February 5-11, 2019 (Week 6 of 52): Cold-Blooded Critters Just Chill for Winter

Buffalo-Niagara Nature Almanac

More than 150 cold-blooded vertebrates are native to the Buffalo-Niagara Region including fish, amphibians, and reptiles. These poikilotherms cannot regulate their body temperatures metabolically like mammals and birds. Instead, their temperatures are controlled by the surrounding environment and therefore drop as air and water temperatures drop in autumn. Most respond to the advancing cold by retreating to protected areas, where their body temperatures can stay above freezing, and then going dormant for the winter. Unlike mammals, this state of dormancy is triggered by cold, not hormones. Most herps (amphibians and reptiles) enter dormancy by late October or early November in our Region, while most fish do so a little later in autumn. However, it is noteworthy that some aquatic species stay active in the Great Lakes, Niagara River, tributary streams, ponds, and deep wetlands where water temperatures remain just above freezing for most of the winter.

Winter-active fish include yellow…

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