Evaluation of the Population Status of the Tumbling Creek Cavesnail (Hydrobiidae: Antrobia culveri). (Speleology Section).Ashley, D.C. (1), P. McKenzie (2), P. Haverland (3), and T. Aley (4). (1) Department of Biology, Missouri Western State College, (2) Ecological Services, U.S. Fish and Wildlife Service, (3) Midwest Science Center, National Biological Service, and (4) Ozark Underground Laboratory. EVALUATION OF THE POPULATION STATUS OF THE TUMBLING CREEK CAVESNAIL The tumbling creek cavesnail (Antrobia culveri) is a species of gastropod in the Hydrobiidae family. It is endemic to the United States. Source
According to the U.S. . A stratified sampling Noun 1. stratified sampling - the population is divided into subpopulations (strata) and random samples are taken of each stratum proportional sampling, representative sampling sampling - (statistics) the selection of a suitable sample for study scheme was developed in 1996 to monitor the population of this endemic endemic /en·dem·ic/ (en-dem´ik) present or usually prevalent in a population at all times. en·dem·ic adj. 1. snail snail, name commonly used for a gastropod mollusk with a shell. Included in the thousands of species are terrestrial, freshwater, and marine forms. Some eat both plant and animal matter; others eat only one type of food. . The snail population has been censused thirteen times in the last five years. This monitoring project provides evidence that snail populations have decreased substantially. Data on snail size class distributions suggest a decrease in recruitment of young individuals into the population has occurred. We were unable to find a single specimen of A. culveri during the last cave visit. This project was funded i n part by a grant from the U.S. Fish and Wildlife Service |
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