A5007061227- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Ocean Acidification Effects and Responses
- Marine and environmental studies
- Aquaculture Nutrition and Growth
- Food Industry and Aquatic Biology
- Physiological and biochemical adaptations
- Reproductive biology and impacts on aquatic species
- Marine and coastal plant biology
- Cephalopods and Marine Biology
- Coastal and Marine Management
- Fatty Acid Research and Health
University of Bremen
2013-2023
The northern Humboldt Current upwelling system (HCS) belongs to the most productive marine ecosystems, providing five eight times higher fisheries landings per unit area than other coastal systems. To solve this “Peruvian puzzle”, elucidate pelagic food-web structure and better understand trophic interactions in HCS, a combined stable isotope fatty acid biomarker approach was adopted for key zooplankton taxa positions with an extensive spatial coverage from 8.5 16°S vertical range down 1,000...
Oxygen minimum zones (OMZs) affect distribution patterns, community structure and metabolic processes of marine organisms. Due to the prominent role zooplankton, especially copepods, in carbon cycle predicted intensification expansion OMZs, it is essential understand effects hypoxia on zooplankton ecophysiology. For this study, calanoid copepods were sampled from different depths (0–1800 m) at eight stations eastern tropical Atlantic (3°47′N 18°S) during three expeditions 2010 2011. Their...
Copepods play central roles in pelagic food webs linking primary production to higher trophic levels. Biomarkers (lipids, stable isotopes) provide modern approaches study dietary preferences and interactions. A cluster analysis based on the fatty acid (FA) alcohol compositions of calanoid copepods (copepodids C4/C5 adult stages) from southeastern tropical Atlantic identified five distinct groups according lipid composition storage strategy, coinciding with differences vertical distribution...
The northern Benguela Upwelling System (nBUS) has been facing increasing temperatures and decreasing dissolved oxygen (DO) levels over the last decades. This implications for key processes trophic interactions within ecosystem including shifts in community composition, distribution ranges, levels, changes energy flows migration patterns with feedbacks to biogeochemical processes. Here we summarise results gained from GENUS project (Geochemistry Ecology of Namibian System) focussing on...
Abstract. The Humboldt Current Upwelling System (HCS) is the most productive eastern boundary upwelling system (EBUS) in terms of fishery yield on planet. EBUSs are considered hotspots climate change with predicted expansion mesopelagic oxygen minimum zones (OMZs) and related changes frequency intensity nutrient-rich, low-oxygen deep water. To increase our mechanistic understanding how impacts plankton communities trophic links, we investigated mesozooplankton community succession gut...
Abstract Early life history (ELH) traits are key to understand variable recruitment success and hence the stock size of marine fish. One currently most puzzling ecosystems in this regard is northern part Benguela Current upwelling system off Namibia. Here, populations formerly dominant pelagic species, sardine anchovy, failed recover during last three decades after a dramatic decline. In contrast, Cape horse mackerel, Trachurus capensis, maintained constant population size. Warming shoaling...
Life strategies, ecophysiological performances and diel vertical migration (DVM) of zooplankton key species affect the efficiency strength biological carbon pump (BCP). However, it is unclear to what extent different functional groups BCP. Depth-stratified day night samples (0-800 m) from subtropical South Atlantic were analyzed focusing on calanoid copepod community. Calanoid abundance, biomass distribution species-specific impact passive (fecal pellets) active (via DVM) flux determined....
Abstract Small copepod genera play an important role in marine food webs and biogeochemical fluxes but have been neglected many studies. This is the first study determining biomass, carbon consumption egestion rates of small- (<1 mm prosome length, PL), medium- (1–1.5 PL) large-sized (>2 copepods along a cross-shelf transect southern Benguela upwelling system. Calanoids contributed on average 55 ± 19% to total abundance 82 13% biomass. Small-sized Oithona spp. (114–119 mg C m−2...
Abundance, biomass and respiration rates of dominant medium- to larger-sized copepod species (ML class) from the upwelling system off Peru (8.5-16°S) were determined along with their carbon ingestion egestion rates. Small copepods (S included for comparisons community Overall, abundance/biomass was highest in upper 50 m decreased depth thus also egestion. Ingestion ML class (0-50 m) shelf regions (14-515 mg C -2 d -1 ) lower south compared north central study areas, while offshore (11-502...
The Humboldt Upwelling System (HUS) supports high levels of primary production and has the largest single-stock fishery worldwide. fish is suggested to be related trophic transfer efficiency in HUS. Mucous-mesh grazers (pelagic tunicates gastropods) are mostly low nutritious value might reduce when they locally abundant. Unfortunately, little known about spatial dynamics mucous-mesh from Peruvian waters, limiting our understanding their potential ecological role(s). We provide a assessment...