期刊
GLOBAL ECOLOGY AND BIOGEOGRAPHY
卷 31, 期 5, 页码 940-953出版社
WILEY
DOI: 10.1111/geb.13469
关键词
animal pollination; latitudinal trait variation; macroecological patterns; ovule number; pollen production; pollen receipt; pollen transfer efficiency
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [PIP 112-200801-01623]
- Fondo para la Investigacion Cientifica y Tecnologica [PICT 2007-01300]
Plant reliance on animal mutualists is expected to decrease with latitude, leading to more pollen wastage in temperate zones. Pollen production is positively associated with latitude, especially in species with large flowers.
Aim Plant reliance on animal mutualists is expected to decrease with latitude owing to increasing environmental instability. As a consequence, more erratic animal pollination in the temperate zones than in the tropics could translate into lower efficiency in pollen transfer, and thus increasing pollen wastage. Despite the relevance of this hypothesis for plant reproductive evolution, the implications of a proposed latitudinal gradient in pollinator reliability for pollen and ovule production, traits directly affecting seed siring and seed set, respectively, remain unresolved. Location Global. Time period 1971-2020. Major taxa studied Angiospermae. Methods Based on a bibliographic survey and our own data, we collated a dataset with information on pollen production (P) and ovule number (O) per flower from 419 studies, including a total of 1,392 animal-pollinated angiosperm species from 141 families distributed worldwide and sampled between the equator and 68.35 degrees latitude. Using phylogenetic general linear mixed models, we investigated latitudinal variation in P and O. We also tested a latitudinal effect on several ancillary plant traits associated with a plant's mating system and pollinator specialization that might confound any latitudinal effect on gamete production. Results P but not O was positively associated with latitude, a trend that even became stronger after including the latitudinally varying ancillary traits (i.e., growth form, flower size, flower symmetry and number of pollinator orders). The latitudinal effect on P was more pronounced among species producing large flowers, a trait that could be linked to self-incompatibility and thus outcrossing. A weak phylogenetic patterning of P also indicates high evolvability potential of this trait, which may have an effect on both male and female plant fitness. Main conclusions Even though a latitudinal trend in pollinator reliability still awaits direct testing, the observed latitudinal increase in P across angiosperms can be interpreted as an evolutionary consequence of an increasingly unpredictable pollination environment.
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