Peter D Countway21
Rebecca J Gast16
21Peter D Countway
16Rebecca J Gast
Learn More
  • David A Caron, Mark R Dennett, Darcy J Lonsdale, Dawn M Moran, Ludmilla Shalapyonok, D A Caron
  • 2000
Microplankton abundances and phytoplankton mortality rates were determined at six stations during four cruises spanning three seasons in the Ross Sea polynya, Antarctica (early spring, Oct.}Nov. 1996; mid-late summer, Jan.}Feb. 1997; fall, Apr. 1997; mid-late spring, Nov.}Dec. 1997). Rates of microzooplankton herbivory were measured using a modi"ed dilution(More)
This paper describes the design, development, and initial application of a sensor-actuated network for sensing and sampling microbial communities in aquatic ecosystems. The network consists of ten stationary buoys and one mobile robotic boat for real-time, in situ measurements and analysis of chemical and physical factors governing the abundance and(More)
Microbes have central roles in ocean food webs and global biogeochemical processes, yet specific ecological relationships among these taxa are largely unknown. This is in part due to the dilute, microscopic nature of the planktonic microbial community, which prevents direct observation of their interactions. Here, we use a holistic (that is, microbial(More)
Autonomous Underwater Vehicles (AUVs) are revolutionizing oceanog-raphy. Most high-endurance and long-range AUVs rely on satellite phones as their primary communications interface during missions for data/command telemetry due to its global coverage. Satellite phone (e.g., Iridium) expenses can make up a significant portion of an AUV's operating budget(More)
Literature review and synthesis of growth rates of aquatic protists focused on the role of temperature in the formation of massive annual algal blooms in high-latitude ecosystems. Maximal growth rates of herbivorous protists equaled or exceeded maximal growth rates of phototrophic protists at temperatures above 15uC. Maximal growth rates of herbivorous(More)
Ostreococcus is a genus of widely distributed marine phytoplankton which are picoplanktonic in size (<2 mum) and capable of rapid growth. Although Ostreococcus has been detected around the world, little quantitative information exists on its contribution to planktonic communities. We designed and implemented a genus-specific TaqMan-based quantitative PCR(More)
single-celled, microscopic forms nearly 4 billion years ago. These minute forms constituted all life on the planet for roughly half of Earth's biological history, and microbes have remained important determinants of organic matter production , trophic transfer, and degradation throughout Earth's entire history, although more attention and research tend to(More)
Quantitative polymerase chain reaction (qPCR) for the identiWcation and quantiWcation of microbes has become a common tool for the study of harmful algal blooms (HABs). We developed a qPCR method for the dia-tom genus Pseudo-nitzschia. Several species of this genus form toxic blooms through the production of the neurotoxin domoic acid (DA). Outbreaks of(More)
Protistan species are found in almost every environment on our planet, and have adapted in many ways to survive and thrive under dramatically different conditions. Some of the most diverse adaptations involve symbiotic relationships with prokaryotes. Described symbioses primarily involve heterotrophic protists, including ciliates, Rhizaria (amoebae,(More)
The effects of temperature on the growth rate and gross growth efficiency (GGE) of the heterotrophic nanoflagellate, Paraphysomonas imperforata, cultured from the Ross Sea, Antarctica were investigated using five experimental temperatures (range=0-20 degrees C). This bacterivorous protist exhibited measurable growth over the temperature range examined,(More)