BEGIN:VCALENDAR VERSION:2.0 PRODID:-//jEvents 2.0 for Joomla//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VTIMEZONE TZID:America/Los_Angeles X-LIC-LOCATION:America/Los_Angeles BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:bf0b3664d97d3a7e2a438a459573299295 CATEGORIES:CERF Events & Webinars SUMMARY:Application of Computer-Aided Tomography Technology (CTT) DESCRIPTION:
A powerful tool for the i nvestigation of the below-ground structure, function, and condition of Mari ne Benthic and Salt Marsh Communities and response to anthropogenic impacts .
Computer-aided tomography (CT) medical te chnology is usually used to image the internal structures of humans; howeve r, since this same technology was applied to image environmental samples, t his specific application will be differentiated with the abbreviation CTT.< /p>
The first CTT project was started approximately 25 years ago, which i nvestigated the potential below-ground benthic community response to the po llution gradient (metals, sewage, etc.) in Narragansett Bay. Two CTT parame ters were found that correlated inversely with the pollution gradient: the benthic tube area and the wet bulk density of sediments. Both these paramet ers were found to increase with distance from Providence (the pollution sou rce) to the mouth of Narraganset Bay (pristine seawater input) (Perez et.al ., 1999). Next, CTT was applied to Swedish fjords and found that benthic co mmunities closer to the coast were more impacted than fjords further offsho re (Rosenberg et. al., 2007). This investigation also proved that CTT could be applied anywhere else in the world that has medical CT scanners availab le for these projects.
It was almost 5 years later before the first C TT salt marsh investigation was published because it took that long to veri fy CTT results were comparable to standard wetland techniques and could wor k for both organic and mineral-dominated marshes (Davey et. al., 2011). Als o, this CTT project established and quantified in field experimental plots in South Carolina that excess nitrates not only stimulated the below-ground biomass of Spartina alterniflora but these plants also produced larger dia meter rhizomes than the controls. Similar, but more extreme plant effects w ere found in Jamaica Bay, New York, which was massively impacted by anthrop ogenic nutrient nitrogen inputs. Since this last publication, CTT has been applied to a number of salt marsh projects that are listed in the reference s below.
In this webinar, a few of these projects will be discussed t o demonstrate how CTT can investigate below-ground marine benthic and salt marsh communities and contribute to the potential solution of environmental problems. Also for any of you who might be interested in applying CTT to y our own research projects, a brief discussion will be presented about how C TT is accomplished and potential costs to do this type of research.
< strong>References
This webinar has passed. If you are a member of CERF, you can access t his past webinar in our Webinar Library.
Dr. Earl Davey
Earl Davey joined the precursor t o the United States Environmental Protection Agency as a Research Aquatic B iologist in 1967. He later received a Ph.D. from Oregon State University (1 970) in Biological Oceanography. His early research interests were the anal ysis of trace metals in seawater and their effects on marine phytoplankton. Also, the fate and effects of various anthropogenic organic compounds, suc h as kepone in marine microcosms. These microcosm investigations inspired t he idea to apply Computer-aided Tomography Technology (CTT) to view and qua ntify the benthic component of these systems. Eventually, this concept was used to produce the first CTT publication followed by 25 years of research on the development and application of CTT to below-ground marine benthic an d salt marsh communities.
DTSTAMP:20240329T065025 DTSTART;TZID=America/Los_Angeles:20190903T100000 DTEND;TZID=America/Los_Angeles:20190903T110000 SEQUENCE:0 TRANSP:OPAQUE END:VEVENT END:VCALENDAR