Red hind Epinephelus guttatus Vocal Repertoire Characterization, Behavior and Temporal Patterns

Passive acoustic monitoring provides a method for studying grouper courtship associated sounds (CAS). For Red Hind (Epinephelus guttatus), this approach has documented spatio—temporal patterns in their spawning aggregations. This study described vocalizations produced by E. guttatus and their respective behavioral contexts in field and laboratory studies. Five sound types were identified, which included 4 calls recorded in captivity and one sound recorded in the wild, labeled as Chorus. Additionally, the Grunt call type recorded was presumed to be produced by a female. Call types consisted of variations and combinations of low frequency (50—450 Hz) pulses, grunts and tonal sounds in different combinations. Common call types exhibited diel and lunar oscillations during the spawning season, with both field and captive recordings peaking daily at 1800 AST and at 8 days after the full moon.

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Spatial and temporal patterns of movement and migration at spawning aggregations of red hind, Epinephelus guttatus, in the U.S. Virgin Islands

Environmental Biology of Fishes ◽

10.1007/s10641-006-9161-x ◽

2006 ◽

Vol 78 (4) ◽

pp. 365-381 ◽

Cited By ~ 68

Author(s):

Richard S. Nemeth ◽

Jeremiah Blondeau ◽

Steve Herzlieb ◽

Elizabeth Kadison

Keyword(s):

Temporal Patterns ◽

Virgin Islands ◽

Spatial And Temporal Patterns ◽

Spawning Aggregations ◽

Red Hind ◽

Epinephelus Guttatus ◽

And Migration ◽

The U.S

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Previously unknown behavior in parasitic cuckoo females: male-like vocalization during migratory activity

Avian Research ◽

10.1186/s40657-021-00246-9 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Swetlana G. Meshcheryagina ◽

Alexey Opaev

Keyword(s):

Vocal Communication ◽

Harmonic Spectrum ◽

Common Cuckoo ◽

Neck Extension ◽

Migratory Activity ◽

Call Production ◽

In Captivity ◽

In The Wild ◽

Combined Features ◽

Female Call

Abstract Background In the last decade, enigmatic male-like cuckoo calls have been reported several times in East Asia. These calls exhibited a combination of vocal traits of both Oriental Cuckoo (Cuculus optatus) and Common Cuckoo (Cuculus canorus) advertising calls, and some authors therefore suggested that the enigmatic calls were produced by either Common × Oriental Cuckoo male hybrids or Common Cuckoo males having a gene mutation. However, the exact identity of calling birds are still unknown. Methods We recorded previously unknown male-like calls from three captive Oriental Cuckoo females, and compared these calls with enigmatic vocalizations recorded in the wild as well as with advertising vocalizations of Common and Oriental Cuckoo males. To achieve this, we measured calls automatically. Besides, we video-recorded captive female emitting male-like calls, and compared these recordings with the YouTube recordings of calling males of both Common and Oriental Cuckoos to get insight into the mechanism of call production. Results The analysis showed that female male-like calls recorded in captivity were similar to enigmatic calls recorded in the wild. Therefore, Oriental Cuckoo females might produce the latter calls. Two features of these female calls appeared to be unusual among birds. First, females produced male-like calls at the time of spring and autumn migratory activity and on migration in the wild. Because of this, functional significance of this call remained puzzling. Secondly, the male-like female call unexpectedly combined features of both closed-mouth (closed beak and simultaneous inflation of the ‘throat sac’) and open-mouth (prominent harmonic spectrum and the maximum neck extension observed at the beginning of a sound) vocal behaviors. Conclusions The Cuculus vocalizations outside the reproductive season remain poorly understood. Here, we found for the first time that Oriental Cuckoo females can produce male-like calls in that time. Because of its rarity, this call might be an atavism. Indeed, female male-like vocalizations are still known in non-parasitic tropical and apparently more basal cuckoos only. Therefore, our findings may shed light on the evolution of vocal communication in avian brood parasites.

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On Proper Orthogonal Decomposition or K-L Expansion to Analyze Transient Sound Pressure Fields in Linear Acoustics

Noise Control and Acoustics ◽

10.1115/imece2003-41922 ◽

2003 ◽

Author(s):

Ioannis T. Georgiou ◽

Christos I. Papadopoulos

Keyword(s):

Proper Orthogonal Decomposition ◽

Sound Pressure ◽

Pressure Field ◽

Low Frequency ◽

Temporal Patterns ◽

Orthogonal Decomposition ◽

Noise Sources ◽

Air Cavity ◽

Spatio Temporal ◽

Proper Orthogonal

Identification of the most energetic spatio-temporal patterns that govern the low-frequency dynamics of an air cavity excited by noise sources could lead to significant design improvements of enclosures for noise reduction / isolation and / or sound quality. In this work we show how the Proper Orthogonal Decomposition (POD) method can be applied to identify optimum spatio-temporal patterns governing the dynamics of the sound pressure field developed inside an air cavity. The novel feature of this approach resides into the fact that the POD technique is utilized to process databases for acoustic variables produced by state of the art computational methods in acoustics, such as the finite element method. For a cavity with rigid walls and excited by a harmonic point source, the POD technique reveals that the sound pressure field is composed of a very small number of Proper Orthogonal Modes, which are unique since they are optimum by construction. The POD technique identifies the shapes or patterns of these modes.

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Long-Term Patterns of Noise From Underwater Explosions and Their Relation to Fisheries in Southern California

Frontiers in Marine Science ◽

10.3389/fmars.2021.796849 ◽

2021 ◽

Vol 8 ◽

Author(s):

Anna Krumpel ◽

Ally Rice ◽

Kaitlin E. Frasier ◽

Fairlie Reese ◽

Jennifer S. Trickey ◽

...

Keyword(s):

Southern California ◽

Temporal Patterns ◽

Purse Seine ◽

Economic Losses ◽

Negative Effects ◽

Underwater Explosions ◽

Marine Life ◽

Spatio Temporal ◽

Passive Acoustic

Acoustic deterrents can reduce marine mammal interactions with fisheries and aquacultures, but they contribute to an increasing level of underwater noise. In Southern California, commercially produced explosive deterrents, commonly known as “seal bombs,” are used to protect fishing gear and catch from pinniped predation, which can cause extensive economic losses for the fishing community. Passive acoustic monitoring data collected between 2005 and 2016 at multiple sites within the Southern California Bight and near Monterey Bay revealed high numbers of these small-charge underwater explosions, long-term, spatio-temporal patterns in their occurrence, and their relation to different commercial purse-seine fishing sectors. The vast majority of explosions occurred at nighttime and at many nearshore sites high explosion counts were detected, up to 2,800/day. Received sound exposure levels of up to 189 dB re 1 μPa2-s indicate the potential for negative effects on marine life, especially in combination with the persistence of recurring explosions during periods of peak occurrence. Due to the highly significant correlation and similar spatio-temporal patterns of market squid landings and explosion occurrence at many sites, we conclude that the majority of the recorded explosions come from seal bombs being used by the California market squid purse-seine fishery. Additionally, seal bomb use declined over the years of the study, potentially due to a combination of reduced availability of market squid driven by warm water events in California and regulation enforcement. This study is the first to provide results on the distribution and origin of underwater explosions off Southern California, but there is a substantial need for further research on seal bomb use in more recent years and their effects on marine life, as well as for establishing environmental regulations on their use as a deterrent.

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