Valentyna Krashevska

Valentyna Krashevska
Georg-August-Universität Göttingen | GAUG · Department of Animal Ecology

Dr.

About

94
Publications
34,805
Reads
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2,364
Citations
Citations since 2016
67 Research Items
2223 Citations
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
Additional affiliations
January 2009 - present
Georg-August-Universität Göttingen
Position
  • PostDoc Position
May 2005 - December 2008
Technische Universität Darmstadt
Position
  • PhD Student

Publications

Publications (94)
Article
Full-text available
Global change is affecting soil biodiversity and functioning across all terrestrial ecosystems. Still, much is unknown about how soil biodiversity and function will change in the future in response to simultaneous alterations in climate and land use, as well as other environmental drivers. It is crucial to understand the direct, indirect and intera...
Article
Full-text available
Deforestation and agricultural expansion in the tropics affect local and regional climatic conditions, leading to synergistic negative impacts on land ecosystems. Climatic changes manifest in increased inter‐ and intraseasonal variations and frequency of extreme climatic events (i.e., droughts and floods), which have evident consequences for aboveg...
Article
Full-text available
Background Crop-tree thinning (CTT) is a forest management practice aiming at enhancing the growth of target trees in plantations by harvesting neighboring trees. Along with the positive effect on tree growth, thinning represents a disturbance, which likely affects belowground organisms and may feed back to stand productivity. However, the impact o...
Article
Full-text available
Agricultural expansion is among the main threats to biodiversity and functions of tropical ecosystems. It has been shown that conversion of rainforest into plantations erodes biodiversity, but further consequences for food-web structure and energetics of belowground communities remains little explored. We used a unique combination of stable isotope...
Preprint
Full-text available
Agricultural expansion is among the main threats to biodiversity and functions of tropical ecosystems. Conversion of rainforest into plantations erodes biodiversity with little-explored consequences for food-web structure and energetics of belowground communities, and associated ecosystem functions and services. We used a unique combination of appr...
Article
Full-text available
Rainforest conversion and expansion of plantations in tropical regions are associated with changes in animal communities and biodiversity decline. In soil, Collembola are one of the most numerous invertebrate groups that affect the functioning of microbial communities and support arthropod predators. Despite that, information on the impact of chang...
Article
Full-text available
In tropical forest ecosystems leaf litter from a large variety of species enters the de-composer system, however, the impact of leaf litter diversity on the abundance and activity of soil organisms during decomposition is little known. We investigated the effect of leaf litter diversity and identity on microbial functions and the abundance of micro...
Article
Full-text available
Soils host most biodiversity on Earth, with a major fraction of its taxonomic diversity still to be uncovered and most of its functional knowledge to be determined. Much focus has been - and still is - on bacteria, fungi and animals. Clearly, without any of those components, soils would not function as they do. However, the group that constitutes t...
Article
Full-text available
This review provides a synthesis of current knowledge on the morphological and functional traits of testate amoebae, a polyphyletic group of protists commonly used as proxies of past hydrological changes in paleoecological investigations from peatland, lake sediment and soil archives. A trait-based approach to understanding testate amoebae ecology...
Article
Full-text available
Tropical peatlands play an important role in carbon storage and in water regulation on a landscape level. However, our understanding of their ecology and long-term hydrological dynamics remains limited. Transfer functions, constructed on the basis of biological indicators (proxies) with known ecological preferences, allow us to infer past environme...
Article
Full-text available
Deforestation and land-use change in tropical regions result in habitat loss and extinction of species that are unable to adapt. The effects of tropical land-use change on ground spiders, a major group of invertebrate predators, are poorly known. With two methods, we showed >50% decline in spider density, species richness, functional diversity, and...
Article
Full-text available
As the most abundant animals on earth, nematodes are a dominant component of the soil community. They play critical roles in regulating biogeochemical cycles and vegetation dynamics within and across landscapes and are an indicator of soil biological activity. Here, we present a comprehensive global dataset of soil nematode abundance and functional...
Article
Full-text available
Land-use transitions can enhance the livelihoods of smallholder farmers but potential economic-ecological trade-offs remain poorly understood. Here, we present an interdisciplinary study of the environmental, social and economic consequences of land-use transitions in a tropical smallholder landscape on Sumatra, Indonesia. We find widespread biodiv...
Article
Full-text available
Oil palm plantations are expanding rapidly throughout Southeast Asia due to increasing global food demand, thereby putting greater pressure on local ecosystems. These plantations usually replace rainforests, resulting in major losses of soil structure and fertility, and belowground biodiversity. However, despite causing soil degradation, oil palms...
Chapter
This chapter provides identification keys to free-living ciliates, amebida, and flagellated protozoa. Special detail is included for Ciliophora and Amoebida. Also, information on preparation methods, definition of the most relevant morphological terms, and current limitations in our knowledge of the group are provided. Additional information on the...
Chapter
The diversity of naked amoebae and testate amoebae that inhabit the lentic and lotic ecosystems of the Neotropical region (from central Mexico and the Caribbean Islands, to the tip of South America) is discussed
Article
Full-text available
Focusing on nematodes and their well-developed indices of community, ecosystem structure and function, we investigated the effects of the conversion of rainforest into rubber and oil palm plantations in Sumatra, Indonesia. Land use did not affect the total abundance of litter- and soil-dwelling nematodes, neither in riparian nor in well-drained sit...
Article
Full-text available
Deforestation and land‐use change in tropical regions result in habitat loss and extinction of species that are unable to adapt to the conditions in agricultural landscapes. If the associated loss of functional diversity is not compensated by species colonizing the converted habitats, extinctions might be followed by a reduction or loss of ecosyste...
Article
Full-text available
Oil palm plantations are intensively managed agricultural systems that increasingly dominate certain tropical regions. Oil palm monocultures have been criticized because of their reduced biodiversity compared to the forests they historically replaced, and because of their negative impact on soils, water, and climate. We experimentally test whether...
Article
Full-text available
Soil organisms are a crucial part of the terrestrial biosphere. Despite their importance for ecosystem functioning, few quantitative, spatially explicit models of the active belowground community currently exist. In particular, nematodes are the most abundant animals on Earth, filling all trophic levels in the soil food web. Here we use 6,759 geore...
Article
Full-text available
Protists, abundant but enigmatic single-celled eukaryotes, are important soil microbiota providing numerous ecosystem functions. We employed high-throughput sequencing of environmental DNA, targeting the V4 region of the 18S rRNA gene, to characterize changes in their abundance, species richness, and community structure with conversion of lowland r...
Article
Microarthropods impact organic matter turnover and nutrient cycling via processing of organic matter entering the soil as litter and root exudates. Variations in the structure of soil microarthropod communities are due to both biotic and abiotic factors such as local climatic conditions and litter quality. However, in particular in tropical ecosyst...
Article
Full-text available
Land-use intensification in the tropics plays an important role in meeting global demand for agricultural commodities but generates high environmental costs. Here, we synthesize the impacts of rainforest conversion to tree plantations of increasing management intensity on carbon stocks and dynamics. Rainforests in Sumatra converted to jungle rubber...
Article
Full-text available
We investigated how the land-use change from rainforest into jungle rubber, intensive rubber and oil palm plantations affects decomposers and litter decomposition in Sumatra, Indonesia. Litterbags containing three litter types were placed into four land-use systems and harvested after 6 and 12 months. Litter mass loss and litter element concentrati...
Article
Protists include all eukaryotes except plants, fungi and animals. They are an essential, yet often forgotten, component of the soil microbiome. Method developments have now furthered our understanding of the real taxonomic and functional diversity of soil protists. They occupy key roles in microbial foodwebs as consumers of bacteria, fungi and othe...
Article
Full-text available
We investigated the role of leaf litter chemistry and richness in affecting testate amoeba communities of tropical rainforest in the Ecuadorian Andes. Litterbags containing leaf litter from four dominating tree species (Clusia sp., Myrcia pubescens, Graffenrieda emarginata, and Cecropia andina) with richness 1, 2, and 4 species were established and...
Article
Full-text available
Conversion of tropical rainforests into plantations fundamentally alters ecological niches of animal species. Generalist predators such as centipedes (Chilopoda) may be able to persist in converted ecosystems due to their ability to adapt and switch to alternative prey populations. We investigated variations in community composition and trophic nic...
Data
Regression coefficients and coefficient of determination (R2) of body size—dry weight relationships in two centipede groups of different body shape. N, number of replicates; L, body length; W, body width. Regression coefficients apply to the relation y = a(x)b, where y is dry weight (mg) and x is body length (L), body length times body width (L x W...
Data
Summary table from Canonical Correspondence Analysis (CCA) investigating environmental variables structuring centipede communities. Explanatory variables (S4 Table) account for 33.4% of the variation, adjusted explained variation is 13.1%. Permutation Test results: Axis 1 pseudo-F = 3.5, p = 0.108; Fall axes pseudo-F = 1.6, p = 0.03. (DOCX)
Data
List of centipede species including full taxonomic name and authority, family affiliation, number of replicates (stable isotope ratios) and mean δ13C and δ15N values (± SD). Abbr., abbreviation used in figures. (DOCX)
Data
Stable isotope values of litter material sampled in different conversion systems. Number of replicates and mean δ13C and δ15N values (± SD). (DOCX)
Data
ANOVA results from generalized linear mixed effects models testing the effect of forest conversion on abundance, biomass and species richness of centipedes. Results are given for “intensity” models testing if conversion effects follow a linear trend from rainforest (F) to jungle rubber (J) to rubber (R) to oil palm plantations (O). Additionally, re...
Data
Term effects of Canonical Correspondence Analysis (CCA) investigating correlations between abundances of centipede species and environmental variables. (DOCX)
Data
Discriminant function analysis of centipede (Chilopoda) species in rainforests (F), jungle rubber (J), rubber (R) and oil palm (O). Range ellipses for the discriminants are given at the 95% confidence level. (DOCX)
Data
Abundances (ind./m2) of centipede species on research plots representing four different rainforest conversion systems in two study regions. (DOCX)
Data
Relationship of body cross sectional area (length x width) to dry weight in two centipede groups of different body shape. (a) Geophilomorpha, (b) Cryptopidae and Henicopidae. Data were log-transformed to reduce heteroscedasticity and to linearize the size-weight relationship. Regression equations are additionally given back transformed to the power...
Data
Species accumulation curve showing the increase of centipede (Chilopoda) species with number of study sites. Means (' SD) based on 100 permutations. Dashed blue lines indicate bootstrap, first order jackknife and Chao extrapolations of the species pool in the study region [46]. (DOCX)
Article
Full-text available
We investigated how altitude affects the decomposition of leaf and root litter in the Andean tropical montane rainforest of southern Ecuador, that is, through changes in the litter quality between altitudes or other site-specific differences in microenvironmental conditions. Leaf litter from three abundant tree species and roots of different diamet...
Article
Here we describe the community structure of soil micro-invertebrates at three altitudes (1000, 2000, and 3000 m) and two soil layers (upper L/F layer and deeper H/Ah layer) of a tropical montane rainforest situated on the eastern slope of the Andes (southern Ecuador) with special focus on nematodes. Nematodes dominated the micro-invertebrate assemb...
Article
Full-text available
Smallholder-dominated agricultural mosaic landscapes are highlighted as model production systems that deliver both economic and ecological goods in tropical agricultural landscapes, but trade-offs underlying current land-use dynamics are poorly known. Here, using the most comprehensive quan-tification of land-use change and associated bundles of ec...
Data
Primer pair sequences for plants, bacteria, and archaea
Data
Supplementary Figures 1 - 9, Supplementary Tables 1 - 5, Supplementary Note 1 and Supplementary References
Article
Full-text available
Large areas of tropical rainforest are being converted to agricultural and plantation land uses, but little is known of biodiversity and ecological functioning under these replacement land uses. We investigated the effects of conversion of rainforest into jungle rubber, intensive rubber and oil palm plantations on testate amoebae, diverse and funct...
Data
Testate amoebae species list with mean density (a) and relative abundance (b) in the four land-use systems (F, rainforest; J, jungle rubber; R, rubber plantation; O, oil palm plantation) of the two localities studied (H, Harapan; B, Bukit Duabelas). (XLSX)
Data
Characteristics of testate amoebae species (and abbreviations used in Fig 3) used for ascribing them to functional or trophic groups: shell composition, shell and aperture size, trophic level, sources for trophic level classification (see text for details). (XLSX)
Data
Means and standard deviation of environmental factors used in the study. (XLSX)
Data
Pearson correlations between environmental factors and density of testate amoebae species in litter and soil. (XLSX)