scholarly journals Nearshore Benthic Habitat Mapping Based on Multi-Frequency, Multibeam Echosounder Data Using a Combined Object-Based Approach: A Case Study from the Rowy Site in the Southern Baltic Sea

2018 ◽  
Vol 10 (12) ◽  
pp. 1983 ◽  
Author(s):  
Lukasz Janowski ◽  
Karolina Trzcinska ◽  
Jaroslaw Tegowski ◽  
Aleksandra Kruss ◽  
Maria Rucinska-Zjadacz ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Ground Truth ◽  
Habitat Mapping ◽  
Acoustic Properties ◽  
Benthic Habitat ◽  
Marine Habitat ◽  
Multibeam Echosounder ◽  
Southern Baltic Sea ◽  
Object Based ◽  
Southern Baltic

Recently, the rapid development of the seabed mapping industry has allowed researchers to collect hydroacoustic data in shallow, nearshore environments. Progress in marine habitat mapping has also helped to distinguish the seafloor areas of varied acoustic properties. As a result of these new developments, we have collected a multi-frequency, multibeam echosounder dataset from the valuable nearshore environment of the southern Baltic Sea using two frequencies: 150 kHz and 400 kHz. Despite its small size, the Rowy area is characterized by diverse habitat conditions and the presence of red algae, unique on the Polish coast of the Baltic Sea. This study focused on the utilization of multibeam bathymetry and multi-frequency backscatter data to create reliable maps of the seafloor. Our approach consisted of the extraction of 70 secondary features of bathymetric and backscatter data, including statistic and textural attributes of different scales. Based on ground-truth samples, we have identified six habitat classes and selected the most relevant features of the bathymetric and backscatter data. Additionally, five types of image processing pixel-based and object-based classifiers were tested. We also evaluated the performance of algorithms using an accuracy assessment based on the validation subset of the ground-truth samples. Our best results reached 93% overall accuracy and a kappa coefficient of 0.90, confirming that nearshore seabed habitats can be accurately distinguished based on multi-frequency, multibeam echosounder measurements. Our predictive habitat mapping of shallow euphotic zones creates a new scientific perspective and provides relevant data for the management of natural resources. Object-based approaches previously used in various environments and areas suggest that methodology presented in this study may be scalable.

scholarly journals An evaluation of supervised and unsupervised classification techniques for marine benthic habitat mapping using multibeam echosounder data

2014 ◽  
Vol 72 (5) ◽  
pp. 1498-1513 ◽  
Author(s):  
Jay Calvert ◽  
James Asa Strong ◽  
Matthew Service ◽  
Chris McGonigle ◽  
Rory Quinn
Keyword(s):  
Selection Process ◽  
Ground Truth ◽  
Unsupervised Classification ◽  
Horizontal Resolution ◽  
Habitat Mapping ◽  
Benthic Habitat ◽  
Marine Habitat ◽  
Ground Truth Data ◽  
Multibeam Echosounder ◽  
Acoustic Data

Abstract Marine habitat mapping provides information on seabed substrata and faunal community structure to users including research scientists, conservation organizations, and policy makers. Full-coverage acoustic data are frequently used for habitat mapping in combination with video ground-truth data in either a supervised or unsupervised classification. In this investigation, video ground-truth data with a camera footprint of 1 m2 were classified to level 4 of the European Nature Information System habitat classification scheme. Acoustic data with a horizontal resolution of 1 m2 were collected over an area of 130 km2 using a multibeam echosounder, and processed to provide bathymetry and backscatter data. Bathymetric derivatives including eastness, northness, slope, topographic roughness index, vector rugosity measure, and two measures of curvature were created. A feature selection process based on Kruskal–Wallis and post hoc pairwise testing was used to select environmental variables able to discriminate ground-truth classes. Subsequently, three datasets were formed: backscatter alone (BS), backscatter combined with bathymetry and derivatives (BSDER), and bathymetry and derivatives alone (DER). Two classifications were performed on each of the datasets to produce habitat maps: maximum likelihood supervised classification (MLC) and ISO Cluster unsupervised classification. Accuracy of the supervised habitat maps was assessed using total agreement, quantity disagreement, and allocation disagreement. Agreement in the unsupervised maps was assessed using the Cramer's V coefficient. Choice of input data produced large differences in the accuracy of the supervised maps, but did not have the same effect on the unsupervised maps. Accuracies were 46, 56, and 49% when calculated using the sample and 52, 65, and 51% when using an unbiased estimate of the population for the BS, BSDER, and DER maps, respectively. Cramer's V was 0.371, 0.417, and 0.366 for the BS, BSDER, and DER maps, respectively.

Holocene diatom biostratigraphy of the SW Gulf of Gdańsk, Southern Baltic Sea (part III)

2008 ◽  
Vol 37 (4) ◽  
Author(s):  
Małgorzata Leśniewska ◽  
Małgorzata Witak
Keyword(s):  
Baltic Sea ◽  
The South ◽  
Gulf Of Gdańsk ◽  
The Baltic Sea ◽  
Southern Baltic Sea ◽  
Gulf Of Gdansk ◽  
Southern Baltic ◽  
The Baltic ◽  
Palaeoenvironmental Changes

Holocene diatom biostratigraphy of the SW Gulf of Gdańsk, Southern Baltic Sea (part III)The palaeoenvironmental changes of the south-western part of the Gulf of Gdańsk during the last 8,000 years, with reference to the stages of the Baltic Sea, were reconstructed. Diatom analyses of two cores taken from the shallower and deeper parts of the basin enabled the conclusion to be drawn that the microflora studied developed in the three Baltic phases: Mastogloia, Littorina and Post-Littorina. Moreover, the so-called anthropogenic assemblage was observed in subbottom sediments of the study area.

Integrated Research of the Southern Baltic Sea during Cruise 42 of the R/V AkademikNikolaj Strakhov

Oceanology ◽  
2020 ◽  
Vol 60 (4) ◽  
pp. 565-566
Author(s):  
D. V. Dorokhov ◽  
V. T. Paka ◽  
A. A. Kondrashov ◽  
I. Yu. Dudkov ◽  
M. F. Markiyanova
Keyword(s):  
Baltic Sea ◽  
Southern Baltic Sea ◽  
Integrated Research ◽  
Southern Baltic

scholarly journals Argo floats in the southern Baltic Sea

Oceanologia ◽  
2020 ◽  
Vol 62 (4) ◽  
pp. 478-488
Author(s):  
Waldemar Walczowski ◽  
Małgorzata Merchel ◽  
Daniel Rak ◽  
Piotr Wieczorek ◽  
Ilona Goszczko
Keyword(s):  
Baltic Sea ◽  
Southern Baltic Sea ◽  
Argo Floats ◽  
Southern Baltic

Fish as a winter reservoir for Vibrio spp. in the southern Baltic Sea coast

2021 ◽  
pp. 103574
Author(s):  
Lars Möller ◽  
Bernd Kreikemeyer ◽  
Gunnar Gerdts ◽  
Günter Jost ◽  
Matthias Labrenz
Keyword(s):  
Baltic Sea ◽  
Southern Baltic Sea ◽  
Southern Baltic ◽  
Vibrio Spp ◽  
Sea Coast

scholarly journals The Effect of Abiotic Factors on Abundance and Photosynthetic Performance of Airborne Cyanobacteria and Microalgae Isolated from the Southern Baltic Sea Region

Cells ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 103
Author(s):  
Kinga Wiśniewska ◽  
Sylwia Śliwińska-Wilczewska ◽  
Anita Lewandowska ◽  
Marta Konik
Keyword(s):  
Baltic Sea ◽  
Abiotic Factors ◽  
Photosynthetic Performance ◽  
Culture Collection ◽  
Terrestrial Environment ◽  
Territorial Expansion ◽  
Southern Baltic Sea ◽  
Baltic Sea Region ◽  
Colonization Potential ◽  
Southern Baltic

Cyanobacteria and microalgae present in the aquatic or terrestrial environment may be emitted into the air and transported along with air masses over long distances. As a result of staying in the atmosphere, these organisms may develop a greater tolerance to stressful factors, but this topic is still relatively unknown. The main aim was to show an autecological characteristic of some airborne microalgae and cyanobacteria strains by a factorial laboratory experiment approach, including changes in irradiance, temperature, and salinity conditions. The additional purpose of this work was also to present part of the Culture Collection of Baltic Algae (CCBA) collection, which consists of airborne algae (AA) isolated from the atmospheric air of the southern Baltic Sea region. Altogether, 61 strains of airborne cyanobacteria and microalgae from the southern Baltic Sea region were isolated from May 2018 to August 2020. Selected microorganisms were tested in controlled laboratory conditions to identify their response to different irradiance (10–190 µmol photons m−2 s−1), temperature (13–23 °C), and salinity conditions (0–36 PSU). The highest numbers of cells (above 30 × 105 cell mL−1) were recorded for cyanobacterium Nostoc sp., and for diatoms Nitzschia sp., Amphora sp., and Halamphora sp. We found that for cyanobacterium Nostoc sp. as well as for green alga Coccomyxa sp. the maximum cell concentrations were recorded at the salinity of 0 PSU. Moreover, cyanobacteria Planktolyngbya contorta, Pseudanabaena catenata, Leptolyngbya foveolarum, Gloeocapsa sp., and Rivularia sp. were able to grow only at a salinity of 0 PSU. On the other hand, in the range of 16–24 PSU, the highest cell numbers of examined diatoms have been identified. Our research provided that deposited airborne microalgae and cyanobacteria showed full colonization potential. The present experiment suggests that the adaptive abilities of microorganisms, in particular those producing toxins, may contribute to the spread in the future. Thus, it may increase human exposure to their negative health effects. Any distinctive adaptations of the genera give them an additional competitive advantage and a greater chance for territorial expansion.

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