CO2 control of Trichodesmium N2 fixation, photosynthesis, growth rates, and elemental ratios: Implications for past, present, and future ocean biogeochemistry
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.
Convergent evolution and adaptive radiation of beetle-pollinated angiosperms
- P. Bernhardt
- Environmental SciencePlant Systematics and Evolution
- 1 March 2000
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.
Nitrogen fixation and release of fixed nitrogen by Trichodesmium spp. in the Gulf of Mexico
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.
Interactions between changing pCO2, N2 fixation, and Fe limitation in the marine unicellular cyanobacterium Crocosphaera
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.
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.
- N. Vance, P. Bernhardt, R. Edens
- Environmental ScienceAmerican-Eurasian journal of botany
- 1 December 2004
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.
Pollination biology of basal angiosperms (ANITA grade).
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.
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…
RED BOWL-SHAPED FLOWERS: CONVERGENCE FOR BEETLE POLLINATION IN THE MEDITERRANEAN REGION
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.
Understanding Causes and Impacts of the Dinoflagellate, Cochlodinium polykrikoides, Blooms in the Chesapeake Bay
Bioassays determined that C. polykrikoides exerted a lethal affect on juvenile fish and shellfish, causing 100% mortality of juvenile fish (Cyprinodon variegates) in less than 24 h and 20% mortality in juvenile American oysters within 72 h.