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2006

Plant Sciences

Occidental College

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The Role Of Increased Sea Surface Temperature On Eelgrass Leaf Dynamics: Onset Of El Nin˜ O As A Proxy For Global Climate Change In San Quintı´N Bay, Baja California, Hector A. Echavarria-Heras, Elena Solana-Arellano, Ernesto Franco-Vizcaino Jan 2006

The Role Of Increased Sea Surface Temperature On Eelgrass Leaf Dynamics: Onset Of El Nin˜ O As A Proxy For Global Climate Change In San Quintı´N Bay, Baja California, Hector A. Echavarria-Heras, Elena Solana-Arellano, Ernesto Franco-Vizcaino

Bulletin of the Southern California Academy of Sciences

We present a quantitative study of the effects of sea surface temperatures on eelgrass productivity variables. We compared standing stock variables for Zostera marina for the strong El Nin˜o event of 1986–1987, previously published by other workers for San Quintı´n Bay, Baja California, to our previously unpublished data for the ‘‘normal year’’ of 1992–1993. We found significant differences for most of the variables measured, which included Leaf Area Index, leaf length, width, dry weight and area, biomass, shoot density, and number of leaves per shoot. Inspection of the multivariate ENSO index (MEI) and sea surface temperature ...


Interspecific Competition Between Coleogyne Ramosissima Seedlings And Bromus Rubens, Simon A. Lei Jan 2006

Interspecific Competition Between Coleogyne Ramosissima Seedlings And Bromus Rubens, Simon A. Lei

Bulletin of the Southern California Academy of Sciences

Interactive effects of red brome grass (Bromus rubens) density and time of establishment on the early survival and growth of blackbrush (Coleogyne ramosissima) seedlings were quantitatively investigated. Seeds of Coleogyne and Bromus were collected from Cold Creek of the Spring Mountains in southern Nevada. A series of pot trial experiments were conducted in a controlled environmental glasshouse. In mixed culture pots when Coleogyne seedlings planted four weeks later than Bromus at medium and high density levels, survival of Coleogyne seedlings (experimental populations) was greatly reduced compared to single Coleogyne seedlings that grew alone (control population). Significant interactions were detected between ...