Monotremes are very highly modified for their particular ecological niches.
I never, ever get to the end of pulling out alkanet, the local taprooted bully of my particular ecological niche.
Even more important than body size and metabolism may be the idiosyncrasies of an animal's lifestyle and its particular ecological role.
Officially, 100,000 old trees in Britain are classed as "veteran", "notable" or "heritage" trees, considered to be of particular ecological or cultural value.
And yet the model also documents the barriers to the evolution of eusociality, since it typically requires a set of unusual mutations and very particular ecological conditions.
In sites where there isn't a native that fits that particular ecological niche, non-natives can be substituted as long as they are not considered invasive.
Each of these miniature habitats flows almost edgelessly into the next, and is meant to be able to sustain its particular ecological character with its distinctive plants.
Because each grass has different needs and habits, it fills a particular ecological niche, and the right matrix of plants keeps diseases from spreading and shuts out weeds, so pesticides are rarely necessary.
Through the process of adaptive radiation, this population might evolve independently into a new species, changing to fit particular ecological niches in the new environment and never requiring natural selection to complete its reproductive isolation from the parent species.
Oil washed into streams and rivers arrives at estuaries and the coast, areas of particular ecological sensitivity.
Animals show varieties of different foraging strategies, each adapted to particular ecological and physical constraints.
