Caryophyllaceae (pink or carnation family) includes a number of important plants known for their unusual beauty, nutritional value, or peculiar adaptations to difficult habitats.
Along the last 5 of its 100 miles, the river is enclosed by steel walls and dredged regularly for commercial ships, making it difficult for habitats to recover.
Distinguishing between these hypotheses is difficult as habitats with cool, highly oxygenated water, i.e., mountain streams, are often fast flowing.
Mechanistic models have been a useful tool to simulate this process at a lake level, but models require more input information than deterministic models to generate accurate results making it difficult to predict habitat quality of lakes in remote locations.
The spatial distributions of marine mammals are difficult to predict using habitat modelling at ecological scales because of insufficient understanding of their habitat needs, however, relevant information may be available from surveys conducted to inform mandatory stock assessments.
For species whose decline preceded the modern era and whose distribution is in the developing world, it is difficult to map suitable habitat across its former range.
Managing conifers within sage-grouse habitat is difficult because of the necessity to maintain the majority of the landscape in sagebrush habitat and because the threshold for negative conifer effects occurs fairly early in the successional process.
Thus, the effect of drift in small populations may be difficult to estimate from habitat size alone, but depend rather on the mating system or the founding history.
The Department for Environment, Food and Rural Affairs (Defra) argues that it is difficult to identify suitable habitats for the porpoises, but this is disputed by conservationists.
