The worldwide decline in amphibians has been attributed to several causes, especially habitat loss and disease.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/habitat-split-and-global-decline-amphibians
[2] http://admin.indiaenvironmentportal.org.in/category/author/carlos-guilherme-becker
[3] http://admin.indiaenvironmentportal.org.in/category/author/carlos-roberto-fonseca
[4] http://admin.indiaenvironmentportal.org.in/category/author/clio-fernando-baptista-haddad-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/science
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/land-use
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/habitat
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/amphibians
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife-and-people
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/brazil