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maritime chaparral

Michael C Vasey, V Thomas Parker, Karen D Holl, Michael E Loik, Seth Hiatt
We investigated the hypothesis that maritime climatic factors associated with summer fog and low cloud stratus (summer marine layer) help explain the compositional diversity of chaparral in the coast range of central California. We randomly sampled chaparral species composition in 0.1-hectare plots along a coast-to-interior gradient. For each plot, climatic variables were estimated and soil samples were analyzed. We used Cluster Analysis and Principle Components Analysis to objectively categorize plots into climate zone groups...
September 2014: Ecology and Evolution
Jarmila Pittermann, Jonathan Lance, Lauren Poster, Alex Baer, Laurel R Fox
Defoliation by herbivores can reduce carbon assimilation, change plant water relations, and even shift the biotic structure of plant communities. In this study, we took advantage of a long-term deer exclosure experiment to examine the consequences of persistent deer herbivory on plant water relations and the xylem structure-function relationships in Ceanothus rigidus, a maritime chaparral shrub in coastal California. Browsed plants had thicker stems with many intertwined short distal twigs, and significantly higher sapwood-to-leaf area ratios than their non-browsed counterparts...
July 2014: Oecologia
Madhav Pandey, Jyotsna Sharma, Donald Lee Taylor, Vern L Yadon
Mycorrhizal association is a common characteristic in a majority of land plants, and the survival and distribution of a species can depend on the distribution of suitable fungi in its habitat. Orchidaceae is one of the most species-rich angiosperm families, and all orchids are fully dependent on fungi for their seed germination and some also for subsequent growth and survival. Given this obligate dependence, at least in the early growth stages, elucidating the patterns of orchid-mycorrhizal relationships is critical to orchid biology, ecology and conservation...
April 2013: Molecular Ecology
Anna L Jacobsen, R Brandon Pratt
A recent study, 'Influence of summer marine fog and low cloud stratus on water relations of evergreen woody shrubs (Arctostaphylos: Ericaceae) in the chaparral of central California' by M. Vasey, M.E. Loik, and V.T. Parker (2012, Oecologia, in press), presented data on the vulnerability to cavitation of eight Arctostaphylos species. We reanalyzed the vulnerability data presented in this manuscript using a different statistical model and have arrived at different conclusions than those reported previously. We suggest that regional differences have not lead to differentiation in cavitation resistance among populations of an Arctostaphylos species and, contrary to the conclusions of Vasey et al...
February 2013: Oecologia
Michael C Vasey, Michael E Loik, V Thomas Parker
Mediterranean-type climate (MTC) regions around the world are notable for cool, wet winters and hot, dry summers. A dominant vegetation type in all five MTC regions is evergreen, sclerophyllous shrubland, called chaparral in California. The extreme summer dry season in California is moderated by a persistent low-elevation layer of marine fog and cloud cover along the margin of the Pacific coast. We tested whether late dry season water potentials (Ψ(min)) of chaparral shrubs, such as Arctostaphylos species in central California, are influenced by this coast-to-interior climate gradient...
October 2012: Oecologia
Adrian J Deveny, Laurel R Fox
Interactions between herbivores and seed predators may have long-term consequences for plant populations that rely on persistent seed banks for recovery after unpredictable fires. We assessed the effects of browsing by deer and seed predation by rodents, ants and birds on the densities of seeds entering the seed bank of Ceanothus cuneatus var. rigidus, a maritime chaparral shrub in coastal California. Ceanothus produced many more seeds when protected from browsers in long-term experimental exclosures than did browsed plants, but the seed densities in the soil beneath browsed and unbrowsed Ceanothus were the same at the start of an intensive one-year study...
November 2006: Oecologia
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