期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 20, 期 1, 页码 122-132出版社
WILEY
DOI: 10.1111/j.1420-9101.2006.01216.x
关键词
flower colour; Mimulus; natural selection; pollination; reciprocal transplant
We tested whether selection by pollinators could explain the parapatric distribution of coastal red- and inland yellow-flowered races of Mimulus aurantiacus (Phrymaceae) by examining visitation to natural and experimental populations. As a first step in evaluating whether indirect selection might explain floral divergence, we also tested for local adaptation in early life stages using a reciprocal transplant experiment. Hummingbirds visited flowers of each race at similar rates in natural populations but showed strong (> 95%) preference for red flowers in all habitats in experimental arrays. Hawkmoths demonstrated nearly exclusive (> 99% of visits) preference for yellow flowers and only visited in inland regions. Strong preferences for alternative floral forms support a direct role for pollinators in floral divergence. Despite these preferences, measures of plant performance across environments showed that red-flowered plants consistently survived better, grew larger and received more overall pollinator visits than yellow-flowered plants. Unmeasured components of fitness may favour the yellow race in inland habitats. Alternatively, we document a marked recent increase in inland hummingbird density that may have caused a change in the selective environment, favouring the eastward advance of red-flowered plants.
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