کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4397082 1305863 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Settlement behaviour and early post-settlement predation of the sea urchin Strongylocentrotus droebachiensis
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Settlement behaviour and early post-settlement predation of the sea urchin Strongylocentrotus droebachiensis
چکیده انگلیسی
We examined behaviour of competent larvae of the green sea urchin Strongylocentrotus droebachiensis provided with pebbles encrusted with coralline red algae, a strong settlement inducer, in laboratory experiments. Larvae settled at greater frequencies on upward-facing coralline surfaces and in small gaps between coralline and glass surfaces than expected by a random distribution of settlement. These patterns may be explained by encounter rate with inductive cues. There was no change in settler distributions within ~ 1 week of settlement, indicating no net movement between adjacent microhabitats. In flow, live and recently killed larvae settled or were passively entrapped at greater frequencies on high- than low-rugosity coralline crusts. Recent settlers (0.5-1 mm test diameter) were consumed by small decapod crustaceans and bulldozed by periwinkles. Juveniles became less vulnerable to predation by hermit crabs with increasing size, and reached a growth refuge at ~ 10 mm test diameter. Our laboratory findings suggest that the cryptic distribution of recent settlers is probably not due to microhabitat selection by settling larvae or early post-settlement migration, at least not in response to physical cues such as light or surface texture. Differential rates predation of young juveniles between exposed and cryptic habitats cannot be ruled out as an important determinant of this pattern.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 365, Issue 1, 20 October 2008, Pages 59-66
نویسندگان
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