IS FLORAL SPECIALIZATION AN EVOLUTIONARY DEAD‐END? POLLINATION SYSTEM TRANSITIONS IN<i>RUELLIA</i>(ACANTHACEAE)

Tripp, Erin A.; Manos, Paul S.

doi:10.1111/j.1558-5646.2008.00398.x

Cited by 226 publications

(249 citation statements)

References 139 publications

(164 reference statements)

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“…It also overshadows one very interesting direction for future work: different character states have different evolutionary potential for reversals. For example, phylogenetic studies show that some pollinator syndromes in flowers appear to be 'dead ends' and not subject to reversals, whereas others appear free to vary [38]. A similar pattern is found in development of marine snails, where some types of direct development seem free to return to the ancestral condition, whereas others are not …”

Section: Reviewmentioning

confidence: 67%

Reversing opinions on Dollo’s Law

Collin

Miglietta

2008

Trends in Ecology & Evolution

165

159

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Section: Reviewmentioning

confidence: 67%

Reversing opinions on Dollo’s Law

Collin

Miglietta

2008

Trends in Ecology & Evolution

165

159

View full text Add to dashboard Cite

“…For example, recent phylogenetic evidence suggests that transitions from pollination by short-tongued pollinators to those with longer tongues, such as from bee to hummingbird, may often be irreversible (Whittall & Hodges 2007;Thomson & Wilson 2008; but see Tripp & Manos 2008). Similarly, the evolution of dioecy probably reduces the possibility for selfing solutions to pollinator rarity and/or mate limitation, instead favouring the evolution of wind pollination (Friedman & Barrett 2009).…”

Section: ; Also Van Kleunen and Johnson 2007)mentioning

confidence: 99%

Floral adaptation and diversification under pollen limitation

Harder

Aizen

2010

Phil. Trans. R. Soc. B

153

151

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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.

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“…Although such shifts between pollinators could well account for the majority of cases of floral tube elongation (e.g. Whittall & Hodges 2007;Wilson et al 2007;Tripp & Manos 2008), they cannot explain the extreme cases because they cannot account for instances of flowers or tongues continuing to evolve beyond that of existing mutualist partners. That is, the longest flower in a habitat would not continue to evolve to extreme lengths because no pollinators would exist to 'shift' to.…”

Section: Introductionmentioning

confidence: 99%

Going to great lengths: selection for long corolla tubes in an extremely specialized bat–flower mutualism

2009

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In a hypothesis that has remained controversial since its inception, Darwin suggested that long-tubed flowers and long-tongued pollinators evolved together in a coevolutionary race, with each selecting for increasing length in the other. Although the selective pressures that flowers impose on tongue length are relatively straightforward, in that longer tongues allow access to more nectar, selective pressures that pollinators impose on flower length are less clear. Here, we test for such selective pressures in the highly specialized mutualism between the nectar bat Anoura fistulata, which can extend its tongue twice as far as other nectar bats, and Centropogon nigricans, which has flowers of a similar length (8-9 cm). We used flight cage experiments to examine the effects of artificially manipulated flower lengths on (i) bat behaviour and (ii) pollen transfer. Increased length produced longer visits, but did not affect the force bats applied during visits. In the second experiment, flower length increased both the male and female components of flower function: long male flowers delivered more pollen grains and long female flowers received more pollen grains. However, pollen transfer was not correlated with visit duration, so the mechanism behind differences in pollen transfer remains unclear. By demonstrating that bats select for increasing flower length, these results are consistent with the hypothesis that A. fistulata evolved its remarkable tongue in a coevolutionary race with long-tubed flowers similar to that envisioned by Darwin.

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IS FLORAL SPECIALIZATION AN EVOLUTIONARY DEAD‐END? POLLINATION SYSTEM TRANSITIONS INRUELLIA(ACANTHACEAE)

Cited by 226 publications

References 139 publications

Reversing opinions on Dollo’s Law

Reversing opinions on Dollo’s Law

Floral adaptation and diversification under pollen limitation

Going to great lengths: selection for long corolla tubes in an extremely specialized bat–flower mutualism

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