Moeller David A, Briscoe Runquist Ryan D, Moe Annika M, Geber Monica A, Goodwillie Carol, Cheptou Pierre-Olivier, Eckert Christopher G, Elle Elizabeth, Johnston Mark O, Kalisz Susan, Ree Richard H, Sargent Risa D, Vallejo-Marin Mario, Winn Alice A
Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108, USA.
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA.
Ecol Lett. 2017 Mar;20(3):375-384. doi: 10.1111/ele.12738. Epub 2017 Jan 24.
Latitudinal gradients in biotic interactions have been suggested as causes of global patterns of biodiversity and phenotypic variation. Plant biologists have long speculated that outcrossing mating systems are more common at low than high latitudes owing to a greater predictability of plant-pollinator interactions in the tropics; however, these ideas have not previously been tested. Here, we present the first global biogeographic analysis of plant mating systems based on 624 published studies from 492 taxa. We found a weak decline in outcrossing rate towards higher latitudes and among some biomes, but no biogeographic patterns in the frequency of self-incompatibility. Incorporating life history and growth form into biogeographic analyses reduced or eliminated the importance of latitude and biome in predicting outcrossing or self-incompatibility. Our results suggest that biogeographic patterns in mating system are more likely a reflection of the frequency of life forms across latitudes rather than the strength of plant-pollinator interactions.
生物相互作用中的纬度梯度被认为是全球生物多样性和表型变异模式的成因。长期以来，植物生物学家推测，由于热带地区植物与传粉者相互作用的可预测性更高，异交交配系统在低纬度地区比高纬度地区更为常见；然而，这些观点此前尚未得到验证。在此，我们基于来自492个分类群的624项已发表研究，首次对植物交配系统进行了全球生物地理学分析。我们发现，异交率向高纬度地区以及在一些生物群落中呈微弱下降趋势，但自交不亲和频率没有生物地理模式。将生活史和生长型纳入生物地理分析，降低或消除了纬度和生物群落在预测异交或自交不亲和方面的重要性。我们的结果表明，交配系统中的生物地理模式更可能反映的是不同纬度上生活型的频率，而非植物与传粉者相互作用的强度。
