scholarly journals Long-term acoustic telemetry reveals limited movement of fish in an unregulated, perennial river

2021 ◽  
Author(s):  
Luke Carpenter-Bundhoo ◽  
Gavin L. Butler ◽  
Nick R. Bond ◽  
Stuart E. Bunn ◽  
Mark J. Kennard
Keyword(s):  
Acoustic Telemetry ◽  
Limited Movement

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

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.

Long‐term retention of acoustic telemetry transmitters in temperate predators revealed by predation tags implanted in wild prey fish

2019 ◽  
Vol 95 (6) ◽  
pp. 1512-1516 ◽  
Author(s):  
Natalie V. Klinard ◽  
Jordan K. Matley ◽  
Aaron T. Fisk ◽  
Timothy B. Johnson
Keyword(s):  
Acoustic Telemetry ◽  
Prey Fish ◽  
Term Retention ◽  
Long Term Retention

Testing a new acoustic telemetry technique to quantify long-term, fine-scale movements of aquatic animals

2011 ◽  
Vol 108 (2-3) ◽  
pp. 364-371 ◽  
Author(s):  
Mario Espinoza ◽  
Thomas J. Farrugia ◽  
Dale M. Webber ◽  
Frank Smith ◽  
Christopher G. Lowe
Keyword(s):  
Acoustic Telemetry ◽  
Fine Scale ◽  
Aquatic Animals

scholarly journals Evaluating methods for estimating mortality from acoustic telemetry data

2021 ◽  
Author(s):  
Lisa K. Peterson ◽  
Michael L Jones ◽  
Travis O. Brenden ◽  
Christopher S. Vandergoot ◽  
Charles C. Krueger
Keyword(s):  
Spatial Model ◽  
Acoustic Telemetry ◽  
Total Mortality ◽  
Absolute Error ◽  
Mortality Rates ◽  
Error Rates ◽  
Mortality Estimation ◽  
Accuracy And Precision ◽  
Evaluating Methods

Mortality rates are major determinants of long-term sustainability of exploited fish populations yet accurately estimating these rates can be challenging. We used simulations to evaluate a non-spatial and spatial modeling approach for estimating mortality rates from acoustic telemetry detection data. Data were generated assuming different receiver configurations (grids, lines), number of receivers, and mortality levels. Relative error rates for total mortality ranged from 0% to 83% for the non-spatial model and 1% to 141% for the spatial model. Absolute error rates ranged from 0.00 to 0.11 for the non-spatial model and 0.01 to 0.15 for the spatial model. Accuracy and precision in mortality estimates were sensitive to assumed mortality rates and receiver configurations; the high-density receiver grid resulted in the lowest error rates. Estimates were consistently positively biased. We recommend using grid receiver configurations for mortality rate estimation from acoustic telemetry studies. The potential for biased mortality estimation from acoustic telemetry detection data should be considered during study design, particularly for those species whose behavior and ecology may result in long periods of non-detection.

scholarly journals Detection range and efficiency of acoustic telemetry receivers in a connected wetland system

Hydrobiologia ◽  
2021 ◽  
Vol 848 (8) ◽  
pp. 1825-1836
Author(s):  
Emily R. Winter ◽  
Andrew M. Hindes ◽  
Steve Lane ◽  
J. Robert Britton
Keyword(s):  
Water Temperature ◽  
Acoustic Telemetry ◽  
Detection Efficiency ◽  
Acoustic Noise ◽  
Chlorophyll Concentration ◽  
Temperature Conductivity ◽  
Detection Range ◽  
Receiver Performance ◽  
Range Testing

AbstractAcoustic telemetry is an important tool for assessing the behavioural ecology of aquatic animals, but the performance of receivers can vary spatially and temporally according to changes in environmental gradients. Studies testing detection efficiency and/ or detection range are, therefore, important for data interpretation, although the most thorough range-testing approaches are often costly or impractical, such as the use of fixed sentinel tags. Here, stationary tag data (from study animals that had either died or expelled their tags) provided a substitute for the long-term monitoring of receiver performance in a wetland environment and was complemented by periodic boat-based range testing, with testing of the effects of environmental variables (water temperature, conductivity, transparency, precipitation, wind speed, acoustic noise) on detection efficiency (DE) and detection range (DR). Stationary tag DE was highly variable temporally, the most influential factors being water temperature and precipitation. Transparency was a strong predictor of DR and was dependent on chlorophyll concentration (a surrogate measure of algal density). These results highlight the value of stationary tag data in assessments of acoustic receiver performance. The high seasonal variability in DE and DR emphasises the need for long-term receiver monitoring to enable robust conclusions to be drawn from telemetry data.

scholarly journals Acoustic telemetry and network analysis reveal the space use of multiple reef predators and enhance marine protected area design

2016 ◽  
Vol 283 (1834) ◽  
pp. 20160717 ◽  
Author(s):  
James S. E. Lea ◽  
Nicolas E. Humphries ◽  
Rainer G. von Brandis ◽  
Christopher R. Clarke ◽  
David W. Sims
Keyword(s):  
Network Analysis ◽  
Acoustic Telemetry ◽  
Marine Protected Area ◽  
High Tide ◽  
Space Use ◽  
Scale Space ◽  
Turtle Species ◽  
Movement Data ◽  
Species Specific

Marine protected areas (MPAs) are commonly employed to protect ecosystems from threats like overfishing. Ideally, MPA design should incorporate movement data from multiple target species to ensure sufficient habitat is protected. We used long-term acoustic telemetry and network analysis to determine the fine-scale space use of five shark and one turtle species at a remote atoll in the Seychelles, Indian Ocean, and evaluate the efficacy of a proposed MPA. Results revealed strong, species-specific habitat use in both sharks and turtles, with corresponding variation in MPA use. Defining the MPA's boundary from the edge of the reef flat at low tide instead of the beach at high tide (the current best in Seychelles) significantly increased the MPA's coverage of predator movements by an average of 34%. Informed by these results, the larger MPA was adopted by the Seychelles government, demonstrating how telemetry data can improve shark spatial conservation by affecting policy directly.

A Long-term Deep-water Acoustic Telemetry Experiment

2005 ◽  
Author(s):  
L.E. Freitag ◽  
J.S. Merriam ◽  
D.E. Frye ◽  
J.A. Catipovic
Keyword(s):  
Deep Water ◽  
Acoustic Telemetry
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