Search results for: Koen Martens

Items from 1 to 20 out of 102 results

article

A moderate differential effect of organic and conventional agriculture across taxonomic groups inhabiting farmland ponds

Rafaela A. Almeida, Pieter Lemmens, Marie Cours, Luc Denys, more

Organic agriculture is increasingly promoted as a more environmentally friendly alternative to conventional agriculture, as it restricts the use of fertilisers and synthetic pesticides. However, the impact of both farming systems on aquatic biodiversity is strongly debated. Ponds are abundant in agricultural landscapes and strongly contribute to biodiversity. They also respond strongly to land...

article

Species' traits and taxonomic distance can predict the hatching phenology of ostracod (Crustacea) resting eggs from tropical floodplain lakes

Jonathan Rosa, Danielle K. Petsch, Koen Martens, Janet Higuti, more

International Review of Hydrobiology > 106 > 5-6 > 226 - 238

Freshwater ostracods are commonly found in temporary ponds and lakes, surviving drought periods by producing resting eggs. We investigated the hatching phenology of ostracod resting eggs from the sediments of temporary floodplain lakes, considering both the taxonomic distance between species and their functional traits, such as carapace size (length and height) and shape, valve ornamentation, and...

article

The representativeness of protected areas for Amazonian fish diversity under climate change

Renata G. Frederico, Murilo S. Dias, Céline Jézéquel, Pablo A. Tedesco, more

Aquatic Conservation: Marine and Freshwater Ecosystems > 31 > 5 > 1158 - 1166

The Amazon basin has been subjected to extreme climatic events and according to climate change projections this hydrosystem could face changes in the natural dynamic of flood cycles that support the feeding and reproduction of many fish species, threatening aquatic biodiversity. Protected areas (PAs) are the main tools used to safeguard the biodiversity in the long term; however, they are fixed...

article

Scale‐dependent patterns of metacommunity structuring in aquatic organisms across floodplain systems

Fernando M. Lansac‐Tôha, Luis M. Bini, Jani Heino, Bianca R. Meira, more

Journal of Biogeography > 48 > 4 > 872 - 885

Aim Evaluating how groups of organisms vary in dispersal capability and how environmental, spatial and temporal signals vary across multiple scales is critical to elucidating metacommunity theory. We examined whether the relative contributions of environmental, spatial and hydrological factors have different effects on organismal groups with different dispersal abilities at three spatial scales,...

article

Freshwater fish diversity hotspots for conservation priorities in the Amazon Basin

Céline Jézéquel, Pablo A. Tedesco, William Darwall, Murilo S. Dias, more

Conservation Biology > 34 > 4 > 956 - 965

Conserving freshwater habitats and their biodiversity in the Amazon Basin is a growing challenge in the face of rapid anthropogenic changes. We used the most comprehensive fish‐occurrence database available (2355 valid species; 21,248 sampling points) and 3 ecological criteria (irreplaceability, representativeness, and vulnerability) to identify biodiversity hotspots based on 6 conservation templates...

article

Urbanization drives cross‐taxon declines in abundance and diversity at multiple spatial scales

Elena Piano, Caroline Souffreau, Thomas Merckx, Lisa F. Baardsen, more

Global Change Biology > 26 > 3 > 1196 - 1211

The increasing urbanization process is hypothesized to drastically alter (semi‐)natural environments with a concomitant major decline in species abundance and diversity. Yet, studies on this effect of urbanization, and the spatial scale at which it acts, are at present inconclusive due to the large heterogeneity in taxonomic groups and spatial scales at which this relationship has been investigated...

article

Karl Edward Havens (1957–2019)

Erik Jeppesen, Charles F. Sidman, Gaohua Ji, Koen Martens

Hydrobiologia > 2019 > 842 > 1 > 1-3

article

The Freshwater Information Platform: a global online network providing data, tools and resources for science and policy support

Astrid Schmidt-Kloiber, Vanessa Bremerich, Aaike Wever, Sonja C. Jähnig, more

Hydrobiologia > 2019 > 838 > 1 > 1-11

Freshwaters are among the most complex, dynamic, and diverse ecosystems globally. Despite their small share of the earth’s surface (less than 1%) they are home to over 10% of all known animal species. Biodiversity decrease in general and freshwater biodiversity decline in particular have recently received increasing attention, and various policy instruments are now targeting the conservation, protection...

article

Extreme drought periods can change spatial effects on periphytic ostracod metacommunities in river-floodplain ecosystems

Ramiro Campos, Eliezer de Oliveira da Conceição, Koen Martens, Janet Higuti

Hydrobiologia > 2019 > 828 > 1 > 369-381

Hydrological regimes are seasonally variable in river-floodplain ecosystems. Thus, since in these environments the local and regional factors change at different temporal scales, factors structuring metacommunities might also differ over time. However, temporal dynamics of metacommunities have rarely been assessed. Here, we investigated the influence of environmental and spatial factors over time...

article

Factors affecting the metacommunity structure of periphytic ostracods (Crustacea, Ostracoda): a deconstruction approach based on biological traits

Ramiro Campos, Fernando Miranda Lansac-Tôha, Eliezer de Oliveira Conceição, Koen Martens, more

Aquatic Sciences > 2018 > 80 > 2 > 1-12

Metacommunity studies using the deconstruction approach based on biological traits have received a great deal of attention in recent years as they often better describe characteristics of the species that reflect adaptations to a specific environment. This approach has not yet been used for ostracods, which are nevertheless highly diverse crustaceans and abundant in continental aquatic environments...

article

Happy birthday Hydrobiologia! 70 years young and still growing…

Diego Fontaneto, Sidinei Magela Thomaz, Luigi Naselli-Flores, Koen Martens

Hydrobiologia > 2018 > 809 > 1 > 1-3

Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-017-3476-9) contains supplementary material, which is available to authorized users.

article

Effects of flood pulses on persistence and variability of pleuston communities in a tropical floodplain lake

Eliezer de Oliveira da Conceição, Janet Higuti, Ramiro de Campos, Koen Martens

Hydrobiologia > 2018 > 807 > 1 > 175-188

Large rivers in tropical regions can experience strong variations of abiotic factors owing to the occurrence of flood pulses. Both man-made and natural floods can cause pulses with varying intensity and duration. Here, we test the hypothesis that ostracod communities in the pleuston of floating plants are persistent during regular pulses and more variable during extreme floods. Ostracod communities...

article

Preface: Emerging trends in aquatic ecology II

Luigi Naselli-Flores, Koen Martens, Diego Fontaneto, Sidinei Magela Thomaz

Hydrobiologia > 2017 > 800 > 1 > 1-5

Guest editors: Koen Martens, Sidinei M. Thomaz, Diego Fontaneto & Luigi Naselli-Flores / Emerging Trends in Aquatic Ecology II

article

Cryptic diversity and speciation in endemic Cytherissa (Ostracoda, Crustacea) from Lake Baikal

Isa Schön, Valentina Pieri, Dimtry Yu Sherbakov, Koen Martens

Hydrobiologia > 2017 > 800 > 1 > 61-79

Lake Baikal (Siberia) is the most ancient and deepest of all ancient lakes on Earth. It holds a (mostly endemic) diversity of thousands of animal species, including a speciose radiation of ostracods of the genus Cytherissa. Applying molecular tools to this crustacean group reveals that several morphological species are actually species clusters. Based on combined 16S and 28S DNA sequence data from...

article

Multiple oscillations during the Lateglacial as recorded in a multi-proxy, high-resolution record of the Moervaart palaeolake (NW Belgium)

Johanna A.A. Bos, Philippe De Smedt, Hendrik Demiddele, Wim Z. Hoek, more

Quaternary Science Reviews > 2017 > 162 > C > 26-41

This paper presents the results of multi-disciplinary research carried out on the deposits of Moervaart depression, NW Belgium, one of the largest palaeolakes (∼25 km²) that existed during the Lateglacial interstadial in NW Europe. The multi-proxy study, including physical (organic matter and calcium carbonate, magnetic susceptibility, micromorphological), botanical (pollen, macrofossils, diatoms),...

article

A New Quality Metric for III–V/High-k MOS Gate Stacks Based on the Frequency Dispersion of Accumulation Capacitance and the CET

Abhitosh Vais, Jacopo Franco, Koen Martens, Dennis Lin, more

IEEE Electron Device Letters > 2017 > 38 > 3 > 318 - 321

This letter proposes a metric to assess the quality of high-k dielectrics on III–V substrates and a benchmarking methodology for the gate stack qualification in the region of MOS device operation above threshold voltage,

${V}_{t}$

. The metric is based on a capacitive equivalent thickness (CET) - normalized frequency dispersion (

$\text{D}_{\mathrm {eff}}$

) evaluated in the accumulation region of...

article

Evaluation of quantitative sampling methods in pleuston: An example from ostracod communities

Ramiro de Campos, Eliezer de Oliveira da Conceição, Márian Bozzo de Oliveira Pinto, Ana Paula dos Santos Bertoncin, more

Limnologica - Ecology and Management of Inland Waters > 2017 > 63 > C > 36-41

We address two methodological questions related to sampling pleuston in floodplain lakes, using ostracod as model group: (1) we test the homogeneity of ostracod communities by comparing samples from the edge and from the centre of the floating Eichhornia crassipes patches, (2) we test if there is a clear difference between two methods of sampling. According to the ecological attributes evaluated,...

article

An Analytical Model of MOS Admittance for Border Trap Density Extraction in High- $k$ Dielectrics of III–V MOS Devices

Abhitosh Vais, Koen Martens, Dennis Lin, Anda Mocuta, more

IEEE Transactions on Electron Devices > 2016 > 63 > 12 > 4707 - 4713

In this paper, we have developed a straightforward MOS admittance-based technique for defect density extraction, utilizing analytical equations for MOS capacitors with border traps (BTs). We show that these equations can provide an efficient technique to obtain the BT density directly from the measured data without any requirement of numerically involved techniques. This is demonstrated by applying...

book

Lost Sex

Isa Schö, Koen Martens, Peter Dijk, Springer Netherlands

Sex is the queen of problems in evolutionary biology. Generations of researchers have investigated one of the last remaining evolutionary paradoxes: why sex exists at all. Given that sexual reproduction is costly from an evolutionary point of view, one could wonder why not all animals and plants reproduce asexually. Dozens of contemporary hypotheses attempt to explain the prevalence of sex and its...

article

Ostracod (Ostracoda, Crustacea) genomics — Promises and challenges

Isa Schön, Koen Martens

Marine Genomics > 2016 > 29 > C > 19-25

Ostracods are well-suited model organisms for evolutionary research. Classic genetic techniques have mostly been used for phylogenetic studies on Ostracoda and were somewhat affected by the lack of large numbers of suitable markers. Genomic methods with their huge potential have so far rarely been applied to this group of crustaceans. We provide relevant examples of genomic studies on other organisms...

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INFONA - science communication portal

Search results for: Koen Martens

A moderate differential effect of organic and conventional agriculture across taxonomic groups inhabiting farmland ponds

Species' traits and taxonomic distance can predict the hatching phenology of ostracod (Crustacea) resting eggs from tropical floodplain lakes

The representativeness of protected areas for Amazonian fish diversity under climate change

Scale‐dependent patterns of metacommunity structuring in aquatic organisms across floodplain systems

Freshwater fish diversity hotspots for conservation priorities in the Amazon Basin

Urbanization drives cross‐taxon declines in abundance and diversity at multiple spatial scales

Karl Edward Havens (1957–2019)

The Freshwater Information Platform: a global online network providing data, tools and resources for science and policy support

Extreme drought periods can change spatial effects on periphytic ostracod metacommunities in river-floodplain ecosystems

Factors affecting the metacommunity structure of periphytic ostracods (Crustacea, Ostracoda): a deconstruction approach based on biological traits

Happy birthday Hydrobiologia! 70 years young and still growing…

Effects of flood pulses on persistence and variability of pleuston communities in a tropical floodplain lake

Preface: Emerging trends in aquatic ecology II

Cryptic diversity and speciation in endemic Cytherissa (Ostracoda, Crustacea) from Lake Baikal

Multiple oscillations during the Lateglacial as recorded in a multi-proxy, high-resolution record of the Moervaart palaeolake (NW Belgium)

A New Quality Metric for III–V/High-k MOS Gate Stacks Based on the Frequency Dispersion of Accumulation Capacitance and the CET

Evaluation of quantitative sampling methods in pleuston: An example from ostracod communities

An Analytical Model of MOS Admittance for Border Trap Density Extraction in High- $k$ Dielectrics of III–V MOS Devices

Lost Sex

Ostracod (Ostracoda, Crustacea) genomics — Promises and challenges

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