Three species of freshwater sponges (Porifera): Spongilla lacustris (Linneaus), Eunapius fragilis (Leidy) and Ephydatia muelleri (Lieberkuhn) were identified in four southern Lake Michigan harbors: Belmont (IL), East Chicago (IN), Michigan City (IN) and St. Joseph (MI). Samples were collected from artificial substrates and are the first report of sponges in three of the harbors. Sponge cover on revetment walls, stone rip-rap and wood pier posts ranged up to 13% of the available surface area, whereas no sponges were growing on the soft silt bottom. Eunapius fragilis appeared to be the most common species. An angle-density relationship was observed for sponges growing on the stone rip-rap in Michigan City and East Chicago; as the orientation of the attachment substrate changed from horizontal to vertical, the density of sponges increased.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 146 • No. 2