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freshwater sediments. It contains more than a dozen species, some of them widely distrib- uted. Species characterisation has become a difficult or in- tricate matter as lip region morphology shows significant variability and resembles that of members of the genera Acrobeloides Cobb, 1924 and, more rarely

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distinguished morphologically. This was the case for Acrobeloides tricornis , A. cf. sexlineatus and A. cf. buchneri , as well as for Plectus longicaudatus , P. parietinus and P. pusteri . Interestingly, the 800 bp SSU fragment also did not differentiate between these species (Blaxter et al

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38%), Acrobeloides (up to 61%), as well as the fungal-feeding Aphelenchoides (up to 68%). Nematodes in the family Tylenchidae, which can be either fungal feeders or root hair feeders, were also very common, accounting for up to 20% of all nematodes at Merced in year 2. While the overall community

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component analysis of the nematode communities in May 2000 distinguished signiŽ cantly between the soils at the start (Fig. 2). Jeaniebank soil was initially domi- nated by Aphelenchus and Hoplolaimidae; Carselea soil by Paratylenchus , Rhabditidae and Tylenchidae; Craw- ford soil by Acrobeloides

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months by subculturing. Under these conditions the species reproduced over a broadly similar range of temperature ( 1 5-34° C) to that for Acrobeloides buet.rchlii (20-32° C) which was cultivated axenically by Nicholas (1962). Most rapid reproduction took place at 34° C compared with 27-32° C for A

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recorded in both substrates. When considering the soils, only a few taxa, including Acrobeles , Acrobeloides , Chiloplacus , Mesorhabditis and Seleborca , presented higher prominence (PV > 2) despite a diverse recorded bacterivore assemblage. Fungivores, omnivores and carnivores were also identified

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. Portions (250 ml) of four of the stored soils (Aldroughty, Glendevon, Blairgowrie and Coupar Angus) were examined for other nematodes. Live adults and larvae of Pratylenchu.r crenatas, Tylenchorhynchu.r duhius, Aph2lenchu.r avenae, Tylenchu.r sp. and Acrobeloides sp., together 'with larvae, some ensheathed

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-22. - (1967b). Acclimatization in the eccritic thermal response of Ditylenchus dipsaci. Nematologica 13, 385-389. DEAN, C. G. (1967). Observations on the biology of a species of Acrobeloides (Cobb, 1924) Thorne, 1937; together with a preliminary review of the genus. Diploma Imperial College, thesis. EWER, D

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Acrobeloides , Aphelenchoides , Ditylenchus and Filenchus . Other common genera included Heterocephalobus , Wilsonema , Prismatolaimus , Plectus and Alaimus . Fungivorous and bacterivorous nematodes were the most abundant trophic groups at both 0-10 cm and 10-20 cm depths (Table 1). Repeated

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. hapla and Acrobeloides buetschii . Nematology 21 , 625 - 639 . DOI: 10.1163/15685411-00003240 Tzortzakakis , E.A. , Blok , V.C. , Phillips , M.S. & Trudgill , D.L. ( 1999 ). Variation in root-knot nematode ( Meloidogyne spp.) in Crete in relation to control with resistant tomato and

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