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<p>Rare and endemic plant populations are particularly vulnerable to global human-induced perturbations. <i>Teucrium polium</i> subsp. <i>purpurascens</i> (Benth.) (S. Puech, 1976) (Lamiaceae) is a rare and endangered plant species restricted to the coastal habitats of the Calanques National Park (southern France). Most populations are found on a continental archipelago located at two kilometres from the mainland. To investigate the interactions of <i>Teucrium polium</i> subsp. <i>purpurascens</i> with its flower visitors, we compared the insect’s richness and abundance foraging on this rare species, as well as its relative attractiveness, with those of a widespread close relative <i>Teucrium flavum</i> (L., 1753). Here, we show a strong dichotomy in floral visitors foraging on the two plant species, <i>T. p. purpurascens</i> being visited by a wide diversity of insects while <i>T. flavum</i> attracted almost exclusively bees. The two plant species also have very distinct guilds of visiting bees, with only nine species in common. Moreover, the plants’ attractiveness strategies are widely dissimilar. <i>Teucrium p. purpurascens</i> offers a large number of highly nectar-concentrated flowers to a guild of small, short-tongued bees, while <i>T. flavum</i> produces a larger quantity of less concentrated nectar for a guild of large, long-tongued bees. The differences between the two species in both attractiveness strategies and flower visitor guilds highlight the need to consider plant-flower visitor interdependencies for the conservation of rare and isolated plant species.</p>

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Isolated but not alone: rare plant species attracts a greater diversity of floral visitors than common species in Teucrium (Lamiaceae)

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Claire Bouchot,
  • Laurence Affre,
  • Clément Beaumont,
  • Gabriel Nève,
  • Benoît Geslin

摘要

Rare and endemic plant populations are particularly vulnerable to global human-induced perturbations. Teucrium polium subsp. purpurascens (Benth.) (S. Puech, 1976) (Lamiaceae) is a rare and endangered plant species restricted to the coastal habitats of the Calanques National Park (southern France). Most populations are found on a continental archipelago located at two kilometres from the mainland. To investigate the interactions of Teucrium polium subsp. purpurascens with its flower visitors, we compared the insect’s richness and abundance foraging on this rare species, as well as its relative attractiveness, with those of a widespread close relative Teucrium flavum (L., 1753). Here, we show a strong dichotomy in floral visitors foraging on the two plant species, T. p. purpurascens being visited by a wide diversity of insects while T. flavum attracted almost exclusively bees. The two plant species also have very distinct guilds of visiting bees, with only nine species in common. Moreover, the plants’ attractiveness strategies are widely dissimilar. Teucrium p. purpurascens offers a large number of highly nectar-concentrated flowers to a guild of small, short-tongued bees, while T. flavum produces a larger quantity of less concentrated nectar for a guild of large, long-tongued bees. The differences between the two species in both attractiveness strategies and flower visitor guilds highlight the need to consider plant-flower visitor interdependencies for the conservation of rare and isolated plant species.