Encyclopedias have entries that cover a topic - how in-depth depends on the encyclopedia, and the topic.
Online encyclopedias allow you to search the whole publication with key words.
Try some of these to find information about habitat fragmentation or biological corridors.
Environmental Encyclopedia - Provides in-depth, world-wide coverage of environmental issues.
Grzimek's Animal Life Encyclopedia - Online version of the illustrated zoology encyclopedia.
Water: No Longer Taken for Granted - Focuses on the social and moral issues surrounding water resources.
International Encyclopedia of the Social Sciences - Highlights the expanding influence of economics in social science research
Encyclopedia of Animal Behavior
Covers communication, learning, sexual selection, navigation, and the history of the field; also emerging topics in cognition, animal welfare, conservation, and applications of animal behavior.