Inter-annual decrease in pulse rate and peak frequency of Southeast Pacific blue whale song types

Fish produce sounds that are usually species-specific and associated with particular behaviors and contexts. Acoustic characterization enables the use of sounds as natural acoustic labels for species identification. Males of Prochilodus magdalenae produce mating sounds. We characterized these sounds and tested their use in natural habitats, to use passive acoustic monitoring for spawning ground identification. We identified two types of acoustic signals: simple pulses and pulse trains. Simple pulses were 13.7 ms long, with peak frequency of 365 Hz, whereas pulse train were 2.3 s long, had peak frequency of 399 Hz, 48.6 pulses and its pulses lasted 12.2 ms, with interpulse interval of 49.0 ms long and 22.3 Hz pulse rate. We did not detect spawning in absence of male calls nor differences in male sounds at different female densities. We found differences in train duration, pulse rate, and pulse duration in trains, according to the fish's source sites, but these sites were not well discriminated based on bioacoustical variables. In rivers, we located two P. magdalenae spawning grounds and recognized calls from another fish species (Megaleporinus muyscorum). We did not find a significant relationship between fish size and call peak frequency for P. magdalenae.

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Intraseasonal variation in southeast Pacific blue whale acoustic presence, zooplankton backscatter, and oceanographic variables on a feeding ground in Northern Chilean Patagonia

Progress In Oceanography ◽

10.1016/j.pocean.2021.102709 ◽

2021 ◽

pp. 102709

Author(s):

J. Buchan Susannah ◽

Pérez-Santos Iván ◽

Narváez Diego ◽

Castro Leonardo ◽

M. Stafford Kathleen ◽

...

Keyword(s):

Blue Whale ◽

Intraseasonal Variation ◽

Feeding Ground ◽

Chilean Patagonia ◽

Southeast Pacific ◽

Oceanographic Variables

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Southeast Pacific blue whale song recorded off Isla Chañaral, northern Chile

Marine Mammal Science ◽

10.1111/mms.12738 ◽

2020 ◽

Vol 36 (4) ◽

pp. 1339-1346

Author(s):

Julie Patris ◽

Susannah J. Buchan ◽

Giselle Alosilla ◽

Naysa Balcazar‐Cabrera ◽

Franck Malige ◽

...

Keyword(s):

Northern Chile ◽

Blue Whale ◽

Southeast Pacific

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Seasonal occurrence of southeast Pacific blue whale songs in southern Chile and the eastern tropical Pacific

Marine Mammal Science ◽

10.1111/mms.12173 ◽

2014 ◽

Vol 31 (2) ◽

pp. 440-458 ◽

Cited By ~ 20

Author(s):

Susannah J. Buchan ◽

Kathleen M. Stafford ◽

Rodrigo Hucke-Gaete

Keyword(s):

Tropical Pacific ◽

Seasonal Occurrence ◽

Southern Chile ◽

Eastern Tropical Pacific ◽

Blue Whale ◽

Southeast Pacific

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No effect of artificial gravity on lung function with exercise training during head-down bed rest

International Journal of Astrobiology ◽

10.1017/s1473550415000294 ◽

2015 ◽

pp. 1-7

Author(s):

Longxiang Su ◽

Yinghua Guo ◽

Yajuan Wang ◽

Delong Wang ◽

Changting Liu

Keyword(s):

Lung Function ◽

Pulse Rate ◽

Vital Capacity ◽

Pulmonary Ventilation ◽

Bed Rest ◽

Forced Expiratory Volume ◽

Observation Time ◽

Artificial Gravity ◽

Postural Changes ◽

Expiratory Flow

AbstractTo explore the effectiveness of microgravity simulated by head-down bed rest (HDBR) and artificial gravity (AG) with exercise on lung function. Twenty-four volunteers were randomly divided into control and exercise countermeasure (CM) groups for 96 h of 6° HDBR. Comparisons of pulse rate, pulse oxygen saturation (SpO2) and lung function were made between these two groups at 0, 24, 48, 72, 96 h. Compared with the sitting position, inspiratory capacity and respiratory reserve volume were significantly higher than before HDBR (0° position) (P< 0.05). Vital capacity, expiratory reserve volume, forced vital capacity, forced expiratory volume in 1 s, forced inspiratory vital capacity, forced inspiratory volume in 1 s, forced expiratory flow at 25, 50 and 75%, maximal mid-expiratory flow and peak expiratory flow were all significantly lower than those before HDBR (P< 0.05). Neither control nor CM groups showed significant differences in the pulse rate, SpO2, pulmonary volume and pulmonary ventilation function over the HDBR observation time. Postural changes can lead to variation in lung volume and ventilation function, but a HDBR model induced no changes in pulmonary function and therefore should not be used to study AG CMs.

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