Reproductive Biology of the Endangered Plant Clematis socialis (Ranunculaceae)

Timmerman-Erskine, Margaret; Boyd, Robert S.

doi:10.2307/2997286

Cited by 17 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The degree of pollination or resource limitation to female reproductive output may differ in importance among individuals in a population (Haig & Westoby 1988), due to variation in plant age or size (Zimmerman & Aide 1989;Lawrence 1993), herbivore damage (Janzen 1976;Lawrence 1993), water availability (Delph 1986), or nutrient or light availability (Niesenbaum 1993;Cunningham 1996;Timmerman-Erskine & Boyd 1999). Similarly, individuals are likely to differ in the level of pollinator service they attract, due to differences in phenotype, size, floral neighbourhood, or microhabitat (e.g., Galen 1985).…”

Section: Introductionmentioning

confidence: 99%

“…The failure of some ovules to develop into seeds may arise from an inadequate supply of suitable pollen (pollen limitation), inadequate resources to develop all ovules into seeds (resource limitation), damage occurring during seed production by herbivores or pathogens (herbivore limitation), or some combination of these (Delph 1986;Schemske & Horvitz 1988;Ackerman & Montalvo 1990;Burd 1994;Timmerman-Erskine & Boyd 1999;Larson & Barrett 2000).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pollinator behaviour, not increased resources, boosts seed set on forest edges in a New Zealand Loranthaceous mistletoe

Montgomery

Kelly²,

Robertson

et al. 2003

New Zealand Journal of Botany

View full text Add to dashboard Cite

these variables to proportion fruit set. In agreement with previous studies, unmanipulated plants were found to be strongly pollen limited, especially in shady locations. However, on plants receiving handpollination, fruit set was uniformly high and was unaffected by edge exposure or light levels. Direct observation of flower visitation rates by birds in the 2000/01 season showed that edge flowers were visited twice as often as interior flowers. These results show that the higher fruit set on edges is due to visitation patterns of pollinators, and not due to greater resource availability on edges. This improved pollination on edges may help to buffer this declining plant against local extinction.Keywords bird pollination; edge effects; fragmentation; Loranthaceae; mistletoe; Peraxilla; pollinator limitation; resource limitation Abstract The endemic New Zealand mistletoe Peraxilla tetrapetala (Loranthaceae) has previously been shown to be pollinator limited, and to experience higher fruit set in increasingly fragmented habitats, but the mechanism for higher fruit set on edges has not been studied. Edges could affect plant resources (through higher light) and/or pollinator behaviour. This study measures the degree to which pollination and resource limitation affect female reproductive success along a gradient of increasing exposure to the forest edge. Forty-two plants in pairs at varying distances from the forest edge were selected from within two Nothofagus forest fragments in the 1999/2000 season; and on one plant in each pair, all ripe undamaged flowers were hand-pollinated. Light levels and the degree of edge exposure were measured for each plant, and path analysis was used to determine the relationship of †Author for correspondence.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pollinator behaviour, not increased resources, boosts seed set on forest edges in a New Zealand Loranthaceous mistletoe

Montgomery

Kelly²,

Robertson

et al. 2003

New Zealand Journal of Botany

View full text Add to dashboard Cite

show abstract

“…As resource conditions at the time of anthesis and fruit development are imperceptible to the plant at the time of flower bud formation, the bet-hedging hypothesis [11,25], where plants are assumed to form flower buds in accordance with potential and ideal resource conditions, may partly explain lower buffaloberry fruit production under low light conditions. Light availability in other species has been correlated with flower number [19,26], thereby limiting fruit and seed formation by setting a limit on the number of fruits that can potentially mature [11]. Since light availability is correlated with air temperature and air humidity [27,28], measures of light availability may be a proxy for conditions that may also affect pollinator activity [13,29,30].…”

Section: Introductionmentioning

confidence: 99%

Direct and Indirect Effects of Overstory Canopy and Sex-Biased Density Dependence on Reproduction in the Dioecious Shrub Shepherdia canadensis (Elaeagnaceae)

Bateman

Nielsen

2020

Diversity

View full text Add to dashboard Cite

This study assessed the reproductive success of a temperate dioecious shrub, Canada buffaloberry, Shepherdia canadensis (L.) Nutt., in central Alberta, Canada, by examining the effects of spatial patterns and overstory canopy on flower and fruit production. S. canadensis is more abundant and productive (more fruit) at forest edges and in forest gaps, suggesting a dependence on higher light conditions than is typical of late-seral forests. We used path analysis to demonstrate that flower and fruit production exhibited density-dependent effects at a scale of 50 m2 around focal female plants. Fruit production was positively affected by male intraspecific density (pollen supply) and negatively affected by female intraspecific density (pollen competition), but not correlated with overall intraspecific density. The effects of sex-differentiated density are partly due to pollinator responses to male plant density. Flower production was positively affected by overall intraspecific density. A pollen supplementation trial doubled fruit production relative to a control, demonstrating that local male density (pollen availability) and pollinator activity can limit fruit production in S. canadensis. Canopy cover was negatively related to both flower and total fruit production, with approximately one-third (34%) of the total effect of canopy on fruit production due to the effect of canopy on flower production. The commonly observed negative association between canopy cover and fruit production in buffaloberry, therefore, is partly a result of the reduction first in flower number and second in fruit set. This study clarifies the mechanisms associated with the often-noted observation, but not previously assessed at the level of individuals, that reproductive output in S. canadensis is density dependent, limited by canopy cover through reductions in both flowering and fruit set, and pollinator limited. These findings hold implications for managing animal species that depend on the fruit of S. canadensis and suggest future directions for research on dioecious and actinorhizal species.

show abstract

“…In the past decade, it has become clear that effective management of populations of rare plants must include understanding communitylevel processes that affect these populations (Sipes and Tepedino, 1995;Corbet, 1997;Timmerman-Erskine and Boyd, 1999;Wall et al, 2003). Interactions between plants and their pollinators are of particular importance as many endangered plants are dependent on pollinators for reproduction and maintenance of viable populations (Nabhan and Flemming, 1993;Kearns and Inouye, 1997;Kearns et al, 1998;Spira, 2001;Wall et al, 2003).…”

mentioning

confidence: 98%

Effectiveness and Importance of Pollinators to the Star Cactus (Astrophytum asterias)

Blair¹,

Williamson²

2008

The Southwestern Naturalist

View full text Add to dashboard Cite

Reproductive Biology of the Endangered Plant Clematis socialis (Ranunculaceae)

Cited by 17 publications

References 31 publications

Pollinator behaviour, not increased resources, boosts seed set on forest edges in a New Zealand Loranthaceous mistletoe

Pollinator behaviour, not increased resources, boosts seed set on forest edges in a New Zealand Loranthaceous mistletoe

Direct and Indirect Effects of Overstory Canopy and Sex-Biased Density Dependence on Reproduction in the Dioecious Shrub Shepherdia canadensis (Elaeagnaceae)

Effectiveness and Importance of Pollinators to the Star Cactus (Astrophytum asterias)

Contact Info

Product

Resources

About