On Limits to Seed Production

Haig, David W.; Westoby, Mark

doi:10.1086/284817

Cited by 312 publications

(296 citation statements)

References 0 publications

Supporting

Mentioning

277

Contrasting

Unclassified

Order By: Relevance

“…Burd (2008) considered a stochastic variant of Haig & Westoby's (1988) model of the consequences of a resource trade-off between investment in pollinator attraction (counteracting PL) and investment in seed development (counteracting resource limitation). Haig and Westoby predicted that selection poised seed production at the transition between pollen and resource limitation.…”

Section: How Common Is Pollen Limitation and When Does It Matter?mentioning

confidence: 99%

“…Importantly, PL is often oversimplified as a consequence of inadequate pollinator attraction, implying that evolutionary options are limited to increased autonomous selfing or increased attractiveness (e.g. Haig & Westoby 1988;Ashman & Morgan 2004;Burd 2008); however, this characterization overlooks many relevant aspects of plant reproduction. Therefore, in the spirit of the Discussion Meeting on 'Darwin and the evolution of flowers', we will review current understanding of possible causes of PL and speculate on their implications for floral evolution, both in the absence and presence of anthropogenic disturbance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Floral adaptation and diversification under pollen limitation

Harder

Aizen

2010

Phil. Trans. R. Soc. B

153

151

View full text Add to dashboard Cite

Pollen limitation (PL) of seed production creates unique conditions for reproductive adaptation by angiosperms, in part because, unlike under ovule or resource limitation, floral interactions with pollen vectors can contribute to variation in female success. Although the ecological and conservation consequences of PL have received considerable attention in recent times, its evolutionary implications are poorly appreciated. To identify general influences of PL on reproductive adaptation compared with those under other seed-production limits and their implications for evolution in altered environments, we derive a model that incorporates pollination and postpollination aspects of PL. Because PL always favours increased ovule fertilization, even when population dynamics are not seed limited, it should pervasively influence selection on reproductive traits. Significantly, under PL the intensity of inbreeding does not determine whether outcrossing or autonomous selfing can evolve, although it can affect which response is most likely. Because the causes of PL are multifaceted in both natural and anthropogenically altered environments, the possible outcrossing solutions are diverse and context dependent, which may contribute to the extensive variety of angiosperm reproductive characteristics. Finally, the increased adaptive options available under PL may be responsible for positive global associations between it and angiosperm diversity.

show abstract

Section: How Common Is Pollen Limitation and When Does It Matter?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Floral adaptation and diversification under pollen limitation

Harder

Aizen

2010

Phil. Trans. R. Soc. B

153

151

View full text Add to dashboard Cite

show abstract

“…Underdeveloped locules, with aborted seeds inside, render fruits somewhat asymmetrical. Retention of nonviable seeds could be interpreted as "nonseed" maternal effort (in the sense of Haig & Westoby 1988) directed to seed dispersal.…”

Section: Maternal Successmentioning

confidence: 99%

Breeding system and maternal success of a perennial hermaphrodite,Discaria americana(Rhamnaceae)

Medán

1993

New Zealand Journal of Botany

View full text Add to dashboard Cite

Various aspects of the reproductive biology of the perennial hermaphrodite D. americana were studied by combining data from both wild and garden-grown individuals from several years. Reproduction in this species is exclusively sexual and strictly xenogamous, with pollen transfer depending solely on insect vectors. Although flower morphology and phenology do not fully prevent selfpollination, and geitonogamy can easily take place, the level of autogamy was low at fruit initiation and fell later to zero due to abortion of self fruits. Thus, some self-incompatibility mechanism is operative in this species. Only 14% of the flowers initiated fruits, and 7.6% of these produced fully developed capsules. Fruit initiation was pollen-limited at the flower level. Causes of low fruit set could not be unequivocally established but probably include resource limitation. The seed/ovule ratio in fruits bearing viable seeds was 47%, which resulted in a brood size of 1.42. As many sterile fruits completed development as those bearing at least one viable seed. Pre-emergent (maternal) reproductive success (percent ovules becoming viable seeds) was 2.8%. Under near-optimal conditions, post-emergent success (percent viable seeds becoming reproductive individuals) was 24%. Overall fecundity was about 0.7%, representing (for 14-year-old individuals) between 120 and 4800 successful offspring per year.

show abstract

“…Dispersal-maintained and dispersal-limited components of diversity would be tightly correlated only if the relationship between dispersal and diversity depicted in figure 1 is a simple positive linear one (see Haig and Westoby 1988;Vandvik and Goldberg 2005). However, metacommunity theory shows that flat, increasing, humped, or more complex relationships can be predicted, depending on the extent to which diversity is also limited by other factors such as local interactions, resource availability, or niche partitioning (Leibold and Miller 2004).…”

mentioning

confidence: 99%

Sources of Diversity in a Grassland Metacommunity: Quantifying the Contribution of Dispersal to Species Richness

Vandvik

Goldberg²

2006

The American Naturalist

View full text Add to dashboard Cite

Metacommunity theory suggests a potentially important role for dispersal in diversity maintenance at local, as well as regional, scales. In addition, propagule addition experiments have shown that dispersal often limits local diversity. However, actual dispersal rates into local communities and the contribution of immigrants to observed local diversity are poorly known. We present a new approach that partitions the diversity of a target community into dispersalmaintained and dispersal-independent components. Specifically, we quantify distances through space and time to the nearest potential seed source for naturally occurring recruits in target communities by using hierarchical data on species pools (local, site, region, and seed bank). Using this "recruit tag" approach, we found that dispersal contributed 29%-57% of the seedling diversity in perennial grasslands with different successional histories. However, both dispersal and seedling mortality remained remarkably constant, in absolute terms, over succession. The considerable loss of diversity over secondary succession (66%), therefore, could be understood only by considering how these processes interact with the decreasing disturbance rate (i.e., frequency of gaps) in later-successional sites. We conclude that a metacommunity perspective is relevant and necessary to understand the diversity and community assembly of this study system.

show abstract

On Limits to Seed Production

Cited by 312 publications

References 0 publications

Floral adaptation and diversification under pollen limitation

Floral adaptation and diversification under pollen limitation

Breeding system and maternal success of a perennial hermaphrodite,Discaria americana(Rhamnaceae)

Sources of Diversity in a Grassland Metacommunity: Quantifying the Contribution of Dispersal to Species Richness

Contact Info

Product

Resources

About