Pollination Systems as Isolating Mechanisms in Angiosperms

Grant, Verne

doi:10.2307/2405454

Cited by 324 publications

(275 citation statements)

References 0 publications

Supporting

Mentioning

271

Contrasting

Unclassified

Order By: Relevance

“…(c) Diversification of the yucca-yucca moth pollination mutualism Two long-standing hypotheses about the evolution of obligate pollination mutualism are that they may spur rapid diversification and that the plants and their specialist pollinators may tend to speciate in parallel (Grant 1949;Kiester et al 1984;Hodges & Arnold 1995;Sargent 2004). Our results provide evidence against elevated rates of diversification in Yucca and do not support strict-sense cospeciation in terms of the contemporaneity of diversification.…”

Section: Discussionmentioning

confidence: 99%

Pattern and timing of diversification in Yucca (Agavaceae): specialized pollination does not escalate rates of diversification

et al. 2007

View full text Add to dashboard Cite

The yucca-yucca moth interaction is one of the most well-known and remarkable obligate pollination mutualisms, and is an important study system for understanding coevolution. Previous research suggests that specialist pollinators can promote rapid diversification in plants, and theoretical work has predicted that obligate pollination mutualism promotes cospeciation between plants and their pollinators, resulting in contemporaneous, parallel diversification. However, a lack of information about the age of Yucca has impeded efforts to test these hypotheses. We used analyses of 4322 AFLP markers and cpDNA sequence data representing six non-protein-coding regions (trnT-trnL, trnL, trnL intron, trnL-trnF, rps16 and clpP intron 2) from all 34 species to recover a consensus organismal phylogeny, and used penalized likelihood to estimate divergence times and speciation rates in Yucca. The results indicate that the pollination mutualism did not accelerate diversification, as Yucca diversity (34 species) is not significantly greater than that of its non-moth-pollinated sister group, Agave sensu latissimus (240 species). The new phylogenetic estimates also corroborate the suggestion that the plant-moth pollination mutualism has at least two origins within the Agavaceae. Finally, age estimates show significant discord between the age of Yucca (ca 6-10 Myr) and the current best estimates for the age of their pollinators (32-40 Myr).

show abstract

Section: Discussionmentioning

confidence: 99%

Pattern and timing of diversification in Yucca (Agavaceae): specialized pollination does not escalate rates of diversification

et al. 2007

View full text Add to dashboard Cite

show abstract

“…However, they have been extensively discussed in the case of land plants, with animal pollination proposed as a key factor in the K-Cz radiation of angiosperms (14)(15)(16)(17)(18). Pollination of plants by animals, as opposed to wind, is postulated to permit additional modes of prezygotic reproductive isolation, which could enhance speciation in conjunction with other isolation mechanisms (19).…”

Section: Fertilization Mechanismmentioning

confidence: 99%

Sex and the shifting biodiversity dynamics of marine animals in deep time

Bush

Hunt

Bambach

2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

The fossil record of marine animals suggests that diversity-dependent processes exerted strong control on biodiversification: after the Ordovician Radiation, genus richness did not trend for hundreds of millions of years. However, diversity subsequently rose dramatically in the Cretaceous and Cenozoic (145 million years ago–present), indicating that limits on diversification can be overcome by ecological or evolutionary change. Here, we show that the Cretaceous–Cenozoic radiation was driven by increased diversification in animals that transfer sperm between adults during fertilization, whereas animals that broadcast sperm into the water column have not changed significantly in richness since the Late Ordovician (∼450 million years ago). We argue that the former group radiated in part because directed sperm transfer permits smaller population sizes and additional modes of prezygotic isolation, as has been argued previously for the coincident radiation of angiosperms. Directed sperm transfer tends to co-occur with many ecological traits, such as a predatory lifestyle. Ecological specialization likely operated synergistically with mode of fertilization in driving the diversification that began during the Mesozoic marine revolution. Plausibly, the ultimate driver of diversification was an increase in food availability, but its effects on the fauna were regulated by fundamental reproductive and ecological traits.

show abstract

“…(ii) Monoecy may be correlated with increased probability of speciation after hybridization (Rieseberg 1997) or long-distance dispersal (Baker 1955), whereas the tendency for dioecious species to have generalist pollinators may inhibit reproductive isolation necessary for speciation (Bawa & Opler 1975;Bawa 1994). (iii) Biotic pollination might increase reproductive isolation through pollinator specificity (Grant 1949) and has been implicated as instrumental in the rapid diversification of orchids around the late Cretaceous (Crane et al 1995). (iv) Biotic dispersal might increase the probability of long-distance dispersal, promoting establishment of isolated populations, which may then diverge (Eriksson & Bremer 1992).…”

Section: Flowering Plantsmentioning

confidence: 99%

Environmental causes for plant biodiversity gradients

Davies

Barraclough

Savolainen

et al. 2004

Phil. Trans. R. Soc. Lond. B

View full text Add to dashboard Cite

One of the most pervasive patterns observed in biodiversity studies is the tendency for species richness to decline towards the poles. One possible explanation is that high levels of environmental energy promote higher species richness nearer the equator. Energy input may set a limit to the number of species that can coexist in an area or alternatively may influence evolutionary rates. Within flowering plants (angiosperms), families exposed to a high energy load tend to be both more species rich and possess faster evolutionary rates, although there is no evidence that one drives the other. Specific environmental effects are likely to vary among lineages, reflecting the interaction between biological traits and environmental conditions in which they are found. One example of this is demonstrated by the high species richness of the iris family (Iridaceae) in the Cape of South Africa, a likely product of biological traits associated with reproductive isolation and the steep ecological and climatic gradients of the region. Within any set of conditions some lineages will tend to be favoured over others; however, the identity of these lineages will fluctuate with a changing environment, explaining the highly labile nature of diversification rates observed among major lineages of flowering plants.

show abstract

Pollination Systems as Isolating Mechanisms in Angiosperms

Cited by 324 publications

References 0 publications

Pattern and timing of diversification in Yucca (Agavaceae): specialized pollination does not escalate rates of diversification

Pattern and timing of diversification in Yucca (Agavaceae): specialized pollination does not escalate rates of diversification

Sex and the shifting biodiversity dynamics of marine animals in deep time

Environmental causes for plant biodiversity gradients

Contact Info

Product

Resources

About