scholarly journals Underwater hearing and communication in the endangered Hawaiian monk seal Neomonachus schauinslandi

2020 ◽  
Author(s):  
JM Sills ◽  
K Parnell ◽  
B Ruscher ◽  
C Lew ◽  
TL Kendall ◽  
...  
Keyword(s):  
Hawaiian Monk Seal ◽  
Underwater Hearing

Status of the Hawaiian monk seal (Monachus schauinslandi) population

1995 ◽  
Vol 73 (6) ◽  
pp. 1185-1190 ◽  
Author(s):  
W. G. Gilmartin ◽  
L. L. Eberhardt
Keyword(s):  
Complex System ◽  
Sex Ratios ◽  
Current Trend ◽  
Survival Rates ◽  
Hawaiian Monk Seal ◽  
Monachus Schauinslandi ◽  
Young Females ◽  
Adult Females ◽  
Unknown Factor ◽  
Adult Sex Ratio

Restoration of the Hawaiian monk seal (Monachus schauinslandi) population to its former abundance poses a number of problems in managing a complex system. Sharp differences in history and current trend exist among the six major pupping sites. A severely unbalanced adult sex ratio has resulted in deaths from "mobbing" of estrus females at two sites. Some unknown factor apparently severely reduced the numbers of females at three of the sites and thus produced the observed excess of males. Sex ratios subsequently decreased, but losses of adult females continue at two sites. A simple model indicates that sex ratios at the two sites where mobbing is a problem would require more than 10 years to approach an equilibrium value. Data on trends from counts are compared with estimates from reproduction and survival rates and agree closely except at one site (Kure Atoll), where introductions of young females have been made.

Underwater Hearing in the Frog, Rana Catesbeiana

1981 ◽  
Vol 91 (1) ◽  
pp. 57-71 ◽  
Author(s):  
R. ERIC LOMBARD ◽  
RICHARD R. FAY ◽  
YEHUDAH L. WERNER
Keyword(s):  
Sound Pressure ◽  
Rana Catesbeiana ◽  
Sound Intensity ◽  
Torus Semicircularis ◽  
Intensity Level ◽  
Hearing Thresholds ◽  
Average Loss ◽  
Two Measures ◽  
Underwater Hearing ◽  
Hearing Abilities

Comparable auditory sound pressure level (SPL) and sound intensity level(SIL) threshold curves were determined in air and under water in Ranacatesbeiana. Threshold curves were determined using chronic metal electrodeimplants which detected multi-unit responses of the torus semicircularis toincident sound. In terms of SPL, hearing thresholds in water and air aresimilar below 0.2 kHz. Above 0.2 kHz, the sensitivity under water falls of fat about 16 dB/octave to reach an average loss of about 30 dB above 0.4 kHz. In terms of SIL, the organism is about 30 dB more sensitive under water than in air below 0.2 kHz and equally sensitive in air and water above 0.4 kHz.The relative merits of the two measures are discussed and an attempt is made to relate the results to morphology of the middle and inner ears. This report is the first to compare aerial and underwater hearing abilities in any organism using electrode implants.

scholarly journals Extremely Low Genetic Diversity in the Endangered Hawaiian Monk Seal (Monachus schauinslandi)

2008 ◽  
Vol 100 (1) ◽  
pp. 25-33 ◽  
Author(s):  
J. K. Schultz ◽  
J. D. Baker ◽  
R. J. Toonen ◽  
B. W. Bowen
Keyword(s):  
Genetic Diversity ◽  
Hawaiian Monk Seal ◽  
Monachus Schauinslandi ◽  
Low Genetic Diversity

Organochlorines in the free-ranging Hawaiian monk seal (Monachus schauinslandi) from French Frigate Shoals, North Pacific Ocean

2004 ◽  
Vol 322 (1-3) ◽  
pp. 81-93 ◽  
Author(s):  
Maia K Willcox ◽  
Lee Ann Woodward ◽  
Gina M Ylitalo ◽  
Jon Buzitis ◽  
Shannon Atkinson ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Hawaiian Monk Seal ◽  
Monachus Schauinslandi ◽  
Free Ranging

Paucity of class I MHC gene heterogeneity between individuals in the endangered Hawaiian monk seal population

2006 ◽  
Vol 58 (2-3) ◽  
pp. 203-215 ◽  
Author(s):  
Brian M. Aldridge ◽  
Lizabeth Bowen ◽  
Brett R. Smith ◽  
George A. Antonelis ◽  
Frances Gulland ◽  
...  
Keyword(s):  
Class I ◽  
Class I Mhc ◽  
Hawaiian Monk Seal ◽  
Seal Population
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