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Population Ecology of a Highly Productive Aquatic Salamander (Siren intermedia)

Frederick R. Gehlbach and Stephen E. Kennedy
The Southwestern Naturalist
Vol. 23, No. 3 (Aug. 10, 1978), pp. 423-429
DOI: 10.2307/3670250
Stable URL: http://www.jstor.org/stable/3670250
Page Count: 7
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Population Ecology of a Highly Productive Aquatic Salamander (Siren intermedia)
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Abstract

Siren intermedia nettingi Goin is unique among salamanders in combining high density $(0.9-1.3\ \text{sirens}/\text{m}^{2})$ through high net productivity $(29\text{g}/\text{m}^{2}/\text{year})$ with large size (x̄ 42 g) to attain a standing crop biomass of $38-57\ \text{g}/\text{m}^{2}$. Characteristics that contribute to the high productivity include great fecundity (151-226 eggs/female/year) and rapid growth (0.42%/day) to sexual maturity in one year. The standing crop of S. intermedia alone may be 1.1-1.3 times that predicted for all seven species of insectivorous fishes in the same beaver pond community in Texas. Siren intermedia is unusual among vertebrates in being both an early colonizer and dominant species in at least two different successional stages of a single community.

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