INSECT SEED PREDATORS AS NOVEL AGENTS OF SELECTIONON FRUIT COLOR

@article{Whitney2004INSECTSP,
  title={INSECT SEED PREDATORS AS NOVEL AGENTS OF SELECTIONON FRUIT COLOR},
  author={Kenneth D. Whitney and Maureen L. Stanton},
  journal={Ecology},
  year={2004},
  volume={85},
  pages={2153-2160}
}
The ecological and evolutionary dynamics of fruit color polymorphisms remain poorly known because patterns and agents of selection have rarely been identified. Here, we examine Acacia ligulata, a shrub of the Australian arid zone characterized by a red/yellow/orange aril color polymorphism. Seed production patterns over four populations and three years suggested that spatially variable selection may be acting to maintain the polymorphism: red and yellow aril color morphs each had the highest… 

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Linking frugivores to the dynamics of a fruit color polymorphism.

  • K. Whitney
  • Environmental Science
    American journal of botany
  • 2005
TLDR
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Evidence for simple genetic control of a fruit-colour polymorphism in Acacia ligulata

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Tri-trophic interactions among congeneric sympatric host plants of Chamaecrista, seed predators and parasitoids

TLDR
There was a negative correlation between glandular fruit trichome length and parasitism rates of bruchids, suggesting that seed predation pressure may have produced evolutionary responses from plants (fruit trichomes reduction), which should facilitate parasitoid action.

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Selection on fruit traits is mediated by the interplay between frugivorous birds, fruit flies, parasitoid wasps and seed‐dispersing ants

TLDR
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Genetic diversity and offspring fitness in the red and white fruit color morphs of the wild strawberry Fragaria pentaphylla

TLDR
Overall, results showed partial evidence for difference in pre- and postdispersal fitness between fruit color morphs in F. pentaphylla, and differences in fitness independent of dispersal may partially account for fruit color polymorphism in all cases.

Does attraction to frugivores or defense against pathogens shape fruit pulp composition?

TLDR
It is suggested that the fruit removal rate by seed dispersers is the primary factor selecting the levels of fruit defense, and nutrient-poor fruits have low removal of seed disperser and low probability of attack by pathogens.

PLANT-ANIMAL INTERACTIONS - ORIGINAL PAPER

TLDR
It is suggested that nutrient- poor fruits have low removal of seed dispersers and low probability of attack by pathogens, but those fruits that are quickly removed by vertebrates are nutrient-rich, but although the attack rate of pathogens is also high, these fruits haveLow contents of quantitative defenses such as tannins and phenols.

References

SHOWING 1-10 OF 44 REFERENCES

THE ROLE OF HERBIVORES IN THE MAINTENANCE OF A FLOWER COLOR POLYMORPHISM IN WILD RADISH

TLDR
The data presented here suggest that differential preference and performance of herbivores for R. sativus color morphs may counter selection on flower color exerted by pollinators.

Avian selection of the color-dimorphic fruits of salmonberry, Rubus spectabilis : a field experiment

TLDR
This is the first field study demonstrating significant and consistent fruit-trait selection by birds at a scale relevant to coevolutionary processes and indicates that forces other than animal selective pressure are also shaping the occurrence of fruit color traits in bird-dispersed fruiting plants.

Natural history of Actaea rubra: fruit dimorphism and fruit/seed predation

WILLSON, M. F. (Dept. Ecol., Ethol., and Evol., Univ. Illinois, Champaign, IL, 61820). Natural history of Actaea rubra: fruit dimorphism and fruit/seed predation. Bull. Torrey Bot. Club 110: 298-303.

Ecology of the fruit-colour polymorphism in Rubus spectabilis

TLDR
The need to investigate fruit and seed characteristics that correlate with fruit colour is emphasized; the colour preferences of consumers is only one of several selection pressures that determine the frequency distribution of fruit colours.

Ecology of fruit‐colour polymorphism in Myrtus communis and differential effects of birds and mammals on seed germination and seedling growth

TLDR
Investigation of the fruit-colour polymorphism of Myrtus communis finds that large seeds, which are more rapidly ejected, and are thus less abraded, germinated at a similar speed to non-ingested controls, and variation in seed size within a single species should thus be considered.

PERSPECTIVE: EVOLUTION OF FLOWER COLOR IN THE DESERT ANNUAL LINANTHUS PARRYAE: WRIGHT REVISITED

TLDR
The long‐term studies of three polymorphic populations in the Mojave Desert demonstrate that flower color is subject to selection that varies in both time and space in its direction and magnitude, and refute Wright's conclusion that the flower color polymorphism in L. parryae is an example of isolation by distance.

Fruit color polymorphism in a bird-dispersed shrub (Rhagodia parabolica) in Australia

TLDR
Lack of strong foraging preferences by birds and the different germination behaviors may contribute to the maintenance of the color polymorphism in Rhagodia parabolica.

Variation in predispersal seed predation in several Australian Acacia spp

TLDR
Variation in the degree of predispersal seed predation was apparent both between populations of any particular Acacia sp.

Post-dispersal seed predation: consequences for plant demography and evolution

TLDR
Both spatial variation in post-dispersal seed predation and differences in predation between species are important elements which facilitate the coexistence of different plant species and can influence pre-emptive competition for these microsites.

Evolutionary Consequences of Seed Pools

TLDR
The constraints a seed pool imposes on the evolution of loci controlling seedling and adult characters not directly related to seed dormancy are examined, ensuring that most of the conclusions about the evolutionary effects of seed pools in annuals carry over to the evolutionary effect of standing crops on seedlings and juvenile selection in perennials.