Synopsis
Like other congeneric damselfishes, the herbivorous Stegastes altus defends individual feeding territories from heterospecific food competitors, regardless of sex. Females spawned demersal eggs for 31.4 min (n = 25) at the nest in territories of males 0–75 m away from theirs. Throughout the spawning season (June to September), spawning occurred only at dawn, mainly just after sunrise. Daily activity of the fish community showed that potential diurnal food competitors were few or inactive only at dawn and dusk. The frequency of intrusions into the female's territory by heterospecific competitors were as low when she left her territory to spawn at dawn, as they were in the daytime when she defended it. Removal of the female in the daytime resulted in a significant increase in intrusion frequency. An ‘anti-competitor hypothesis’, whereby dawn spawning ensures the food resource in the female's territory seems to explain not only the spawning periodicity in S. altus but also the timing of spawning of other permanently territorial damselfishes.
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Contribution from the Laboratory of Animal Ecology, Kyoto University, No. 492.
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Kohda, M. Diurnal periodicity of spawning activity of permanently territorial damselfishes (Teleostei: Pomacentridae). Environ Biol Fish 21, 91–100 (1988). https://doi.org/10.1007/BF00004845
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DOI: https://doi.org/10.1007/BF00004845