Adult singles dating mesquite new mexico
Nectarful flowers are visited between 2 and 4 times more often by a larger diversity of pollinators (29 vs.5, respectively) compared to nectarless individuals. Both nectar morphs have been shown to be self-compatible, but both display a high degree of inbreeding depression (López-Portillo, Eguiarte, and Montaña, 1993).
Some plants, however, show strategies to avoid some of the costs associated with floral displays. Within a population in which most individuals produce a food reward such as nectar, nectarless individuals would have an advantage if they received floral visitors attracted by nectarful individuals while avoiding the costs of nectar production (Little, 1983.Nectarless individuals produced significantly more pollen grains than did nectar producers, but all other measured floral traits showed no differences.Nectarful trees were visited by pollinators 21 times more often and had a significantly higher overall fruit set than did nectarless trees.In such a case, the fitness of nectarful and nectarless plants would be frequency dependent: if nectarless individuals increased in number, pollination rates for all individuals in the population would be expected to diminish significantly (Bell, 1986).Half of the individuals within a mesquite population are nectarful, producing on average 0.51 mg of sucrose equivalents per millilitre of nectar, while the other half produce no nectar at all (López-Portillo, Eguiarte, and Montaña, 1993).To assess differences between morphs in flowering phenology, we recorded the presence–absence of mature inflorescences every 2 d between 14 and 30 March 1994 on nine consecutive observation dates and differences were tested with a 2 × 9 contingency table (Everitt, 1977).
Hand-pollinations were done on ten randomly selected trees (main plot) per nectar morph in March 1996, during the peak flowering period.
Fieldwork was done on a 1-ha area of desert scrubland dominated by within the 1-ha area of desert scrubland.
Tree dimensions were taken as two canopy widths and height.
(2) What is the relative importance of floral traits and pollinator visitation on the reproductive success of each nectar morph?
and (3) Do plants that provide nectar have higher fitness than those that do not?
No differences between nectar morphs in seed mass or in percentage seed germination were found, but heavier seeds tended to have higher heterozygosities.