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Rob Witbaard
Utrecht University
OceanographyEcologyArctica islandicaBenthic zoneBiology
50Publications
17H-index
739Citations
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Publications 49
Newest
#1Wytze K. Lenstra (UU: Utrecht University)H-Index: 1
#2Marie J M Séguret (UU: Utrecht University)H-Index: 5
Last. Caroline P. Slomp (UU: Utrecht University)H-Index: 46
view all 7 authors...
Abstract Manganese (Mn) is an essential micronutrient for phytoplankton and its cycling interacts with that of iron (Fe). Continental shelf sediments are a key but poorly quantified source of Mn to marine waters. In this study, we investigate Mn release from shelf sediments, its lateral transport (”shuttling”) in the oxic water column over the northwestern Black Sea shelf and its fate in the adjacent euxinic deep basin. We find a high release of Mn from organic-rich, bioirrigated coastal sedimen...
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#1Maxi CastrillejoH-Index: 5
#2Rob WitbaardH-Index: 17
Last. Marcus ChristlH-Index: 28
view all 7 authors...
Abstract Marine biogenic materials such as corals, shells, or seaweed have long been recognized as recorders of environmental conditions. Here, the bivalve Cerastoderma edule is used for the first time as a recorder of past seawater contamination with anthropogenic uranium, specifically 236U. Several studies have employed the authorized radioactive releases, including 236U, from nuclear reprocessing plants in La Hague, France, into the English Channel, and Sellafield, England, into the Irish Sea...
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#1Martijn Hermans (UU: Utrecht University)H-Index: 1
#2Wytze K. Lenstra (UU: Utrecht University)H-Index: 1
Last. Caroline P. Slomp (UU: Utrecht University)H-Index: 46
view all 8 authors...
Oxygen depletion in coastal waters may lead to release of toxic sulfide from sediments. Cable bacteria can limit sulfide release by promoting iron oxide formation in sediments. Currently, it is unknown how widespread this phenomenon is. Here, we assess the abundance, activity, and biogeochemical impact of cable bacteria at 12 Baltic Sea sites. Cable bacteria were mostly absent in sediments overlain by anoxic and sulfidic bottom waters, emphasizing their dependence on oxygen or nitrate as electro...
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#1Wytze K. Lenstra (UU: Utrecht University)H-Index: 1
#2Martijn Hermans (UU: Utrecht University)H-Index: 1
Last. Caroline P. Slomp (UU: Utrecht University)H-Index: 46
view all 13 authors...
Abstract Continental shelf sediments are a major source of iron (Fe) for phytoplankton in surface waters. In this study, we investigate the mechanisms that control release of Fe from shelf sediments and its lateral transport (“shuttling”) in oxic and hypoxic waters on the northwestern Black Sea shelf. We find that at two coastal stations near the outflow of the Danube river high input of organic matter drives strong reductive dissolution of Fe(oxyhydr)oxides (henceforth termed Fe oxides) in surf...
3 CitationsSource
#1Bryan A. Black (UA: University of Arizona)H-Index: 2
#2Carin Andersson (Bjerknes Centre for Climate Research)H-Index: 22
Last. Rob WitbaardH-Index: 17
view all 11 authors...
Over the past century, the dendrochronology technique of crossdating has been widely used to generate a global network of tree-ring chronologies that serves as a leading indicator of environmental ...
2 CitationsSource
#1Irene Ballesta-Artero (UU: Utrecht University)H-Index: 3
Last. Jaap van der Meer (UU: Utrecht University)H-Index: 27
view all 7 authors...
Abstract The ocean quahog Arctica islandica is the longest–living mollusk on Earth with a lifespan of at least 500 years. The slow senescence of this bivalve has promoted a great interest in its metabolic strategy. A dynamic energy budget (DEB) model was applied to describe how this species allocates its energy to maintenance, growth, maturation, and reproduction in a variable environment. We studied the relationship between A. islandica growth, lifespan, and food availability at eight different...
3 CitationsSource
#1Bryan A. BlackH-Index: 2
#2Carin AnderssonH-Index: 22
Last. Rob WitbaardH-Index: 17
view all 11 authors...
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#1Irene Ballesta-Artero (UU: Utrecht University)H-Index: 3
#2Liqiang ZhaoH-Index: 6
Last. Rob Witbaard (UU: Utrecht University)H-Index: 17
view all 7 authors...
Abstract Long-term and high-resolution environmental proxy data are crucial to contextualize current climate change. The extremely long-lived bivalve, Arctica islandica, is one of the most widely used paleoclimate archives of the northern Atlantic because of its fine temporal resolution. However, the interpretation of environmental histories from microstructures and elemental impurities of A. islandica shells is still a challenge. Vital effects (metabolic rate, ontogenetic age, and growth rate) ...
3 CitationsSource
#1Irene Ballesta-Artero (UU: Utrecht University)H-Index: 3
#2Reneé Janssen (Bosch)H-Index: 1
Last. Rob Witbaard (UU: Utrecht University)H-Index: 17
view all 4 authors...
The interest in Arctica islandica growth biology has recently increased due to the widespread use of its shell as a bioarchive. Although temperature and food availability are considered key factors in its growth, their combined influence has not been studied so far under laboratory conditions. We tested the interactive effect of temperature and food availability on the shell and tissue growth of A. islandica juveniles (9–15 mm in height) in a multi-factorial experiment with four food levels (no ...
4 CitationsSource
#1Rob Witbaard (UU: Utrecht University)H-Index: 17
#2M.J.N. Bergman (UU: Utrecht University)H-Index: 16
Last. Gerard C.A. Duineveld (UU: Utrecht University)H-Index: 9
view all 4 authors...
Abstract This paper describes the distribution of the razor clam Ensis directus in the Dutch coastal zone with emphasis on its relation to sediment grainsize, in particular silt. The study includes a spatial survey along the coast of North Holland (Netherlands) and an in-situ experiment for the burial of silt. Densities of E. directus appeared highest close to the coast in the siltiest sediment, where also the highest body mass index values (BMI) were found suggesting the best conditions for gro...
2 CitationsSource
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