Large-scale passive acoustic monitoring of fish sound production on the West Florida Shelf

2013 ◽  
Vol 484 ◽  
pp. 173-188 ◽  
Author(s):  
CC Wall ◽  
P Simard ◽  
C Lembke ◽  
DA Mann
2015 ◽  
Vol 41 (2) ◽  
pp. 167-187 ◽  
Author(s):  
Peter Simard ◽  
Carrie C. Wall ◽  
Jason B. Allen ◽  
Randall S. Wells ◽  
Shannon Gowans ◽  
...  

2011 ◽  
Vol 12 (2) ◽  
pp. 97-108 ◽  
Author(s):  
MD Nelson ◽  
CC Koenig ◽  
FC Coleman ◽  
DA Mann

2020 ◽  
Vol 43 ◽  
pp. 475-494
Author(s):  
FW Shabangu ◽  
RK Andrew

Knowledge of cetacean occurrence and behaviour in southern African waters is limited, and passive acoustic monitoring has the potential to address this gap efficiently. Seasonal acoustic occurrence and diel-vocalizing patterns of sperm whales in relation to environmental conditions are described here using passive acoustic monitoring data collected off the west coast of South Africa. Four autonomous acoustic recorders (AARs) were deployed on 3 oceanographic moorings from July 2014 to January 2017. Sperm whale clicks were detected year round in most recording sites, with peaks in acoustic occurrence in summer and late winter through spring. Diel-vocalizing patterns were detected in winter, spring and summer. Higher percentages of sperm whale clicks were recorded by AARs deployed at 1100 m water depth compared to those concurrently deployed at 850 and 4500 m, likely inferring that the whales exhibited some preference to water depths around 1100 m. Acoustic propagation modelling suggested a maximum detection range of 83 km in winter for sperm whale clicks produced at 1100 m. Random forest models classified daylight regime, sea surface height anomaly and month of the year as the most important predictors of sperm whale acoustic occurrence. The continuous acoustic occurrence of sperm whales suggests that the study area supports large biomasses of prey to sustain this species’ food requirements year round. This is the first study to describe the seasonal acoustic occurrence and diel-vocalizing patterns of sperm whales off the west coast of South Africa, extending knowledge of the species previously available only through whaling records.


2011 ◽  
Vol 130 (4) ◽  
pp. 2498-2498
Author(s):  
Carrie C. Wall ◽  
Michael Lindemuth ◽  
Peter Simard ◽  
David A. Mann

2019 ◽  
Vol 146 (4) ◽  
pp. 2855-2855
Author(s):  
Goldie Phillips ◽  
Gerald L. D'Spain ◽  
Catalina López-Sagástegui ◽  
Daniel Guevara ◽  
Miguel Angel Cisneros-Mata ◽  
...  

2009 ◽  
Vol 39 (7) ◽  
pp. 1743-1755 ◽  
Author(s):  
F. J. Beron-Vera ◽  
M. J. Olascoaga

Abstract Application of dynamical systems tools has recently revealed in surface ocean currents produced by a Hybrid-Coordinate Ocean Model (HYCOM) simulation the presence of a persistent large-scale Lagrangian coherent structure (LCS) on the southern portion of the west Florida shelf (WFS). Consistent with satellite-tracked drifter trajectories, this LCS constitutes a cross-shelf barrier for the lateral transport of passive tracers. Because of the constraints that the above LCS, as well as smaller-scale LCSs lying shoreside, can impose on pollutant dispersal and its potentially very important biological consequences, a study was carried out on the nature of the surface ocean Lagrangian motion on the WFS. The analysis is based on the same simulated surface ocean velocity field that has been able to sustain the aforementioned persistent cross-shelf transport barrier. Examination of several diagnostics suggests that chaotic stirring dominates over turbulent mixing on time scales of up to two months or so. More specifically, it is found on those time scales that tracer evolution at a given length scale is governed to a nonnegligible extent by coarser-scale velocity field features, fluid particle dispersion is spatially inhomogeneous, and the Lagrangian evolution is more irregular than the driving Eulerian flow.


Sign in / Sign up

Export Citation Format

Share Document