Blake Schaeffer

Works (19)

Updated: December 21st, 2023 14:09

2023 journal article

Providing a framework for seagrass mapping in United States coastal ecosystems using high spatial resolution satellite imagery

JOURNAL OF ENVIRONMENTAL MANAGEMENT, 337.

By: M. Coffer*, D. Graybill *, P. Whitman *, B. Schaeffer*, W. Salls *, R. Zimmerman *, V. Hill *, M. Lebrasse  n ...

author keywords: Coastal monitoring; Seagrass; WorldView-2; WorldView-3; Satellite remote sensing; Image classification
MeSH headings : United States; Ecosystem; Satellite Imagery; Environmental Monitoring / methods
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
Source: Web Of Science
Added: May 1, 2023

2022 journal article

A validation of satellite derived cyanobacteria detections with state reported events and recreation advisories across US lakes

HARMFUL ALGAE, 115.

By: P. Whitman *, B. Schaeffer*, W. Salls *, M. Coffer n, S. Mishra *, B. Seegers*, K. Loftin *, R. Stumpf *, P. Werdell *

author keywords: Satellite; Water quality; Cyanobacteria; Human health; Recreation advisory; Validation
MeSH headings : Animals; Biomass; Cyanobacteria; Harmful Algal Bloom; Lakes / microbiology; Recreation
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
15. Life on Land (Web of Science)
Source: Web Of Science
Added: June 20, 2022

2022 journal article

Simulated response of St. Joseph Bay, Florida, seagrass meadows and their belowground carbon to anthropogenic and climate impacts

MARINE ENVIRONMENTAL RESEARCH, 179.

By: M. Lebrasse  n, B. Schaeffer*, R. Zimmerman *, V. Hill *, M. Coffer *, P. Whitman *, W. Salls *, D. Graybill *, C. Osburn n 

author keywords: Seagrass; Climate; Water quality; GrassLight; Submerged aquatic vegetation
MeSH headings : Bays; Carbon; Chlorophyll A; Ecosystem; Florida; Humans; Hydrogen-Ion Concentration; Seawater
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: September 26, 2022

2022 article

Temporal Stability of Seagrass Extent, Leaf Area, and Carbon Storage in St. Joseph Bay, Florida: a Semi-automated Remote Sensing Analysis

Lebrasse, M. C., Schaeffer, B. A., Coffer, M. M., Whitman, P. J., Zimmerman, R. C., Hill, V. J., … Osburn, C. L. (2022, March 15). ESTUARIES AND COASTS, Vol. 3.

By: M. Lebrasse *, B. Schaeffer*, M. Coffer*, P. Whitman *, R. Zimmerman *, V. Hill *, K. Islam *, J. Li *, C. Osburn n 

author keywords: Seagrass; Submerged aquatic vegetation; Leaf area index; Carbon; Landsat; Trend analysis
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: April 4, 2022

2022 journal article

Vertical artifacts in high-resolution WorldView-2 and WorldView-3 satellite imagery of aquatic systems

INTERNATIONAL JOURNAL OF REMOTE SENSING, 43(4), 1199–1225.

By: M. Coffer n, P. Whitman *, B. Schaeffer*, V. Hill *, R. Zimmerman *, W. Salls *, M. Lebrasse  n, D. Graybill *

author keywords: WorldView-3; WorldView-2; Time delay integration; Image acquisition; Banding; Striping
UN Sustainable Development Goal Categories
14. Life Below Water (Web of Science; OpenAlex)
Source: Web Of Science
Added: March 21, 2022

2021 journal article

Acute health effects associated with satellite-determined cyanobacterial blooms in a drinking water source in Massachusetts

ENVIRONMENTAL HEALTH, 20(1).

By: J. Wu *, E. Hilborn* , B. Schaeffer*, E. Urquhart *, M. Coffer n, C. Lin *, A. Egorov *

author keywords: Remote sensing; Drinking water; Human illness; Cyanobacteria; Harmful algal blooms; Satellite imagery; Respiratory; Gastrointestinal; Dermal
MeSH headings : Acute Disease; Air Pollutants / analysis; Cyanobacteria; Drinking Water / microbiology; Emergency Service, Hospital / statistics & numerical data; Environmental Monitoring; Eutrophication; Gastrointestinal Diseases / epidemiology; Humans; Massachusetts / epidemiology; Respiratory Tract Diseases / epidemiology; Satellite Imagery; Skin Diseases / epidemiology; Water Pollutants
TL;DR: A significant positive association was demonstrated between satellite-derived cyanobacterial concentrations in source water and respiratory illness occurring 2 days later, and future studies will require direct measures of cyanotoxins and health effects associated with exposure to cyanobacteria-impacted drinking water sources. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (Web of Science; OpenAlex)
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, ORCID
Added: July 26, 2021

2021 journal article

Assessing cyanobacterial frequency and abundance at surface waters near drinking water intakes across the United States

WATER RESEARCH, 201.

By: M. Coffer n, B. Schaeffer*, K. Foreman *, A. Porteous*, K. Loftin *, R. Stumpf *, P. Werdell *, E. Urquhart *, R. Albert *, J. Darling *

author keywords: Cyanobacteria; Drinking water; Source water quality; Remote sensing; Inland water; Water quality
MeSH headings : Cyanobacteria; Drinking Water; Environmental Monitoring; Eutrophication; Lakes; United States
TL;DR: This study presents the first large-scale assessment of cyanobacterial frequency and abundance of surface water near drinking water intakes across the United States, using satellite imagery from the European Space Agency's Ocean and Land Colour Instrument (OLCI) spanning June 2016 through April 2020. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
15. Life on Land (Web of Science)
Source: Web Of Science
Added: August 30, 2021

2021 journal article

Satellite remote sensing to assess cyanobacterial bloom frequency across the United States at multiple spatial scales

ECOLOGICAL INDICATORS, 128.

By: M. Coffer n, B. Schaeffer*, W. Salls *, E. Urquhart *, K. Loftin *, R. Stumpf *, P. Werdell *, J. Darling *

author keywords: Satellite remote sensing; Cyanobacteria; Inland waters; Water quality; Clustering analysis; Indicator
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
15. Life on Land (Web of Science)
Source: Web Of Science
Added: July 6, 2021

2020 journal article

Performance across WorldView-2 and RapidEye for reproducible seagrass mapping

REMOTE SENSING OF ENVIRONMENT, 250.

By: M. Coffer n, B. Schaeffer*, R. Zimmerman *, V. Hill *, J. Li *, K. Islam *, P. Whitman *

author keywords: Remote sensing; Atmospheric correction; WorldView-2; RapidEye; Seagrass; Image classification
TL;DR: The image processing routine developed here offers a reproducible workflow for WorldView-2 and RapidEye imagery, which was tested in two additional coastal systems and showed as much as 97% agreement with aerial estimates, despite differing resolutions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
Source: Web Of Science
Added: December 11, 2020

2019 journal article

Quantifying national and regional cyanobacterial occurrence in US lakes using satellite remote sensing

ECOLOGICAL INDICATORS, 111.

By: M. Coffer n, B. Schaeffer*, J. Darling *, E. Urquhart * & W. Salls *

author keywords: Remote sensing; Harmful algal blooms; Cyanobacteria; Water quality; Inland waters
TL;DR: Using data from the European Space Agency Envisat MEdium Resolution Imaging Spectrometer and the Sentinel-3 Ocean and Land Color Instrument to provide a national overview of the percentage of lakes experiencing a cyanobacterial bloom on a weekly basis for 2008–2011, 2017, and 2018 establishes a baseline of annual occurrence of cyanobacteria blooms in inland lakes across the United States. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
15. Life on Land (Web of Science)
Source: Web Of Science
Added: March 10, 2020

2009 journal article

LIPID CLASS, CAROTENOID, AND TOXIN DYNAMICS OF KARENIA BREVIS (DINOPHYCEAE) DURING DIEL VERTICAL MIGRATION

JOURNAL OF PHYCOLOGY, 45(1), 154–163.

By: B. Schaeffer n, D. Kamykowski n, L. McKay n, G. Sinclair n & E. Milligan n

author keywords: behavior; brevetoxins; dinoflagellate; epoxidation state; lipids
TL;DR: K. brevis may mobilize its toxins into the surrounding environment by reducing lipid concentrations, such as sterols, limiting competition, or toxins are released because lipids are decreased in high light, reducing any protective mechanism against their own toxins. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2009 journal article

Tropical instability wave interactions within the Galapagos Archipelago

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 56(8), 1217–1229.

By: W. Sweet*, J. Morrison*, Y. Liu n, D. Kamykowski n, B. Schaeffer*, L. Xie n, S. Banks *

author keywords: Tropical instability waves; Upwelling; Eastern equatorial pacific; Galapagos; Chlorophyll
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2008 journal article

Phytoplankton biomass distribution and identification of productive habitats within the Galapagos Marine Reserve by MODIS, a surface acquisition system, and in-situ measurements

REMOTE SENSING OF ENVIRONMENT, 112(6), 3044–3054.

By: B. Schaeffer*, J. Morrison*, D. Kamykowski n, G. Feldman*, L. Xie n, Y. Liu  n, W. Sweet n, A. McCulloch n, S. Banks *

author keywords: chlorophyll a; MODIS; surface acquisition system; Galapagos Marine Reserve; phytoplankton; biomass; El Nino; productive habitats
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2007 journal article

A comparison of photoresponse among ten different Karenia brevis (Dinophyceae) isolates

JOURNAL OF PHYCOLOGY, 43(4), 702–714.

By: B. Schaeffer n, D. Kamykowski n, L. McKay n, G. Sinclair n & E. Milligan n

author keywords: carbon; cell division rate; culture; dinoflagellate; F-v/F-m; Karenia brevis; P-E curve; photoinhibition
TL;DR: PAM‐FL techniques used to investigate P–E curves, quantum yield of PSII (Fv/Fm), and chl from 10 K showed that K. brevis was more than capable of utilizing and surviving in light conditions that may be present on cloudless days off Florida. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2007 journal article

Water mass seasonal variability in the Galapagos archipelago

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 54(12), 2023–2035.

By: W. Sweet n, J. Morrison*, D. Kamykowski n, B. Schaeffer n, S. Banks * & A. McCulloch n

author keywords: Galapagos; eastern Pacific; equatorial undercurrent; upwelling; water masses
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2006 journal article

Comparison of swimming speed and photophysiological responses to different external conditions among three Karenia brevis strains

HARMFUL ALGAE, 5(6), 623–636.

By: L. McKay  n, D. Kamykowski n, E. Milligan n, B. Schaeffer n & G. Sinclair n

author keywords: behavior; dinoflagellate; intraspecies comparison; Karenia brevis
TL;DR: The results suggest that cells may partition energy selectively depending on the needs of the cell, and a generalized species response to light and temperature ranges. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2006 journal article

Nitrate uptake by Karenia brevis. I. Influences of prior environmental exposure and biochemical state on diel uptake of nitrate

MARINE ECOLOGY PROGRESS SERIES, 328, 117–124.

By: G. Sinclair n, D. Kamykowski n, E. Milligan n & B. Schaeffer n

author keywords: Karenia brevis; dinoflagellate; physiology; nocturnal uptake; vertical migration
TL;DR: Testing how the physiology of K. brevis contributed to the acquisition of nitrate by evaluating how nitrate uptake changed with prior environmental exposure found enhanced nocturnal uptake compared to cells continuously exposed to nitrate-replete conditions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2006 journal article

Nitrate uptake by Karenia brevis. II. Behavior and uptake physiology in a nitrate-depleted mesocosm with a bottom nutrient source

MARINE ECOLOGY PROGRESS SERIES, 328, 125–131.

By: G. Sinclair n, D. Kamykowski n, E. Milligan n & B. Schaeffer n

author keywords: Karenia brevis; dinoflagellate; physiology; nocturnal uptake; vertical migration; sediment
TL;DR: Both migration, as indicated by diel aggregation patterns, and cell physiology indicate that descent to regions of higher nutrient concentrations were sufficient to main- tain average growth rates of 0.3 div d -1 . (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2005 journal article

Coastal ocean observing technology transfer to educators

MARINE TECHNOLOGY SOCIETY JOURNAL, 39(4), 78–82.

By: L. Spence, B. Schaeffer*, C. Thomas* , T. Hathaway* & M. Olsen

UN Sustainable Development Goal Categories
4. Quality Education (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

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