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Commidendrum   robustum    (Roxb.) DC. (St Helena gumwood) and    C.   rugosum    (Dryand.) DC. (St Helena scrubwood) are ecologically important, endemic woody   Asteraceae   from the isolated South Atlantic island of St Helena. Once very abundant, they now exist in sparse fragmented populations due to 500 years of environmental destruction. They are sister taxa that evolved on the island and are reported to hybridise.    Commidendrum   rugosum    has a saucer-like erect capitulum, whereas    C.   robustum    has a somewhat globular hanging capitulum. Using daytime timelapse photography to follow capitula through their life cycle, we found that    C.   rugosum    appears to be myophilous, visited largely by flies (including the endemic syrphid,    Sphaerophoria   beattiei    Doesburg &amp; Doesburg) and occasionally by   Lepidoptera  .    Commidendrum   robustum   , on the other hand, although visited by flies, strongly attracts moths (especially noted at the Millennium Forest site). Our data suggest that moth visits may reduce visits from flies due to the sensitivity of flies to interference by other insects. We conclude that    C.   robustum    may have a mixed syndrome of myophily/phalaenophily and that there is apparently some divergence of the pollination niche between the two species. Its potential in attracting moths, coupled with its former abundance, suggests that it may have been a major food source for adults of the numerous endemic moths. Pollinator activity was measured by insect visitation rates (mean visits per capitulum per day, V) and insect residence time (mean pollinator kiloseconds per capitulum per day, R). Both are higher for    C.   robustum    (   C.   rugosum   , V = 16.4, R = 3.101;    C.   robustum   , V = 34.0, R = 8.274), reflecting the abundance of moths on the capitula at the Millennium Forest site. The conservation implications of the pollination mode are that: (1) there is considerable pollinator activity on the capitula and pollination is not currently a limiting factor for plant reproduction; (2) gene exchange between geographically-isolated populations of    C.   rugosum    is likely to be minimal due to the apparent reliance of the species for pollination on small flies (especially    Sphaerophoria   beattiei   ), which are believed to be not effective as pollinators over long distances (&gt; 1 km). A possible exception is the strong-flying drone-fly,    Eristalis   tenax    Linn. which, although not as abundant as    Sphaerophoria   , does visit the flowers; (3) there is considerable overlap between the two species in flower visitors and interspecific pollen transfer is possible where the two species grow intermixed (which has potential positive and negative implications for species survival).

biodiversity data journal

Moth versus fly: a preliminary study of the pollination mode of two species of endemic   Asteraceae   from St Helena (   Commidendrum   robustum    and    C.   rugosum   ) and its conservation implications