A5091215296- Isotope Analysis in Ecology
- Marine Bivalve and Aquaculture Studies
- Marine and fisheries research
- Wildlife Ecology and Conservation
- Animal Ecology and Behavior Studies
- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Marine animal studies overview
- Parasite Biology and Host Interactions
- Aquatic Invertebrate Ecology and Behavior
- Marine Ecology and Invasive Species
- Identification and Quantification in Food
- Reproductive biology and impacts on aquatic species
- Archaeology and ancient environmental studies
- Avian ecology and behavior
- Ecology and Vegetation Dynamics Studies
- Geology and Paleoclimatology Research
- Species Distribution and Climate Change
- Animal Vocal Communication and Behavior
- Fish Biology and Ecology Studies
- Aquaculture Nutrition and Growth
- Crustacean biology and ecology
- Marine and environmental studies
- Echinoderm biology and ecology
Aarhus University
2002-2025
University of Copenhagen
2024
Marine and Freshwater Research Institute
2024
Norwegian Institute of Marine Research
2024
Technical University of Denmark
2024
Abstract Aim Invasive species are of increasing global concern. Nevertheless, the mechanisms driving further distribution after initial establishment non‐native remain largely unresolved, especially in marine systems. Ocean currents can be a major driver governing range occupancy, but this has not been accounted for most invasion ecology studies so far. We investigate how well areas interconnected to later occupancy regions test potential role ocean secondary spread dynamics order infer...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 467:47-59 (2012) - DOI: https://doi.org/10.3354/meps09945 Spatial variability of carbon (δ13C) and nitrogen (δ15N) stable isotope ratios in an Arctic marine food web Joan Holst Hansen1,*, Rasmus Berg Hedeholm2,3, Kaj Sünksen2, Jens Tang Christensen1, Peter Grønkjær1 1Marine Ecology, Department Bioscience,...
Stable isotope studies of long-term ecosystem change are often hampered by lack archived tissue samples. Here, we provide a reliable method for extracting the organic matrix from fish otoliths, demonstrate differences in values between soluble and insoluble fractions, trophic enrichment factors (ε). The analyses were performed on otoliths wild-caught adult Atlantic cod (Gadus morhua) 6-month diet-switch experiment with juvenile cod. Acid hydrolysis otolith powder followed ultrafiltration...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 368:1-8 (2008) - DOI: https://doi.org/10.3354/meps07635 FEATURE ARTICLEStable isotope evidence of long-term changes in North Sea food web structure Jens Tang Christensen1, Katherine Richardson1,2,* 1Department Biological Sciences, Ecology, University Aarhus, Finlandsgade 14, 8200 Aarhus N, Denmark 2Faculty...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 438:185-194 (2011) - DOI: https://doi.org/10.3354/meps09301 Sandeel as a link between primary production and higher trophic levels on Faroe shelf Kirstin Eliasen1,2,*, Jákup Reinert1, Eilif Gaard1, Bogi Hansen1,2, Jan Arge Jacobsen1, Peter Grønkjær2, Jens Tang Christensen2 1Faroe Research Institute, 110...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 461:197-209 (2012) - DOI: https://doi.org/10.3354/meps09871 Tissue-specific turnover rates and trophic enrichment of stable N C isotopes in juvenile Atlantic cod Gadus morhua fed three different diets Torben Ankjærø, Jens Tang Christensen, Peter Grønkjær* Department Bioscience, Ecology, Aarhus University,...
Abstract Mid-water column turbulence has been shown to cause elevated vertical nutrient flux at the shelf edge in northeastern North Sea. Here, we demonstrate that phytoplankton communities this region tend be dominated by larger cells (estimated from percentage of chlorophyll captured on a 10 μm filter) than beyond edge. F v /F m (PSII electron transport capacity) corrected for photoinhibition surface layer correlated study with µm filter (assumed large cells), suggesting community was...
Summary Rodent populations in cultivated and fallow fields Tanzania were sampled by trapping. Mastomys natalensis (Smith) was far the most abundant rodent these habitats (62% or more of samples). Estimates densities this obtained removal trapping at scattered localities (range 23–236 ha ‐1 ) from a catch‐mark‐release (CMR) study through seasonal cycle 40–384 ). Home ranges analysed using CMR data. Seasonal variation home‐range size not found, but reproductive males “had larger than females...
The morphology of the inner ear in rheas was examined by light and electron microscopy. shape is typically bird-like with very long semicircular canals. anterior posterior cristae have small septa cruciata. vestibular sensory epithelia contain two main types hair cell innervation; bouton-innervated cells calyceal characterized a surrounding nerve calyx. utricular macula has single zone cells, while all other previously birds, except mute swan, 2 zones. height tallest hairs 20-30 microns. In...
Abstract Aspects of the population biology mudskipper, Pseudapocryptes elongatus , (Cuvier, 1816) were studied in Bac Lieu Province Lower Mekong Delta, Vietnam, including sex ratio, length–frequency distribution, sexual dimorphism, hepatosomatic index (HSI), female gonadosomatic (GSI), gonad histology, fecundity and some observations on post‐larvae juveniles. In ratio was skewed toward males. Females had a shorter mean length lower growth rate than No mature males or females observed among...
Sub-fossil remains of macrofauna extracted from a 5.3 m sediment core in the central part Limfjorden indicate marked changes salinity. Sub-fossils lower marine conditions similar to those present North Sea, while upper 2 represents periods brackish alternating with intermediate salinity condition, indicative opening and closure fjord west. Precise 14 C dating is hampered by variable reservoir effects addition old carbonate ground-water run-off. Salinity indications dinoflagellate cyst...
The aim of this study was to examine the burying behaviour hatchery-reared European flounder Platichthys flesus and turbot Psetta maxima, whether conditioning on a sandy substrate would improve efficiency. Both species buried shortly after release substrate. However, revealed interspecies differences; immediately release, while gradually. No significant difference in efficiency observed between naïve conditioned turbot. An effect size burial for both with tendency larger fish bury more...
Summary A population of Mastomys natalensis was studied by the catch‐mark‐release method from April 1983 to June 1984 in Morogoro, Tanzania. The observed cessation reproduction during dry season accompanied a reduction growth. Average growth rates decreased extent that larger individuals suffered considerable weight loss. relationship between individual and suggests resource limitation is sufficient explain break reproduction. Résumé On étudié une de par la méthode...
Information on levels of polycyclic aromatic compounds (PACs) in the marine environment from pristine areas world are still sparse. In this study, PACs were analyzed sediments and various organisms area Qeqertarsuaq/Disko western part Greenland. PAC measured sediments, blue mussels ( Mytilus edulis ), liver shorthorn sculpins Myoxocephalus scorpius blubber ringed seals Phoca hispida ). The average four sample types 359 w g/kg, 497 2762 101 g/kg dry weight respectively. Principal component...
<title>Abstract</title> It has been shown that mid-water column turbulence leads to elevated vertical nutrient flux at the shelf edge in northeastern North Sea. Here, we demonstrate phytoplankton communities this region tended be dominated by larger cells (estimated from percentage of chlorophyll captured on a 10 µm filter) than beyond edge. F<sub>v</sub>/F<sub>m</sub> (PSII electron transport capacity) corrected for photoinhibition surface layer correlated with large cells, suggesting...
Journal Article A New Record of Beamys from Tanzania Get access Jens T. Christensen Denmark-Tanzania Rodent Control Project, P.O. Box 3047, Morogoro, Search for other works by this author on: Oxford Academic Google Scholar Mammalogy, Volume 68, Issue 4, 27 November 1987, Page 858, https://doi.org/10.2307/1381565 Published: 1987 history Received: 26 August 1986 Accepted: 06
Information on levels of polycyclic aromatic compounds (PACs) in the marine environment from pristine areas world are still sparse. In this study, PACs were analyzed sediments and various organisms area Qeqertarsuaq/Disko western part Greenland. PAC measured sediments, blue mussels ( Mytilus edulis ), liver shorthorn sculpins Myoxocephalus scorpius blubber ringed seals Phoca hispida ). The average four sample types 359 w g/kg, 497 2762 101 g/kg dry weight respectively. Principal component...