One Solution for Two Challenges: The Lizard Microlophus atacamensis Avoids Overheating by Foraging in Intertidal ShoresReportar como inadecuado




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Resumen

In lizards, one of the most important behavioral mechanisms to cope with spatial and temporal variations in thermalresources observed is activity time. The longer a lizard can maintain activity, the more time it has to forage and reach largeradult body size. We studied the behavioral adjustments to different climatic regimens on daily and seasonal scales in threenatural populations of the lizard Microlophus atacamensis along a latitudinal temperature and rainfall gradient. We also usedNiche Mapper to determinate the amount of thermally suitable time for activity for this species. Abundance and dailyactivity patterns varied greatly over the year for the three populations. In summer and spring, the daily activity times weregreater, and were reduced in fall and winter seasons. In summer, when stressful heat loads should prohibit activity over amidday gap, lizards did not show bimodal patterns of activity. Instead, they move to the cooler intertidal habitat.Abundance and thermal quality in the southernmost coolest site was lower, and the potential annual activity time decreaseswith latitude. Contrary to expectations, lizards from this locality showed the largest body sizes possibly due to diet and-ortime to sexual maturation. Our results indicate that the intertidal habitat is a key factor that influences daily and seasonalactivity of M. atacamensis lizards. While this habitat is not climatically optimal for lizards, it allows them to behaviorallyextend their activity window and gain access to food in the intertidal areas.Nota general

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Autor: Sepúlveda, Maritza; - Sabat Kirkwood, Alejandro Pablo; - Porter, Warren P.; - Fariña, José Miguel; -

Fuente: http://repositorio.uchile.cl/



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