P. Bernhardt

Publications138
h-index34
Citations4,299
Highly Influential Citations253
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CO2 control of Trichodesmium N2 fixation, photosynthesis, growth rates, and elemental ratios: Implications for past, present, and future ocean biogeochemistry
TLDR
It is suggested that by the end of this century, elevated CO2 could substantially increase global Trichodesmium N2 and CO2 fixation, fundamentally altering the current marine N and C cycles and potentially driving some oceanic regimes towards P limitation. Expand
Convergent evolution and adaptive radiation of beetle-pollinated angiosperms
  • P. Bernhardt
  • Biology
  • Plant Systematics and Evolution
  • 1 March 2000
TLDR
The floras of Australia and western North America suggest that mutualistic interactions between beetles and flowers has been a continuous and labile trend in angiosperms with novel interactions evolving through the Tertiary. Expand
Nitrogen fixation and release of fixed nitrogen by Trichodesmium spp. in the Gulf of Mexico
TLDR
Calculations suggest that observed densities of Trichodesmium can provide enough N to support moderately sized K. brevis blooms, and an imbalance in elemental turnover or a failure to fully quantify Trichodemium N use is suggested. Expand
RED BOWL-SHAPED FLOWERS: CONVERGENCE FOR BEETLE POLLINATION IN THE MEDITERRANEAN REGION
TLDR
The floral phenology of these “Poppy guild” species correlated positively with the amount of edible pollen produced by each of them and with the visiting frequencies of their pollinators, suggesting that there is a convergent evolution of red bowl-shaped flowers in the East Mediterranean region. Expand
Interactions between changing pCO2, N2 fixation, and Fe limitation in the marine unicellular cyanobacterium Crocosphaera
TLDR
Physiological responses of steady-state iron (Fe)-replete and Fe-limited cultures of the biogeochemically critical marine unicellular diazotrophic cyanobacterium Crocosphaera at glacial, current and projected year 2100 CO 2 levels are examined. Expand
Pollination biology of basal angiosperms (ANITA grade).
TLDR
It is hypothesized that large flowers in Nymphaeaceae are the result of the interaction of heat, floral odors, and colored tepals to trap insects to increase fitness. Expand
Pollination Biology of Lapeirousia Subgenus Lapeirousia (Iridaceae) in Southern Africa; Floral Divergence and Adaptation for Long-Tongued Fly Pollination
Pollination and seed production in Xerophyllum tenax (Melanthiaceae) in the Cascade Range of central Oregon.
TLDR
Flowers show a "leaky" but early-acting self-incompatibility system following self-pollination, and when stigmas are cross-pollinated by hand with pollen from a second inflorescence pollen tubes were seen penetrating style and ovary. Expand
Rates of dinitrogen fixation and the abundance of diazotrophs in North American coastal waters between Cape Hatteras and Georges Bank
We coupled dinitrogen (N2) fixation rate estimates with molecular biological methods to determine the activity and abundance of diazotrophs in coastal waters along the temperate North American… Expand
Pollination of Petaloid Geophytes by Monkey Beetles (Scarabaeidae: Rutelinae: Hopliini) in Southern Africa
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