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Airoldi, J.-P. (1978). Study through capture and recapture of a population of water voles, Arvicola terrestris scherman Shaw (Mammalia, Rodentia). Terre et Vie 32 : 3-45. (In French,
 

Summary: Airoldi, J.-P. (1978). Study through capture and recapture of a population of water voles,
Arvicola terrestris scherman Shaw (Mammalia, Rodentia). Terre et Vie 32 : 3-45. (In French,
English summary)
A semi-isolated population of the fossorial form of the Water vole, Arvicola terrestris scherman
Shaw, was studied by the capture-recapture method, over an area of 700 m≤ from July 1975 to
May 1976. A series of 15 trapping periods lasting 2 days each and normally comprising 9 trap
checks a day were carried out at intervals of three weeks. The trapping effort varied between 526
and 950 trap-hours. Traps were very quickly occupied and an average of 80 % (70-95 %) of the
population caught within 2 days. Individuals were captured and recaptured at an average of 4.2
(2.7-6.5) times per trapping period. The average numbers of trap changes (mean = 1.7) and of
different traps occupied (mean = 1.9) correlated with the mean number of captures; the recaptures
allowed to establish the relationships between individuals and set the boundaries of their home
ranges with reasonable precision.
The methods of population estimation based on a regression line or on the ratio between marked
and unmarked individuals do not agree with the actual population size, whose best approximation
is given by the calendar of captures. Those using the distribution of capture frequencies generally
coincide better. The population density reached a maximum in November and in April and a
minimum at the beginning of March. Breeding ceased at the middle of August and started again
at the middle of March. During the breeding period, the turnover index between two trapping
periods was 1.38. The survival of cohorts born between July and November was different for

  

Source: Airoldi, Jean-Pierre - Zoologischen Institut, Universitšt Bern

 

Collections: Environmental Sciences and Ecology