Atypical Tabularia in Coastal Lake Erie, USA
نویسندگان
چکیده
Tabularia populations collected at a coastal site in Lake Erie, near Cleveland, Ohio, USA exhibit highly abnormal morphology. Frustules may be bent, asymmetric, have irregular striae patterns, irregular margins, or any combination of these characters. The majority of specimens in the collection are abnormal to some degree. Although specimens are so atypical that identification is difficult, relatively simple morphometric analysis shows that morphologies similar to most described members of the genus are present in the collection. Tabularia is probably not indigenous to the Laurentian Great Lakes but occurs in areas that have been highly modified, particularly by saline discharges. The collection site is subject to such discharges, and also to other industrial contaminants. The abnormalities present may be related to these factors, or simply to stresses imposed on species growing out of their preferred habitat. In any case, the occurrence of numerous forms of Tabularia in a localized area where it is not native is remarkable.
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