Sweden: projects/activities

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Displaying: 141 - 160 of 228 Next
141. Phytoplankton research and Pelagic Monitoring

Dinophysis spp and the Koljö fjord. It has been known since some years that blue mussels in the fjord system north of Orust very seldom or never contains the diarrhetic shellfish toxin (DST) at the same time as toxic mussels can be found at the mouth areas of the fjord system. Our research has shown that the causative organism, the dinoflagellate Dinophysis spp, generally do not occur in the fjords while high abundance’s were found outside the mouth, although there is a tidal exchange and a net current flowing through the fjord system. Field and laboratory experiments have so far demonstrated that growth and survival of Dinophysis is less in the Koljö fjord compared to controls. We are for the moment looking at what factors may control these processes. This is part of the Ph.D. work by Fredrik Norén within the MISTRA project "Recycling of nutrients from sea to land using mussel culture".(http://www.mistra-research.se) Molecular identification of Dinophysis spp. Dr Ann-Sofi Rehnstam-Holm, after a postdoctoral position at the Woods Hole Oceanographic Institution (USA) will start working at Göteborg University and at Kristineberg on a MISTRA-project concerning new detection methods for Dinophysis. These methods consists in species specific identification by molecular probes and by a sophisticated signal amplification system, they are ready to be tested in the field at Kristineberg in co-operation with the MISTRA(http://www.mistra-research.se) project "Recycling of nutrients from sea to land using mussel culture". Production of DST by Dinophysis spp. Our experience since several years is that the Dinophysis species do not always contain DST. Recently a database containing all observations on phytoplankton from 1989 and onwards from the Gullmar fjord area was completed. This database will now be run against other databases containing environmental data, since it is known that the toxin production of many dinoflagellates may depend on nutrient stress. Together with professor Edna Granéli (http://www.hik.se) we are also planning laboratory experiments which hopefully will increase the knowledge about toxin production of Dinophysis. Uptake and fate of pathogenic microbes in the blue mussel, Mytilus edulis Linneaeus. The aim of this research project, which also is part of the M.D. work of Bodil Hernroth (BSc.), will contribute to increase the knowledge of how mussels process pathogenic bacteria and viruses, to try to predict which microbes may reach humans when consuming mussels. Comparative and quantitative studies of endocytos, anti-microbial activity, exocytos and elimination of pathogenic microbes by the mussels will be carried out. This project is a part of the MISTRA (http://www.mistra-research.se) project "Recycling of nutrients from sea to land using mussel culture" in close co-operation with Prof. Lars Edebo (M.D. supervisor) at the Institute of Laboratory Medicine at Gothenburg University (http://www.medfak.gu.se). Time-series analysis of pelagic data in the Gullmar fjord. Dr Andrea Belgrano (ecosystems ecologist), has a two-year individual postdoctoral fellowship position at Kristineberg funded by the European Commission (EC) within the Marine Science and Technology Programme (MAST III), is now working with advanced time-serie analysis on the project : " Plankton Community Dynamics in Relation to Water Exchange: The Gullmar Fjord Time Series Data Set- EC-MAST III - individual postdoctoral fellowship Research Project (MAS3-CT96-5028). (http://www.ecology.su.se/databases/biomad/lajos/pm32.htm). For the analysis of the time series data set co-operation have been established with Prof. Björn Malmgren, Göteborg University ( http://www.gmf.gu.se/Departments/MarineGeology.html), Dr. Andrew R. Solow , Woods Hole Oceanographic Institution (http://www.whoi.edu/mpcweb/), Dr. Mercedes Pascual, University of Maryland (http://www.umbi.umd.edu/~comb/index.html) and Dr. Peter Turchin, University of Connecticut (http://www.eeb.uconn.edu/) The exchange of deep-water of the Gullmar fjord. The hydrography and oxygen situation of the deep water of the Gullmar fjord has been monitored monthly for 20 years within different research and monitoring programmes. The ongoing analysis of this time-series will focus on the detection of trends and periodicity in the observed oxygen fluctuations, as well as on the changes in the timing and extent of the annual exchanges of the deep-water. The data analysis will benefit from the established co-operation with physical oceanographer at the Oceanographic Institution at Gothenburg University. Modelling of onshore and offshore marine populations. We are partner in a collaborative Virtual University Education Programme(http://www.umbi.umd.edu/virtue/index.html) established between Gothenburg University, and the University of Maryland (USA) in relation to the project " The temporal dynamics of vibrios in aquatic environments ". The objective of this project will focus on a better understanding of the dynamics of the bacterium Vibrio cholerae in aquatic ecosystems in relation to climatic and environmental forcing, as well as the role played by plankton as a potential reservoir for Vibrio cholerae outbreaks. This project will run for three years (1998-2000) and will involve a co-operation on new methods for the analysis of time series data and plankton dynamics between Dr. Mercedes Pascual and Dr.Anwar Huq at the Center of Marine Biotechnology, University of Maryland, Baltimore,U.S.A (http://www.umbi.umd.edu/~comb/index.html), Dr. Andrea Belgrano and Dr. Odd Lindahl at Kristineberg Marine Research Station (KMF) and Prof. Björn Malmgren at the Department of Earth Sciences - Marine Geology, Earth Sciences Center, Göteborg University (http://www.gmf.gu.se/Departments/MarineGeology.html)

Biology Modelling
142. Marine benthic fauna - ecological processes

The research encompass many various aspects of benthic infaunal processes: effects of faunal bioturbation and irrigation activity in differnet faunal successional stages on sediment chemistry; trapping and transformation of organic matter by different functional groups population interspecific competition effects of oxygen deficiency on benthic habitat succession and infaunal behaviour analysed by in situ sediment profile imaging and in laboratory experimets the importance of infaunal activity and food quality on the fate of organic contaminants chemical communication in amphiurid (brittle-star) populations.

Biology Sediments
143. 1. Behaviour of individual copepods in the laboratory when exposed to patchiness of food and varying predation risk, 2. Distributions of copepods and microzooplankton in the field, 3. Distribution of marine snow in the field and association to grazing di

1. Behaviour of individual copepods in the laboratory when exposed to patchiness of food and varying predation risk Copepods experience a variable food environment with favourable patches interspersed with large volumes of water with too low food concentration to sustain growth and development. Critical traits in copepod behaviour are therefore the ability to detect and remain in patches of food, and at the same time avoid predation. The objectives of the project are to quantify patch responses of selected small copepods and to observe how predator presence may affect foraging behaviour. Methods include video observations in small aquaria and bottle incubations with defined patches of food. Laboratory experiments showed that copepods have the ability to find and remain in food patches and that this was beneficial for them in terms of reproduction. Predation enhanced the advantage to stay in patches since increased predation risk was associated with food search. 2. Distributions of copepods and microzooplankton in the field The vertical distribution of copepods and their prey potentially has a strong impact on predator-prey interactions in the pelagic environment. The project aims at quantifying the small-scale (metre) distributions of these organisms. Since plankton nets are unsatisfactory at this resolution, an in situ video camera designed to observe copepods has been developed. The observations with the camera are amazing, a hitherto unknown world can be revealed. Results from filming with the camera shows that copepods sometimes aggregated around the pycnocline, but rarely respond to in situ fluorescence, a crude measure of food abundance. The distribution will be a balance between the swimming capabilities of the copepods and the turbulence field. At present, models have been developed that predict the distributions, and the project is in a field testing phase. 3. Distribution of marine snow in the field and association to grazing dinoflagellates The particle dynamics during blooms of phytoplankton has received considerable attention recently. It has been shown that physics will have a profound impact on the fate of phytoplankton blooms and this project aims at clarifying the combined role of physics and biology on the decline of phytoplankton blooms. In two field studies, simple coagulation theory has been successful in predicting bloom dynamics. In the Gullmarfjord, Sweden, a spring bloom ended rapidly following a storm event and mass sedimentation of marine snow was observed by in situ video recordings. Grazing by heterotrophic dinoflagellates prevented further recovery of the diatoms. In a second field study in the Benguela upwelling region, South Africa, continuous aggregation of large diatoms was observed. No sedimentation occurred, however, and the reason was found to be colonisation and grazing on the aggregates by the dinoflagellate Noctiluca scintillans. 4. Hunger responses in copepods exposed to variable food supply Food patchiness and the necessity to avoid predators means that copepods will have highly variable access to food. The aim of this project is to study dynamics of ingestion under non-steady state food conditions. Small copepods that do not store lipids have a limited capacity to survive periods of low food and should be adapted to fast and efficient utilisation of ephemeral food patches. The experimental protocol includes traditional bottle incubations with copepods and diatoms, high abundances and small bottles are used to detect fast changes (min-hours). The results show that brief periods of starvation (1-3 h) stimulated ingestion, but only temporarily on time scales of gut filling times. In contrast, longer starvation times (6-14 h) lead to elevated ingestion rates lasting longer than gut filling time. This could indicate changes in the assimilation efficiency and experiments are planned on the topic for January 1999.

Biology
144. Shrimp taxonomy and ecology - associations and distribution of cryptic shimps in the coral reef environment

This project aims to reveal more understanding in the species diversity and distribution of cryptic shrimps in coral reefs. Since these shrimps associate with other invertebrates to find food and shelter, they are often species specific in their choice of host organism. This is an important limiting factor in their distribution that is studied. Also the some 'species complex' found among shrimps inhabiting sea anemones are studied if they are separate species or not, using both taxonomical and ecological data! The impact of habitat diversity on the speciation of these associated shrimps is also studied. -------------------------------------------------------------------------------- Areas studied: The taxonomy and ecology of the shrimp fauna in three geographically different areas of the Indian Ocean - Inhaca Island, Moçambique, Phuket Island, Thailand and the coast of Western Australia.

Biology
145. Effects on marine organisms of sediments contaminated with tributyltin with special reference to sub-arctic and arctic conditions,Effects of TBT- and triazine/copper based antifouling paints on the early development of cod, Effects of antifouling agents

Effects on marine organisms of sediments contaminated with tributyltin with special reference to sub-arctic and arctic conditions The use of antifouling paints based on tributyl tin (TBT) is now restricted in most European countries. However, the prohibition involves only vessels less than 25 m length. As a result many coastal areas and harbours show raised levels of TBT in water and sediment, high enough to cause effects on sensitive organisms. Dredging operations in such areas may increase exposure of organisms to TBT. As the degradation processes are temperature dependent contamination by TBT in arctic or sub-arctic waters may be more serious. The specific objectives of this study, which is performed in co-operation with the University of Iceland (Prof. J. Svavarsson), are to evaluate a/ the effect of temperature on the uptake of TBT by the gastropod Buccinum undatum during exposure to TBT-contaminated sediment and b/ the effects of contaminated sediment on the development of imposex (penis and vas deferens development of females) at different temperatures.The project involves both laboratory experiments and field studies. The project started in late autumn 1995 and results are not yet available. Effects of TBT- and triazine/copper based antifouling paints on the early development of cod Elevated amounts of components from antifouling paints has been found in sediment and in organisms in Icelandic coastal waters. Also imposex in dogwhelks and whelks has been observed. In order to evaluate any impact on the economically important fishery and especially focused on cod, experiments are performed in the laboratory following the early development of the fish from fertilization up to hatching when exposed to antifouling components. No results are yet available. Effects of antifouling agents in the marine environment. Early development in lumpsucker (Cyclopterus lumpus) preliminary studies. The objectives of the study are to reveal the effects of chemicals from antifouling paints on the development of the lumpsucker (Cyclopterus lumpus) - in situ and under laboratory conditions. The study focuses on TBT (tributyltin) and a chemical, Sea-nine, replacing TBT as the major toxic agent. We will evaluate the effects of TBT in the laboratory and under field conditions, but Sea-Nine under laboratory conditions only. Laboratory studies are based on the use of flowthrough conditions with different concentrations, while in the field studies we use cages with eggs and larvae. The eggs of the lumpsucker are allowed to glue to glass slides following fertilization. These are then easily transferred to either laboratory set up or into small cages, which will be set out at different distances from harbours. Also semipermeable membrane devices (SPMD:s) will be used in order to determine the actual water concentrations. The effects of TBT from the harbours is evaluated by measuring imposex in gastropods (Nucella lapillus) at the coastline. The mortality of the eggs and the larvae is determined and different physiological measurements are made in order to detect sublethal effects of the contaminants in question. The project has just started and no results are yet available.

Biology Local pollution
146. Regeneration and Bioluminescence in Amphura filiformis

This project is a part of a long term study of an ophiuroid species used as a model to monitor finctional recovery of newly formed arms.

Biology Amphiura filiformis Bioluminescence
147. 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).

Biology
148. Reproduction and feeding of the commensal Symbion pandora

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

Biology
149. 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.

Biology
150. 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.

Biology
151. 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.

Biology
152. 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.

Biology
153. 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.

Biology
154. Supply side ecology: the links between larval supply and recruitment for soft sediment benthic communities in the North Sea

The main objective of the project were to collect and process various different populations of selected benthic species to determine, in combination with existing research, the following:

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

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

Biology
156. 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.

Biology
157. 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:

Biology
158. 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.

Biology
159. 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.

Biology
160. 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).

Biology