Title:

Two ageing methods for muskrats: live or dead animals

Creator:

Le Boulengé, E.

Place of publishing:

Białowieża

Date issued/created:

1977

Description:

A new method is presented for ageing living muskrats, Ondatra zibethicus (Linnaeus, 1766). It consist of fitting a second-order polynomial to a set of measurements of tail length, taken at various ages of an unknown-age animal. The birth date is estimated as the time at which tail length equals the mean tail length for muskrats at birth.Tested with known-age muskrats, this method yields unbiased estimates, even for animals two months old when first measured. It is moreover based on sounder assumptions than the >>classical<< age estimation by reference to a growth curve calibrated on known-age animals. Przedstawiono nową metodę określania wieku u piżmaka Ondatra zibethicus (Linnaeus, 1766), polegająca na wykorzystaniu pomiarów długości ogona i użyciu przy porównaniach wielomianu drugiego rzędu. ponadto określano wiek na podstawie ciężaru soczewki. Stwierdzono przy tym, że tempo wzrostu soczewki u piżmaków trzymanych w niewoli jest wolniejsze niż u osobników żyjących na swobodzie.

Type of object:

Journal/Article

Subject and Keywords:

ageing methods ; crystalline lens weight ; Ondatra zibethicus ; tail length ; muskrat ; określanie wieku ; piżmak

Relation:

Acta Theriologica

Volume:

22

Issue:

34

Start page:

509

End page:

520

Resource type:

Text

Detailed Resource Type:

Article

Format:

application/pdf

Resource Identifier:

10.4098/AT.arch.77-46

Source:

click here to follow the link

Language:

eng ; sum. eng. ; pol.

Rights:

Rights Reserved - Free Access

Terms of use:

Copyright-protected material. May be used within the limits of statutory user freedoms

Digitizing institution:

Mammal Research Institute of the Polish Academy of Sciences

Original in:

Library of the Mammal Research Institute Polish Academy of Sciences

Projects co-financed by:

Programme Innovative Economy, 2010-2014, Priority Axis 2. R&D infrastructure ; European Union. European Regional Development Fund

Access:

Open