Abstract
Branchinecta packardi Pearse, 1912 grows rapidly and begins reproducing at the age of seven days. The first clutch contains only one or two eggs. Females deposit a clutch each day. Reproductive populations occur during all seasons in Central Texas. Streptocephalus texanus Packard, 1871 has a slower growth rate and does not begin reproduction until 11 days of age. Females deposit a clutch every second day. The species is a warm season form in Central Texas. These life history differences most likely explain why B. packardi inhabits the shallow, exposed weather-pit pools atop Enchanted Rock and S. texanus does not.
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Belk, D. Why only one of two common Central Texas Anostraca atop Enchanted Rock?. Hydrobiologia 212, 83–86 (1991). https://doi.org/10.1007/BF00025990
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DOI: https://doi.org/10.1007/BF00025990