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7 results for “Senna mexicana var. chapmanii”
Fig. 3 in Exploring whether and how ants (Hymenoptera: Formicidae) affect reproductive fitness in Senna mexicana var. chapmanii (Fabaceae)
Fig. 3. Correlation between the number of active inflorescences on Senna chapmanii plants at the time of observation and the number of pollinator visits. Circles represent the mean number of pollinator visits per observation on plants with different numbers of inflorescences. In the axis label, No' refers to number.
Fig. 5 in Exploring whether and how ants (Hymenoptera: Formicidae) affect reproductive fitness in Senna mexicana var. chapmanii (Fabaceae)
Fig. 5. Reproductive fitness of Senna chapmanii plants with (Control) and without (Tanglefoot™) ants. Bars represent the means of weekly measurements taken over the course of the 8 mo experiment. Error bars represent standard error. In the axis label, "no's." refers to numbers.
Fig. 1. A in Exploring whether and how ants (Hymenoptera: Formicidae) affect reproductive fitness in Senna mexicana var. chapmanii (Fabaceae)
Fig. 1. A. Mean rates of pre-dispersal seed predation on Senna chapmanii plants with (Control) and without (Tanglefoot™) ants. Seed predation was calculated for each plant as the number of herbivore damaged seeds divided by the total number of developing seeds (fertilized ovules minus aborted seeds); B. Mean pollinator efficiency on S. chapmanii plants with and without ants. Pollinator efficiency was measured as the proportion of ovules fertilized for each plant; C. Mean effective fecundity of S. chapmanii plants with and without ants. Effective fecundity was calculated for each plant as the number of non-predated mature seeds divided by the total number of ovules. In all 3 cases, comparisons were made between treatments using Mann–Whitney U tests, and results were deemed statistically significant if P values were ≤0.05. Error bars represent standard error in all cases. No significant differences were observed between treatments.
Fig. 2 in Exploring whether and how ants (Hymenoptera: Formicidae) affect reproductive fitness in Senna mexicana var. chapmanii (Fabaceae)
Fig. 2. Mean number (A) and duration (B) of pollinator visits on Senna chapmanii plants with and without ants. In both cases, comparisons were made between treatments using Mann–Whitney U tests, and results were deemed statistically significant if P values were ≤0.05. Error bars represent standard error. Asterisks indicate significant differences. In the axis label, no' refers to number.
Fig. 4 in Exploring whether and how ants (Hymenoptera: Formicidae) affect reproductive fitness in Senna mexicana var. chapmanii (Fabaceae)
Fig. 4. Mean size of Senna chapmanii plants in the presence and absence of ants over the course of the 8 mo experiment. Plant size was estimated as the number of growing stems with 10 or more leaves.
Data from: Quantity over quality: light intensity, but not red/far-red ratio, affects extrafloral nectar production in Senna mexicana var. chapmanii
Extrafloral nectar (EFN) mediates food-for-protection mutualisms between plants and insects and provides plants with a form of indirect defense against herbivory. Understanding sources of variation in EFN production is important because such variations affect the number and identity of insect visitors and the effectiveness of plant defense. Light represents a potentially crucial tool for regulating resource allocation to defense, as it not only contributes energy but may help plants to anticipate future conditions. Low red/far-red (R/FR) light ratios can act as a signal of the proximity of competing plants. Exposure to such light ratios has been shown to promote competitive behaviors that coincide with reduced resource allocation to direct chemical defenses. Little is known, however, about how such informational light signals might affect indirect defenses such as EFN, and the interactions that they mediate. Through controlled glasshouse experiments, we investigated the effects of light intensity, and R/FR light ratios, on EFN production in Senna mexicana var. chapmanii. Plants in light-limited conditions produced significantly less EFN, and leaf damage elicited increased EFN production regardless of light conditions. Ratios of R/FR light, however, did not appear to affect EFN production in either damaged or undamaged plants. Understanding the effects of light on indirect defenses is of particular importance for plants in the threatened pine rockland habitats of south Florida, where light conditions are changing in predictable ways following extensive fragmentation and subsequent mismanagement. Around 27% of species in these habitats produce EFN and may rely on insect communities for defense.
Data from: Quantity over quality: light intensity, but not red/far-red ratio, affects extrafloral nectar production in Senna mexicana var. chapmanii
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