Planners are traditionally concerned with issues such as scenery, historic resources, agriculture, water supply, and recreation, but are also increasingly becoming aware of the importance biological resources. Because few public or private land use agencies are versed in biological conservation, Hudsonia has synthesized 20 years of experience in identifying significant habitats and rare species occurrences at parks and development sites into a manual for land trusts, environmental and citizens’ groups, planners, and consultants. The Biodiversity Assessment Manual for the Hudson River Estuary Corridor (Kiviat and Stevens 2001) is changing the face of environmental planning in the Hudson Valley and serves as a model for other regions.

An early Hudsonia study produced a widely-used book on the Shawangunk Mountains (Kiviat 1988b). A synthesis on the Hackensack Meadowlands, New Jersey, identifies biological resources in an extensive urban wetland complex (Kiviat and MacDonald 2002). Our work on proposed landfill sites in the Hudson Valley resulted in the discovery of a previously unreported community, the calcareous wet clay meadow (Kiviat et al. 1993, 1994; Groffman et al. 1996). Numerous other studies have turned up rare species on calcareous ledges, in oak-heath barrens, on marble knolls, and in fens, tidal marshes and kettle shrub pools. Recently we have conducted survey work resulting, for example, in the discovery of rare plants in Manhattan and Queens (New York City). Other biological assessments have been conducted in Ohio, New Jersey, Connecticut, and Massachusetts. We have also been involved in the design, management, and monitoring of nature reserves and public parks, in collaboration with public and private conservation agencies.

Hudsonia biologists have studied rare or vulnerable biota and their habitats, including eastern prickly-pear, goldenclub (Kiviat 1976), pine barrens treefrog, common raven (Mihocko 1999), common moorhen (Bannor & Kiviat 2002), and cerulean warbler (Barbour & Kiviat, in preparation). Bard graduate students have studied additional species with assistance from Hudsonia, including Blanding’s turtle (Emrich 1991), northern cricket frog (Dickinson 1993), and monkeyflowers (Sharma 1993).

Click here to see the 2010 article on biodiversity in the town of Dover.



Bannor, B. & E. Kiviat. 2002. Common moorhen (Gallinula chloropus). Birds of North America 685. 27p.

Dickinson, R. 1993. Northern cricket frog (Acris crepitans) survey in Ulster County, New York, 1992. M.S. thesis, Bard College.

Emrich, M. 1991. The creation of artificial nesting sites for the Blanding’s turtle (Emydoidea blandingii). M.S. thesis, Bard College.

Groffman, P.M., G.C. Hanson, E. Kiviat & G. Stevens. 1996. Variation in microbial biomass and activity in four different wetland types. Soil Science Society of America Journal 60:622-629.

Kiviat, E. 1988. The northern Shawangunk Mountains; an ecological survey. Mohonk Preserve, New Paltz, NY. 107p.

Kiviat, E., P.M. Groffman, G. Stevens, S. Nyman & G.C. Hanson. 1994. Reference wetlands in eastern New York. Hudsonia Ltd., Annandale, NY. 94 p.

Kiviat, E. & K. MacDonald. 2002. Hackensack Meadowlands, New Jersey, biodiversity: A review and synthesis. Hackensack Meadowlands partnership.

Kiviat, E. & G. Stevens. 2001. Biodiversity Assessment Manual for the Hudson River Estuary Corridor. New York State Department of Environmental Conservation. 508 p.

Sharma, V. 1993. Habitats of the monkeyflowers Mimulus alatus and Mimulus ringens on the Hudson River. M.S. thesis, Bard College.

Hudsonia, a tax-exempt not-for-profit corporation of the State of New York, classified 501(c)(3) by the Internal Revenue Service, relies on the generous, tax-deductible contributions from members of our community to sustain our research and education. We appreciate your support of our work.