Recovery of the otter Lutra lutra in Denmark monitored by field surveys and collection of carcasses

摘要: The otter Lutra lutra suffered serious declines in Denmark during the 1960s and 1970s. A series of conservation management projects were initiated to protect remnant population, including national surveys collection carcasses. recovery since 1980s was described by four field 1984-86, 1991, 1996 2004 following standard survey method, geographical distribution carcasses collected 5-year periods prior surveys. document a substantial increase range past 20 years. number increased annually 9.1 ± 0.7% (mean S.E.) between 1980-2003. spatial period correlated with regional site occupancy implemented practices are presented discussed. We conclude that method is reliable monitor Danish habitats, that compiling records casualties suitable methods long-term population trends.