Tadpole Adaptations to Increasing Temperatures in Urban Environments

By: Mallory Crispens, Sarah Faley, and Lilly Leach (Stonehill College, Bio323: Evolution Spring 2024)

Overview

One of the most beneficial characteristics for survival in the natural world is the ability to adapt to changing environments. In the face of climate change and increasing urbanization of rural areas, it has become even more important for wildlife to be able to adapt and endure increasing temperatures. Urban heat islands are a significant consequence of urbanization, occurring when cities replace natural land cover with dense concentrations of pavement, buildings, and other surfaces that absorb and retain heat. These heat islands create a brand-new environment for wildlife, particularly for pond-dwelling animals such as tadpoles whose aquatic environment is sensitive to change. While most organisms living in urban environments have elevated tolerance to heat, the thermal adaptations of aquatic organisms are relatively unknown. In the article, “Tadpoles Develop Elevated Heat Tolerances in Urban Heat Islands Regardless of Sex”, Dr. Bokony analyzes tolerance to increasing temperature, as a result of urbanization, in tadpoles.

A short podcast summarizing the article. Soundtrack image from https://scx2.b-cdn.net/gfx/news/2017/tadpole.jpg
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Why do birds get divorced?

Divorce in Savannah Sparrows of Kent Island

by: Michael Calcagno, Meghan Ghazal, Lizzie Poyant & Zarir Sidhwa (Stonehill College Evolution Fall 2017)

In Savannah sparrows (Passerculus sandwichensis) that reside on Kent Island, New Brunswick, Canada an understanding of divorce rates within the species was analyzed to determine the molecular basis of the phenotypic trait. As well as, to determine if divorce is an adaptive strategy for greater fitness for females. In this species, approximately 47% of pairs in which both partners survived to the following breeding season ended in divorce. Neither the lifetime number of divorces nor whether an individual had ever divorced affected the fitness of either sex, thus suggesting little to no sexual selection for the trait. Divorce in the Savannah sparrows appeared to be an inheritable behavior in which expression depending primarily upon an individual’s age, mating status, sex, and size.

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