Climate change and habits pose a greater risk to migratory animals and birds, because they die young, and therefore are less adaptive, as experts from the University of Exeter studied nearly 1,300 species of mammals and birds, and found that those who migrate usually grow faster and have offspring. The earlier and they die younger.
According to the British newspaper “Daily Mail”, the results can help explain why many migratory species are declining, because they are less able, for example, to delay poor breeding conditions.
The study could also help predict how migratory species will respond to environmental shifts in the future, as the team also observed that migratory animals that swim or walk are usually larger than their non-migratory counterparts, while migratory birds are usually smaller.
“Many species migrate over long distances, and this requires large amounts of energy,” said researcher and biologist Andrea Soriano Redondo from the University of Exeter.
The researcher added, “This energy cannot be used for other purposes such as self-maintenance or reproduction, so we expect the animals to control the amount of energy they use for these things.”
Dr. Soriano Redondo and her colleagues examined the so-called “rhythm of life” of 1,296 species, looking at measures such as longevity, ages at which females reach sexual maturity and reproductive frequency.
“We have always believed that migration is a risky behavior,” said researcher and animal ecologist Stuart Bearhope of the University of Exeter.
“Often animals take a chance when they migrate, hoping to find suitable conditions at their destination,” he added.
The paper’s researcher and environmentalist Dave Hodgson added: “We believe that immigrants who walk or swim are generally larger because only large animals can store enough energy and use it efficiently enough to carry out long migrations, either land or sea.” Among flying types, because a large body mass makes flying more energy efficient. “
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