of musth, a period of elevated levels of androgens and heightened sexual activity, has been well documented for the male Asian elephant (Elephas maximus). However, the relationship between androgen-dependent musth and adrenocortical function in this species is unclear. The current study is the first assessment of testicular and adrenocortical function in free-ranging male Asian e...
Palaeogenomes of Eurasian straight-tusked elephants challenge the current view of elephant evolution
The straight-tusked elephants Palaeoloxodon spp. were widespread across Eurasia during the Pleistocene. Phylogenetic reconstructions using morphological traits have grouped them with Asian elephants (Elephas maximus), and many paleontologists place Palaeoloxodon within Elephas. Here, we report the recovery of full mitochondrial genomes from four and partial nuclear genomes from two P. antiquus ...
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