Determining the effects of species, environmental conditions and tracking method on the detection efficiency of portable PIT telemetry

Cucherousset, Julien; Britton, J. Robert; Beaumont, W. R. C.; Nyqvist, Marina J.; Sievers, Katherine T.; Gozlan, Rodolphe E.

doi:10.1111/j.1095-8649.2010.02543.x

Cited by 32 publications

(66 citation statements)

References 25 publications

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“…Each tracking survey comprised of tracking of tagged fish using a portable PIT antenna system, as per Roussel, Haro, and Cunjak () and Cucherousset et al. (). The detection range of the antenna, measured as the distance between the plane of the antenna loop and the tag, varied with tag orientation, ranging from 55 cm when the tag was horizontal to 85 cm when the tag was vertical.…”

Section: Methodsmentioning

confidence: 99%

Relationships between individual movement, trophic position and growth of juvenile pike (Esox lucius)

Nyqvist

Gozlan

Britton

2017

Ecology of Freshwater Fish

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Variation in movement between individuals can have important ecological effects on populations and ecosystems, yet the factors driving differences in movement and their consequences remain poorly understood. Here, individual variability in the movements of juvenile (age 0 + and 1 + year) pike Esox lucius was assessed using passive integrated transponder (PIT) telemetry in off-channel nursery areas over a 26-month period. Differences in the movement patterns of individuals were tested against their body sizes, ages, growth rates and trophic positions using data collected through a combination of catch-and-release sampling and stable isotope analyses. Results revealed that variation in movement between individuals was affected by age, with 1 + individuals moving more than individuals of age 0 + , but not length. Individuals whose TP was low on their initial capture event moved significantly less than those with a higher initial TP. Individuals that moved more grew faster and achieved a higher final TP. These results suggest that higher activity (i.e., increased movement) increases resource acquisition that enhances growth rates, which could ultimately maximise individual performances. K E Y W O R D SInter-individual variation, movement, PIT telemetry, stable isotope analyses

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Section: Methodsmentioning

confidence: 99%

Relationships between individual movement, trophic position and growth of juvenile pike (Esox lucius)

Nyqvist

Gozlan

Britton

2017

Ecology of Freshwater Fish

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“…Twentyfive tracking surveys were completed between 23 July 2008 and 9 October 2008 (approximately two per week), all performed by the same operator; each survey lasted on average 3.5 h and commenced at dawn, mid-day or dusk. When a tagged eel was detected, cell identity and the distance to the closest bank (nearest 0.1 m) were recorded (details on tracking in Cucherousset et al 2010). To ensure that habitat niche assessment was not biased by tag loss, only data on those localisations that were followed by a recapture during any of the electric fishing surveys were used.…”

Section: Habitat Nichementioning

confidence: 99%

“…The study commenced on 17 July 2008 when the fish were initially captured by electric fishing (details in Cucherousset et al 2010). Captured individuals were anaesthetised with 2-phenoxyethanol, measured [total length (TL), nearest millimetre] and weighed [weight (W), nearest 0.1 g].…”

Section: Study Area and Population Monitoringmentioning

confidence: 99%

Fitness consequences of individual specialisation in resource use and trophic morphology in European eels

et al. 2011

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Individual specialisation can lead to the exploitation of different trophic and habitat resources and the production of morphological variability within a population. Although the ecological causes of this phenomenon are relatively well known, its consequences on individual fitness are less recognised. We have investigated the extent of individual specialisation in resource use and trophic morphology and its fitness consequences through a combination of tagging-recapture, stable isotope analyses and telemetry. The European eel (Anguilla anguilla) was the model species as it displays significant variability in head shape. Independent to their body length, individuals with broader heads displayed a significantly higher trophic position (δ(15)N) than individuals with narrower heads. This corresponded with a significantly higher proportion of prey fish in their diet compared with invertebrates and was associated with the use of a habitat niche located further from the river bank. The European eel therefore provides a rare empirical example of individual specialisation in resource use and trophic morphology in a natural population occurring at a very small spatial scale. Individuals with intermediate head morphology displayed lower body condition (a proxy of fitness) than individuals with extreme head morphology (i.e. narrower and broader headed individuals), demonstrating the existence of disruptive selection associated with individual specialisation.

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“…In our study, we assumed that no radio-tagged animals were missed during telemetry surveys, as there were no instances of these individuals being captured during electrofishing without first being detected by telemetry. If this were not the case, the model would have to include a parameter for the probability of detecting telemetry tags by telemetry (Cucherousset et al 2010;Melnychuk & Walters 2010;Welsh et al 2012). In larger systems where the telemetry search cannot be exhaustive, this would certainly be an important consideration.…”

Section: Discussionmentioning

confidence: 99%

Estimating population size in the presence of temporary migration using a joint analysis of telemetry and capture–recapture data

et al. 2014

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Summary1. Temporary migration -where individuals can leave and re-enter a sampled population -is a feature of many capture-mark-recapture (CMR) studies of mobile populations which, if unaccounted for, can lead to biased estimates of population capture probabilities and consequently biased estimates of population abundance. 2. We present a method for incorporating radiotelemetry data within a CMR study to eliminate bias due to temporary migration using a Bayesian state-space model. 3. Our results indicate that using a relatively small number of telemetry tags, it is possible to greatly reduce bias in estimates of capture probabilities using telemetry data to model transition probabilities in and out of the sampling area. In a capture-recapture data set for trout Cod in the Murray river, Australia, accounting for temporary migration led to overall higher estimates of capture probabilities than models assuming permanent or zero migration. Also, individual heterogeneity in detectability can be managed through explicit modelling. We show how accounting for temporary migration when estimating capture probabilities can be used to estimate the abundance and size distribution of a population as though it were closed. 4. Our model provides a basis for more complex models that might integrate telemetry data into other CMR scenarios, thus allowing for greater precision in estimates of vital rates that might otherwise be biased by temporary migration. Our results highlight the importance of accounting for migration in survey design and parameter estimation, and the potential scope for supplementing large-scale CMR data sets with a subset of auxiliary data that provide information on processes that are hidden to primary sampling processes.

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Determining the effects of species, environmental conditions and tracking method on the detection efficiency of portable PIT telemetry

Cited by 32 publications

References 25 publications

Relationships between individual movement, trophic position and growth of juvenile pike (Esox lucius)

Relationships between individual movement, trophic position and growth of juvenile pike (Esox lucius)

Fitness consequences of individual specialisation in resource use and trophic morphology in European eels

Estimating population size in the presence of temporary migration using a joint analysis of telemetry and capture–recapture data

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