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Displaying: 221 - 240 of 382 Next
221. European collaboration: Benthic Marine Research Feast or Famine: How to be asuccesful marine benthic consumer

Laboratory studies have demonstrated that M. edulis close its shell and stops pumping when the algal concentration becomes below 1500 cells cm-3 of Phaeodactylum tricornutum equivalent to 1 mg Chl-a m-3 (riisgård and Randlov, 1981; Riisgårs , 1991).

222. Reproduction and feeding of the commensal Symbion pandora

We investigated the reproductive and feeding biology of the commensal Symbion pandora (Cycliophora).

223. Bioturbation by macrobenthic functional group. Interaction, modeling and effects on sediment biogeochemistry

In order to improve and calibrate each elementary model an the global bioturbation model, data from laboratory experiments involving different more or less complex nacrobentihic communities (represented by different bioturbation functional groups) are nedded.

224. Regeneration and Bioluminescence in Amphiura filiformis

In previous studies undertaken at KMRS we have been investigating the link between regeneration and the functional recovery of bioluminescence in the arms of Amphiura filiformis.

225. Quality signalling, parasites and sexual selection: gobies as a model system

The main objective of the project was to investigate yje reproductive dynamics of the two-spotted goby, a small semi-pelagic fish abundant along rocky shores of Northern Europe.

226. Lipids, Buoyancy and vertical distribution of calanoid copepods

To measure overall densities of overwintering copepods from Gullmarsfjorden in order to understand the role of lipids in their vertical distribution and buoyancy.

227. Investigation of the ontogeny and phylogeny of certain glial cells in Bilateria

In secretory cells of the vertebrate floor plate and subcommissural organ are descendant of an ontogenetically ancient type of radial glial cells.

228. Behavioural responses of the nordic krill (Meganyctiphanes norvegica) to light

To examine the effect of light intensity on swimming activity in Krill.

229. Ciliary upstream-collecting in marine filter-feeding invertebrates

The main objective was to study the basic mechanism of ciliary upstream-collecting on a selected marine invertebrate.

230. Variation in primary sex characters in goldsinny and corkwing wrasse in relation to variation in mating system

Variation in primary sex characters of wrasse in relation to reproduction strategy and environmental conditions:

231. Feast or famine: how to be a successful marine benthic consumer

Five French Scientists orginating from the Observatoire Océnologique de Banyals, stayed at the Kristineberg Marine Station during two weeks.

232. Proximate ecological controls on the swimming behaviour of coastal euphausiids

To examine the way in which light intensity and spectrum affects the swimming behaviour and activity of the pelagic euphausiid Meganyctiphanes norvegica.

233. Cell lineage and gene expression during cleavage and larval development of Meganyctiphanes norvegica (Crustacea, Malacostraca, Euphausiacea)

The project is part of a large comparative study on the evolution of the development of crutaceans, mainly malacostracans (higher crustaceans).

234. Climate Change and Competitive Interactions

The effects of climate change in a dynamic competitive interaction between two or more species can be bought about either as direct responses of species to change or indirectly through effects on competing species. Intertidal barnacles are ideal model organisms to test these alternative causal mechanisms, being easily censussed and directly competing for space. Single- and multi- species models will be developed for barnacles in SW England to determine whether direct or indirect mechanisms better predict responses to change. The models will include functions for space-limitation, environmental influence and, in the latter models, functions for interspecific competition. Historical data from a network of sites collected over a 40-year period will be used to develop and test the models.

Climate variability Spatial trends Climate change Biodiversity Temporal trends Ecosystems
235. Reducing the environmental impact of sea cage fish farming through the cultivation of seaweeds

Although the most visible effect of fish cage aquaculture is the output of particulate organic waste, 80% of the total nutrient losses from fish farming are plant-available as potentially eutrophicating substances. This project will assess the ability of commercially important seaweeds, cultivated in the immediate vicinity of caged fish, to reduce the impact of such nutrient releases. The algae cultivated in high nutrient sites will be tested as a food source for humans and for cultivated shellfish, and a model of the distribution of dissolved contaminants from sea-cage fish farms will be developed to predict the impact of introducing algal cultivation at any site.

Pathways Biological effects Fish Spatial trends Environmental management Contaminant transport Food webs Sediments Pesticides Temporal trends Ecosystems
236. Environmental sensitivity of cold water corals

Distribution • What is the current distribution of coral colonies in the North Sea? • Where are coral colonies located on the structures? • Do any colonies show evidence of exposure to drill cuttings? Monitoring & Environmental Recording • What hydrodynamic regime and levels of suspended particulate material are coral colonies exposed to? • Does the coral skeleton retain an archive of any past contamination? • Does skeletal growth vary over time and does this correlate with any past contamination? • How variable is the rate of coral growth and does this correlate with any environmental variables? Environmental Sensitivity • What effect does increased sediment load have on coral behaviour and physiology? • What effect does exposure to discharges (e.g. cuttings and produced water) have on coral behaviour and physiology? • Are such exposures realistic in the field?

Shelf seas Biological effects Pollution sources Environmental management Contaminant transport Petroleum hydrocarbons Oceanography Biodiversity Local pollution Ecosystems
237. The Effects of Turbidity on Marine Fishes

(a) To assemble and further develop an integrative methodology for in situ evaluation of the effects of turbidity and hypoxia on fish physiological and/or behavioural performance. (b) To determine experimentally the threshold values beyond which oxygen and turbidity levels are liable to alter fish physiological and/or behavioural performance. (c) To integrate the results obtained in a conceptual and predictive model. Main expected achievements: [1] establishment of a link between laboratory studies, studies in mesocosms and field studies, using the most advanced techniques for monitoring behaviour in various environmental conditions. [2] an understanding of the impact of water turbidity and oxygenation on three major components of the behavioural repertoire of fish: habitat selection, predator-prey interactions and schooling-aggregation. [3] Predictive ability for the effect of the environmental variables studied on ecologically relevant behaviour.

Shelf seas Biological effects Fish Environmental management Local pollution Food webs
238. Bacterial diversity in marine sponges

The aim is to study the diversity and function of marine bacteria closely associated with marine sponges. The special character of life strategy of the community (symbiosis – commensalism), with special emphasis to the identity and the recruitment of bacteria during live cycle of the sponges will be described.

Shelf seas Biological effects Biodiversity Ecosystems
239. Bacterial populations in the pelagic foodweb

Since nearly all microalgae are associated with bacteria and some harbor intracellular bacteria, it is most likely that these bacteria are involved in the development or termination of natural occurring plankton assemblages. The diversity and development of associated bacteria in microalgae cultures and during phytoplankton succession will be described by molecular analysis of the bacterial community structure and by phylogenetic analysis of involved microorganisms.

Shelf seas Biological effects Biodiversity
240. Bacterial diversity in echinodermata

Little is known about the consistency or phylogenetic affiliation of accociated intra- or extracellular bacterial populations in Echinodermata. Because certain taxa harbour bacteria and other not, these associations are presumably originated by coevolution and not by ecological circumstances. The intestine of echinodermata is populated by huge amounts of bacteria. Due to the different feeding strategy of echinoderms it is controversly discussed whether these bacteria are passively taken up or if they are permanently present. Hence it will be possible to elucidate if vertical transmission occurs or bacteria are recruted. With the knowledge of phylogenetic affiliations of microbial symbionts and their distribution (or localization) in different hosts, the physiological/biochemical status of the association will be investigated. The main emphasis will be the characterization of the in situ situation by adequate histological techniques (crysectioning) and “passive” (FT-IR) or “active” chemical imaging (confocal imaging, using fluorescent enzyme substrates or physiological dyes). The main experimental work in this WP bases on the creation of 16S-rDNA sequence libraries of echinoderrm associated bacteria (SCB & intestinal). Signature sequences will be analyzed and specific gene probes will be designed and applied.

Shelf seas Biological effects Biodiversity Ecosystems