In one of the few studies on the effects of UV on marine invertebrates other than corals, Hovel and Morgan (1999) examined the susceptibility of estuarine crab larvae to UV radiation. UV and photosynthetically active radiation were all rapidly attenuated in the turbid saltmarsh, but UVBR still decreased larval survival of all three species. However, because larvae in this marsh were released during nocturnal ebb tides, most newly hatched larvae were flushed from the marsh before daybreak and therefore avoided extensive UVB exposure. Just how widespread this larval susceptibility is to UVB will have to await further studies.



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