The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Juan Martínez-sánchez - One of the best experts on this subject based on the ideXlab platform.
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Litter and soil arthropods diversity and density in a tropical dry forest ecosystem in Western Mexico
Biodiversity and Conservation, 2007Co-Authors: José G. Palacios-vargas, Gabriela Castaño-meneses, J. A. Gómez-anaya, A. Martínez-yrizar, B. E. Mejía-recamier, Juan Martínez-sánchezAbstract:The composition and temporal changes of edaphic microarthropods in both litter layer and soil were analyzed in a tropical dry forest ecosystem in Western Mexico. Sampling was carried out from June 1991 to July 1992 in two small watersheds at the Chamela Biological Station (Jalisco State, Mexico). At each watershed 10 random cores samples, 11 cm in diameter and 5 cm depth, were taken monthly from each biotope from an area of 100 m^2. Fauna was extracted by Berlese-Tullgren funnels and preserved in 75% ethanol. The total abundance of arthropods was 96,338 specimens, belonging to 33 taxa. Numerically dominant groups were Prostigmata, Cryptostigmata, Collembola and Mesostigmata, which constituted 92.6% of the total abundance. The effect of current monthly precipitation and temperature on density of total Arthropoda and different Orders was also investigated. Precipitation and temperature were significantly correlated with Collembola and Mesostigmata densities and also with total arthropod. The seasonal variation in the amount of litterfall was also significantly related to the abundance of arthropod in the litter layer biotope.
Bodil K Ehlers - One of the best experts on this subject based on the ideXlab platform.
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soil microarthropods are only weakly impacted after 13 years of repeated drought treatment in wet and dry heathland soils
Soil Biology & Biochemistry, 2013Co-Authors: Martin Holmstrup, Jesper Givskov Sorensen, Inger Kappel Schmidt, Pia L Nielsen, Sharon Mason, A Tietema, Andrew R Smith, Thomas Bataillon, Claus Beier, Bodil K EhlersAbstract:Studies of biological responses in the terrestrial environment to rapid changes in climate have mostly been concerned with aboveground biota, whereas less is known of belowground organisms. The present study focuses on mites and springtails of heathland ecosystems and how the microarthropod community has responded to simulated climate change in a long-term field experiment. Increased temperature and repeated drought was applied for 13 years to field plots located in Wales, The Netherlands and Denmark representing sites of contrasting climatic conditions with respect to precipitation and temperature. This approach provided an opportunity to study biological responses on a local (within sites) and regional scale. Warming treatments increasing night time temperature (0.3–1 °C higher than ambient at 5 cm soil depth) had no detectable effects on the microarthropod communities. Increased intensity and frequency of drought had only weak persistent effects on springtail species composition, but practically no effect on major mite groups (Oribatida, Prostigmata or Mesostigmata) suggesting that ecosystem functions of microarthropods may only be transiently impacted by repeated spring or summer drought.
Pavel B Klimov - One of the best experts on this subject based on the ideXlab platform.
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origin and higher level diversification of acariform mites evidence from nuclear ribosomal genes extensive taxon sampling and secondary structure alignment
BMC Evolutionary Biology, 2015Co-Authors: Almir R Pepato, Pavel B KlimovAbstract:Background Acariformes is the most species-rich and morphologically diverse radiation of chelicerate arthropods, known from the oldest terrestrial ecosystems. It is also a key lineage in understanding the evolution of this group, with the most vexing question whether mites, or Acari (Parasitiformes and Acariformes) is monophyletic. Previous molecular studies recovered Acari either as monophyletic or non-monophyletic, albeit with a limited taxon sampling. Similarly, relationships between basal acariform groups (include little-known, deep-soil 'endeostigmatan' mites) and major lineages of Acariformes (Sarcoptiformes, Prostigmata) are virtually unknown. We infer phylogeny of chelicerate arthropods, using a large and representative dataset, comprising all main in- and outgroups (228 taxa). Basal diversity of Acariformes is particularly well sampled. With this dataset, we conduct a series of phylogenetically explicit tests of chelicerate and acariform relationships and present a phylogenetic framework for internal relationships of acariform mites.
Stef Bokhorst - One of the best experts on this subject based on the ideXlab platform.
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extreme winter warming events more negatively impact small rather than large soil fauna shift in community composition explained by traits not taxa
Global Change Biology, 2012Co-Authors: Stef Bokhorst, Gareth K Phoenix, Jarle W Bjerke, Terry V Callaghan, F Huyerbrugman, Matty P BergAbstract:Extreme weather events can have negative impacts on species survival and community structure when surpassing lethal thresholds. Extreme winter warming events in the Arctic rapidly melt snow and expose ecosystems to unseasonably warm air (2–10 °C for 2–14 days), but returning to cold winter climate exposes the ecosystem to lower temperatures by the loss of insulating snow. Soil animals, which play an integral part in soil processes, may be very susceptible to such events depending on the intensity of soil warming and low temperatures following these events. We simulated week-long extreme winter warming events – using infrared heating lamps, alone or with soil warming cables – for two consecutive years in a sub-Arctic dwarf shrub heathland. Minimum temperatures were lower and freeze-thaw cycles were 2–11 times more frequent in treatment plots compared with control plots. Following the second event, Acari populations decreased by 39%; primarily driven by declines of Prostigmata (69%) and the Mesostigmatic nymphs (74%). A community-weighted vertical stratification shift occurred from smaller soil dwelling (eu-edaphic) Collembola species dominance to larger litter dwelling (hemi-edaphic) species dominance in the canopy-with-soil warming plots compared with controls. The most susceptible groups to these winter warming events were the smallest individuals (Prostigmata and eu-edaphic Collembola). This was not apparent from abundance data at the Collembola taxon level, indicating that life forms and species traits play a major role in community assembly following extreme events. The observed shift in soil community can cascade down to the micro-flora affecting plant productivity and mineralization rates. Short-term extreme weather events have the potential to shift community composition through trait composition with potentially large consequences for ecosystem development.
José G. Palacios-vargas - One of the best experts on this subject based on the ideXlab platform.
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Litter and soil arthropods diversity and density in a tropical dry forest ecosystem in Western Mexico
Biodiversity and Conservation, 2007Co-Authors: José G. Palacios-vargas, Gabriela Castaño-meneses, J. A. Gómez-anaya, A. Martínez-yrizar, B. E. Mejía-recamier, Juan Martínez-sánchezAbstract:The composition and temporal changes of edaphic microarthropods in both litter layer and soil were analyzed in a tropical dry forest ecosystem in Western Mexico. Sampling was carried out from June 1991 to July 1992 in two small watersheds at the Chamela Biological Station (Jalisco State, Mexico). At each watershed 10 random cores samples, 11 cm in diameter and 5 cm depth, were taken monthly from each biotope from an area of 100 m^2. Fauna was extracted by Berlese-Tullgren funnels and preserved in 75% ethanol. The total abundance of arthropods was 96,338 specimens, belonging to 33 taxa. Numerically dominant groups were Prostigmata, Cryptostigmata, Collembola and Mesostigmata, which constituted 92.6% of the total abundance. The effect of current monthly precipitation and temperature on density of total Arthropoda and different Orders was also investigated. Precipitation and temperature were significantly correlated with Collembola and Mesostigmata densities and also with total arthropod. The seasonal variation in the amount of litterfall was also significantly related to the abundance of arthropod in the litter layer biotope.
