Physical site characteristics limit pollination and fruit set in the dioecious hydrophilous species, Vallisneria americana

  title={Physical site characteristics limit pollination and fruit set in the dioecious hydrophilous species, Vallisneria americana},
  author={Gary Sullivan and John E. Titus},
Experimental and observational studies of the submersed, freshwater macrophyte Vallisneria americana Michx. revealed that depth, wind and wave exposure, and current velocity may all influence fruit set. In this dioecious species, long-pedunculate female flowers are pollinated by free-floating male flowers at the water surface. Average fruit set in the natural populations studied varied from zero to 97% of the flowers observed. With increasing water depth in New York and Pennsylvania lakes… 

Factors Influencing Reproduction in American Wild Celery: A Synthesis

Critical gaps in present knowledge indicate much has yet to be learned to identify different ecotypes of wild celery based on phenological and genetic distinctions, and further research is also needed to assess potential establishment from seed for consideration as an alternative to vegetative propagules in restoration strategies.


Two different management goals (restoration of Vallisneria and protection of manatees) are in conflict and must be simul- taneously considered to devise effective and sustainable ecosystem management scenarios.

Abiotic pollen and pollination: Ecological, functional, and evolutionary perspectives

  • J. Ackerman
  • Environmental Science
    Plant Systematics and Evolution
  • 2004
The transport and capture of pollen in ~20% of all angiosperm families occurs in air and water. In other words, pollination is abiotic and occurs via the fluid media, not an animal vector. Whereas

Circumnutation on the water surface: female flowers of Vallisneria

It is shown that helical intercalary growth at the base of peduncle plays the primary role in all movements in Vallisneria, and gravity and buoyancy forces have a physical effect on the direction of ped uncle elongation, resulting in bud circumnutation on the water surface.

Pollen Limitation and the Evolution of Androdioecy from Dioecy

A simple deterministic model is presented showing that androdioecy can evolve from dioecY under a broad range of realistic conditions, suggesting that the evolution of androdiaecy from dIOecy is highly plausible.

ERDC/TN SAV-06-4, Reproductive Ecology of Vallisneria americana Michaux

BACKGROUND: Commonly known as wild celery, Vallisneria americana Michaux (Figure 1) is an important component of aquatic plant communities in central and eastern North America. Established stands

Development of a model for in vitro culture of Vallisneria americana Michx

An exploratory experimental design was developed to establish a model for Vallisneria americana Michx following conventional in vitro culture procedures for aquatic vegetation, and presterilization of leaves and rhizomes caused the production of exudates, and the addition of 0.01% ascorbic acid to the nutrient medium caused its inhibition.

Desarrollo de un modelo de cultivo in vitro para Vallisneria americana Michx.

An exploratory experimental design was developed to establish a model for Vallisneria americana Michx following conventional in vitro culture procedures for aquatic vegetation, and biphasic germination in aqueous medium with local water and gellified support was selected considering its lower cost and germination efficiency.

Assessing the Potential to Extrapolate Genetic-Based Restoration Strategies Between Ecologically Similar but Geographically Separate Locations of the Foundation Species Vallisneria americana Michx

Restoration of genetic diversity to levels that ensure long-term species persistence is an important management strategy in degraded systems. Unfortunately, genetic data are lacking for many species



Limitations to Fruit Production in Ionopsis utricularioides (Orchidaceae)

No evidence for mate choice in the sense of selective abortion of fruits depending on selfed verses outcrossed pollen parentage is found, and it is speculated that resource limitation of fruit production may have influenced the evolution of nectardeception pollination in many orchids.

Interpopulational variation in fruit production: the role of pollination-limitation in the Olympic Mountains

At Blue Mountain, hand pollination more than doubled the mean seed set of V. cusickii and also significantly increased seed set in two of three other species visited primarily by flies or solitary bees.

Patterns of fruit production in a neotropical orchid: pollinator vs. resource limitation

Patterns of growth, and of flower and fruit production, were monitored over two years in a population of the orchid Aspasia principissa Reichb. f. in central Panama. Observations and experimental


Variation in the number of fruit matured per inflorescence seemed to be related to variation in precipitation and plant survival through the fruit-filling period, and the data support both the second and third hypotheses.

Effects of pollen and nitrogen availability on reproduction in a woodland herb, Lysimachia quadrifolia

Year-and site-specific variation in the factors that limit plant reproduction are demonstrated in Lysimachia quadrifolia ramets in 1982, 1983, and 1984.

Self and cross pollination of Encyclia cordigera (Orchidaceae) in Santa Rosa National Park, Costa Rica

The epiphytic deciduous forest orchid Encyclia cordigera was manually self-pollinated, out-crossed against one other parent, and out-crossed against a maximum number of other parents in Santa Rosa

Variation between years in pollen and nutrient limitation of fruit-set in Banksia spinulosa

Extra flowers may provide opportunities for plants to increase fruit-set when cross-pollination and nutrient levels are high, and the extent of pollen and nutrient limitation of fruit- set may differ among years.

Regulation of Seed-Set in Polemonium viscosum: Floral Scents, Pollination, and Resources

The effects of pollination and resource levels on seed-set in Polemonium viscosum were evaluated at three elevations: 3528, 3640, and 4025 m in the Rocky Mountains of Colorado, indicating that seed- set was pollen limited at all sites and was consistent with the hypothesis of ecotypical differentiation between the floral morphs.

Resource and Pollen Limitation: Plant Size-Dependent Reproductive Patterns in Physalis longifolia

Experimental results are consistent with the hypothesis that large plants are simultaneously resource and pollen limited, and suggest large P. longifolia plants are allocating resources so as to maximize maternal seed production, in contrast, small plants are only pollen limited.

Reproduction in Polemonium: Assessing the Factors Limiting Seed Set

Evidence of pollen and/or resource limitation of seed production in the herbaceous perennial plant Polemonium foliosissimum was investigated and results suggest that individual reproduction was limited by resources other than pollen.