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Scent marking
Date:10/31/2013

Many animals use scent marking to advertise their territory they urinate at strategic locations to communicate their social status and ownership. It has been suggested that markings serves to attract females and potentially warn off competitors. Much like the peacock tail, males' scent marks appear to be a secondary sexual trait, which females evaluate to judge the quality of a potential mate. When male house mice are subordinate or sick, for example, their scent marks become less conspicuous and less attractive to female mice.

Intrusion causes an increase in scent-marking activity

Scientists had already observed that dominant male mice mark their territory more than subordinate males and that competition with other males increases the marking effort, but surprisingly no study ever tested whether scent marking enhances males' mating or reproductive success. Kerstin Thonhauser and colleagues from the Konrad Lorenz Institute of Ethology of the University of Veterinary Medicine therefore set out to test whether scent marking increases males' reproductive success. They manipulated and quantified males' scent markings on PVC tiles that they placed on the floor of each of the males' compartments before males were introduced into their enclosures. To simulate territorial intrusion, after a few days they exchanged all of the tiles in a male's compartment his neighbour's tiles. The researchers confirmed that males deposited more scent marks when they perceived a competitor in their territory than otherwise and that they took special pains to mark the borders of their territory. Subsequently the scientists let female mice choose to interact and mate with either one, or both of two unrelated males, each in their own territory.

Better markers have more offspring

Their genetic analysis of the females offspring showed that males that deposited more scent marks had higher reproductive success than other males. "Our s
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Contact: Susanna Kautschitsch
susanna.kautschitsch@vetmeduni.ac.at
43-125-077-1153
University of Veterinary Medicine -- Vienna
Source:Eurekalert  

Page: 1 2

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