Mortality rates for two shark species occupying a shared coastal environment

Knip, Danielle M.; Heupel, Michelle R.; Simpfendorfer, Colin A.

doi:10.1016/j.fishres.2012.02.023

Cited by 27 publications

(13 citation statements)

References 25 publications

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“…; Huusko & Hyvärinen ; Knip et al . ). Since the stability, resistance and resilience of populations vary among natural and disturbed systems (Wagner & Schmidt ), information gathered over long periods of time may allow natural changes in ecosystems to be separated from anthropogenic impacts (Voelz et al .…”

Section: Introductionmentioning

confidence: 97%

Long‐term demographic and reproductive trends in Ciona intestinalis sp. A

et al. 2014

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Ciona intestinalis sp. A (Tunicata, Ascidiacea) is a marine invertebrate with a widespread distribution and high invasive potential, yet little is known about its ecology. Here, the macrodynamics of demographic and reproductive trends were first determined using archive data covering 2002–2012. Species abundance in the central Tyrrhenian Sea (Campania, Italy ‐ NW Mediterranean) displayed Poisson distribution across 2002–2008, massive die‐off in 2009/2010 and population recovery in 2011/2012. We defined the seasonal ranges of sea surface temperature in which sampling size, animal size and reproductive status reached their highest values. In 2003/2004, self and non‐self fertilization appeared to follow reverse trends across the year. The long‐term recording run here on Ciona intestinalis sp. A provides novel insights into its population biology and ecology, and represents a valuable tool for sampling management and research planning.

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Section: Introductionmentioning

confidence: 97%

Long‐term demographic and reproductive trends in Ciona intestinalis sp. A

et al. 2014

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“…Here, we demonstrated how random walks simulating aquatic animal movements in an acoustic telemetry receiver grid compared with three fish species from two different large lake systems. The results have prompted spatially extensive application of two‐dimensional telemetry grid sampling in Lake Erie (http://glatos.glos.us/map) and bolster outcomes of previous smaller scale studies (Collins, Heupel, & Motta, ; Dance & Rooker, ; Heupel, Semmens, et al., ; Heupel, Simpfendorfer, et al., ; Knip et al., , ). We are hopeful that other researchers will see utility in our simulations, and respond with a more rigorous quantitative approach to autonomous receiver sampling.…”

Section: Discussionmentioning

confidence: 68%

“…elasmobranchs) as well as highly resident (e.g. reef teleosts) species in a variety of semi‐enclosed and open coastal marine ecosystems (Heupel & Simpfendorfer, , ; Knip, Heupel, & Simpfendorfer, ; Topping & Szedlmayer, , ).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of acoustic telemetry grids for determining aquatic animal movement and survival

et al. 2018

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Acoustic telemetry studies have frequently prioritized linear configurations of hydrophone receivers, such as perpendicular from shorelines or across rivers, to detect the presence of tagged aquatic animals. This approach introduces unknown bias when receivers are stationed for convenience at geographic bottlenecks (e.g. at the mouth of an embayment or between islands) as opposed to deployments following a statistical sampling design. We evaluated two‐dimensional acoustic receiver arrays (grids: receivers spread uniformly across space) as an alternative approach to provide estimates of survival, movement and habitat use. Performance of variably spaced receiver grids (5–25 km spacing) was evaluated by simulating (1) animal tracks as correlated random walks (speed: 0.1–0.9 m/s; turning angle SD: 5–30°); (2) variable tag transmission intervals along each track (nominal delay: 15–300 s); and (3) probability of detection of each transmission based on logistic detection range curves (mid‐point: 200–1,500 m). From simulations, we quantified (i) time between successive detections on any receiver (detection time), (ii) time between successive detections on different receivers (transit time), and (iii) distance between successive detections on different receivers (transit distance). In the most restrictive detection range scenario (200 m), the 95th percentile of transit time was 3.2 days at 5 km, 5.7 days at 7 km and 15.2 days at 25 km grid spacing; for the 1,500 m detection range scenario, it was 0.1 days at 5 km, 0.5 days at 7 km and 10.8 days at 25 km. These values represented upper bounds on the expected maximum time that an animal could go undetected. Comparison of the simulations with pilot studies on three fishes (walleye Sander vitreus, common carp Cyprinus carpio and channel catfish Ictalurus punctatus) from two independent large lake ecosystems (lakes Erie and Winnipeg) revealed shorter detection and transit times than what simulations predicted. By spreading effort uniformly across space, grids can improve understanding of fish migration over the commonly employed receiver line approach, but at increased time cost for maintaining grids.

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“…In contrast, direct estimation techniques such as telemetry (Heupel and Simpfendorfer , Knip et al. ), mark and recapture (Harry et al. ), and catch curves (Simpfendorfer , Coelho et al.…”

Section: Discussionmentioning

confidence: 99%

Refining mortality estimates in shark demographic analyses: a Bayesian inverse matrix approach

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Punt

Espinoza

et al. 2018

Ecological Applications

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Leslie matrix models are an important analysis tool in conservation biology that are applied to a diversity of taxa. The standard approach estimates the finite rate of population growth (λ) from a set of vital rates. In some instances, an estimate of λ is available, but the vital rates are poorly understood and can be solved for using an inverse matrix approach. However, these approaches are rarely attempted due to prerequisites of information on the structure of age or stage classes. This study addressed this issue by using a combination of Monte Carlo simulations and the sample-importance-resampling (SIR) algorithm to solve the inverse matrix problem without data on population structure. This approach was applied to the grey reef shark (Carcharhinus amblyrhynchos) from the Great Barrier Reef (GBR) in Australia to determine the demography of this population. Additionally, these outputs were applied to another heavily fished population from Papua New Guinea (PNG) that requires estimates of λ for fisheries management. The SIR analysis determined that natural mortality (M) and total mortality (Z) based on indirect methods have previously been overestimated for C. amblyrhynchos, leading to an underestimated λ. Updated distributions of Z and λ were produced for the GBR population and corrected obvious error in the demographic parameters for the PNG population. This approach provides opportunity for the inverse matrix approach to be applied more broadly to situations where information on population structure is lacking.

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Mortality rates for two shark species occupying a shared coastal environment

Cited by 27 publications

References 25 publications

Long‐term demographic and reproductive trends in Ciona intestinalis sp. A

Long‐term demographic and reproductive trends in Ciona intestinalis sp. A

Evaluation of acoustic telemetry grids for determining aquatic animal movement and survival

Refining mortality estimates in shark demographic analyses: a Bayesian inverse matrix approach

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