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- W1972588833 abstract "Abstract In ectothermic organisms, declining season length and lower temperature towards higher latitudes often select for latitudinal variation in growth and development. However, the energetic mechanisms underlying this adaptive variation are largely unknown. We investigated growth, food intake and growth efficiency of Rana temporaria tadpoles from eight populations along a 1500 km latitudinal gradient across Sweden. To gain an insight into the mechanisms of adaptation at organ level, we also examined variation in tadpole gut length. The tadpoles were raised at two temperatures (16 and 20 °C) in a laboratory common garden experiment. We found increased growth rate towards higher latitudes, regardless of temperature treatment. This increase in growth was not because of a higher food intake rate, but populations from higher latitudes had higher growth efficiency, i.e. they were more efficient at converting ingested food into body mass. Low temperature reduced growth efficiency most strongly in southern populations. Relative gut length increased with latitude, and tadpoles at low temperature tended to have longer guts. However, variation in gut length was not the sole adaptive explanation for increased growth efficiency as latitude and body length still explained significant amounts of variation in growth efficiency. Hence, additional energetic adaptations are probably involved in growth efficiency variation along the latitudinal gradient." @default.
- W1972588833 created "2016-06-24" @default.
- W1972588833 creator A5069747396 @default.
- W1972588833 creator A5071766442 @default.
- W1972588833 date "2005-07-01" @default.
- W1972588833 modified "2023-10-16" @default.
- W1972588833 title "Proximate causes of adaptive growth rates: growth efficiency variation among latitudinal populations of Rana temporaria" @default.
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- W1972588833 doi "https://doi.org/10.1111/j.1420-9101.2004.00875.x" @default.
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