Modelling population dynamics of the Common hamster (Cricetus cricetus): Timing of harvest as a critical aspect in the conservation of a highly endangered rodent

摘要: The Common hamster Cricetus cricetus was an agricultural pest in large parts of Europe less than 50 years ago. Currently the species is highly threatened or locally extinct and acknowledged as important even iconic for nature conservation farmland areas Western Europe. listed European habitats directive 1992 to prevent a further decline, but still declining most its range despite efforts. Only few local successes have been reported so far. These disappointing results raise question: why it difficult conserve this former species? Farming practices intensified has resulted more efficient way harvesting cereals combination with strong reduction spring sown favour winter cereals. It possible that these changes become threat survival populations species. We developed both deterministic stochastic population model better understanding current on ecology evaluated effects using different litter sizes growth persistence. Our suggest under harvest Europe, unlikely females produce enough offspring sustainable population. Conservation projects should focus creating cereal fields which are not harvested until end August, lack cover major cause high predation rates.