scholarly journals EELGRASS MAPPING IN ATLANTIC CANADA USING WORLDVIEW-2 IMAGERY

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 685-692
Author(s):  
D. Forsey ◽  
B. Leblon ◽  
A. LaRocque ◽  
M. Skinner ◽  
A. Douglas
Keyword(s):  
Ecosystem Services ◽  
New Brunswick ◽  
Random Forests ◽  
Zostera Marina ◽  
Atlantic Canada ◽  
Maximum Likelihood Classifier ◽  
Supervised Classifiers ◽  
Estuarine Lagoon ◽  
Better Than ◽  
Marine Angiosperm

Abstract. Eelgrass (Zostera marina L.) is a marine angiosperm plant that grows throughout coastal areas in Atlantic Canada. Eelgrass meadows provide numerous ecosystem services, and while they have been acknowledged as important habitats, their location, extent, and health in Atlantic Canada are poorly understood. This study examined the effectiveness of WorldView-2 optical satellite imagery to map eelgrass presence in Tabusintac Bay, New Brunswick (Canada), an estuarine lagoon with extensive eelgrass coverage. The imagery was classified using two supervised classifiers: the parametric Maximum Likelihood Classifier (MLC) and the non-parametric Random Forests (RF) classifier. While Random Forests was expected to produce higher classification accuracies, it was shown not to be much better than MLC. The overall validation accuracy was 97.6% with RF and 99.8% with MLC.

scholarly journals EELGRASS MAPPING WITH SENTINEL-2 AND UAV DATA IN PRINCE EDWARD ISLAND (CANADA)

2021 ◽  
Vol V-3-2021 ◽  
pp. 125-132
Author(s):  
E. Gallant ◽  
A. LaRocque ◽  
B. Leblon ◽  
A. Douglas
Keyword(s):  
Random Forests ◽  
Zostera Marina ◽  
Prince Edward Island ◽  
Marine Species ◽  
Atlantic Canada ◽  
Eelgrass Beds ◽  
Future Work ◽  
Classified Image ◽  
Sentinel 2 ◽  
Marine Angiosperm

Abstract. Eelgrass (Zostera marina L.) is a marine angiosperm that grows throughout coastal regions in Atlantic Canada. Eelgrass beds provide a variety of important ecosystem services, and while it is considered an important marine species, little research has been done to understand its distribution and location within Atlantic Canada. The purpose of this study was to assess the capability of Sentinel-2 and UAV imagery to map the presence of eelgrass beds within the Souris River in Prince Edward Island. Both imageries were classified using the non-parametric Random Forests (RF) supervised classifier and the resulting classification was validated using sonar data. The Sentinel-2 classified image had a lower validation accuracy at 77.7%, while the UAV classified image had a validation accuracy of 90.9%. The limitations of the study and recommendations for future work are also presented.

scholarly journals Supposed Periodicity of Redpoll, Carduelis sp., Winter Visitations in Atlantic Canada

2003 ◽  
Vol 117 (4) ◽  
pp. 611
Author(s):  
Anthony J. Erskine ◽  
Reid McManus
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Food Availability ◽  
Prince Edward Island ◽  
Border Region ◽  
Atlantic Canada ◽  
Regular Pattern ◽  
Long Run ◽  
Better Than

Redpoll (primarily Carduelis flammea) data from the New Brunswick–Nova Scotia border region were reviewed in the context of alleged biennial periodicity of irruptions south of their breeding range. Long-term records by the authors suggested a number of departures from visitation in alternate years. Three local Christmas Bird Counts (CBCs) spanning the last 41 winters supported the less-than-regular pattern shown by individual observations. CBC redpoll data from across the Atlantic Provinces revealed annual redpoll visitations across southern New Brunswick, where the largest regional counts (adjusted for observer effort) usually occurred. Visitation to Prince Edward Island, Nova Scotia, and Newfoundland was less frequent, and patterns there were often obscured by scarcity of CBCs with both long-run coverage and redpolls. Examination of those data in relation to varying food availability suggested that irregular abundance but near-annual occurrence of redpoll visitation explains observed observations better than attempts to find periodicity in their irruptions.

scholarly journals Chlororespiration Serves as Photoprotection for the Photo-Inactivated Oxygen-Evolving Complex in Zostera marina, a Marine Angiosperm

2020 ◽  
Vol 61 (8) ◽  
pp. 1517-1529
Author(s):  
Ying Tan ◽  
Quan Sheng Zhang ◽  
Wei Zhao ◽  
Zhe Liu ◽  
Ming Yu Ma ◽  
...  
Keyword(s):  
Zostera Marina ◽  
Thylakoid Membrane ◽  
Physiological Role ◽  
Reducing Power ◽  
Pentose Phosphate ◽  
Oxygen Evolving Complex ◽  
Redox Equilibrium ◽  
Strong Connectivity ◽  
Oxygen Evolving ◽  
Marine Angiosperm

Abstract As an alternative electron sink, chlororespiration, comprising the NAD(P)H dehydrogenase complex and plastid terminal plastoquinone oxidase, may play a significant role in sustaining the redox equilibrium between stroma and thylakoid membrane. This study identified a distinct role for chlororespiration in the marine angiosperm Zostera marina, whose oxygen-evolving complex (OEC) is prone to photo-inactivation as a result of its inherent susceptibility to excess irradiation. The strong connectivity between OEC peripheral proteins and key chlororespiratory enzymes, as demonstrated in the interaction network of differentially expressed genes, suggested that the recovery of photo-inactivated OEC was connected with chlororespiration. Chlorophyll fluorescence, transcriptome and Western blot data verified a new physiological role for chlororespiration to function as photoprotection and generate a proton gradient across the thylakoid membrane for the recovery of photo-inactivated OEC. Chlororespiration was only activated in darkness following excess irradiation exposure, which might be related to electron deficiency in the electron transport chain because of the continuous impairment of the OEC. The activation of chlororespiration in Z. marina was prone to proactivity, which was also supported by the further activation of the oxidative pentose-phosphate pathway synthesizing NADPH to meet the demand of chlororespiration during darkness. This phenomenon is distinct from the common assumption that chlororespiration is prone to consuming redundant reducing power during the short transition phase from light to dark.

Prize and Prejudice

1997 ◽  
Author(s):  
Faye Margaret Kert
Keyword(s):  
Nineteenth Century ◽  
Nova Scotia ◽  
North America ◽  
New Brunswick ◽  
Economic Impact ◽  
War Of 1812 ◽  
Atlantic Canada ◽  
Legal Evolution ◽  
Negative Reputation

This journal examines privateering and naval prizes in Atlantic Canada in the maritime War of 1812 - considered the final major international manifestation of the practice. It seeks to contextualise the role of privateering in the nineteenth century; determine the causes of, and reactions to, the War of 1812; determine the legal evolution of prize law in North America; discuss the privateers of Nova Scotia and New Brunswick, and the methods they utilised to manipulate the rules of prize making during the war; and consider the economic impact of the war of maritime communities. Ultimately, the purpose of the journal is to examine privateering as an occupation in order to redeem its historically negative reputation. The volume is presented as six chapters, plus a conclusion appraising privateering, and seven appendices containing court details, prize listings, and relevant letters of agency.

scholarly journals Disruption of essential habitat by a coastal invader: new evidence of the effects of green crabs on eelgrass beds

2011 ◽  
Vol 68 (9) ◽  
pp. 1852-1856 ◽  
Author(s):  
Andrey Malyshev ◽  
Pedro A. Quijón
Keyword(s):  
Invasive Species ◽  
Zostera Marina ◽  
Laboratory Experiments ◽  
Carcinus Maenas ◽  
Green Crab ◽  
Atlantic Canada ◽  
Marine Science ◽  
Eelgrass Beds ◽  
New Evidence

Abstract Malyshev, A., and Quijón, P. A. 2011. Disruption of essential habitat by a coastal invader: new evidence of the effects of green crabs on eelgrass beds. – ICES Journal of Marine Science, 68: 1852–1856. Eelgrass (Zostera marina) beds have been declining in Atlantic Canada and elsewhere, partly as a result of sediment disruption and direct feeding/cutting of basal meristems by the green crab (Carcinus maenas). Green crabs are detrimental to eelgrass beds, and field and laboratory experiments have confirmed that the deleterious role of this invasive species is mediated by at least two mechanisms, depending on the size/age of the crabs: uprooting by adults and grazing by juveniles. Eelgrass uprooting and grazing by green crabs are likely to contribute to further declines or a lack of recovery of eelgrass beds.

scholarly journals SUMOhunt: Combining Spatial Staging between Lysine and SUMO with Random Forests to Predict SUMOylation

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Amna Ijaz
Keyword(s):  
Amino Acids ◽  
Random Forests ◽  
Sequence Information ◽  
Target Proteins ◽  
Acid Properties ◽  
Amino Acid Properties ◽  
Great Reliability ◽  
Lysine Residues ◽  
Site Recognition ◽  
Better Than

Modification with SUMO protein has many key roles in eukaryotic systems which renders the identification of its target proteins and sites of considerable importance. Information regarding the SUMOylation of a protein may tell us about its subcellular localization, function, and spatial orientation. This modification occurs at particular and not all lysine residues in a given protein. In competition with biochemical means of modified-site recognition, computational methods are strong contenders in the prediction of SUMOylation-undergoing sites on proteins. In this research, physicochemical properties of amino acids retrieved from AAIndex, especially those involved in docking of modifier and target proteins and optimal presentation of target lysine, in combination with sequence information and random forest-based classifier presented in WEKA have been used to develop a prediction model, SUMOhunt, with statistics significantly better than all previous predictors. In this model 97.56% accuracy, 100% sensitivity, 94% specificity, and 0.95 MCC have been achieved which shows that proposed amino acid properties have a significant role in SUMO attachment. SUMOhunt will hence bring great reliability and efficiency in SUMOylation prediction.

Genetic sub-structure and intermediate optimal outcrossing distance in the marine angiosperm Zostera marina

2007 ◽  
Vol 152 (4) ◽  
pp. 793-801 ◽  
Author(s):  
Martin R. Billingham ◽  
Tiago Simões ◽  
Thorsten B. H. Reusch ◽  
Ester A. Serrão
Keyword(s):  
Zostera Marina ◽  
Marine Angiosperm

scholarly journals The Use of Clinical Practise Guidelines for Community-Acquired Pneumonia in Hospitals in Atlantic Canada

2004 ◽  
Vol 11 (4) ◽  
pp. 301-303 ◽  
Author(s):  
Samuel G Campbell
Keyword(s):  
New Brunswick ◽  
Prince Edward Island ◽  
Telephone Survey ◽  
Implementation Strategies ◽  
Standard Of Care ◽  
Community Acquired Pneumonia ◽  
Teaching Hospitals ◽  
Atlantic Canada ◽  
X Ray ◽  
Clinical Practise

BACKGROUND:Clinical practice guidelines (CPGs) have been shown to improve the care of patients presenting to hospital with community-acquired pneumonia (CAP) and are considered the 'standard of care'. The extent of adoption of CPGs in Canada is unclear.OBJECTIVE:To determine the use of CPGs by hospitals in Atlantic Canada (Newfoundland, Nova Scotia, New Brunswick, Prince Edward Island).METHODS:Telephone survey of all hospitals listed in the Canadian Medical Directory as being situated in Atlantic Canada. Hospitals were included if they had all three of the following: an emergency department, x-ray facilities and acute care inpatient beds.RESULTS:Of 143 hospitals, 93 were included for analysis. Of these, 41 (44.1%) used CAP CPGs. Hospitals were less likely to be using CAP CPGs if they were smaller, rural or community hospitals, or if they did not have an intensive care unit. Of the four provinces, New Brunswick had the most hospitals using CAP CPGs (73.1%), while Newfoundland had the least (17.2%).CONCLUSIONS:Although larger teaching hospitals are using CAP CPGs, the degree of adoption of CPGs in smaller hospitals in Atlantic Canada is low. Efforts to produce standard CPGs that can be adapted to different sites, as well as implementation strategies, are indicated.

Sign in / Sign up

Export Citation Format

Share Document