1,721,003 research outputs found
Figure 9 in A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia
No full textFigure 9 Lasioseius orangrimbaen. sp., adult male: a – Chelicera (antiaxial view); b – Gnathotectum.Published as part of Quintero-Gutiérrez, Edwin Javier, Sandmann, Dorothee, Cómbita-Heredia, Orlando, Klarner, Bernhard, Widyastuti, Rahayu & Scheu, Stefan, 2020, A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia, pp. 338-352 in Acarologia 60 (2) on page 349, DOI: 10.24349/acarologia/20204371, http://zenodo.org/record/448782
Impact of tropical lowland rainforest conversion into rubber and oil palm plantations on soil microbial communities
No full textFocusing on Sumatra, a hotspot of tropical lowland rainforest transformation, we investigated effects of the conversion of rainforests into rubber agroforests ("jungle rubber"), intensive rubber, and oil palm plantations on the communities of litter and soil microorganisms and identified factors responsible for these changes. Litter basal respiration, microbial biomass, total bacterial phospholipid fatty acids (PLFAs), and fungal PLFAs did not vary significantly with rainforest conversion. In litter of converted ecosystems, the concentration of certain PLFAs including the Gram-negative bacteria marker PLFA cy17:0 and the Gram-positive bacteria marker PLFA i17:0 was reduced as compared to rainforest, whereas the concentration of the arbuscular mycorrhizal fungi (AMF) marker neutral lipid fatty acid (NLFA) 16:1 omega 5c increased. As indicated by redundancy analysis, litter pH and carbon concentration explained most of the variation in litter microbial community composition. In soil, microbial biomass did not vary significantly with rainforest conversion, whereas basal respiration declined. Total PLFAs and especially that of Gram-negative bacteria decreased, whereas PLFA i17:0 increased with rainforest conversion. The concentration of fungal PLFAs increased with rainforest conversion, whereas NLFA 16:1 omega 5c did not change significantly. Redundancy analysis indicated that soil pH explained most of the variation in soil microbial community composition. Overall, the data suggest that conversion of rainforests into production systems results in more pronounced changes in microbial community composition in soil as compared to litter. In particular, the response of fungi and bacteria was more pronounced in soil, while the response of AMF was more pronounced in litter. Notably, only certain bacterial markers but not those of saprotrophic fungi and AMF were detrimentally affected by rainforest conversion.German Research Foundation (DFG) [CRC990
Lasioseius Berlese 1916
No full textLasioseius Berlese Lasiosieus Berlese 1916: 33; Lindquist and Evans 1965: 40; Christian and Karg 2006: 105; Lindquist and Moraza 2010: 4.Published as part of Quintero-Gutiérrez, Edwin Javier, Sandmann, Dorothee, Cómbita-Heredia, Orlando, Klarner, Bernhard, Widyastuti, Rahayu & Scheu, Stefan, 2020, A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia, pp. 338-352 in Acarologia 60 (2) on page 340, DOI: 10.24349/acarologia/20204371, http://zenodo.org/record/448782
Trophic diversity and niche partitioning in a species rich predator guild – Natural variations in stable isotope ratios (13C/12C, 15N/14N) of mesostigmatid mites (Acari, Mesostigmata) from Central European beech forests
No full textA large number of predatory mesostigmatid mite species populate forest soils in high densities. The present study investigates the trophic structure of the Mesostigmata community of old growth beech stands in Central Germany and identifies potential prey groups using natural variations in stable isotope ratios (C-13/C-12 and N-15/N-14). Data on relative abundances and body mass were included for each of the 40 species studied to analyze functional aspects in Mesostigmata feeding ecology. The results indicate that Mesostigmata predominantly feed on secondary decomposers, whereas primary decomposer and intra-guild prey are of minor importance. Dominant species featured high delta C-13 signatures suggesting that they predominantly feed on species relying on root derived resources such as bacterial feeding nematodes. Less abundant species where characterized by lower delta C-13 values suggesting that they predominantly feed on prey relying on litter derived resources such as fungal feeding Collembola. Related taxa often had distinctively different isotope ratios suggesting that trophic niche partitioning facilitates coexistence of morphologically similar species. Unexpectedly, the trophic position of Mesostigmata species was not related to body size reflecting the varying trophic position of their main prey, nematodes and Collembola, suggesting that body size is a poor predictor of trophic position in soil food webs. (C) 2012 Elsevier Ltd. All rights reserved.German Research Foundation (DFG) [1374
Figure 10 Tarsus II in A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia
No full textFigure 10 Tarsus II with macroseta pl2 in adult females: a –Lasioseius orangrimbaen. sp.; b – Lasioseius laciniatus; c – Lasioseius tricuspidis. No scale. Images b–c taken from VIRMISCO (Deckeret al.2018).Published as part of Quintero-Gutiérrez, Edwin Javier, Sandmann, Dorothee, Cómbita-Heredia, Orlando, Klarner, Bernhard, Widyastuti, Rahayu & Scheu, Stefan, 2020, A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia, pp. 338-352 in Acarologia 60 (2) on page 350, DOI: 10.24349/acarologia/20204371, http://zenodo.org/record/448782
Figure 10 Tarsus II in A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia
No full textFigure 10 Tarsus II with macroseta pl2 in adult females: a –Lasioseius orangrimbaen. sp.; b – Lasioseius laciniatus; c – Lasioseius tricuspidis. No scale. Images b–c taken from VIRMISCO (Deckeret al.2018).Published as part of Quintero-Gutiérrez, Edwin Javier, Sandmann, Dorothee, Cómbita-Heredia, Orlando, Klarner, Bernhard, Widyastuti, Rahayu & Scheu, Stefan, 2020, A new species of the genus Lasioseius (Acari: Blattisociidae) inhabiting litter of secondary rainforest in Sumatra, Indonesia, pp. 338-352 in Acarologia 60 (2) on page 350, DOI: 10.24349/acarologia/20204371, http://zenodo.org/record/448782
Contributions to the knowledge of oribatid mites of Indonesia. 2. The genus Pergalumna (Galumnidae) with description of a new species and key to known species in the Oriental region (Acari, Oribatida)
No full textVolume: 529Start Page: 87End Page: 10
Contributions to the knowledge of oribatid mites of Indonesia. 1. The genus Allogalumna (Galumnidae) with descriptions of two new species (Acari, Oribatida)
No full textVolume: 529Start Page: 71End Page: 8
The first geophilid centipedes from Malesia: a new genus and two new species from Sumatra (Chilopoda: Geophilidae)
No full textVolume: 605Start Page: 53End Page: 7
The structure of salt marsh soil mesofauna food webs - The prevalence of disturbance.
No full textMesofauna taxa fill key trophic positions in soil food webs, even in terrestrial-marine boundary habitats characterized by frequent natural disturbances. Salt marshes represent such boundary habitats, characterized by frequent inundations increasing from the terrestrial upper to the marine pioneer zone. Despite the high abundance of soil mesofauna in salt marshes and their important function by facilitating energy and carbon flows, the structure, trophic ecology and habitat-related diet shifts of mesofauna species in natural salt marsh habitats is virtually unknown. Therefore, we investigated the effects of natural disturbance (inundation frequency) on community structure, food web complexity and resource use of soil mesofauna using stable isotope analysis (15N, 13C) in three salt marsh zones. In this intertidal habitat, the pioneer zone is exposed to inundations twice a day, but lower and upper salt marshes are less frequently inundated based on shore height. The mesofauna comprised 86 species / taxa dominated by Collembola, Oribatida and Mesostigmata. Shifts in environmental disturbances influenced the structure of food webs, diversity and density declined strongly from the land to the sea pointing to the importance of increasing levels of inundation frequency. Accordingly, the reduced diversity and density was associated by a simplification of the food web in the pioneer zone as compared to the less inundated lower and upper salt marsh with a higher number of trophic levels. Strong variations in δ15N signatures demonstrated that mesofauna species are feeding at multiple trophic levels. Primary decomposers were low and most mesofauna species functioned as secondary decomposers or predators including second order predators or scavengers. The results document that major decomposer taxa, such as Collembola and Oribatida, are more diverse than previously assumed and predominantly dwell on autochthonous resources of the respective salt marsh zone. The results further suggest that Mesostigmata mostly adopt an intraguild predation lifestyle. The high trophic position of a large number of predators suggests that intraguild predation is of significant importance in salt marsh food webs. Presumably, intraguild predation contributes to stabilizing the salt marsh food web against disturbances
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