A New Low‐Cost Instream Antenna System for Tracking Passive Integrated Transponder (PIT)‐Tagged Fish in Small Streams

Bond, Morgan H.; Hanson, Chad; Baertsch, Robert; Hayes, Sean A.; MacFarlane, R. Bruce

doi:10.1577/t06-084.1

Cited by 41 publications

(46 citation statements)

References 16 publications

(2 reference statements)

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“…Beginning in 2006, we scanned ANI annually to recapture deposited PIT tags. We conducted scans by traversing the entire island with a mobile PIT antenna (for equipment specifications, see Bond et al 2007) and GPS to mark location and identification of deposited tags (for more details, see . Because annual scans at ANI did not begin until 2006, we excluded from our analysis all steelhead PIT-tagged prior to 2005.…”

Section: Data Collection and Modelingmentioning

confidence: 99%

High predation on small populations: avian predation on imperiled salmonids

et al. 2013

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Abstract. Generalist predators can contribute to extinction risk of imperiled prey populations even through incidental predation. Quantifying predation on small populations is important to manage their recovery, however predation is often challenging to observe directly. Recovery of prey tags at predator colonies can indirectly provide minimum estimates of predation, however overall predation rates often remain unquantifiable because an unknown proportion of tags are deposited off-colony. Here, we estimated overall predation rates on threatened wild juvenile steelhead (Oncorhynchus mykiss) by generalist adult Western Gulls (Larus occidentalis) in six central California (USA) watersheds. We estimated predation rates by gulls from the recapture of PIT (passive integrated transponder) tags that were originally inserted into steelhead and were subsequently deposited at a Western Gull breeding colony, Año Nuevo Island (ANI). We combined three independent datasets to isolate different processes: (1) the probability a tagged steelhead was consumed during predation, (2) the probability a consumed tag was transported to ANI, and (3) the probability a transported tag was detected at ANI. Together, these datasets parameterized a hierarchical Bayesian model to quantify overall predation rates while accounting for tag loss between when prey were tagged and subsequent tag detection at ANI. Results from the model suggest that low recovery rates of PIT tags from steelhead at ANI were mostly driven by low probabilities of transportation ( 0.167) of consumed tags to ANI. Low transportation probabilities equate to high per-capita probabilities of predation (!0.306/yr) at the three watersheds in closest proximity to ANI, whereas predation rates were uncertain at watersheds farther from ANI due to very low transportation rates. This study provides the first overall estimate of Western Gull predation rates on threatened wild juvenile steelhead and suggests gull predation on salmonids is a larger source of mortality than was previously estimated from minimum predation rates. This study thus represents an important example of high rates of incidental predation by a generalist consumer on an imperiled prey and provides a quantitative framework to inform robust estimates of predation rates on small populations that can be applied to other systems where direct observation of predation is not feasible.

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Section: Data Collection and Modelingmentioning

confidence: 99%

High predation on small populations: avian predation on imperiled salmonids

et al. 2013

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“…The system was capable of detecting 134.2-kHz full duplex PIT tags (Bond et al 2007). The portable, polemounted, circular antenna was powered by a 6-V battery and carried in a backpack along with a data logger.…”

Section: Methodsmentioning

confidence: 99%

Assessing Avian Predation on Juvenile Salmonids using Passive Integrated Transponder Tag Recoveries and Mark–Recapture Methods

Frechette

Osterback²,

Hayes

et al. 2012

N American J Fish Manag

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Many populations of coho salmon Oncorhynchus kisutch and steelhead O. mykiss are listed under the U.S. Endangered Species Act. Until recently, the role of avian predation in limiting recovery of coho salmon and steelhead in central California coastal watersheds has been overlooked. We used recoveries of passive integrated transponder (PIT) tags from Año Nuevo Island (ANI), a breeding site for several species of piscivorous seabirds, to estimate predation rates on juvenile salmonids and identify susceptible life stages and species responsible for predation. A total of 34,485 PIT tags were deployed in coho salmon and steelhead in six watersheds in San Mateo and Santa Cruz counties. Tags were deposited on ANI by predators after ingestion of tagged fish. Because tags were not removed from the island and were detected on multiple sampling occasions, we were able to use mark–recapture models to generate a corrected minimum predation estimate. We used POPAN, a variation of the Jolly–Seber model, to generate an estimate of gross population abundance, which accounted for tags deposited on the island but not detected during surveys. Detections of 196 tags from surveys conducted between autumn 2006 and spring 2009 were incorporated into the model, producing a gross population estimate of 242 tags (SE = 9.8). Addition of tags detected between autumn 2009 and 2010 to the abundance estimate from POPAN produced a new minimum estimate of 362 tags on ANI. Western gulls Larus occidentalis probably were the primary predator depositing tags on ANI. Minimum predation estimates ranged from 0.1% (Soquel Creek) to 4.6% (Waddell Creek) of outmigrating coho salmon and steelhead smolts. Predation was potentially greater given still unquantified deposition of tags off‐colony and destruction of tags during digestive processes of predators. Finally, avian predators targeted estuary‐reared fish, which contributed disproportionately to adult populations, further impacting imperiled salmon populations. Received August 4, 2011; accepted August 27, 2012

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“…Elsewhere, portable PIT scanners were used to monitor behavior, movement, and habitat use of fishes in shallow waters of small streams [26,27], and fish movement has also been monitored in larger streams using units permanently or semi-permanently mounted to the substrate or man-made structure [28,29]. Initial testing of this technology in Lake Mohave relied on Biomark ® flat-plate antennas and FS2001 radiofrequency identification (RFID) scanners.…”

Section: Research Adaptation and Emerging Technologymentioning

confidence: 99%

“…In 2010, a PIT scanner design was proposed for use in the riverine sections of Lake Mohave based on systems described in Bond et al [28]. The design was adapted to allow the unit to be completely self-contained without a floating or a shore-based component.…”

Section: Research Adaptation and Emerging Technologymentioning

confidence: 99%

Adaptive Management of an Imperiled Catostomid in Lake Mohave, Lower Colorado River, USA

Kesner¹,

Wisenall²,

Marsh³

2016

Lake Sciences and Climate Change

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Lake Mohave, a man-made reservoir in the lower Colorado River, USA, was once home to the largest wild population of the endemic and endangered razorback sucker Xyrauchen texanus, estimated at 60,000 individuals in the late 1980s. Individuals of this population were 25 years or older because recruitment was precluded by the removal of larval production by introduced centrarchid species. A repatriation program was initiated in the 1990s to replace the aging population with young fish by capturing larvae from the reservoir and raising them in hatcheries and protected lakeside backwaters until they were released back into the reservoir. Although more than 200,000 fish have been repatriated to Lake Mohave, the repatriate population has remained at a few thousand fish. The wild population is now functionally extinct. The program has adapted to new threats to the population, political realities, and technological advances. Management shifted in 2006 to the Lower Colorado River Multi-Species Conservation Program, which has politicized the process. The aim of this chapter is to describe the initial, informal adaptive management strategy for razorback sucker in Lake Mohave, the transition to a formal program, and the inherent pitfalls that formalization entails.

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A New Low‐Cost Instream Antenna System for Tracking Passive Integrated Transponder (PIT)‐Tagged Fish in Small Streams

Cited by 41 publications

References 16 publications

High predation on small populations: avian predation on imperiled salmonids

High predation on small populations: avian predation on imperiled salmonids

Assessing Avian Predation on Juvenile Salmonids using Passive Integrated Transponder Tag Recoveries and Mark–Recapture Methods

Adaptive Management of an Imperiled Catostomid in Lake Mohave, Lower Colorado River, USA

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