August 2004 - FMCS-Freshwater Mollusk Conservation

Figure 1. Map of known occurrences of Melanoides tuberculatus (Müller, 1774) in the United States.
Counties with occurrences are colored according to the first report of the species in that county.
Phase I of Pennsylvania Aquatic Community Classification Complete
Betsy Nightingale 1 , Mary Walsh 1 , D. David Homans 2 , Ryan Evans 2 , Jeremy Deeds 2 , and Emily Bond 3
Pennsylvania Natural Heritage Program
1 The Nature Conservancy, PA Science Office, 208 Airport Drive, Middletown, PA 17057, c-bnightin@state.pa.us
2 Western Pennsylvania Conservancy, 209 4 th Ave., Pittsburgh, PA 15222, jdeeds@paconserve.org
3 Michael Baker Corporation, 100 Airside Drive, Moon Township, PA 15108
Pennsylvania Natural Heritage Program biologists have recently completed the pilot phase of a statewide classification of
aquatic communities. In this preliminary classification, a variety of methods were used to classify stream communities of
macroinvertebrates, fish and mussels in eight Pennsylvania watersheds. The complete Phase I report is available online
(http://www.paconserve.org/rc/acp.html), and a summary of the mussel community classification results is provided here.
Mussel and physical habitat data (adjacent land use, water chemistry, habitat quality, and stream hydrology) for Pennsylvania
streams were acquired from more than 30 sources, principally from PA DEP, EPA EMAP, and The Nature Conservancy
Freshwater Initiative. Data were also acquired from universities, museums, conservation groups, and individuals. Cluster
Analysis, Indicator Species Analysis, and Nonmetric Multidimensional Scaling were used to classify communities of mussels,
and Canonical Correspondence Analysis (CCA) was used to examine relationships among community types and physical
habitat characteristics.
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