Kristineberg Marine Research Station: projects/activities

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Directory entires that have specified Kristineberg Marine Research Station as one of the geographic regions for the project/activity and are included in the AMAP, ENVINET, SAON and SEARCH directories. Note that the list of regions is not hierarchical, and there is no relation between regions (e.g. a record tagged with Nunavut may not be tagged with Canada). To see the full list of regions, see the regions list. To browse the catalog based on the originating country (leady party), see the list of countries.

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Displaying: 1 - 20 of 68 Next
1. Marine food webs as vector of human patogens

Marine foodwebs as vector and possibly source of viruses and bacteria patogenic to humans shall be investigated in a compartive north-south study. Effects of sewage from ships traffic and urban settlements, on animals of arctic foodwebs will be studied.

Pathways Biological effects Hydrography Fish Discharges Pollution sources Environmental management Contaminant transport Terrestrial mammals Shipping Polar bear Exposure Arctic Local pollution Seabirds Shellfish Food webs Waste Human health Human intake Marine mammals
2. Interactions between meiofauna and mat-forming microbes at the sediment-water interface - implications for benthic-pelagic coupling in coastal systems

The project investigated small-scale biotic interactions between laminated microbial communities and meiofauna at light-exposed sediment-water boundaries of estuarine lagoons. The production and biological structure of these systems is mainly determined by complex processes at the sediment-water interface which depend on finely scaled patterns, requiring appreciation of how the biota interact within these scales. We tested whether changing light conditions and active emergence of the harpacticoid species Mesochra lilljeborgi and Tachidius discipes are mediated by the activity of benthic oxygenic and anoxygenic phototrophic microbes. Two hypotheses were tested which addresses to the question of causality between changing light conditions and active emergence of the harpacticoid copepods. (1)The harpacticoid copepods T. discipes and M. lilljeborgi will enter the bottom water during daylight when oxygenic photosynthesis of cyanobacteria and eukaryotic algae is blocked and conditions at the sediment-water interface have turned anoxic. (2)Both species will not emerge during dark exposures when transferred to sterilized sediments.

Biological effects Biology copepod microbial communities interactions Sediments Ecosystems
3. Life cycle strategies linked to adult development and reproduction in the Northern krill, Meganyctiphanes norvegica. Study of the Gullmarsfjorden population.

To recognize some life cycle strategies linked to adult development and reproduction in the Northern krill, Meganyctiphanes norvegica, in the Gullmarsfjorden population. Sampling of krill and analyses of the distribution of sex, body-size, moult and reproductive development stages.

Biology Meganyctiphanes norvegica krill life cycle
4. Interactions between appendicularian and copepod grazing on dinoflagellate blooms

To be completed.

Biology copepod grazing dinoflagellate blooms Food webs Diet
5. 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. Our initial objective was to develop a method with this animal where clear behavioural responses could be related to various stimuli. By tethering the animals it was hoped that it would be possible to look at the responses of Meganyctiphanes norvegica to subtle changes in light intensity, of the range they might be expected to experience in their natural habitat. Concomitant with the main objective, animals were sampled over 24 hours to look for the presence of clock proteins and examine the movements of visual pigments. To relate any pigment migration to changes in light intensity that the animals might have experienced in situ, animals were also exposed to known quanta of light and then fixed.

Biology euphausiids swimming behaviour Meganyctiphanes norvegica light intensity pigment
6. The significance of localised nutrient regeneration for the development and maintenance of nuisance macro-algal blooms in shallow embayments

The main objective was to investigate the importance of the sediment as a nutrient source for blooms of nuiscance filamentous algae. Nutrient fluxes from the sediment were hypothesised to be of greater importance in maintaining algal biomass than were nutrients originating from the overlying water column. We aimed to assess the relative importance of algal mats on sediment geochemistry and nutrient release under stillwater and controlled flow conditions. Using nutrient fluxes as a surrogate for ecosystem function, we wished to investigate the role of species richness in maintaining the integrity of nutrient diagenesis. In this context, it is not necessarily the number of species that is important in maintaining nutrient supply to algal blooms, but the contribution individual species make to mediate nutrient release.

Biological effects Biology bloom filamentous algae nutrient flux Sediments
7. Metabolic and behavioural reactions of Nordic krill, Meganyctiphanes norvegica, from Gullmarsfjorden towards environmental factors

The phsyiological and locomotive reaction to factors that influence environmental behaviour of Nordic krill from the Gullmarfjorden were studied in terms of swimming energetics, predator avoidence and food utilization. In a newly developed experimental approach, individuals were maintained under defined conditions in flow through chambers and continuously monitored for swimming activity and oxygen consumption. Chemical, physical and biological parameters were applied and the reaction of the krill determined. Stress levels, defined this way, will serve as a reference for unfavourable conditions in the field. Thermal characteristics of digestive enzymes from the midgut gland were furthermore identify the optimum conditions for nutrient assimilation. The results will contribute to the understanding of diel vertical migration, dispersion and aggregation of krill which, in turn is essential for the interpretation of ecosystem dynamics and trophic interactions.

Biological effects Biology krill predator avoidence swimming energetics food utilization oxygen consumption
8. Reproductive dynamics of the two-spotted goby (Gobiusculus flavescens)

The project as a whole consists of a number of sub-projects which are: a) Is female coloration a signal of quality? b) Do males conduct post-spawning mate choice through differential filial cannibalism? c)Do female preferences for male size change throughout the season? d)Do female common gobies compete for access to high-quality males? e)Are male reproductive decisions influenced by prior expectation of female quality? f)How is male-male competition over nest sites influenced by resource holding potential and resource value? g)How do parasites influence mate preferences in two-spotted gobies?

Biology two-spotted goby Gobiusculus flavescens reproduction
9. Feeding biology of the cyclophoran Symbion pandora

Symbion pandora is a commensal on Norway lobster (Nephrops norvegicus) with a very complicated life cycle. The species was described very recently and appointed to a new phylum, Cycliophora. Obviously nothing is known about the biology of this animal. The present study investigated the feeding biology of Symbion pandora. This was investigated by offering them two different high quality food items: Algae and mussel. Additionally, incubations with radiolabelled dissolved amino acids were done to estimate the energy contribution from DOM. A specific goal was to quantify the amount of organic matter taken in during one meal and estimate how much this contributes to the total energy requirement of internal budding, production of larvae etc. during the life cycle of the cycliophoran. This was done by autoradiography and radiolabel incorporation.

Biology Feeding biology Symbion pandora Nephrops norvegicus Cycliophoran
10. Study of the mechaninsms of inorganic carbon acquisition in macroalgae of the Swedish westcoast

The aim of our work was to study the occurrence of inorganic carbon pumps in the cell membrane and their importance in the supply of C for photosynthesis in different macrophyte species. This was performed by checking and comparing responses of several green, brown and, especially, red marine macroalgae species under CO2 disequilibrium conditions in the presence of buffer and/or inhibitors of carbon uptake. In addition, the effect of the different treatments was also checked in the marine phanerogam Zostera marina.

Biological effects Biology photosynthesis CO2 macrophytes
11. Actographic analysis of benthic activity response to food income.

The activity pattern is recorded by new techniques of real-time video tracking of the benthic activity. Electronic intelligent sensors allow the time analysis of benthic numeric objects with intensive automated recording sessions. We record the natural behaviour of several animals over 24h cycles. We also look into possible antagonistic behaviour, i.e. how animals feed when they have tubes close to each other and when feeding may occur in the same patches. Comparison is made between active motile surface deposit feeders and tubicolous surface deposit feeders. Activities of Amphiura filiformis, A.chiajei (motile burried Ophiuroids) and Melinna cristata (tubicolous Polychaete) are extracted by image analysis and quantified. Amphiura activity is restricted to its deposit feeding mode and no suspension feeding is present in the experiments. We also examine how addition of phytoplankton to the sediment will affect the feeding activity and if Amphiura and Melinna can locate patches of food. Dynamics of the response to food addition is studied.

Amphiura Biology Feeding behaviour interaction Melinna Sediments
12. Energetics of copepods in non-steady state food conditions

Most studies of energetics in marine filter feeders have focused on animals living in steady state food conditions. However, copepods experience highly variable access to food because of food patchiness and behavioural avoidance of predators. For small copepods this is especially important since they lack the potential of energy storage, e.g. in the form of lipids. After a period of food deprivation Acartia tonsa show a compensatory increase in ingestion rate, but only temporarily and on the time scale of the gut filling time. The copepods are able to compensate for the lacking input of food. On the other hand, longer periods of starvation (6-14h) induce elevated ingestion rates that lasts longer than gut filling time. Under these circumstances other energetic factors influence the ingestion rate. Consequently, the energetics of the copepods are highly variable in a patchy food environment.

Biology ingestion rate energetics food patchiness copepods Food webs
13. Benthic Flux rates. Measurement of flow rates through and fluxes from individual tubes and burrows of benthic organisms

To asses the utility of a new range of microelectrode sensors in measuring the flux rates of oxygen and nutrients across the sedimentary diffusive boundary layer and into and through macrofaunal tubes and burrow structures.

Biological effects Biology oxygen polychaete bioturbation Sediments
14. Photosynthesis in marine macrophytes: Investigations into the feasibility of using PAM flurometry for measuring in situ photosynthetic rates and comparisons between PAM flurometry and gas exchange (O2 evolution and CO2 uptake)

To be completed.

15. Bioaccumulation, physiological and biochemical effects of pollutants in mussels

In order to evaluate the capacity of mussels to accumulate pollutants and to enhance growth and physiological effects, an investigation was carried out in the Faroe Islands and in the Skagerrak. In March 2000, about 1500 mussels of proper dimensions (length ranging between 5 and 6 cm) were collected in the Kaldbak Fjord (Faroe Islands) on a 10m water column. Selected mussels were divided in 4 groups (320 each) and deployed in 4 different stations (one at the Faroe Islands and three in the Skagerrak). Semipermeable membrane devices (SPMDs) were also deployed in the same stations for the preconcentration of lipophilic pollutants. One month later (end of April-beginning of May) mussels and SPMDs were recollected and sent to different laboratories for the determination of various parameters.

Mytilus Biological effects Biology scope for growth Organochlorines PCBs Heavy metals PCB bioindicator PAHs Long-range transport Contaminant transport Exposure PAH Persistent organic pollutants (POPs) Dioxins/furans SPMD bioconcentration
16. Macro-evolutionary Issuses in Aplacophoran Development

This project was initiated the previous year under a LSF funding. Its purpose was to provide a detailed descriptive, experimental and molecular study of aplacophoran embryology and larval development in the context of the current macro-evolutionary and developmental issuses. Research was to focus on the aplacophoran chaetoderm Chaetoderma nitidulum which is readily available at Kristineberg Marine Research Station. Aspects of aplacophoran development to be examined were the following: 1. Basic embryology and larval development. 2. Specification of the dorsal-ventral organizer and mesoderm. 3. Development of the larval and adult musculature systems and larval sensory organs. 4. Expression pattern of the engrailed gene and protein.

17. Study of Amphiura filiformis bioluminiscence

Amphiura filiformis is a common brittlestar founded in abundance in the vicinity of Kristineberg Marine Station. Despite numerous ecological studies on aspect of it's biology remains unclear, the animal is luminous and nearly nothing is known on the phenomenon. This project aimed firstly to describe morhological, physiological and ethological aspects of the bioluminescence of Amphiura filiformis and secondly to investigate the mechanism and role of regeneration on the recovery on bioluminescence.

Amphiura Biology bioluminescence
18. Interactions among infauna, microorganisms and polycyclic aromatic hydrocarbons in marine sediments

Dose-response experiments using 5 different sediment concentrations of fluoranthene (Flu) and pyrene (Py) respectively. Measuring radioactive marked Flu and Py in brittlestars and polychaetes and microbial degradation of Flu and Py in sediment. Also growth rate of brittlestars and polychaetes and determination of regenerationtime of brittlestar-arms.

Biological effects Biology PAHs microorganisms Petroleum hydrocarbons infauna Exposure Sediments
19. Effects of storage lipids on the repoductive potential of the copepod Calanus Finmarchicus in Gullmarsfjorden, Sweden

To be completed.

Biology Reproduction
20. Systems of intraspecies communication in Meganyctiphanes norvegica and construction of meter system for low light in deep water

To be completed.