Table 1.
Predicted differences based of hypotheses 1 and 2 (see details in text).
Fig 1.
Structure of the two experiments conducted in three habitats: AS (below the pond), UC (1 km downstream of AS), and TR (sidearm).
(A) Long-term experiment: 90 individuals of Unio nanus and Anodonta spp. were collected from their dominant habitats (solid arrows), marked with PIT-tags, and divided into three groups. Each group was released into one of the three habitats (dashed arrows). (B) Short-term experiment: 54 U. nanus and 36 Anodonta spp. were collected (solid arrows) and placed in 9 sand-filled boxes (6 U. nanus or 4 Anodonta spp. per box). Three boxes (containing 18 U. nanus or 12 Anodonta spp.) were placed in each habitat (dashed arrows).
Table 2.
Habitat characterization of the three locations “UC”, “AS” and “TR” with water and sediment parameters.
Fig 2.
Detection rate (in %) at the different time points of Unio nanus and Anodonta spp. at each location.
Lines indicate the mean detection rate, shaded grey areas the 95% confidence limits.
Fig 3.
Total distance all Unio nanus and Anodonta spp. specimens moved at each of the three locations: AS (outflow of the pond, dominated by Anodonta spp.
), UC (dominated by U. nanus), TR (sidearm, few mussels) during the experiment. Boxplots represent the 25 and 75 percentile with the median marked by a solid horizontal line and the mean indicated by a dashed horizontal line. The dots represent outliers. Different letters above the boxes represent significant differences between the locations (upper cases) and between the species within the same location (lower cases).
Fig 4.
Movement of (A) Unio nanus and (B) Anodonta spp. individuals at each location between observations.
Boxplots represent the 25 and 75 percentile with the median marked by a solid horizontal line and the mean indicated by a dashed horizontal line. The dots represent outliers. Note that the y-axis is square-root scaled.
Table 3.
Results of species-specific zero-inflated generalized linear models examining differences in distance moved per day between three locations, five different timepoints, and the interactions between location with timepoint.
Fig 5.
Burrowing depth, measured as percentage of the shell burrowed (completely at the surface, i.e., 0%, 1-25, 25-50, 50 to 75-90, and 90-99% of the shell burrowed, and completely burrowed (100%)) of (A) Unio nanus and (B) Anodonta spp. in the short-term experiment at three different locations.
Boxplots represent the 25 and 75 percentile with the median marked by a line and the mean indicated by a dashed line. The dots represent outliers. Different letters above boxes represent significant differences between locations (Tukey test p < 0.05).