Abstract
Experiments showed that brood production of livebearers Gambusia spp. was affected by light intensity. Females were exposed to 108, 216, 324, and 432 lux of incandescent light. Natural light varies with turbidity and aquatic plant cover, but clear surface waters exceed 432 lux. Western mosquitofish Gambusia affinis (P = 0.025), largespring gambusia G. geiseri (P < 0.01), and Clear Creek gambusia G. heterochir (P < 0.01) had significantly fewer broods at low lux, but Pecos gambusia G. nobilis (P < 0.01) had fewer broods at high lux. This finding was not due to differences in feeding, breeding delays, or sexual activity, because the females store sperm and were isolated from the males. Pecos gambusia from East Sandia Spring had more broods at highest light, and largespring gambusia from the same location had more broods at lower light.
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