منابع مشابه
Serotiny in California Oaks
Although prolonged seed retention, or serotiny, is believed to be an adaptation to highly variable environments such as the Mediterranean regions of California, no prior study has systematically investigated the prevalence of seed retention among California oaks (family Fagaceae), the dominant woody taxon in California foothill woodlands. We quantified the extent to which acorns were retained i...
متن کاملThe Response of Native Oaks From California and Israel to Drought
California and Israel are both characterized by Mediterranean climates, and the native oaks growing in these two locales occupy similar ecological niches. However, in California certain oak species are having difficulty regenerating adequately, while in Israel this is not a problem. From 2004 to 2006, a series of greenhouse studies were conducted in both Israel and California to sort out the ro...
متن کاملSex Allocation in California Oaks: Trade-Offs or Resource Tracking?
Trade-offs in sex resource allocation are commonly inferred from a negative correlation between male and female reproduction. We found that for three California oak species, aboveground annual net productivity (ANP) differences among individuals were primarily correlated with water availability and soil fertility. Reproductive biomass increased with ANP, but the relative allocation to reproduct...
متن کاملTesting the Terminal Investment Hypothesis in California Oaks.
The terminal investment hypothesis-which proposes that reproductive investment should increase with age-related declines in reproductive value-has garnered support in a range of animal species but has not been previously examined in long-lived plants, such as trees. We tested this hypothesis by comparing relative acorn production and radial growth among 1,000+ mature individuals of eight specie...
متن کاملCalifornia Oaks and Fire: A Review and Case Study
California has a fire-prone Mediterranean climate, and many of its nine species of native oak trees are thought to have evolved with fire. Little has been widely published about the role of fire in the oak recruitment and mortality in the western United States, and there has been some debate about how to reintroduce fire into oak woodlands. We present here a review, synthesis, and analysis of t...
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ژورنال
عنوان ژورنال: California Agriculture
سال: 1990
ISSN: 0008-0845
DOI: 10.3733/ca.v044n02p30