EXPERIMENTAL STUDY ON ON-OFFSHORE MOVEMENT OF SEA URCHIN (STRONGYLOCENTROTUS NUDUS) DUE TO WAVES
نویسندگان
چکیده
منابع مشابه
Experimental evaluation of the anti-attachment effect of microalgal mats on grazing activity of the sea urchin Strongylocentrotus nudus in oscillating flows.
Algal mats can hinder the adhesion of the tube feet of sea urchins. This leads to the hypothesis that the restriction of sea urchin feeding activity by wave action can potentially be enhanced by the presence of algal mats, which will facilitate the survival of kelp recruits at sites with wave action in urchin barrens. To evaluate the potential anti-attachment effect of algal mats on sea urchins...
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approved: Redacted for Privacy __ Dr. Christopher J. Bayne Characteristics of bacterial clearance were investigated in the purple sea urchin, Strongylocentrotus purpuratus (Echinodermata: Echinoidea). Primary clearance kinetics were determined for three bacteria, a marine Gram negative motile rod, a marine Gram positive nonmotile rod, and a fresh water fish pathogen, Aeromonas salmonicida. Vari...
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قاعده مقتضی و مانع در متون فقهی کم و بیش مستند احکام قرار گرفته و مورد مناقشه فقهاء و اصولیین می باشد و مشهور معتقند مقتضی و مانع، قاعده نیست بلکه یکی از مسائل ذیل استصحاب است لذا نگارنده بر آن شد تا پیرامون این قاعده پژوهش جامعی انجام دهد. به عقیده ما مقتضی دارای حیثیت مستقلی است و هر گاه می گوییم مقتضی احراز شد یعنی با ماهیت مستقل خودش محرز گشته و قطعا اقتضاء خود را خواهد داشت مانند نکاح که ...
15 صفحه اولDaily movement of the sea urchin Strongylocentrotus droebachiensis in different subtidal habitats in eastern Canada
We measured the movement and orientation of sea urchins at 2 sites in each of 4 habitats on urchin barrens in the northern Gulf of St. Lawrence, eastern Canada. We tagged the urchins measuring 25 to 70 mm in test diameter using a non-invasive technique involving a knot of fine monofilament thread tied around one spine. Smaller urchins (<25 mm) were tagged by tightening a loop around the test. D...
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ژورنال
عنوان ژورنال: PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN
سال: 1999
ISSN: 0912-7348,1884-8265
DOI: 10.2208/prooe.15.131