Table 1.
Frequency of observed Houston toad (Bufo houstonensis) chorusing, eggs or tadpoles, and emergence for each year and across all years for 17 ponds in Bastrop County, TX.
Figure 1.
Frequency of observation and reproductive success of four chorus size classes.
Mean number of Houston toad (Bufo houstonensis) males attending choruses calculated from nights on which at least one male was heard calling (CHOR, grey bars) and number of ponds exhibiting evidence of reproduction (black bars) for four chorus size classes. Proportion of ponds with evidence of reproduction goes up as CHOR increases, with all ponds in the largest size class having evidence for reproduction.
Figure 2.
Probability of Houston toad (Bufo houstonensis) reproduction as a function of mean chorus size.
X = observed reproduction. Line represents probability of reproduction as predicted using the logistic regression model [P(REP) = e (−2.43+3.29*MCS)/1+e (−2.43+3.29*MCS)]. Probability of reproduction approaches 100% at mean yearly chorus size of 2.0 males.
Table 2.
Models evaluated, −2 log likelihood [−2(LL)], k, Akaike information criterion corrected for small sample size (AICc), and Akaike weights used in model fitting procedure testing chorus size effects on observed reproduction (rep) for the Houston toad (Bufo houstonensis).