Neighbourhood density and genetic relatedness interact to determine fruit set and abortion rates in a continuous tropical tree population.

Proceedings. Biological Sciences
F A Jones, L S Comita

Abstract

Tropical trees may show positive density dependence in fruit set and maturation due to pollen limitation in low-density populations. However, pollen from closely related individuals in the local neighbourhood might reduce fruit set or increase fruit abortion in self-incompatible tree species. We investigated the role of neighbourhood density and genetic relatedness on individual fruit set and abortion in the neotropical tree Jacaranda copaia in a large forest plot in central Panama. Using nested neighbourhood models, we found a strong positive effect of increased conspecific density on fruit set and maturation. However, high neighbourhood genetic relatedness interacted with density to reduce total fruit set and increase the proportion of aborted fruit. Our results imply a fitness advantage for individuals growing in high densities as measured by fruit set, but realized fruit set is lowered by increased neighbourhood relatedness. We hypothesize that the mechanism involved is increased visitation by density-dependent invertebrate pollinators in high-density populations, which increases pollen quantity and carry-over and increases fruit set and maturation, coupled with self-incompatibility at early and late stages due to biparenta...Continue Reading

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Citations

Mar 17, 2011·PloS One·Chris J KettleDavid F R P Burslem
Feb 6, 2015·Journal of Biological Dynamics·D Maxin, L Sega
May 18, 2016·BMC Evolutionary Biology·Emmanuelle Porcher, Russell Lande
Nov 12, 2017·Proceedings of the National Academy of Sciences of the United States of America·Antonio R CastillaShalene Jha

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