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Major Hurricanes along the North Gulf Coast of Florida Affect Adult Survival Rates of the Endangered Florida Manatee
Understanding how animal populations respond to hurricanes has generally been limited by a lack of critical prehurricane data necessary to make poststorm comparisons. This study presents the first empirical evidence for the storm effects on manatee-survival rates and was based on 19 years of photo-identification data. Identifying and understanding hurricane effects for this species and others is critical for short- and long-term planning by researchers, managers, and policymakers. The study identified lower survival rates in 1985 with Hurricanes Elena and Kate, in 1993 with the March "Storm of the Century" that impacted the entire east coast, and in 1995 with Hurricane Opal. These storms were category 3 or greater on the Saffir-Simpson scale. The decreases in manatee survival could be due to direct mortality, indirect mortality, and (or) emigration from the region as a consequence of storms. Future impacts to the population by a single catastrophic hurricane, or by a series of smaller hurricanes, could increase the probability of manatee extinction. With the advent in 1995 of a new 25- to 50-year cycle of greater hurricane activity and intensity identified by meteorologic researchers, and longer-term change possible with global climate change, the study concludes that it becomes all the more important to reduce manatee mortality and injury from boats and other human causes and to control the loss of foraging habitat to coastal development. Recent publications on manatees from the Center for Aquatic Resource Studies:
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in this issue:
cover story: Ecologically Sensitive Islands in the Bering Sea Track Florida's Manatees Via Web Site New Map Poster for Falmouth, MA Science Teachers Visit Woods Hole USGS Landsat Images Appear in Textbook Scientists Give "Telelecture" to Louisiana Students USGS Landsat Image Featured at Museum Manheim Lectures in Ireland and Sweden Saltwater Intrusion and Coastal Aquifers Natural Science and Better Health New Chief Scientist for Western Coastal and Marine Team Mendenhall Fellows Lecture in Reston, VA Mendenhall Fellow Joins Coral Reef Project Netherlands Scientist Visits Woods Hole USGS Employees Find Avocation in Blacksmithing Manatee Hurricane Survival Paper |