Sweden: projects/activities

Directory entires that have specified Sweden as the primary or lead country for the project/activity and are included in the AMAP, ENVINET, SAON and SEARCH directories. To see the full list of countries, see the countries list. The specified country may not be the geographic region where the activity is taking place - to select a geographic region, see the list of regions.

It is also possible to browse and query the full list of projects.

To edit or add records to any of the catalogs, log in or create an account.

Displaying: 81 - 100 of 228 Next
81. 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
82. 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
83. 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
84. 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
85. 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
86. 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
87. 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
88. 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
89. 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.

Biology
90. 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
91. 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.

Biology
92. 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
93. 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
94. Effects of storage lipids on the repoductive potential of the copepod Calanus Finmarchicus in Gullmarsfjorden, Sweden

To be completed.

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

To be completed.

Biology
96. Bioactivation of polyaromatic hydrocarbons (PAHs) in crab (Cancer pagurus), shrimps (Crangon spp and Palaemon spp) and a polycheate (Neries pelagica).

To be completed.

Biological effects Biology PAHs
97. An experimental study on stable carbon and nitrogen isotope fractionation by Meganyctiphanes norvegica - the influence of food source, assimilation efficiency and growth rate

The aim of our visit to Kristineberg was to study the stable carbon and nitrogen isotope fractionation of Meganyctiphanes norvegica in response to different food supply, and to evaluate the importance of physiological processes (assimilation and growth) in generating the new stable isotope pattern. This calibration will contribute to the evaluation of the stable isotope method as an approach to the study of food sources of animals in the field.

food Biology Meganyctiphanes norvegica krill Diet
98. Histology and immunocytology of the ectodermal nervous system in echinoderms

To be completed.

Biology
99. The regulation of iron and manganese reduction in marine sediment

To be completed.

Biology Geochemistry
100. Adult development and seasonal reproduction of the krill population of the Gullmar Fjord

The result of the previous studies of the krill population from the Gullmar Fjord (1999, 2000) indicated that the duration of the moult cycle (IMP) of adult krill is influenced bu other factors than temperature, at end of summer.

Biology