Identification of cholla species requires a working sense of what a species is.We use the following two considerations as our guide to defining a species.Species are “clusters of monotypic or polytypic biological entities, identified using morphology or genetics, forming groups that have few or no...
When parent-offspring relations in sexually reproducing species are viewed from the standpoint of the offspring as well as the parent, conflict is seen to ... LT L. Trivers - 《Current Biology Cb》 被引量: 846发表: 1974年 Behavioural ecology of pinniped neonates Although the social organizatio...
Using the app, you ‘scan’ or photograph the plant, and you’ll see a result when it has reached genus, then species. Once you have identified the plant by species, it will then be saved under ‘My Observations.” These observations are only stored onyour phone. Here are a few plants...
Like other species, we are the products of millions of years of adaptation. Now we're taking matters into our own hands.
When similar species are rare, road maintenance personnel typically correctly identifies the most common road-killed small wild canids and felids. However, common small canids and felids are not reliably identified if similar species are more abundant. To improve the reliability of species ...
Nine functional response groups (RG) and seven functional effect groups (EG) were identified with considerable overlap in the RG and EG species grouping. Three RGs had traits characteristic of forests (spring flowering herbs, tree saplings and shrubs/ climbers), one RG had traits characteristic ...
The majority of pheromones identified to date are insect pheromones, which are volatile in nature. Identification of nonvolatile pheromones have been relatively rare, especially in vertebrates. Male and female garter snakes use pheromone... R Mason,H Fales,T Jones,... - 《Science》 被引量: 364...
Two contrasting results emerge from comparisons of the social systems of several odontocetes with terrestrial mammals. Researchers have identified remarkab... Richard C Connor a,Janet Mann b,Peter L Tyack c,... - 《Trends in Ecology & Evolution》 ...
Although there are three distinct hyena species, the best known and largest is also the most stereotypical.Spotted hyenasare also called ‘laughing hyenas’ because of their distinctive vocalizations. Hyena tracks can be identified using the following clues: ...
6). They are analysed here as mixes of generic elements that may be hierarchically ordered within a text and may realise different functions (Fairclough, 2003, pp. 70–71). The generic elements of texts can be identified by attending to their purposes and functions, as well as their ...