Smith Geoffrey R, Waters Mary Ann, Rettig Jessica E
Department of Biology, William Jewell College, 500 College Hill, Liberty, MO 64068, U.S.A.
Conserv Biol. 2000 Dec 18;14(6):1903-1907. doi: 10.1111/j.1523-1739.2000.99364.x.
In organisms with complex life cycles, understanding the effects of environmental change requires investigating the possibility that the effect of such change on one stage will have consequences for other stages. We investigated the effects of embryonic exposure to UV-B radiation on embryo and tadpole development of the plains leopard frog ( Rana blairi). Embryos were exposed to sunlight filtered to provide two levels of UV-B exposure (e.g., at 310 nm: high exposure is approximately 84% transmittance and low exposure is approximately 58% transmittance). Hatching success of embryos exposed to different UV-B levels did not differ. Tadpoles resulting from exposed embryos were raised at three densities. Growth and development were slower in tadpoles exposed to higher UV-B levels as embryos. Density negatively affected growth and development. Survivorship did not differ among UV-B or density treatments. Our results suggest that even if lethal effects are not exhibited at one stage, sublethal effects may manifest themselves at other stages, possibly affecting the long-term success of exposed individuals and populations.
在具有复杂生命周期的生物体中，要了解环境变化的影响，就需要研究这种变化对一个阶段的影响是否会对其他阶段产生后果。我们研究了胚胎期暴露于UV-B辐射对平原豹蛙（Rana blairi）胚胎和蝌蚪发育的影响。将胚胎暴露于经过过滤的阳光下，以提供两种UV-B暴露水平（例如，在310纳米处：高暴露约为84%的透光率，低暴露约为58%的透光率）。暴露于不同UV-B水平的胚胎的孵化成功率没有差异。由暴露胚胎产生的蝌蚪以三种密度饲养。作为胚胎时暴露于较高UV-B水平的蝌蚪的生长和发育较慢。密度对生长和发育有负面影响。UV-B或密度处理之间的存活率没有差异。我们的结果表明，即使在一个阶段没有表现出致死效应，亚致死效应也可能在其他阶段显现出来，这可能会影响受暴露个体和种群的长期生存。
