ACOUSTIC BOTTOM CLASSIFICATION OF OYSTER HABITAT IN THE MULLICA RIVER ESTUARY

2019 ◽  
Author(s):  
Courtney Birdsall ◽  
◽  
Taylor Forster ◽  
Susanne Moskalski
Keyword(s):  
River Estuary ◽  
Bottom Classification

Inter-annual variability in otolith chemistry of catfish Genidens barbus from South-western Atlantic estuaries

2017 ◽  
Vol 98 (4) ◽  
pp. 855-865 ◽  
Author(s):  
Esteban Avigliano ◽  
Barbara Carvalho ◽  
Gonzalo Velasco ◽  
Pamela Tripodi ◽  
Alejandra Vanina Volpedo
Keyword(s):  
River Estuary ◽  
Patos Lagoon ◽  
Western Atlantic ◽  
Specific Chemical ◽  
Spatial Classification ◽  
Annual Variability ◽  
Chemical Signatures ◽  
Commercial Species ◽  
Otolith Core

The catfish Genidens barbus is a commercial species from South America. The aim of the present study was to examine the inter-annual variability in estuary-specific chemical signatures of otolith cores (Ba:Ca, Mg:Ca, Mn:Ca, Sr:Ca and Zn:Ca ratios) for three estuaries from Argentina and Brazil where adults were collected over multiple years. Secondarily, we evaluated whether the percentages of classification of individuals to their natal origin place are affected by the grouping of several cohorts. Most element:Ca ratios were not significantly different among year cohorts. Results from PERMANOVA revealed significant differences in the multi-element signatures of the otolith core between cohorts for the Plata River estuary (PR) (P = 0.006) and the Patos Lagoon (PL) (P = 0.03), while no significant differences (P = 0.9) were found for Paranaguá Bay (PB). The percentages of spatial classification (discriminant function analyses) decreased to between 15.5 and 25% for PR and PL when cohorts were grouped. This work makes it clear that the temporal variation in the chemical signature of the adult catfish otolith core can greatly affect the percentages of spatial classification.

scholarly journals Folk classification of the crabs and swimming crabs (Crustacea – Brachyura) of the Mamanguape river estuary, Northeastern – Brazil

2009 ◽  
Vol 5 (1) ◽  
Author(s):  
Emmanoela N Ferreira ◽  
José da S Mourão ◽  
Pollyana D Rocha ◽  
Douglas M Nascimento ◽  
Dandara Monalisa Mariz da S Q Bezerra
Keyword(s):  
River Estuary ◽  
Northeastern Brazil ◽  
Folk Classification ◽  
Swimming Crabs

The Sensitivity of Water Environmental Factors on Eutrophication Based on Rough Set Theory and the Ecological Countermeasures Revelation

2012 ◽  
Vol 531 ◽  
pp. 446-450
Author(s):  
Xian Xiang Luo ◽  
Juan Zhang ◽  
Long Jun Zhang
Keyword(s):  
Environmental Factors ◽  
Set Theory ◽  
Rough Set ◽  
Rough Set Theory ◽  
River Estuary ◽  
Laizhou Bay ◽  
Key Factors ◽  
Ecological Measurement ◽  
Xiaoqing River Estuary

The paper took advantage of approximate classification of imprecise or incomplete data to analyze and assess the sensitivity of environmental factors on eutrophication based on rough set theory. Its main advantage was it performed rationally on data attributes reduction and classification. This technique provided a valuable tool to analyze the key factors leading to eutrophication in Xiaoqing River estuary of Laizhou Bay in China. Results showed that the most important factors that dominated the eutrophic degree were aerobiotic organic compound, dissolved inorganic phosphate and nitrogen which came from the land-input of Xiaoqing River. Then the ecological measurement against eutrophication may be to cultivate a kind of ecological environment materials (e.g. seaweed) to absorb the excessive nutrition.

scholarly journals Influence of tides and winds on fishing techniques and strategies in the Mamanguape River Estuary, Paraíba State, NE Brazil

2012 ◽  
Vol 84 (3) ◽  
pp. 775-788 ◽  
Author(s):  
Dandara M.M. Bezerra ◽  
Douglas M. Nascimento ◽  
Emmanoela N. Ferreira ◽  
Pollyana D. Rocha ◽  
José S. Mourão
Keyword(s):  
Spring Tide ◽  
River Estuary ◽  
Northeastern Brazil ◽  
Essential Factor ◽  
Direct Observations ◽  
Fishing Strategies ◽  
Phases Of The Moon ◽  
Guided Tours ◽  
Management And Conservation

This work was carried out in two small fishing communities, Barra de Mamanguape and Tramataia, Northeastern Brazil. The aim was to study these traditional fishermen's knowledge and perception about tide and wind classifications, as well as their fishing strategies and techniques. Our research methodology involved various techniques: free interviews and semi-structured ones, guided tours and direct observations. The results obtained show the fishermen's classification of the tides according to the phases of the moon: 'breaking tide', 'flushing tide', 'dead tide' and 'big tide' designated technically these last as neap tide and spring tide, respectively. Wind is also an essential factor for the fishermen to make successful catches, and they classify it according to direction: North, South, East, Southeast, Southwest, Northeast and Northwest. The data show that fishermen's knowledge can also be useful in devising plans for management and conservation studies for this estuary.

Process-related classification of acoustic data from the Hudson River Estuary

2004 ◽  
Vol 209 (1-4) ◽  
pp. 131-145 ◽  
Author(s):  
Frank O. Nitsche ◽  
Robin Bell ◽  
Suzanne M. Carbotte ◽  
William B.F. Ryan ◽  
Roger Flood
Keyword(s):  
River Estuary ◽  
Hudson River ◽  
Hudson River Estuary ◽  
Acoustic Data

scholarly journals Measurement and Analysis of Acoustic Backscatter Value for Bottom Classification of waters Tidung Island

2021 ◽  
Vol 5 (2) ◽  
pp. 544-550
Author(s):  
M Hasbi Sidqi Alajuri ◽  
Henry M Manik ◽  
Sri Pujiyati
Keyword(s):  
Grain Size ◽  
Single Frequency ◽  
Acoustic Backscatter ◽  
Sediment Grain Size ◽  
Single Beam ◽  
Measurement And Analysis ◽  
Sediment Sampling ◽  
Backscattering Strength ◽  
Bottom Classification

Sediment in a water has an important role for organisms, namely as a habitat, a place for foraging for food, and a place for spawning. These sediment can affect the composition of organisms in the water. The purpose of this study is to calculate the value of acoustic backscatter for the classification of the bottom of the water and to see the effect of sediment grain size on the backscatter value obtained from a single beam acoustic instrument. Data collection was carried out from 10 to 12 June 2021 in the water of Tidung Island, Seribu Islands, using the SIMRAD EK-15 single beam, single frequency 200 kHz instrument. Sediment sampling was carried out at 13 stations. The results showed that the waters of Tidung Island were dominated by muddy substrate which was classified based on the Surface Backscattering Strength (SS) value. Meanwhile, the grain size of the sediment affects the SVb value, where the large the grain size of the bottom sediment, the SVb value will be higher. The higher SVb value the SS value will be higher. Keywords: Bottom Classification, Acoustic Backscatter, Tidung Island

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