Differential Tolerance to Increasing Heterospecific Pollen Deposition in Two Sympatric Species of Burmeistera (Campanulaceae: Lobelioideae)

<div class="line" id="line-9"> <i> Premise of research </i> .&emsp;Heterospecific pollen deposition on stigmas can impact plant reproduction by decreasing seed set or inducing fruit abortion. Pollinating bats often carry pollen from many species on their fur, and thus bat-pollinated flowers may exhibit tolerance to heterospecific pollen deposition, but to our knowledge this has never been studied. We investigated the relative impact of increasing heterospecific pollen deposition on female reproduction of two sympatric species of&nbsp; <i> Burmeistera </i> &nbsp;that experience pollen transfer between them by their shared bat pollinators.</div><div class="line" id="line-56"> <i> Methodology </i> .&emsp;We simulated heterospecific pollen deposition by applying pollen mixtures that differed in the ratio of heterospecific to conspecific flowers used to make them (3&ratio;1; 2&ratio;2, and 1&ratio;3) and measured female reproduction by quantifying fruit abortion, seed number, and seed mass.</div><div class="line" id="line-60"> <i> Pivotal results </i> .&emsp;For&nbsp; <i> Burmeistera borjensis </i> , applying a higher relative amount of heterospecific pollen led to decreased seed production and lighter seed mass, whereas no significant effect of increasing heterospecific pollen was detected in&nbsp; <i> Burmeistera ceratocarpa </i> .&nbsp; <i> Burmeistera borjensis </i> &nbsp;aborted more fruits than&nbsp; <i> B. ceratocarpa </i> &nbsp;(44.1% vs. 18.8%); however, in both species the probability of fruit abortion was not affected by pollination treatment.</div><div class="line" id="line-116"> <i> Conclusions </i> .&emsp;We detected asymmetric impacts on female reproduction between this pair of sympatric&nbsp; <i> Burmeistera </i> : while increasing heterospecific pollen deposition decreased seed production and seed mass for&nbsp; <i> B. borjensis </i> , it had no detectable effect on&nbsp; <i> B. ceratocarpa </i> . Prior work shows that in nature&nbsp; <i> B. borjensis </i> &nbsp;receives much lower amounts of heterospecific pollen than&nbsp; <i> B. ceratocarpa </i> , and thus results suggest that&nbsp; <i> B. ceratocarpa </i> &nbsp;may have stronger gametic or postzygotic isolating barriers to be able to tolerate heterospecific pollen deposition. Future work should explore how different isolation mechanisms contribute to the asymmetric effects on female reproduction that we report here and whether tolerance to heterospecific pollen deposition is a common response among bat-pollinated plants and other plant taxa relying on low-fidelity pollinators.</div>