Ultraviolet irradiation increases size of the first clutch but decreases longevity in a marine copepod.

Autor: Heine KB; Department of Biological Sciences Auburn University Auburn AL USA., Powers MJ; Department of Biological Sciences Auburn University Auburn AL USA., Kallenberg C; Department of Biological Sciences Auburn University Auburn AL USA., Tucker VL; Department of Biological Sciences Auburn University Auburn AL USA., Hood WR; Department of Biological Sciences Auburn University Auburn AL USA.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2019 Aug 01; Vol. 9 (17), pp. 9759-9767. Date of Electronic Publication: 2019 Aug 01 (Print Publication: 2019).
DOI: 10.1002/ece3.5510
Abstrakt: An important component of life history theory is understanding how natural variation arises in populations. Both endogenous and exogenous factors contribute to organism survival and reproduction, and therefore, it is important to understand how such factors are both beneficial and detrimental to population dynamics. One ecologically relevant factor that influences the life history of aquatic organisms is ultraviolet (UV) radiation. While the majority of research has focused on the potentially detrimental effects that UV radiation has on aquatic organisms, few studies have evaluated hormetic responses stimulated by radiation under select conditions. The goal of this study was to evaluate the impact of UV-A/B irradiation on life history characteristics in Tigriopus californicus copepods. After exposing copepods to UV-A/B irradiation (control, 1-, and 3-hr UV treatments at 0.5 W/m 2 ), we measured the impact of exposure on fecundity, reproductive effort, and longevity. We found that UV irradiation increased the size of the first clutch among all reproducing females in both the 1- and 3-hr experimental groups and decreased longevity among all females that mated in the 1-hr treatment. UV irradiation had no effect on the number of clutches females produced. These findings indicate a potential benefit of UV irradiation on reproductive performance early in life, although the same exposure came at a cost to longevity.
Competing Interests: None declared.
Databáze: MEDLINE
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