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Showing 1 to 20 of 55 for “"Biology, Marine"”.
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ΤΑ ΣΙΦΩΝΟΦΟΡΑ ΥΔΡΟΖΩΑ ΤΩΝ ΕΛΛΗΝΙΚΩΝ ΘΑΛΑΣΣΩΝ (ΜΟΡΦΟΤΑΞΟΝΟΜΙΑ, ΟΙΚΟΓΕΩΓΡΑΦΙΑ, ΙΣΤΟΛΟΓΙΑ)
ΘΕΜΑ ΕΙΝΑΙ Η ΜΕΛΕΤΗ ΤΩΝ ΣΙΦΩΝΟΦΟΡΩΝ ΤΩΝ ΕΛΛΗΝΙΚΩΝ ΘΑΛΑΣΣΩΝ, ΓΙΑ ΧΡΟΝΙΚΗ ΠΕΡΙΟΔΟ 10 ΕΤΩΝ. ΕΙΝΑΙ ΣΗΜΑΝΤΙΚΗ ΓΙΑΤΙ ΕΓΙΝΕ ΣΕ ΕΥΡΥ ΓΕΩΓΡΑΦΙΚΟ ΧΩΡΟ, ΠΟΥ ΚΑΛΥΠΤΕΙ ΣΧΕΔΟΝ ΟΛΑ ΤΑ ΕΛΛΗΝΙΚΑ ΠΕΛΑΓΗ (Β. ΚΑΙ Ν. ΑΙΓΑΙΟ) ΚΑΙ ΤΟΥΣ ΠΕΡΙΣΣΟΤΕΡΟΥΣ ΑΠΟ ΤΟΥΣ ΚΥΡΙΟΤΕΡΟΥΣ ΚΟΛΠΟΥΣ (Β. ΕΥΒΟΙΚΟΣ, ΣΑΡΩΝΙΚΟΣ, ΠΑΓΑΣΗΤΙΚΟΣ). …
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The functional morphology and ecology of Chone mollis
… member of the bay community. As with most marine communities, very little work has been done with individual species of the community. The present study of C. mollis is a contribution towards an understanding of the community as an ecological unit.</p><p> This study investigates the …
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Oxyconformity in Burrow-dwelling Crustaceans : Aerobic Metabolism of HEMISQUILLA ENSIGERA CALIFORNIENSIS
<p><em>Hemisquilla ensigera califomiensis</em> is an active burrow-dwelling stomatopod crustacean common off the coast of Southern California (Basch and Engle, 1989). In this experiment I measured the typical burrow oxygen level, time taken to deplete the oxygen in an inhabited, capped burrow, and …
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The Growth and Bioenergetics of <i>Callinectes sapidus</i> Larvae and the Effects of Diet Quality on Larval Physiology
<p>Food quality, especially ω3 polyunsaturated fatty acids (PUFA), can affect the physiology and metabolic efficiency of larvae of the blue crab, <em>Callinectes sapidus</em>. These affects may correlate with success in development and juvenile recruitment.</p> <p>Larvae were exposed to two diets …
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Seasonal and Mesoscale Variability in the Distribution of Antarctic Krill, <i>Euphausia superba</i>, West of the Antarctic Peninsula
<p>Observations collected between November 1991 and September 1993 during four multidisciplinary cruises were analyzed to provide a description of seasonal and mesoscale variability in the distribution and abundance of Antarctic krill, Euphausia superba, within continental shelf waters west of the …
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Chemoreceptors Regulate Discharge of Microbasic p-mastigophores in the Sea Anemone, AIPTASIA PALLIDA
<p>Recently, using cnida-mediated measurements of adhesive force, Thorington and Hessinger (1984, 1988a, b) identified two different chemoreceptors involved in triggering cnida discharge on the tentacles of the sea anemone, Aiptasia pallida. These two classes of receptors were shown to interact …
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ΒΙΟΝΟΜΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΜΑΚΡΟΠΑΝΙΔΑΣ ΤΟΥ ΚΙΝΗΤΟΥ ΥΠΟΣΤΡΩΜΑΤΟΣ ΤΗΣ ΜΕΣΟΠΑΡΑΛΙΑΚΗΣ ΖΩΝΗΣ ΣΤΟ ΣΤΡΥΜΟΝΙΚΟ ΚΑΙ ΘΕΡΜΑΙΚΟ ΚΟΛΠΟ
THE QUALITATIVE AND QUANTITATIVE COMPOSITION OF THE MEDIOLITTORAL BENTHIC COMMUNITIES ON THE SOFT SUBSTRATE IN STRYMONIKOS GULF AND IN THE GULF OF THESSALONIKI ARE ANALYSED. THE COMMUNITIES STUDIED ARE THE FOLLOWING: A) THE COMMUNITY OF THE MEDIOLITTORAL GRAVELS, B) THE COMMUNITY OF THE …
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Ventilation Behavior of the Mantis Shrimp, HEMISQUILLA ENSIGERA CALIFORNIENSIS IN HYPOXIC BURROWS
… is an environmentally challenged marine species due to the fact it inhabits burrows located beneath the surface of the sediment where oxygen pressure is low and easily depleted. This experiment revealed that burrow oxygen pressure (pO<sub>2</sub>) is frequently hypoxic and can …
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Spatial and Seasonal Patterns of Above- and Belowground Vegetation Biomass and Potential Drivers in the Pascagoula River Delta, MS
<p>Coastal wetlands provide a valuable wealth of services to the greater coastal ecosystem and human communities. However, threats such as sea level rise and conservation projects, such as freshwater diversions, have the potential to alter coastal wetlands in different ways. In this thesis, I …
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A physiological comparison of isopods in the transition from a marine to a terrestrial habitat : with notes on their morphology and behavior
… life. Cirolana harfordi was used as a completely marine form. Idothea (Pentidotea) wosnesenskii represents a step toward land life as it inhabits an area uncovered by most low tides. Ligia occidentalis is found in the splash zone, receiving spray from the action of the surf. This illustrates …
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Regional Extinction Risk and Conservation Priorities for Persian Gulf Marine Bony Fishes
… the regional extinction risk for all known marine bony fishes of the Persian Gulf. About 8.3% of the 471 marine bony fishes assessed are at elevated risk of regional extinction. The distribution of threatened species is primarily linked to coastal areas with high human activity and …
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Feeding Selectivity and Habitat Usage of <i>Esox americanus</i>
<p>Patterns of piscine prey selection and habitat usage of <em>Esox americanus</em> were assessed through a series of field and experimental studies. Although few detailed studies exist on the foraging behavior and habitat usage of <em>E. americanus</em>, throughout its range it may be an important …
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Reproductive Life History of <i>Fundulus jenkensi</i> and Comparative Development of Five Sympatric Fundulid Species
<p><em>Fundulus</em> <em>jenkinsi</em> is recognized federally and within the state of Mississippi as a Species of Concern. Little is known about the life history of this coastal killifish, but a detailed reproductive histology study of <em>F. jenkinsi</em> and a diagnostic key of the early life …
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Spatial Distribution and Stock-Recruitment Analysis of the Atlantic Surfclam, <i>Spisula solidissima</i>, in the Mid-Atlantic Bight and on Georges Bank
<p>Atlantic surfclams, <em>Spisula solidissima</em>, are long-lived bivalve molluscs with dispersive larval stages. Surfclam patchiness throughout the U.S. Exclusive Economic Zone (EEZ) has declined from the 1980’s to the present in all assessed regions (Delmarva, New Jersey, Long Island, Southern …
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The Ontogeny of Whistle Production in Infant Atlantic Bottlenose Dolphins (<i>Tursiops truncatus</i>) During the First Thirty Days of Life
<p>The manner in which dolphin calves acquire their whistle repertoire is largely unknown. This paper focuses on whistle development in four bottlenose dolphin calves during the first thirty days of life in order to increase our understanding of the early emergence of whistles and whistle-like …
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Global Conservation Status of Croaker and Drum (Family: Sciaenidae) and Role of the Maw Trade
… of extinction risk is critical to conserving marine biodiversity. Although marine bony fishes are some of the most diverse and abundant vertebrates in the world, overexploitation is the major threat to these taxa. Species in the family Sciaenidae are important marine resources in many parts of …
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LARVAL FISH EXPORT IN RESPONSE TO VARYING COMPENSATING GATE DISCHARGE AT THE SAULT RAPIDS, ST. MARYS RIVER
<p>The St. Marys River (SMR) forms the border between Michigan, USA and Ontario, Canada connecting lakes Superior and Huron. Discharge is controlled by a compensating gate system upstream of the SMR rapids. Because spring and summer discharge fluctuates widely, resource managers required …
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Responses to salinity of color polymorphs in two populations of the sea star, Pisaster achraceus
<p><em>Pisaster ochraceus</em> was analyzed to determine if varying salinities, animal color, or location affect the physiology of these sea stars. The three responses analyzed were aerobic respiration, ammonia excretion, and self-righting. The tested variables included two different color morphs …
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Evaluating in situ Grazing Patterns of Lytechinus variegatus and their Effects on Seagrass Beds of Thalassia testudinum
<p>The sea urchin<em> Lytechinus variegatus </em>is a known grazer of the seagrass <em>Thalassia testudinum</em>, and has been known to denude vast stands of seagrass beds at high densities. Outside of these denudation events, the effects of sea urchins on seagrass are poorly understood. This study …
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ΒΙΟΝΟΜΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΘΑΛΑΣΣΙΩΝ ΑΝΕΜΩΝΩΝ (ACTINIARIA, ANTHOZOA) ΤΟΥ ΘΕΡΜΑΙΚΟΥ ΚΟΛΠΟΥ
THE RESEARCH CARRIED OUT IN THERMAIKOS GULF REVEALED THE PRESENCE OF 15 SPECIESOF SEA ANEMONES. NINE OF THE FIFTEEN SPECIES FOUND, ARE REPORTED FOR THE FIRSTTIME FROM THE EASTERN MEDITERRANEAN AND ONE FROM THE AEGEAN SEA. ACCORDING TO THE SELECTIVE PREFERENCE SHOWED BY THE VARIOUS ANEMONE SPECIES …
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