### Relative size underlies alternative morph development in a salamander

Michael Moore, Joseph Pechmann & Howard Whiteman
Size thresholds commonly underlie the induction of alternative morphological states. However, the respective importance of absolute and relative size to such thresholds remains uncertain. If absolute size governs expression, morph frequency should differ among environments that influence absolute sizes (e.g. resources, competition), and individuals of the same morph should have similar average sizes across environments. If relative size determines expression, the frequency of each morph may not differ among environments, but morphs within each environment...

### Thermal adaptations to extreme freeze-thaw cycles in the high tropical Andes

Kelsey Reider
Temperature plays a key role in the biology of ectotherms, including anurans, which are found at higher elevations in the tropics than anywhere in the temperate zone. High-elevation tropical environments are characterized by extreme daily thermal fluctuation including high daily maxima and nightly freezing. Our study investigated the contrasting operative temperatures of the anurans Telmatobius marmoratus and Pleurodema marmoratum in different environmental contexts at the same elevation and biome above 5200 meters. Telmatobius marmoratus avoids...

• 2020
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• Dataset
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#### Affiliations

• Murray State University
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