Wild insects 'get old' before they die

January 14, 2019, University of Exeter

Short-lived wild insects "get old—losing some of their physical abilities—before they die, new research shows.

Few studies have examined whether insects such as field crickets—whose adult life lasts a few weeks—experience "ageing" in the sense of physical decline in nature.

Insects are used to study ageing in laboratories, but it wasn't clear whether they only reach "old age" because they are protected from a harsh natural environment.

"Just like humans, crickets get old," said lead author Dr. Rolando Rodríguez-Muñoz, of the Centre for Ecology and Conservation on the University of Exeter's Penryn Campus in Cornwall.

"Though we didn't find evidence of 'live fast, die young' in this species, those that put more energy into reproduction early in life showed some signs of faster decline as they aged."

University of Exeter researchers used a network of more than 130 video cameras to study every hour of the lives of a population of wild crickets in a Spanish meadow.

They monitored reproductive effort, ageing and survival over a ten-year period.

They found no evidence of a "trade-off" between reproductive effort in early life (measured by emergence date, calling, searching and winning fights) and survival.

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The African Fish That Lives Fast and Dies Young

Sep. 4, 2013 — African annual fish take the adage 'live fast, die young' to a whole new level with the discovery that their short lifespan is accompanied by the most rapid sexual maturation of any vertebrate species. The find, reported in the open access journal EvoDevo as part of a series on extreme environments, adds to our knowledge of extremophile lifestyles.

Extreme environments can give rise to extreme adaptations. The tiny annual fish of Africa live in temporary puddles created by seasonal rainfall, and so must grow and reproduce quickly in order to lay their hardy eggs before the waters dry up.

African annual fish can grow up to 23% of their body length in a day, report Martin Reichard and colleagues, who studied wild-caught fish in captivity. One species, Nothobranchius kadleci started reproducing at 17 days old, at a size of just 31 mm, with a related species, N. furzeri maturing only one day later. The fish then produced eggs that developed to the hatching stage in as few as 15 days, making the time from one generation to the next as little as month -- the most rapid sexual maturation time and minimum generation time of any known vertebrate species.

When the pools dry up, dormant embryos can survive in the dried mud for months, until the next rains come and the life cycle begins again. In the lab, half of embryos skipped dormancy when incubated on a peat substrate in a Petri dish. In the wild these individuals would populate secondary pools produced within a single rainy season after the primary pool desiccated. The findings suggest that rapid growth and maturation do not compromise subsequent fecundity.

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