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<p>The number of ovules per flower varies by orders of magnitude among angiosperms: some families show remarkable conservatism, whereas others vary widely even among close relatives. Many hypotheses explaining ovule packaging link this trait to variation in pollen receipt. Here we ask whether pollinator species richness predicts ovule number across angiosperms, as would be expected if pollinator species richness reflects among-flower variance in pollen receipt. We tested this hypothesis using literature-derived data for 191 animal-pollinated plant species across 61 families. We first assessed the association between ovule number and pollinator species richness using ordinary least squares (OLS), and then repeated the analysis using phylogenetic generalized least squares (PGLS) to account for phylogenetic non-independence. Ovule number showed strong phylogenetic constraint, and controlling for phylogeny eliminated the negative OLS association between visitor richness and ovule number. This result may indicate that apparent associations between ovule number and pollinator richness largely reflect shared evolutionary history rather than repeated adaptive responses to pollination environments.</p>

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Is ovule packaging strategy in animal-pollinated plants correlated to the level of specialization of their pollination systems?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Katarzyna Roguz,
  • Justyna Ryniewicz,
  • Anna Szaciłło,
  • Robert R. Junker,
  • Marcin Zych

摘要

The number of ovules per flower varies by orders of magnitude among angiosperms: some families show remarkable conservatism, whereas others vary widely even among close relatives. Many hypotheses explaining ovule packaging link this trait to variation in pollen receipt. Here we ask whether pollinator species richness predicts ovule number across angiosperms, as would be expected if pollinator species richness reflects among-flower variance in pollen receipt. We tested this hypothesis using literature-derived data for 191 animal-pollinated plant species across 61 families. We first assessed the association between ovule number and pollinator species richness using ordinary least squares (OLS), and then repeated the analysis using phylogenetic generalized least squares (PGLS) to account for phylogenetic non-independence. Ovule number showed strong phylogenetic constraint, and controlling for phylogeny eliminated the negative OLS association between visitor richness and ovule number. This result may indicate that apparent associations between ovule number and pollinator richness largely reflect shared evolutionary history rather than repeated adaptive responses to pollination environments.