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Raveh, Shirley (2004) Colour vision in chamois (Rupicapra r. rupicapra)


Diese Auswertung wurde erstellt von: Andreas Boldt

 

SPORTARTEN

Landgebundener Sport, Wandern/Geländelauf

 

INHALT COLOUR VISION IN CHAMOIS: AN EXAMINATION OF THE RETINA

In many ungulates colour vision has been confirmed, however colour vision in chamois is not yet proofed. In connection with tourism and wildlife we investigated whether chamois, a common ungulate living in the mountains, possess the structure allowing colour vision. We procured and examined four retinas of two chamois by using the immunohistochemistry method with two antibodies that have been shown to label shortwavelength-sensitive cones (S-cones, JH 455) and middle-wavelength-sensitive cones (M-cones, JH492) in a wide range of mammals. In the chamois, the antisera clearly distinguished two cone types. The retina of the chamois contains a lower number of S-cones and a higher number of M-cones, as generally found in the mammalian retina. Accordingly, the result leads to the conclusion, that chamois possess at least dichromatic colour vision (blue and green).

 

COLOUR DISCRIMINATION IN CHAMOIS: A BEHAVIOURAL STUDY

The aim of this investigation was to obtain information concerning the possession of colour vision in chamois. The examination included two chamois which were trained on an operant conditioning task consisting of two boxes, where a positive bright stimulus light (green) and a neutral dim stimulus light (blue) were presented. The criterion for learning was set at a threshold of 80 % correct performances. After the animals learned to operate the apparatus, they did not achieve the threshold, therefore the test could not be carried out as planned. The test would have differed from the conditioning phase as the colours were planned to be presented with changed brightness: bright blue and dim green. A choice of green in spite of the changed brightness would have lead to the suggestion, that chamois can use colour vision for discrimination.

 

REACTION OF FEMALE CHAMOIS TO DIFFERENTLY COLOURED RAINCOATS

From June to August 2003 we investigated the reactions of female alpine chamois Rupicapra r. rupicapra to people wearing differently coloured raincoats. At two natural licks in an area of the Bernese Oberland (Swiss Alps) two different experimental designs were carried out. At one of these licks, preferred by suckling females, a person wearing various coloured jackets approached a focal animal on a trail located above it. The reactions (escape distance, site of refuge after the experiment) did not differ between the differently coloured jackets. At the other lick, the investigator wearing coloured raincoats presented herself above the focus animal without moving. The frequency and total time of vigilance behaviour before and during the experiment did not differ between the colours of the jackets. Hence, variously coloured sportswear did not elicit different reactions in chamois. There is a possibility that in spite of possessing colour vision the animals did not react, or that the chamois can not perceive colours and were not even influenced by the variation of the brightness in the colours.

Keywords: chamois, colour vision, brightness, coloured raincoats, escape distance, vigilance behaviour, retina, cone, immunohistochemistry, operant conditioning

 

SCHLUSSFOLGERUNGEN DES/DER AUTOR(INN)EN

S. Abstract

 

BEZUG/QUELLE

Dr. Andreas Boldt
WildARK
Tillierstrasse 6a
CH-3005 Bern
andreas.boldt@wildark.ch


UNTERSUCHUNGSGEBIET (Geo-Objekt, Naturraum, Bundesland)

Augstmatthorn, Berner Oberland, Schweiz