generation time of 40-44 hrs at 35° is one of the shortest generation times reported for free- living nematodes. A generation time of 7-8 days was reported for Acrobeloide.r buet.rchli at 30° by Nicholas ( 1962) and a generation time of 5-6 days was reported for Panagrellus redivivus at 25 ° by Cryan et al
SPECIES We used 13 species of free-living nematodes from three families (Fig. 1): Cephalobidae ( Acrobeloides maximus and A. nanus ), Panagrolaimidae ( Panagrolaimus redi- vivus and P. rigidus ) and Rhabditidae ( Caenorhabditisel- egans , C. sp. PS1010, Oscheius dolichuroides , O. myrio- phila , Oscheius
uncertain identity, matching the morphology of several cryptic species in the Acrobeloides bodenheimeri species complex (see De Ley et al. , 1999). PDL0033 is a strain that morphologically resembles A. bodenheimeri without being completely identical. Comparison of tree topology and branch lengths with lip
-parasitic nematode Xiphinema americanum (Brown et al ., 2015 ). Although a functional role was not determined, Baquiran et al . ( 2013 ) noted that bacteria belonging to Ochrobactrum and Pedobacter inhabited the gut of the bacterivorous species Acrobeloides maximus . Although molecular characterisation
resulting perimeter files were inspected for chain convergence in Tracer 1.4 (Rambaut & Drummond, 2007 ). The SSU tree was rooted using sequences of Rhabditis myriophila Poinar, 1986 and the Hsp90 tree was rooted using sequences of Acrobeloides amurensis Truskova, 1971 and Cephalobus cubaensis
. II. Influence of the initial food level on the population dynamics of Acrobeloides nanus (De Man, 1880) Anderson, 1968 and Doliochorhabditis dolichura (Schneider, 1866) Andrassy, 1983 .
Polish Journal of Ecology
123 - 135 .
above using all known named species as well as environmental samples deposited in GenBank. For the default substitution model we selected GTR with G + I, which had the smallest AIC based on model selection in MEGA. Acrobeloides maximus (Thorne, 1925) (EU196016) was used as an outgroup. The reliability
( Ulmus sp . ) (Nesterov, 1970; Gebre, unpubl.). Acromoldavicus was created by Nesterov (1970) to accommodate what was previously described as Acrobeloides skrjabini Nesterov & Lisetskaya, 1965, which is the only described species of the genus. * Corresponding author, e-mail: firstname.lastname@example.org The lip