Morphometric variability was studied in Prionchulus punctatus and Clarkus papillatus from closely related forest sites: Site 1 (eutrophic to calcic mull humus), site 2 (contiguous to site 1, eutrophic mull humus with a more or less leached soil), site 3 (acid mull humus), site 4 (located in site 3 but just under the crown of an old oak, moder humus), site 7 (moder humus, developed in a wide area). Results from correspondence analysis for both nematode species from site 2 suggested two distinct population types (a) with small individuals (Pp: 1.85 ± 0.05 mm and 87.2 ± 5.7 µm for body length and tail length respectively; Cp: 1.11 ± 0.02 mm and 78.5 ± 1.9 µm) with typical characteristics of populations collected from a calcic mull and (b) larger individuals (Pp: 2.14 ± 0.04 mm and 100.2 ± 1.8 µm for body length and tail length respectively; Cp: 1.21 ± 0.01 mm and 83.3 ± 2.2 µm) similar to populations collected from an eutrophic mull. Results from correspondence analysis from site 4 showed that the populations of the two species had intermediate characteristics between populations collected from a mull humus and from a moder humus. Moreover, a laboratory culturing experiment with adult Clarkus papillatus collected from site 3 and cultured on three humus forms (calcic mull, site 1; acid mull, site 3; moder, site 7) showed that this species reproduced successfully on mull acid only. The conjunctural or the structural influence on morphometric plasticity of these species is discussed from a functional ecology aspect.
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