8.5 Consider a gene for temperature tolerance in the California Red-Legged Frog.

Question

8.5 Consider a gene for temperature tolerance in the California Red-Legged Frog. This gene has three alleles, and the alleles are present in the same proportions in two frog populations. The proportions for the three alleles are: 0.85 Mod, 0.12 Low, and 0.03 High. The two frog populations are a Tiburon population of 100 frogs, and a Novato population of 100,000 frogs. The Novato population has more frogs, but it is identical to the Tiburon population in every other respect. Describe how the genetic diversity of these two frog populations will change through time. Illustrate your answer with a figure

Explanation / Answer

answer

The red-legged frog of California occupies a quite different habitat, combining specific water components (aquatic) and highland (terrestrial). California red-legged frog habitat includes almost any area within 1-2 miles of a breeding site that remains moist and cool during the summer; this includes non-breeding aquatic habitat in puddles of slow-moving streams, perennial or ephemeral ponds and warm habitat such as rocks, burrows of small mammals, trunks, densely vegetated areas and even artificial Breeding sites are usually found in deep, quiet or slow-moving waters and can have a wide variety of edges and amounts of emerging cover. California red-legged frogs can reproduce in sites with riparian or emergent shrubby vegetation, such as totorales, tulles or hanging willows, or they can proliferate in ponds devoid of emergent vegetation and any apparent vegetation cover California red-legged frogs still abound locally in parts of the San Francisco Bay area and the central coast.

Within the remaining distribution of the species, only isolated populations have been documented in Sierra Nevada, the north coast and the transverse ranges of the north.

Several species feed on the red-legged frogs of California, including raccoons, league snakes, bass, mosquito fish, herons, herons, cats, foxes, coyotes and, most importantly, the introduced American bullfrog. The safest aggregations of California red-legged frogs are found in aquatic sites that support substantial riparian and aquatic vegetation for their coverage and lack exotic predators.

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