Much difficult habitat restoration will be required to assure the long-term viability of these grizzlies.
The difficult habitat and retiring nature of the invisible rail mean that information on its lifestyle is sparse, and there are few confirmed sightings.
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.
Reptiles vary in their degree of ecological specialization, and many live in difficult-to-sample habitats.
In the future, scientists like UW's Kelly envision using eDNA to determine marine biodiversity in difficult-to-sample habitats like rocky ocean bottoms that cannot be trawled.
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 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.
While direct measurement of toad density in upland or riparian habitats is difficult, an ongoing mark-recapture study using drift fence arrays and breeding chorus sampling should help in estimating that density in the near future.
Recently, the usage of video and still images in biogeographic, ecological, and taxonomic studies of deep-sea species has become common and vital tool for describing both species and faunas in habitats logistically difficult to sample like the deep sea[21], [33] [36].
