Tag Archives: Behavioral Ecology

Science & Technology

Lady flies can decide who will father their young

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Females in the animal kingdom have many methods available to them to help bias male paternity. One such process is displayed by Euxesta bilimeki, a species of Ulidiid fly, whose females expel and then consume male ejaculate after copulation. A new study by Christian Rodriguez-Enriquez and his colleagues from the Instituto de Ecologia in Mexico has been researching the possible reasons why the female of this species might adopt this behavior. Their study is published in the Springer journal Behavioral Ecology and Sociobiology.

From: http://phys.org/news284904047.html

Science & Technology

Study says beavers use scent to detect when trespassers could be a threat

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For territorial animals, such as beavers, “owning” a territory ensures access to food, mates and nest sites. Defending that territory can involve fights which cause injury or death. How does an animal decide whether to take on an opponent or not? A new study by Helga Tinnesand and her colleagues from the Telemark University College in Norway has found that the anal gland secretions of beavers contain information about age and social status which helps other beavers gauge their level of response to the perceived threat. The study is published online today in Springer’s journal Behavioral Ecology and Sociobiology. …read more

Source: FULL ARTICLE at Phys.org

Science & Technology

Birds find ways to avoid raising cuckoos' young

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Some species of birds reproduce not by rearing their own young, but by handing that task on to adults of other species. Known as brood parasitism, this habit has been most thoroughly researched in the cuckoo. Previous research has found, however, that the nests of martins and swallows in Europe are rarely parasitized by cuckoos. A new study by Wen Liang from the Hainan Normal University in China and his colleagues suggests that swallows build their nests close to humans to reduce their susceptibility to brood parasitism. The findings are published in Springer’s journal Behavioral Ecology and Sociobiology. …read more

Source: FULL ARTICLE at Phys.org

Science & Technology

Risk management in fish: How cichlids prevent their young from being eaten

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For a variety of reasons, many humans choose to adopt children. More surprisingly, adoption is fairly widespread in the animal kingdom, even though it would seem to counteract the basic premise of Darwin’s theory of evolution, which suggests that animals should raise as many of their own offspring as possible. Understanding the rationale for adoption has challenged theorists for generations. Franziska Schaedelin and colleagues at the University of Veterinary Medicine, Vienna now describe a new approach to the problem. The scientists present findings that suggest parents of fish exchange young with other parents to reduce the chances that their entire brood will be predated. The results are published in the current issue of the journal Behavioral Ecology. …read more
Source: FULL ARTICLE at Phys.org