Ivan S. Mettrop

Altenburg & Wymenga ecological research · Biodiversity & Landscape

In regions with intensive agriculture, water level fluctuation in wetlands has generally become constricted within narrow limits. Water authorities are, however, considering the re-establishment of fluctuating water levels as a management tool in biodiverse, base-rich fens ('rich fens'). This includes temporary inundation with surface water from di...

Vernatting vormt de basis voor ‘nature-based solutions’ in het veenweidegebied. In dit artikel worden koppelkansen en dilemma’s besproken tussen gewasproductie op natte veenbodems en andere ecosysteemdiensten, zoals klimaatmitigatie, klimaatadaptatie, biodiversiteit en zuivering van water en bodem.

Vleermuizen zijn in Amsterdam algemene stadsbewoners. Vooral de gewone dwergvleermuis komt erg veel voor. Er valt met de snelle ontwikkeling van onderzoeksmethoden en technieken nog veel te ontdekken over de nachtelijke activiteit van vleermuizen. Een jaarronde monitoring met een Batdetector, in eerste instantie door ons opgezet als een ‘hobby-proj...

Chemical characteristics of Dutch poor and rich fens and effects of atmospheric nitrogen deposition The vegetation composition of Dutch poor and rich fens of terrestrialization peatlands can be divided into six groups, from mesotrophic brownmoss dominated rich fens to acidic sphagnum moss dominated poor fens. The porewater bicarbonate concentratio...

Lang is gedacht dat aanvoer van zowel ijzerrijk als kalkrijk grondwater in veengebieden zou leiden tot een lage beschikbaarheid van fosfaat, wat goed is in tijden van hoge stikstofdepositie. Een studie in Nederlandse en Zweedse kalkmoerassen (H7230), trilvenen (H7140) en blauwgraslanden (H6410) laat echter zien dat de rol van ijzer en calcium niet...

Het huidige landgebruik en waterbeheer in het Friese veenweidegebied kent verschillende knelpunten. Voortdurende veenbodemdaling, CO2 -uitstoot, beperkte mogelijkheden voor waterberging en verlies van biodiversiteit vragen om adaptatie. Het koppelen van geïsoleerde polders aan het boezemstelsel kan leiden tot zowel een veerkrachtiger watersysteem a...

Aim To further unravel P availability in mineral-rich fens, and test whether high Fe in the soil would lead to low P availability to the vegetation. Methods Mesotrophic fens were selected over gradients in Ca and Fe in central Sweden and the Netherlands, to study characteristics of vegetation, pore water and peat soil, including inorganic and orga...

Brown moss-dominated rich fens are characterized by minerotrophic conditions, in which calcium (Ca) and iron (Fe) concentrations show large variations. We examined the relative importance of Ca and Fe in relation to the occurrence of three typical brown moss species: Scorpidium scorpioides, Scorpidium cossonii, and Hamatocaulis vernicosus. Peat che...

As a result of altered land use, water shortage and eutrophication, aquatic and semi-aquatic biodiversity in minerotrophic peatlands has severely declined in The Netherlands. After the improvement of surface water quality following hydrological and other measures, biodiversity is now increasing again in many reserves including former peat extractio...

Deterioration and restoration of minerotrophic waters in the Dutch peat landscape As a result of altered land use, water shortage and eu- trophication, aquatic and semi-aquatic biodiversi- ty in minerotrophic peatlands has severely declined in The Netherlands. After the improvement of surface water quality following hydrological and other meas- ur...

As a result of altered land use, water shortage and eutrophication, aquatic and semi-aquatic biodiversity in minerotrophic peatlands has severely declined in The Netherlands. After the improvement of surface water quality following hydrological and other measures, biodiversity is now increasing again in many reserves including former peat extractio...

The moss Calliergon megalophyllum is rediscovered in the Netherlands after approximately 50 years of absence, in a location different from before: National Park Weerribben-Wieden. This is a Natura 2000 wetland area, and a Dutch hotspot for rich-fen bryophytes. The species was growing in a fen pool. Plant species composition and water chemistry were...

QuestionWhat are the changes in mineral-rich fens (H7410A) after 25 yr of improved surface water quality in a national park?LocationStobbenribben floating-fen complex in National Park Weerribben-Wieden, the Netherlands.Methods Bryophyte species composition, peak above-ground biomass and vascular plant nutrients, as well as electrical conductivity o...

Few quantitative experimental studies have been carried out on the influence of subterranean termite activity on the water infiltration capacity of crusted soils in the semi-arid Sahelian region. These studies found increased infiltration rates on soils that were affected by foraging galleries of subterranean termites. In this paper, remarkable res...

Termites are important ecosystem-engineers in subtropical and tropical regions. The effect of termite activity affecting soil infiltration is well documented in the Sahelian region. Most studies find increased infiltration rates on surfaces that are affected by termite activity in comparison to crusted areas showing non-termite presence. Crusted ag...