Examination of behavioral response of wild river herring to sonar signals using acoustic telemetry

Joseph Iafrate; Stephanie L. Watwood; Jessica Kutcher; Georges Dossot

doi:10.1121/1.5014511

Examination of behavioral response of wild river herring to sonar signals using acoustic telemetry

The Journal of the Acoustical Society of America ◽

10.1121/1.5014511 ◽

2017 ◽

Vol 142 (4) ◽

pp. 2597-2597

Author(s):

Joseph Iafrate ◽

Stephanie L. Watwood ◽

Jessica Kutcher ◽

Georges Dossot

Keyword(s):

Behavioral Response ◽

Acoustic Telemetry ◽

River Herring

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Using acoustic telemetry to observe the effects of a groundfish predator (Atlantic cod, Gadus morhua) on movement of the American lobster (Homarus americanus)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2013-0065 ◽

2013 ◽

Vol 70 (11) ◽

pp. 1625-1634 ◽

Cited By ~ 20

Author(s):

Marissa D. McMahan ◽

Damian C. Brady ◽

Diane F. Cowan ◽

Jonathan H. Grabowski ◽

Graham D. Sherwood

Keyword(s):

Home Range ◽

Behavioral Response ◽

Acoustic Telemetry ◽

Gadus Morhua ◽

Gulf Of Maine ◽

Atlantic Cod ◽

Homarus Americanus ◽

American Lobster ◽

Habitat Area ◽

Predation Rates

American lobster (Homarus americanus) landings have more than quadrupled in the last two decades (1990–2010), coinciding with the collapse of Gulf of Maine groundfish fisheries such as Atlantic cod (Gadus morhua). Recently there has been speculation that the release of lobster from predatory control may have resulted in both lower predation rates and increased foraging areas. We used fine-scale acoustic telemetry within a 200 m × 250 m field enclosure to test the hypothesis that cod induce lobsters to decrease movement and seek refuge. We found a large amount of variation in the behavioral response of individual lobsters to predators; however, the addition of cod into the enclosure reduced maximum daily home range area and significantly reduced the distance traveled from shelter habitat area for all individuals. When predators were removed from the enclosure, lobsters responded by increasing home range area and significantly increasing the distance traveled from shelter habitat area. These results represent the first experimental evidence for American lobster range contraction and subsequent expansion in the presence and absence of cod, respectively.

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Long-term monitoring provides insight into estuarine top predator (Carcharhinus leucas) resilience following an extreme weather event

Marine Ecology Progress Series ◽

10.3354/meps13269 ◽

2020 ◽

Vol 639 ◽

pp. 169-183

Author(s):

P Matich ◽

BA Strickland ◽

MR Heithaus

Keyword(s):

Habitat Use ◽

Acoustic Telemetry ◽

South Florida ◽

Behavioral Variability ◽

Catch Per Unit Effort ◽

Ontogenetic Shifts ◽

Carcharhinus Leucas ◽

Acute Disturbance ◽

Cold Snap

Chronic environmental change threatens biodiversity, but acute disturbance events present more rapid and immediate threats. In 2010, a cold snap across south Florida had wide-ranging impacts, including negative effects on recreational fisheries, agriculture, and ecological communities. Here, we use acoustic telemetry and historical longline monitoring to assess the long-term implications of this event on juvenile bull sharks Carcharhinus leucas in the Florida Everglades. Despite the loss of virtually all individuals (ca. 90%) within the Shark River Estuary during the cold snap, the catch per unit effort (CPUE) of age 0 sharks on longlines recovered through recruitment within 6-8 mo of the event. Acoustic telemetry revealed that habitat use patterns of age 0-2 sharks reached an equilibrium in 4-6 yr. In contrast, the CPUE and habitat use of age 3 sharks required 5-7 yr to resemble pre-cold snap patterns. Environmental conditions and predation risk returned to previous levels within 1 yr of the cold snap, but abundances of some prey species remained depressed for several years. Reduced prey availability may have altered the profitability of some microhabitats after the cold snap, leading to more rapid ontogenetic shifts to marine waters among sharks for several years. Accelerated ontogenetic shifts coupled with inter-individual behavioral variability of bull sharks likely led to a slower recovery rate than predicted based on overall shark CPUE. While intrinsic variation driven by stochasticity in dynamic ecosystems may increase the resistance of species to chronic and acute disturbance, it may also increase recovery time in filling the diversity of niches occupied prior to disturbance if resistive capacity is exceeded.

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