Figure 4.

Bayesian phylogenetic tree of alveolate SSU rDNA sequences retrieved from sediment and plankton of a suboxic pond (CV1) and an oxic shallow lake (CH1). One hundred and forty eight sequences and 1099 sites were used. Sequences derived from this study are highlighted in bold. For the chimerical phylotypes AT6-4 and LEMD119 only the ciliate (nucleotides 332–1708) and gregarine (nucleotides 1–901) parts were included in the analysis (see Berney et al. 2004). For sequences retrieved in this work, geometric symbols indicate the type of environment in which each phylotype was identified. Posterior probabilities are given on the left at nodes. Bootstrap values obtained in maximum likelihood analyses are given at nodes (right) only when they are greater than 60%. The scale bar represents the number of substitutions per 100 positions per unit branch length.