scholarly journals Ontogenetic changes in depth distribution of juvenile flatfishes in relation to predation risk and temperature on a shallow-water nursery ground

2002 ◽  
Vol 229 ◽  
pp. 233-244 ◽  
Author(s):  
RN Gibson ◽  
L Robb ◽  
H Wennhage ◽  
MT Burrows
Keyword(s):  
Shallow Water ◽  
Predation Risk ◽  
Depth Distribution ◽  
Nursery Ground ◽  
Ontogenetic Changes

Reproductive bionomics of some shallow-water lysianassoids in the Saint Lawrence Estuary, with a review on the fecundity of the Lysianassoidea (Crustacea, Amphipoda)

1990 ◽  
Vol 68 (8) ◽  
pp. 1639-1644 ◽  
Author(s):  
Bernard Sainte-Marie ◽  
Gabriel Lamarche ◽  
Jean-Marc Gagnon
Keyword(s):  
Life History ◽  
High Risk ◽  
Shallow Water ◽  
Embryo Development ◽  
Ontogenetic Changes ◽  
Lawrence Estuary ◽  
Behavioural Changes ◽  
Living Species

The life history and fecundity of five shallow-water lysianassoids from the Saint Lawrence Estuary were examined. Orchomenella minuta and Or. pinguis are annual and iteroparous (two broods), Psammonyx terranovae is iteroparous (two broods) and probably biennial, and Anonyx sarsi and Onisimus litoralis are biennial and semelparous. Females of A. sarsi and On. litoralis cease feeding on bait shortly before or after oviposition, whereas females of the iteroparous Or. pinguis stop feeding on bait only when broods are in the latest stages of embryo development. These ontogenetic changes may result from gut constriction caused by developing ovaries and broods, or may be due to behavioural changes. Data on the fecundity of the Lysianassoidea are reviewed, and it is concluded that deep-living species are probably much less fecund than shallow-living species. Anonyx nugax, Or. pinguis, and A. sarsi are more fecund than other lysianassoids, possibly because of their high-risk carrion-feeding and suprabenthic foraging activities.

scholarly journals Nonlinear edge waves and shallow-water theory

1976 ◽  
Vol 74 (2) ◽  
pp. 369-374 ◽  
Author(s):  
A. A. Minzoni
Keyword(s):  
Shallow Water ◽  
Nonlinear Theory ◽  
Qualitative Agreement ◽  
Depth Distribution ◽  
Nonlinear Effects ◽  
Edge Waves ◽  
Shallow Water Theory ◽  
Water Edge ◽  
Constant Slope

Nonlinear effects are considered for shallow-water edge waves on beaches with a general depth distribution. The case of uniform depth away from the shoreline is considered in detail. It is shown that the results obtained are in qualitative agreement with those obtained by Whitham (1976) using the full nonlinear theory for a beach of constant slope.

NUMERICAL SIMULATION ON SEARCHING THE OPTIMUM SOURCE-DEPTH DISTRIBUTION FOR REVERBERATION INVERSION BY SIMULATED ANNEALING

2009 ◽  
Vol 17 (02) ◽  
pp. 197-209 ◽  
Author(s):  
JINRONG WU ◽  
E. C. SHAN ◽  
TIANFU GAO ◽  
LI MA
Keyword(s):  
Numerical Simulation ◽  
Simulated Annealing ◽  
Shallow Water ◽  
Depth Distribution ◽  
Strong Stability ◽  
Scattering Matrix ◽  
Source Depth ◽  
Back Scattering ◽  
Long Time ◽  
Pekeris Waveguide

To extract the intrinsic bottom back-scattering information from the reverberation data in shallow water has been a challenge topic for long time. It is shown that the modal back-scattering matrix (MBSM) is the intrinsic description of the bottom scattering.1 The optimum source-depth distribution for inverting MBSM from the reverberation data has been discussed with a Pekeris waveguide.2 In the present work, we extend the procedure to the general case of non-Pekeris waveguide by using the simulated annealing (SA) approach. Numerical simulated examples on searching the optimum source-depth distribution for MBSM inversion are presented. It is shown that: (1) the SA is an effective approach for searching the optimum source-depth distribution for MBSM inversion (2) the MBSM inverted from the optimal source-depth distribution has the strong stability against noise.

Sign in / Sign up

Export Citation Format

Share Document