نتایج جستجو برای: number of blooms
تعداد نتایج: 21178320 فیلتر نتایج به سال:
Toxic algal blooms are an important problem worldwide. The literature on toxic cyanobacteria blooms in inland waters reports widely divergent results on whether zooplankton can control cyanobacteria blooms or cyanobacteria suppress zooplankton by their toxins. Here we test whether this may be due to genotype × genotype interactions, in which interactions between the large-bodied and efficient g...
Toxin producing cyanobacterial blooms have increased globally in recent decades in both frequency and intensity. Despite the recognition of this growing risk, the extent and magnitude of cyanobacterial blooms and cyanotoxin prevalence is poorly characterized in the heavily populated region of southern California. Recent assessments of lentic waterbodies (depressional wetlands, lakes, reservoirs...
Cyanobacteria (blue-green algae) are estimated to have evolved 3.5 billion years ago, at which time they began to add oxygen to the existing anaerobic atmosphere, actually changing the chemistry of the planet and allowing new life forms to evolve. These ubiquitous microbes are capable of tolerating desiccation, hypersalinity, hyperthermal conditions, and high ultraviolet radiation, often for ex...
tem for habitat mapping of coral reefs and seagrass beds by integrating satellite images and acousticand ecological sea-truth information. In the field of harmful algal blooms (HAB), our taxonomic and biological knowledge on the HAB species has been much expanded through the program, as exemplified by the identification of the causative species of paralytic (PSPs)and amnesic (ASPs) shellfish po...
Golden alga, Prymnesium parvum, has become a rising concern in terms of conservation. This is due to the toxic blooms they create that kill populations of fish and phytoplankton. P. parvum produce prymnesin toxins, which cause the blooms to be so dangerous. Previous research has claimed that prymnesins lyse cells and toxify other cells, neurons and fish. Specifically, the toxins have been shown...
The brevetoxin-producing dinoflagellate, Karenia brevis, forms nearly annual blooms off the Florida west coast, severely impacting the region's ecology and economy. Bacteria are often cited as either promoting or interfering with the development of algal blooms, and thus a detailed study of the bacterioplankton assemblages associated with K. brevis was undertaken. We developed sixteen 16S rRNA ...
Lakes, rivers and estuaries that experience frequent and/or prolonged blooms of cyanobacteria display an array of ecosystem properties that may have impacts on water quality, biological communities and ecosystem services. Some impacts of blooms may be direct, including possible effects of toxins on fish, invertebrates, and other aquatic fauna, or indirect, including: a reduction of submerged pl...
یکی از مهم ترین روشهایی که برای شناخت سبک ادبی از سبک علمی شناخته شده است نظریه بوزیمان می باشد. بوزیمان معتقد است با بررسی نسبت فعل به صفت در آثار نویسندگان و شعرا می توان به روند ساختار آثار ادبی آنها و عواملی که منجر به ادبی وعلمی شدن متون می گردد پی برد. این روش با بهره گیری از علم آمار و با رویکرد میان رشته ای در پی نزدیک شدن به صحت و دقت می باشد. وی معتقد است که با محاسبه نسبت فعل به صفت ...
چکیده: یکی از مهم ترین روشهایی که برای شناخت سبک ادبی از سبک علمی شناخته شده است نظریه بوزیمان می باشد. بوزیمان معتقد است با بررسی نسبت فعل به صفت در آثار نویسندگان و شعرا می توان به روند ساختار آثار ادبی آنها و عواملی که منجر به ادبی وعلمی شدن متون می گردد پی برد. این روش با بهره گیری از علم آمار و با رویکرد میان رشته ای در پی نزدیک شدن به صحت و دقت می باشد. وی معتقد است که با محاسبه نسبت فعل...
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