Observations on the abundance and behavior of marine mammals exposed to the Heard Island source transmissions.

1991 ◽  
Vol 90 (4) ◽  
pp. 2329-2330
Author(s):  
Ann E. Bowles ◽  
Mari Smultea ◽  
Bernd Würsig ◽  
Douglas P. DeMaster ◽  
Debra Palka
Keyword(s):  
Marine Mammals ◽  
Heard Island ◽  
And Behavior

Relative abundance and behavior of marine mammals exposed to transmissions from the Heard Island Feasibility Test

1994 ◽  
Vol 96 (4) ◽  
pp. 2469-2484 ◽  
Author(s):  
Ann E. Bowles ◽  
Mari Smultea ◽  
Bernd Würsig ◽  
Douglas P. DeMaster ◽  
Debra Palka
Keyword(s):  
Relative Abundance ◽  
Marine Mammals ◽  
Heard Island ◽  
Feasibility Test ◽  
And Behavior

Potential Effects of Low Frequency Sounds on Distribution and Behavior of Marine Mammals

2000 ◽  
Author(s):  
Christopher W. Clark ◽  
Daniel P. Costa ◽  
Walter H. Munk
Keyword(s):  
Marine Mammals ◽  
Low Frequency ◽  
And Behavior

scholarly journals The diving physiology of bottlenose dolphins (Tursiops truncatus). II. Biomechanics and changes in buoyancy at depth

1999 ◽  
Vol 202 (20) ◽  
pp. 2749-2761 ◽  
Author(s):  
R.C. Skrovan ◽  
T.M. Williams ◽  
P.S. Berry ◽  
P.W. Moore ◽  
R.W. Davis
Keyword(s):  
Tursiops Truncatus ◽  
Marine Mammals ◽  
Bottlenose Dolphins ◽  
Neutral Buoyancy ◽  
Swimming Mode ◽  
Locomotor Patterns ◽  
The Cost ◽  
Physical Changes ◽  
And Behavior ◽  
Limited Oxygen

During diving, marine mammals must balance the conservation of limited oxygen reserves with the metabolic costs of swimming exercise. As a result, energetically efficient modes of locomotion provide an advantage during periods of submergence and will presumably increase in importance as the animals perform progressively longer dives. To determine the effect of a limited oxygen supply on locomotor performance, we compared the kinematics and behavior of swimming and diving bottlenose dolphins. Adult bottlenose dolphins (Tursiops truncatus) were trained to swim horizontally near the water surface or submerged at 5 m and to dive to depths ranging from 12 to 112 m. Swimming kinematics (preferred swimming mode, stroke frequency and duration of glides) were monitored using submersible video cameras (Sony Hi-8) held by SCUBA divers or attached to a pack on the dorsal fin of the animal. Drag and buoyant forces were calculated from patterns of deceleration for horizontally swimming and vertically diving animals. The results showed that dolphins used a variety of swimming gaits that correlated with acceleration. The percentage of time spent gliding during the descent phase of dives increased with depth. Glide distances ranged from 7.1+/−1.9 m for 16 m dives to 43.6+/−7.0 m (means +/− s.e.m.) for 100 m dives. These gliding patterns were attributed to changes in buoyancy associated with lung compression at depth. By incorporating prolonged glide periods, the bottlenose dolphin realized a theoretical 10–21 % energetic savings in the cost of a 100 m dive in comparison with dives based on neutral buoyancy models. Thus, modifying locomotor patterns to account for physical changes with depth appears to be one mechanism that enables diving mammals with limited oxygen stores to extend the duration of a dive.

scholarly journals Studies on ecosystems of theArctic: Proceedings of the XXXVII Conference for Young Scientists at MMBI KSC RAS

2019 ◽  
Author(s):  
Keyword(s):  
Species Composition ◽  
Marine Mammals ◽  
Brown Seaweed ◽  
State University ◽  
Benthic Organisms ◽  
State Technical ◽  
Arctic State ◽  
Species Composition And Distribution ◽  
And Behavior ◽  
Sedimentation Processes

This publication contains papers submitted by young scientists at MMBI KSC RAS and their colleagues at the Murmansk Arctic State University and Murmansk State Technical University. The papers are devoted to hydrological and hydrochemical processes, sedimentation processes, spread of man-caused radionuclides, species composition and distribution of benthic organisms, physiology of brown seaweed, and behavior of marine mammals.

How Homo economicus lost her mind and how we can revive her

2018 ◽  
Vol 41 ◽  
Author(s):  
Peter DeScioli
Keyword(s):  
Economic Thought ◽  
History Of Economic Thought ◽  
Homo Economicus ◽  
Economic Theories ◽  
Target Article ◽  
History Of ◽  
The Mind ◽  
And Behavior

AbstractThe target article by Boyer & Petersen (B&P) contributes a vital message: that people have folk economic theories that shape their thoughts and behavior in the marketplace. This message is all the more important because, in the history of economic thought, Homo economicus was increasingly stripped of mental capacities. Intuitive theories can help restore the mind of Homo economicus.

The parent-offspring microbiome and neurobehavioral development

2019 ◽  
Vol 42 ◽  
Author(s):  
Jeffrey R. Alberts ◽  
Christopher Harshaw ◽  
Gregory E. Demas ◽  
Cara L. Wellman ◽  
Ardythe L. Morrow
Keyword(s):  
Mammalian Species ◽  
Social Emotional ◽  
Behavioral Measures ◽  
Neurobehavioral Development ◽  
Emotional Function ◽  
Neurobehavioral Outcomes ◽  
Methodological Approaches ◽  
And Behavior

Abstract We identify the significance and typical requirements of developmental analyses of the microbiome-gut-brain (MGB) in parents, offspring, and parent-offspring relations, which have particular importance for neurobehavioral outcomes in mammalian species, including humans. We call for a focus on behavioral measures of social-emotional function. Methodological approaches to interpreting relations between the microbiota and behavior are discussed.

TEM evaluation of graded SixGe1-x heterolayers

1991 ◽  
Vol 49 ◽  
pp. 894-895
Author(s):  
N. David Theodore ◽  
Mamoru Tomozane ◽  
Ming Liaw
Keyword(s):  
Heterojunction Bipolar Transistors ◽  
Gas Flow ◽  
Field Effect Transistors ◽  
Chemical Vapor ◽  
Dark Field ◽  
Bipolar Transistors ◽  
Structural Quality ◽  
Weak Beam ◽  
Transmission Electron ◽  
And Behavior

There is extensive interest in SiGe for use in heterojunction bipolar transistors. SiGe/Si superlattices are also of interest because of their potential for use in infrared detectors and field-effect transistors. The processing required for these materials is quite compatible with existing silicon technology. However, before SiGe can be used extensively for devices, there is a need to understand and then control the origin and behavior of defects in the materials. The present study was aimed at investigating the structural quality of, and the behavior of defects in, graded SiGe layers grown by chemical vapor deposition (CVD).The structures investigated in this study consisted of Si1-xGex[x=0.16]/Si1-xGex[x= 0.14, 0.13, 0.12, 0.10, 0.09, 0.07, 0.05, 0.04, 0.005, 0]/epi-Si/substrate heterolayers grown by CVD. The Si1-xGex layers were isochronally grown [t = 0.4 minutes per layer], with gas-flow rates being adjusted to control composition. Cross-section TEM specimens were prepared in the 110 geometry. These were then analyzed using two-beam bright-field, dark-field and weak-beam images. A JEOL JEM 200CX transmission electron microscope was used, operating at 200 kV.

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