Fish chorusing is a major component of the marine acoustic environment, and much of this chorusing activity happens at night. These nocturnal sounds are commonly associated with reproductive behavior. For many co-occurring taxa, increases in vocal activity may intensify acoustic competition
within a constrained signaling environment; for nocturnal species, there is a limited time window for these critical behaviors, and competition to be heard by conspecifics likely increases. Using passive acoustic recording units deployed in the nearshore waters off Georgia and eastern Florida,
we evaluated the nocturnal acoustic habits of fishes and examined how the sounds from nocturnal fish chorusing contribute to the overall soundscape. We examined long-term spectrograms for spatial and temporal patterns of fish calling. Black drum [Pogonias cromis (Linnaeus, 1766)] and
toadfish (Opsanus sp.) dominated the nocturnal acoustic scene, but calls of other identified [e.g., red drum, Sciaenops ocellatus (Linnaeus, 1766); silver perch, Bairdiella chrysoura (Lacépède, 1802)] and unidentified calling species also occur. We examined
the acoustic indices of entropy, acoustic diversity, and acoustic complexity to compare nocturnal and diurnal fish calling activity across the region. When sustained fish chorusing activity increases, entropy and acoustic diversity decrease, but acoustic complexity increases. With the acoustic
differences in composition of nocturnally- and diurnally-active species groups, there is a different nocturnal soundscape than during the day. Passive acoustic surveys represent an exciting approach to understand the nocturnal reproductive activity of coastal fishes.
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Document Type: Research Article
Bioacoustics Research Program, Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850;, Email: [email protected]
NOAA Southeast Fisheries Science Center, Miami, Florida 33149
April 1, 2017
This article was made available online on March 22, 2017 as a Fast Track article with title: "Nocturnal patterns in fish chorusing off the coasts of Georgia and eastern Florida".
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The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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