Plants with longer-lived seeds have lower local extinction rates in grassland remnants 1950-1985
نویسندگان
چکیده
منابع مشابه
Taller plants have lower rates of molecular evolution.
Rates of molecular evolution have a central role in our understanding of many aspects of species' biology. However, the causes of variation in rates of molecular evolution remain poorly understood, particularly in plants. Here we show that height accounts for about one-fifth of the among-lineage rate variation in the chloroplast and nuclear genomes of plants. This relationship holds across 138 ...
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BACKGROUND Hospital readmission is an important clinical outcome of patients with heart failure. Its relation to length of stay for the initial hospitalization is not clear. METHODS AND RESULTS We used hierarchical modeling of data from a clinical trial to examine variations in length of stay across countries and across hospitals in the United States and its association with readmission withi...
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Although habitat fragmentation is a major threat to global biodiversity, the demographic mechanisms underlying species loss from tropical forest remnants remain largely unexplored. In particular, no studies at the landscape scale have quantified fragmentation's impacts on colonization, extinction, and local population growth simultaneously. In central Amazonia, we conducted a multiyear demograp...
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Background: Patients with rheumatoid arthritis (RA) suffer from wide ranges of autoimmune reactions in joints. The mechanism of which is generally unknown and maybe associated with Treg deregulation. Objective: To compare the frequency of nTregs in peripheral blood of patients with active rheumatoid disease with healthy individuals. Methods: Twenty five newly diagnosed patients with active RA d...
متن کاملSeeds of alpine plants are short lived: implications for long-term conservation.
BACKGROUND AND AIMS Alpine plants are considered one of the groups of species most sensitive to the direct and indirect threats to ecosystems caused by land use and climate change. Collecting and banking seeds of plant species is recognized as an effective tool for providing propagating material to re-establish wild plant populations and for habitat repair. However, seeds from cold wet environm...
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ژورنال
عنوان ژورنال: Oecologia
سال: 1999
ISSN: 0029-8549,1432-1939
DOI: 10.1007/s004420050888