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Showing 1 to 20 of 89 for “"Copepod"”.
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Interactions between calanoid copepod hosts and their associated microbiota
Copepods are highly abundant environmental reservoirs of many bacterial pathogens. This thesis investigates whether copepod physiology influences the abundance and community structure of its microbiome. To this end, we first examined the ability of the oceanic copepod Calanus finmarchicus to …
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Interactions between calanoid copepod hosts and their associated microbiota
Zooplankton, such as copepods, are highly abundant environmental reservoirs of many bacterial pathogens. Although copepods are known to support diverse and productive bacterial communities, little is understood about whether copepods are affected by bacterial attachment and whether they can …
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Physical controls on copepod aggregations in the Gulf of Maine
… the distribution of dense aggregations of copepods. These aggregations are an important part of the marine ecosystem, especially for endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this thesis looks at …
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Physical controls on copepod aggregations in the Gulf of Maine
… the distribution of dense aggregations of copepods. These aggregations are an important part of the marine ecosystem, especially for endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this thesis looks at …
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RESPONSES OF THE COPEPOD ACARTIA TONSA TO HYPOXIA IN CHESAPEAKE BAY
… studies have been done investigating how the copepod Acartia tonsa responds to hypoxia, few studies have focused on a comprehensive understanding of how its behavior and fitness are affected by low oxygen. The abundance, distribution, fitness and diel vertical migration patterns of A. tonsa …
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The Effects of Kepone on the Estuarine Copepod <i>Acartia tonsa</i>
… toxic and sublethal levels of kepone for the copepod <em>Acartia tonsa</em>, and to investigate what effects those levels may have on filtration rates.</p> <p>Kepone was determined to be acutely toxic to <em>A. tonsa</em>, with a 96 hour LC50 of 4.96 ug/1. <em>Dunaliella tertiolecta</em> was …
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A model of copepod population dynamics in the southern Benguela upwelling region
… variability in the biomass of a dominant copepod Calanoides carinatus (Copepoda: Calanoida) along the West Coast region of South Africa. C. carinatus is extensively preyed upon by the commercially important anchovy Engraulis capensis and variability in zooplankton production may serve as …
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Factors influencing the induction of diapausing egg production in the calanoid copepod Diaptomus leptopus
… diapausing egg production in a single species of copepod found in habitats that differ in permanence. Field studies of four populations of Diaptomus leptopus carried out from 1995 to 1997 reveal quite different seasonal patterns in the production of subitaneous and diapausing eggs; these distinct …
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Physical control of the distributions of a key Arctic copepod in the northeast Chukchi Sea
The copepod Calanus glacialis is one of the most important zooplankton taxa in the Arctic shelf seas where it serves as a key grazer, predator, and food source. Its summer distribution and abundance have direct effects on much of the food web, from blooming phytoplankton to migrating bowhead …
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A comparative study of cannibalism in six populations of the calanoid copepod, Diaptomus leptopus (Forbes)
… which have overlapping and discrete life stages. Copepods are a typical example of the type of species which exhibit adult cannibalism of juvenile life stages. The scale of observation typically used in cannibalism studies may allow misinterpretation of the results. I used populations of Diaptomus …
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Temporal and spatial variability in a copepod community off St Helena Bay in 2000/1
The driving forces behind changes in copepod community structure in the Benguela upwelling region are examined. For this study, monthly changes in copepod size structure and species composition were examined at St Helena Bay in 2000/1 in relation to upwelling, phytoplankton and fish. The copepod …
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Physical control of the distributions of a key Arctic copepod in the Northeast Chukchi Sea
The copepod Calanus glacialis is one of the most important zooplankton taxa in the Arctic shelf seas where it serves as a key grazer, predator, and food source. Its summer distribution and abundance has direct effects on much of the food web, from blooming phytoplankton to migrating bowhead whales. …
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Lipoxygenase Activity in Diatoms : A New Tool to Study the Antiproliferative Effects of Diatoms on Copepod Reproduction
… deleterious effects of maternal diatom diets on copepod embryonic development have been puzzling the scientific community for the past 15 years. Since the discovery of the first anti-mitotic compounds, polyunsaturated aldehydes deriving from fatty acid oxidation,our knowledge of the oxylipin …
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Nutritional Relationship between the Copepod Parasite CHAROPINUS DENTATUS (Wilson) (Lernaeopodidae) and the Skate Host, RAJA BINOCULATA Girard
<p>Of 1,798 parasitic copepods, Charopinus dentatus (Wilson), collected from the skate host, Raja, binoculata Girard, 1,615 (89.87.) were obtained from the mucosa lining the mouth and pharynx. None were collected from the gill filaments. Host tissue damage was not seen grossly or microscopically …
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Copepod contribution in the pelagic food web in the oligotrophic waters of Eastern Mediterrenean Sea: Implications for MSFD Implementation.
Η Μεσόγειος Θάλασσα είναι γνωστή ως ένα από τα πιο ολιγοτροφικά υδάτινα σώματα στον πλανήτη, που χαρακτηρίζεται από εξαιρετικά χαμηλές συγκεντρώσεις θρεπτικών συστατικών, ιδιαίτερα στο ανατολικό της άκρο. Το ζωοπλαγκτόν, ως βασική ομάδα μεταξύ των βιολογικών συστατικών της Οδηγίας-Πλαισίου για τη …
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Variability of copepod abundance and growth in the southern Benguela upwelling system and implications for the spawning of the Cape anchovy
… strategy requires continual ingestion of copepods, which dominate the diet of anchovy at this time. This thesis investigates the spatial and temporal variability of copepod abundance and growth, and their impact upon the spawning of anchovy. Sampling was conducted monthly between …
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Fecundity and Survival of the Calanoid Copepod <i>Acartia tonsa</i> Fed <i>Isochrysis galeana</i> (Tahitian Strain) and <i>Chaetoceros mulleri</i>
… composed primarily of Acartia tonsa, a calanoid copepod. Acartia tonsa was collected from the estuarine waters of Davis Bayou and bloomed in outdoor tanks from which it was harvested and fed to red snapper larvae. We are developing a more controlled copepod mass culture system to support finfish …
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Biodiversity assessment of groundwater-dependent ecosystems in Malta : evaluating copepods as bioindicators of groundwater health
… ecosystems (GDEs) in Malta, focusing on copepods as bioindicators of groundwater health. Groundwater is essential in sustaining GDEs, yet these ecosystems remain underexplored, particularly in terms of local biodiversity. The aim of this research is to assess the biodiversity of …
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Temporal and spatial changes in the abundance and size structure of copepods in the southern Benguela : 1988 to 2000
Copepod abundance data were collected during the annual pelagic fish spawner and recruit stock assessment surveys, in summer and winter from 1988 to 2000. These data were used to examine temporal and spatial variability in abundance and community structure of copepods in the southern Benguela, by …
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