A5017816823- Marine and coastal ecosystems
- Marine and fisheries research
- Marine Biology and Ecology Research
- Aquaculture Nutrition and Growth
- Marine Bivalve and Aquaculture Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Isotope Analysis in Ecology
- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Algal biology and biofuel production
- Environmental Toxicology and Ecotoxicology
- Marine Biology and Environmental Chemistry
- Reproductive biology and impacts on aquatic species
- Animal Behavior and Welfare Studies
- Microbial Community Ecology and Physiology
- Physiological and biochemical adaptations
- Arctic and Antarctic ice dynamics
- Coral and Marine Ecosystems Studies
- Ocean Acidification Effects and Responses
- Protist diversity and phylogeny
- Aquaculture disease management and microbiota
- Environmental DNA in Biodiversity Studies
- Food Industry and Aquatic Biology
- Marine and coastal plant biology
- Crustacean biology and ecology
Roskilde University
2014-2023
Technical University of Denmark
2012-2018
University of Copenhagen
1991-2012
NILU
2011-2012
UiT The Arctic University of Norway
1990-2004
Heidelberg University
2002-2004
University Medical Centre Mannheim
2004
University Hospital Heidelberg
2002-2003
Rigshospitalet
1995
Danish Centre for Marine Research
1988
Size selectivity spectra of 28 planktonic predators from 18 studies in the literature are compared. The linear size ratio between and their optimal prey is 1 : for a dinoflagellate, 3 other flagellates, 8 ciliates, rotifers copepods, ∼50: cladocerans meroplankton larvae. These ratios seem consistent within groups, validity supported by quantitative information literature. However, difference filter feeders raptorial‐interception feeders, preferring relatively smaller larger respectively,...
In order to study the size dependency of grazing and growth rates in zooplankton, data were collected from laboratory studies literature, covering both limnic marine organisms. Data obtained about 60 species nano‐, micro‐, mesozooplankton, representing flagellates, ciliates, rotifers, meroplankton larvae, copepods, cladocerans. Estimates maximum ingestion clearance extracted functional responses (ingestion as a function food density) established experiments. Maximum specific expressed...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 179:13-25 (1999) - doi:10.3354/meps179013 Seasonal variation in nutrients, pelagic primary production and grazing a high-Arctic coastal marine ecosystem, Young Sound, Northeast Greenland Søren Rysgaard1,*, Torkel Gissel Nielsen2, Benni Winding Hansen3 1National Environmental Research Institute, Deptartment of...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 204:65-77 (2000) - doi:10.3354/meps204065 On trophic coupling between protists and copepods in arctic marine ecosystems Henrik Levinsen1,*, Jefferson T. Turner2, Torkel G. Nielsen1, Benni W. Hansen3 1National Environmental Research Institute, Department of Ecology, Frederiksborgvej 399, PO Box 358, 4000...
Black soldier fly ( Hermetia illucens ) larvae can convert biowaste and by-products into body mass high in protein (~40% dry matter, DM) lipid (~30% DM). However, the type of rearing substrate also affects larval composition thus its nutritional value. Hitherto, it remains unclear how to what extent be altered by substrate. This study was therefore performed examine possibilities modifying using different substrates. To investigate this, 5-days old were reared for seven days on locally...
The use of live prey is still necessary for a large number raised fish species. Small sized rotifers are usually used as preys during the first days feeding in small mouth fish. An alternative to this copepods feeding. In study, sizes, weight and biochemical contents two one rotifer species on similar algal food conditions were compared. Rotifers contained higher proportion essential amino acids free acid (FAA) fraction (43%) than (30–32%). However, had lower levels important fatty like DHA...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 125:239-257 (1995) - doi:10.3354/meps125239 Plankton community structure and carbon cycling on western coast of Greenland during after sedimentation a diatom bloom Nielsen TG, Hansen B Pelagic food web dynamics were studied in Disko Bay, Greenland, following breakup sea ice June-July 1992. Bay was influenced...
We developed new perspectives to identify important questions and propose approaches for future research on marine food web lipids. They were related (i) structure function of lipids, (ii) lipid changes during critical life phases, (iii) trophic marker (iv) potential impact climate change. The first addresses the role lipids in membranes, storage buoyancy with following key question: How are properties membranes deposits affected by various types lipids? second deals importance reproduction,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 429:125-144 (2011) - DOI: https://doi.org/10.3354/meps09065 Grazing, egg production, and biochemical evidence of differences in life strategies Calanus finmarchicus, C. glacialis hyperboreus Disko Bay, western Greenland Rasmus Swalethorp1,2, Sanne Kjellerup1,2, Michael Dünweber1, Torkel Gissel Nielsen1,2,*,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 221:209-219 (2001) - doi:10.3354/meps221209 Zooplankton feeding ecology: grazing on phytoplankton and predation protozoans by copepod barnacle nauplii in Disko Bay, West Greenland Jefferson T. Turner1,*, Henrik Levinsen2,**, Torkel Gissel Nielsen2, Benni Winding Hansen3 1School for Science Technology,...
In laboratory experiments, the bacterial flora of zooplankton microbial environments seawater, fecal pellets and associated with external internal surfaces copepod Acartiatonsa (Dana) were examined. The bacteria dominated by Bacillus spp., Cytophaga/Flavobacterium Vibrio spp. Pseudomonas same genera found in seawater (0.22 7mu;m filtered) which incubated. showed a characteristic growth succession, abundance increased several orders magnitude during incubation pellets, indicating...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 16:233-249 (1999) - doi:10.3354/ame016233 Plankton community structure and carbon cycling on western coast of Greenland during stratified summer situation. III. Mesozooplankton Benni Winding Hansen1,*, Torkel Gissel Nielsen2, Henrik Levinsen2 1Roskilde University, Department Life Sciences Chemistry, PO Box 260, DK-4000...
This report investigates female sizes, egg sizes and hatching rates in relation to temperature for the near-shore calanoid copepod Acartia tonsa cultured at 6, 9, 14 24°C several generations achieve acclimatization. Inverse size relationships of eggs females were revealed with increasing temperature. Eggs produced 6°C 85 ± 4 μm diameter, but decreased 80 3 24°C. Female cephalothorax length was 840 52 692 39 9 24°C, respectively Parallel experiments performed between non-acclimatized...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 447:87-108 (2012) - DOI: https://doi.org/10.3354/meps09551 Effects of a future warmer ocean on coexisting copepods Calanus finmarchicus and C. glacialis in Disko Bay, western Greenland Sanne Kjellerup1,2,4, Michael Dünweber1, Rasmus Swalethorp1,4, Torkel Gissel Nielsen1,2,4,*, Eva Friis Møller1, Stiig...
The cyclopoid copepod Apocyclops royi (Lindberg 1940) is one of two dominant mesozooplankton species in brackish Taiwanese aquaculture ponds. Periodically low n-3 polyunsaturated fatty acid (PUFA) content seston could potentially be a limiting factor for zooplankton diversity. royi's potential ability to biosynthesize PUFA was investigated through short-term feeding experiment on four microalgae. Furthermore, we analyzed the expression genes encoding putative elongase (ELO) and desaturase...