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Abstract Detail


Plant reproductive strategies under environmental stress

Sherry, Rebecca [1].

Response of flowering phenology and duration of reproduction to warming and soil moisture in a tallgrass prairie.

Warming typically advances spring flowering and been reported to delay later summer flowering. Here phenological reponses of 12 species in a 1 year step warming and double precipitation experiment were examined the year following the treatment year. Changes in phenology due to the previous year's warming were in the opposite direction to those observed during the treatment year. Six species responded to warming in 2004, delaying flowering 6.2 days and fruiting 7.9 days. Unlike 2003, no species advanced flowering phenology in 2004. Delays resulted from a soil moisture deficit in formerly warmed plots that lasted 3 months or more after warming ended. Increased precipitation altered phenology in one species but did not affect duration of reproductive phases. While 10 of 11 responsive species entered bud phase earlier under warming than in controls in 2003, in only 2 species showed a phenological delay at the beginning of the bud phase in 2004. Warming tended to shorten flowering and fruiting stages and total duration in spring annuals. Together, these results suggest that climate anomalies can influence plant reproductive phenology in the following year; here due to a lag in soil moisture recharge.

Broader Impacts:


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1 - University of Oklahoma, Botany & Microbiology, 770 Van Vleet Oval, Rm. 136, Norman, OK, 73019, United States of America

Keywords:
flowering phenology
Duration of flowering
climate change
lag effects.

Presentation Type: Symposium or Colloquium Presentation
Session: SY11
Location: Westminster Room/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 11:05 AM
Number: SY11007
Abstract ID:140


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