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Has .i.Tilia x euchlora./i. a detrimental effect on soil annelids in urban greens?
Schlaghamerský, J. ; Khodabocus, J.B. ; Pižl, Václav
The potential effect of the exotic linden .i.Tilia x euchlora./i., widely planted in urban greens, on soil-dwelling annelids (Lumbricidae, Enchytraeidae) was investigated in two parks in the city of Brno, Czech Republic. Linden trees are the source of honeydew that might affect soil biota and remains an important input of these trees into the soil compartment even if litter is being removed as part of the park management. There have also been discussions about the alleged toxicity of .i.T. x euchlora./i. nectar to pollinators. The native .i.T. platyphyllos./i. was used as a control. Within two days in November 2006 annelids were sampled at three different distances (1 m, 3 m, 6 m) along transects from the trees to well developed lawns. Earthworms were extracted by the electrical-octet method, enchytraeids by wet funnel extraction from soil cores taken down to 12 cm.
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Vybrané fyziologické parametry žížaly .i.Dendrobaena mrazeki./i. (Černosvitov, 1935)
Šustr, Vladimír ; Pižl, Václav
.i.Dendrobaena mrazeki./i. shows preferences for xerothermic habitats, i.e. behaviour unusual for Central European earthworms. Several ecophysiological parameters of .i.D. mrazeki./i. were measured as a basis for further investigation of its environmental adaptations. pH about 7 prevailed in the gut of the species. The profile of digestive enzymes included all important saccharolytic enzymes and did not differ from those of other earthworms indicating no exclusivity in .i.D. mrazeki./i. feeding habits. Melting and supercooling points of body fluid were similar to those of relative species .i.D. octaedra./i.. The adaptation of .i.D. mrazeki./i. to xerothermic habitats may result from its desiccation tolerance, ability of quiescence and/or from its partly endogeic mode of life. Quiescent adult individuals were found to survive about 60 days at 15 % soil moisture.
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