Pollination unpredictability and ovule number in a South-Andean Proteaceae along a rainfall gradient
Vanina Ruth Chalcoff A B and Marcelo Adrián Aizen A
+ Author Affiliations
- Author Affiliations
A Laboratorio Ecotono, INIBIOMA (CONICET – UNCO), Quintral 1250, 8400, Bariloche, Río Negro, Argentina.
B Corresponding author. Email: vchalcoff@gmail.com
Australian Journal of Botany 64(1) 8-14 https://doi.org/10.1071/BT15016
Submitted: 20 January 2015 Accepted: 10 October 2015 Published: 5 February 2016
Abstract
Pollen limitation occurs frequently in plant populations and, as result, many ovules are wasted. One possible adaptive explanation posits that ovule overproduction represents a ‘bet-hedging’ strategy against pollination inefficiency. This hypothesis is supported by comparative evidence showing that unpredictability in pollen receipt is positively associated with an increasing number of ovules per flower across species. Yet, this proposition has not been tested at the intraspecific level, where natural selection operates. Here, we evaluated the relationship between pollination unpredictability, considering both pollination quantity and quality, and number of ovules per flower, across 16 populations of the south-Andean generalist treelet Embothrium coccineum J.R.Forster and G.Forst from north-western Patagonia, which occurs along a west–east gradient of decreasing rainfall. Despite sizable variation in mean number of ovules per flower, we found no increase in ovule production with increasing pollination unpredictability across populations. Instead, we found that mean number of ovules per flower decreased with decreasing rainfall. Therefore, in this species, there was no support for the proposal that ovule overproduction represents a bet-hedging strategy against unpredictable pollen receipt. Rather, the number of ovules per flower seems to be conditioned primarily by resource availability.
Additional keywords: among-population variation, ovule number per flower, resource availability.
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