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Aestivation (Latin: aestas (summer); also spelled estivation in American English) is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. [ 1 ]
Aestivation or estivation is the positional arrangement of the parts of a flower within a flower bud before it has opened. Aestivation is also sometimes referred to as praefoliation or prefoliation , but these terms may also mean vernation : the arrangement of leaves within a vegetative bud.
Species go extinct constantly as environments change, as organisms compete for environmental niches, and as genetic mutation leads to the rise of new species from older ones. At long irregular intervals, Earth's biosphere suffers a catastrophic die-off, a mass extinction , [ 9 ] often comprising an accumulation of smaller extinction events over ...
The human population exploits and depends on many animal and plant species for food, mainly through agriculture, but also by exploiting wild populations, notably of marine fish. [ 10 ] [ 11 ] [ 12 ] Livestock animals are raised for meat across the world; they include (2011) around 1.4 billion cattle , 1.2 billion sheep and 1 billion domestic pigs .
The subfield ethnozoology focuses on the relationship between humans and other animals throughout human history. It studies human practices such as hunting, fishing and animal husbandry in space and time, and human perspectives about animals such as their place in the moral and spiritual realms. [citation needed]
Sympatric speciation – Evolution of a new species from an ancestor in the same location; Artificial speciation Animal husbandry – Management of farm animals; Plant breeding – Humans changing traits, ornamental/crops; Genetic engineering – Manipulation of an organism's genome
It has been suggested that many of the existing plant and most animal species have undergone an event of polyploidization in their evolutionary history. [254] [258] Reproduction of successful polyploid species is sometimes asexual, by parthenogenesis or apomixis, as for unknown reasons many asexual organisms are polyploid. Rare instances of ...
Display behaviour is a set of ritualized behaviours that enable an animal to communicate to other animals (typically of the same species) about specific stimuli. [1] Such ritualized behaviours can be visual, but many animals depend on a mixture of visual, audio, tactical and chemical signals. [ 1 ]