Search Results - "HIMMELMAN, John H"

Prey selection and predatory impact of four major sea stars on a soft bottom subtidal community by Gaymer, Carlos F., Dutil, Claudine, Himmelman, John H.

“…We dived at regular intervals (8-, 12- or 24-h) over periods up to 24 days to quantify the feeding activities of identified sea stars along permanent transects…”
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Identification of factors affecting growth and survival of the tropical scallop Euvola (Pecten) ziczac in the Golfo de Cariaco, Venezuela by Lodeiros, César J.M, Himmelman, John H

“…We examined the effect of environmental variables on the growth and survival of the tropical scallop, Euvola ziczac (L.), in suspended culture at Turpialito in…”
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Algal colonization in urchin barrens: defense by association during recruitment of the brown alga Agarum cribrosum by Gagnon, Patrick, Himmelman, John H., Johnson, Ladd E.

“…We investigated the process whereby juveniles of the kelp Agarum cribrosum escape grazing by the green sea urchin, Strongylocentrotus droebachiensis, on urchin…”
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Swimming away or clamming up: the use of phasic and tonic adductor muscles during escape responses varies with shell morphology in scallops by Tremblay, Isabelle, Guderley, Helga E, Himmelman, John H

“…The simple locomotor system of scallops facilitates the study of muscle use during locomotion. We compared five species of scallops with different shell…”
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Biochemical composition and energy allocation in the tropical scallop Lyropecten ( Nodipecten) nodosus during the months leading up to and following the development of gonads by Lodeiros, César J, Rengel, José J, Guderley, Helga E, Nusetti, Osmar, Himmelman, John H

“…We quantified biochemical constituents of the major body components of the scallop Lyropecten nodosus (initially measuring 9.4 mm in shell height) cultured at…”
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Stable Isotopes in Subtidal Food Webs: Have Enriched Carbon Ratios in Benthic Consumers Been Misinterpreted? by Marc-Olivier Nadon, Himmelman, John H.

“…We examined the hypothesis that the δ13C of benthic consumers is depleted in offshore, deeper waters where kelp and benthic microalgae are absent by conducting…”
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Effect of different predators on the escape response of Placopecten magellanicus by Guderley, Helga E, Himmelman, John H, Nadeau, Madeleine, Cortes, Hernan Pérez, Tremblay, Isabelle, Janssoone, Xavier

“…To assess whether giant scallops, Placopecten magellanicus use distinct escape strategies to respond to their seastar and crustacean predators, escape…”
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Biomass–density relationships and self-thinning of blue mussels ( Mytilus spp.) reared on self-regulated longlines by Lachance-Bernard, Myriam, Daigle, Gaétan, Himmelman, John H., Fréchette, Marcel

“…We describe the population dynamics of mussels that are allowed to grow on collectors, and focus on self-thinning which determines the upper limit to yield. We…”
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Responses of the black sea urchin Tetrapygus niger to its sea-star predators Heliaster helianthus and Meyenaster gelatinosus under field conditions by Urriago, Juan Diego, Himmelman, John H., Gaymer, Carlos F.

“…We ran field experiments to examine the responses of the black sea urchin Tetrapygus niger to predatory sea stars. Trials involving simulated attacks (one or…”
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A keystone predatory sea star in the intertidal zone is controlled by a higher-order predatory sea star in the subtidal zone by Gaymer, Carlos F., Himmelman, John H.

“…The impact of keystone predators may be affected by physical conditions and interactions with other predators. We evaluated the impact of the sea…”
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Spawning Events in Small and Large Populations of the Green Sea Urchin Strongylocentrotus droebachiensis as Recorded Using Fertilization Assays by Gaudette, Julien, Wahle, Richard A., Himmelman, John H.

“…During the winter and spring of 2002 and 2003, we used time-integrated fertilization assays to monitor sperm availability in three populations of the green sea…”
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Fatty acids profiles as selecting criteria of microalgal diets used for hatchery-rearing of the tropical scallop Euvola ziczac by Freites, Luis, Lodeiros, César, Guevara, Miguel, Jordan, Noris, Maeda-Martínez, Alfonso N, Himmelman, John H

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Aggregation of whelks, Buccinum undatum, near feeding predators: the role of reproductive requirements by Rochette, Rémy, Tétreault, Françoise, Himmelman, John H.

“…In the Mingan Islands, northern Gulf of St Lawrence (eastern Canada), the whelk Buccinum undatum displays a strong escape response to its predator, the…”
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Multiple factors explain the covering behaviour in the green sea urchin, Strongylocentrotus droebachiensis by Dumont, Clément P., Drolet, David, Deschênes, Isabelle, Himmelman, John H.

“…Although numerous species of sea urchins often cover themselves with small rocks, shells and algal fragments, the function of this covering behaviour is poorly…”
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Spawning synchrony and aggregative behaviour of cold-water echinoderms during multi-species mass spawnings by Himmelman, John H., Dumont, Clément P., Gaymer, Carlos F., Vallières, Catherine, Drolet, David

“…Although many marine invertebrates reproduce by releasing gametes into the water, major spawning events have rarely been observed for cold-water invertebrates…”
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Responses of the saucer scallop Amusium balloti to potential predators by Himmelman, John H., Guderley, Helga E., Duncan, Peter F.

“…A high natural mortality rate has been documented for the saucer scallop Amusium balloti, an Australian scallop found on sediment bottoms at 30–60 m deep, but…”
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Sea urchin Tetrapygus niger distribution on elevated surfaces represents a strategy for avoiding predatory sea stars by Urriago, JD, Himmelman, JH, Gaymer, CF

“…We ran field experiments to examine whether the micro-distribution of the sea urchin Tetrapygus niger on elevated surfaces represents a strategy for limiting…”
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Random movement pattern of the sea urchin Strongylocentrotus droebachiensis by Dumont, Clément P., Himmelman, John H., Robinson, Shawn M.C.

“…We describe the fine-scale movement of the sea urchin Strongylocentrotus droebachiensis based on analyses of video recordings of undisturbed individuals in the…”
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Contribution of food availability to the more rapid growth of the scallop, Euvola ziczac (Pteroida, Pectinidae) in bottom than in suspended culture by Hunauld, Patrick, Vélez, Anibal, Jordan, Noris, Himmelman, John H, Morales, Francisco, Freites, Luis, Lodeiros, César J

“…We conducted a 5-month experiment at Turpialito in the Golfo de Cariaco, Venezuela, to examine whether the previously reported more rapid growth of scallop…”
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Daily movement of the sea urchin Strongylocentrotus droebachiensis in different subtidal habitats in eastern Canada by DUMONT, Clément P, HIMMELMAN, John H, RUSSELL, Michael P

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