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    Author(s): Clare E. Aslan; Aaron B. Shiels; William Haines; Christina T. Liang
    Date: 2019
    Source: American Journal of Botany. 106(2): 313-324
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (843.0 KB)

    Description

    Premise of the Study

    Over one‐third of the native flowering plant species in the Hawaiian Islands are listed as federally threatened or endangered. Lack of sufficient pollination could contribute to reductions in populations, reproduction, and genetic diversity among these species but has been little studied.

    Methods

    We used systematic observations and manual flower treatments to quantify flower visitation and outcrossing dependency of eight native (including four endangered) plant species in a dryland ecosystem in Hawaii: Argemone glauca, Bidens menziesii, Dubautia linearis, Haplostachys haplostachya, Sida fallax, Silene lanceolata, Stenogyne angustifolia, and Tetramolopium arenarium.

    Key Results

    During 576.36 h of flower observations, only insects visited the flowers. Out of all recorded flower visits, 85% were performed by non‐native species, particularly the honeybee (Apis mellifera) and flies in the family Syrphidae. Some plant species received little visitation (e.g., S. angustifolia received one visit in 120 h of observation), whereas others were visited by a wide diversity of insects. The endangered plant species were visited by fewer visitor taxa than were the common native plant species. For six of the focal plant species, bagging of flowers to exclude pollinators resulted in significant reductions in seed set.

    Conclusions

    The flower visitor community in this system, although heavily dominated by non‐native insects, appears to be facilitating pollination for multiple plant species. Non‐native insects may thus be sustaining biotic interactions otherwise threatened with disruption in this island ecosystem. This may be particularly important for the studied endangered plant species, which exhibit fewer partners than the more common plant species.

    Publication Notes

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    Citation

    Aslan, Clare E.; Shiels, Aaron B.; Haines, William; Liang, Christina T. 2019. Non-native insects dominate daytime pollination in a high-elevation Hawaiian dryland ecosystem. American Journal of Botany. 106(2): 313-324. https://doi.org/10.1002/ajb2.1233.

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    Keywords

    Apis mellifera, Asteraceae, disrupted mutualism, flower pollination treatments, flower visitation observations, Haplostachys haplostachya, island endemics, Silene lanceolata, Stenogyne angustifolia, Tetramolopium arenarium

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