Abstract
Responses of plant traits to climate changes are complex, which could be mirrored by the investigations of herbarium specimens. By examining specimens of Rosa and Cotoneaster species collected since 1920s in Hengduan Mountains, we analyzed the changes of flowering phenology and flower size in the past century when climate changes were considered to be intensified. We found that flowering phenology of Rosa showed no significant change, but flowering phenology of Cotoneaster was delayed in recent years. Flower size of Rosa species showed a marginally significant decrease over the past century. The results suggested that responses of flowering time to global changes and pollinator mediated selection on floral traits might be more complex than what were expected. Our results indicated that future researches based on investigations of herbarium specimens should be carried out on multiple plant species with different flower structures and life histories to better understand the effects of climate changes on plant traits.
Highlights
Species R. longicuspis R. omeiensis R. sericea R. soulieana C. buxifolius C. dielsianus C. franchetii C. microphyllus C. pannosus C. poluninii C. subadpressus C. turbinatus
We found that flowering phenology of Rosa was delayed significantly with the increase of altitude, but showed no significant change in the past century (Table 2)
Flowering phenology of Cotoneaster was delayed with the increase of altitude and in recent years (Table 2)
Summary
Species R. longicuspis R. omeiensis R. sericea R. soulieana C. buxifolius C. dielsianus C. franchetii C. microphyllus C. pannosus C. poluninii C. subadpressus C. turbinatus. We found that flowering phenology of Rosa was delayed significantly with the increase of altitude, but showed no significant change in the past century (Table 2). Flowering phenology of Cotoneaster was delayed with the increase of altitude and in recent years (Table 2).
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