. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE AND ACANTHASTER LARVAE 305 Goise Pen i nsu I a \ BA^IETR * Suiain Reefs. Figure 1. in the text. Map showing collection sites and other locations mentioned but the Lord Howe Island population is genetically di- vergent from GBR populations (21), and gene flow into it from the GBR appears to be very limited, indicating a relatively isolated, locally reproducing population. Such evidence of successful reproduction under diverse envi- ronmental temperature regimes and genetic evidence for long-distance larval transpo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE AND ACANTHASTER LARVAE 305 Goise Pen i nsu I a \ BA^IETR * Suiain Reefs. Figure 1. in the text. Map showing collection sites and other locations mentioned but the Lord Howe Island population is genetically di- vergent from GBR populations (21), and gene flow into it from the GBR appears to be very limited, indicating a relatively isolated, locally reproducing population. Such evidence of successful reproduction under diverse envi- ronmental temperature regimes and genetic evidence for long-distance larval transport (14) suggest complexity in Acanthaster's developmental temperature relationships. We have investigated both the developmental temperature tolerances of offspring of geographically widely separated groups of Acanthaster and the effects of experimentally altering temperature exposures of adult, embryonic, and larval starfish. Offspring of animals collected off the Gove Peninsula near Nhulunbuy and at Davies Reef in the GBR (Fig. 1) completed development to bipinnaria larvae equally well at 31°, 27°, and 24°C. At ° and 21°C, Davies Reef embryos produced normal bipinnariae (Table I). At the same temperatures, some Gove embryos hatched, but they ceased development as abnormal early gastrulae. Such geographic differences in developmental temper- ature tolerance may be due to genetic differentiation of separated populations, physiological acclimatization ef- fects reflecting recent parental temperature exposure, or a combination of the two (22-24). We conducted a lab- oratory acclimation experiment to investigate a possible parental acclimatization effect in Acanthaster. A group of adults from Davies Reef was separated into two samples. One sample was held for 18 days at 31 °C and the other at 25 °C for 21 days. We observed differences between the offspring of 25°-acclimated animals and 31 "-acclimated animals in tolerance to lower temperatures (Table I) and in ear
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
