Geographical origin of dabbling ducks wintering in Iberia: sex differences and implications for pair formation

Parejo, Manuel; Navedo, Juan G.; Gutiérrez, Jorge S.; Abad‐Gómez, José M.; Villegas, Auxiliadora; Corbacho, Casimiro; Sánchez‐Guzmán, Juan M.; Masero, José A.

doi:10.1111/ibi.12256

Cited by 7 publications

(7 citation statements)

References 40 publications

(76 reference statements)

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“…Northern pintails were tagged with GPSs using Teflon harnesses [37]. The six devices deployed in 2012 were GPS-GSM (Global System for Mobile Communications), model Duck-3 (35 g; Ecotone Telemetry, Gdynia, Poland) and the six deployed in 2014 were model GiPSy-4 (25 g; Technosmart, Roma, Italy).…”

Section: Methodsmentioning

confidence: 99%

“…[40,41]), and they allow us to understand how individuals perceive and react to environmental changes [42]. All birds tagged on 2012 with the model Duck-3 started the north migration successfully, but all they died by hunting activities out of Iberia before returning to Extremadura rice fields [37]. We also have no evidence that the birds equipped with the model GiPSy-4 returned to our study area.…”

Section: Methodsmentioning

confidence: 99%

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Day and night use of habitats by northern pintails during winter in a primary rice-growing region of Iberia

et al. 2019

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Loss of natural wetlands is a global phenomenon that has severe consequences for waterbird populations and their associated ecosystem services. Although agroecosystems can reduce the impact of natural habitat loss, drivers of use of such artificial habitats by waterbirds remain poorly understood. Using the cosmopolitan northern pintail Anas acuta as a model species, we monitored home-range and fine-scale resource selection across the agricultural landscape. Individuals were tracked using GPS-GSM transmitters, and a suite of environmental and landscape features were measured throughout the winter seasons. Spatial patterns of habitat use were analysed using generalized linear mixed effect models by integrating field-observations with GPS telemetry. All birds used rice fields as foraging grounds at night and commuted to an adjacent reservoir to roost during daylight. Home-ranges and maximum foraging distances of nocturnally foraging birds increased with decreasing availability of flooded fields, and were positively correlated with moonlight levels. Birds selected flooded rice paddies (water depth range: 9–21 cm) with standing stubble and substrate with pebbles smaller than 0.5 cm in diameter. Density of rice seeds, rice paddy size, and other environmental and landscape features did not emerge as significant predictors. Our findings indicate that nocturnal foraging of northern pintails within rice fields is driven primarily by straw manipulation, water level and substrate pebble size. Thus, the presence of standing stubble in flooded paddies with soft bottoms should be prioritized to improve foraging areas for dabbling ducks. These management procedures in themselves would not increase economic costs or affect rice production and could be applied for dabbling-duck conservation throughout the world.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Day and night use of habitats by northern pintails during winter in a primary rice-growing region of Iberia

et al. 2019

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“…This use of spatially explicit assignments to determine the origin of unmarked, migrant individuals using measurements of tissue stable-hydrogen isotopes (δ 2 H) has grown considerably over the past two decades (reviewed in [4]). In addition to numerous non-game animals, this isotopic approach has been applied to determine the geographic origins of several hunted waterfowl species across North America [5][6][7][8][9][10] and Eurasia [11][12][13][14]. In this context using the stable isotope approach, origin is generally not a specific location, but instead describes a probabilistically defined region that likely contains the location where an individual previously grew the sampled tissue(s) such as a natal, breeding, or non-breeding site.…”

Section: Introductionmentioning

confidence: 99%

Assigning harvested waterfowl to geographic origin using feather δ2H isoscapes: What is the best analytical approach?

et al. 2023

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Establishing links between breeding, stopover, and wintering sites for migratory species is important for their effective conservation and management. Isotopic assignment methods used to create these connections rely on the use of predictable, established relationships between the isotopic composition of environmental hydrogen and that of the non-exchangeable hydrogen in animal tissues, often in the form of a calibration equation relating feather (δ2Hf) values derived from known-origin individuals and amount-weighted long-term precipitation (δ2Hp) data. The efficacy of assigning waterfowl to moult origin using stable isotopes depends on the accuracy of these relationships and their statistical uncertainty. Most current calibrations for terrestrial species in North America are done using amount-weighted mean growing-season δ2Hp values, but the calibration relationship is less clear for aquatic and semi-aquatic species. Our objective was to critically evaluate current methods used to calibrate δ2Hp isoscapes to predicted δ2Hf values for waterfowl. Specifically, we evaluated the strength of the relationships between δ2Hp values from three commonly used isoscapes and known-origin δ2Hf values three published datasets and one collected as part of this study, also grouping these data into foraging guilds (dabbling vs diving ducks). We then evaluated the performance of assignments using these calibrations by applying a cross-validation procedure. It remains unclear if any of the tested δ2Hp isoscapes better predict surface water inputs into food webs for foraging waterfowl. We found only marginal differences in the performance of the tested known-origin datasets, where the combined foraging-guild-specific datasets showed lower assignment precision and model fit compared to data for individual species. We recommend the use of the more conservative combined foraging-guild-specific datasets to assign geographic origin for all dabbling duck species. Refining these relationships is important for improved waterfowl management and contributes to a better understanding of the limitations of assignment methods when using the isotope approach.

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“…Using harnesses which incorporate a weak-link, designed to enable the entire harness and device to be safely shed at some future point, provides a favourable alternative to permanent harnesses. Weak-links are not a novel idea and have been incorporated into harness design for decades (Karl & Clout 1987) and are widely used, mostly on raptors (Bedrosian et al 2015;McIntyre et al 2009), but also on other taxa (Bedrosian & Craighead 2007;Deguchi et al 2014;Higuchi et al 2004;Parejo et al 2015). However, there are uncertainties about the reliability of weak-link harnesses (Kenward 1985) and evaluation of their use remains scarce in the literature.…”

Section: Introductionmentioning

confidence: 99%

Development of a weak-link wing harness for use on large gulls (Laridae): methodology, evaluation and recommendations

Clewley,

Clark,

Thaxter

et al. 2021

Seabird

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Both for the welfare of the birds studied and the validity of the results obtained, it is important that biologging attachment methods should be suitably safe and effective. We describe a weak-link wing harness, designed for long-term attachment, which safely detaches from the bird without need for recapture, and a UK field trial on two species of gull with contrasting life-histories, Herring Gull Larus argentatus and Lesser Black-backed Gull L. fuscus. We fitted 15 GPS devices to Herring Gulls in 2014 using three different weak-link materials: cotton thread, cotton piping cord and nitrile rubber. Productivity and return rates were compared against those fitted with permanent harnesses and a control group. A further 36 weak-link harnesses were fitted to Lesser Black-backed Gulls in 2017 and 2018 using GPS-GSM devices that provided more accurate attachment durations. The weak-link design was suitable for Herring and Lesser Black-backed Gulls and harnesses detached completely. Devices fitted with cotton piping cord or nitrile weak-link harnesses remained attached to Herring Gulls for up to four years. Cotton thread was less durable, with harnesses detaching in 1–2 years. We did not detect any significant effects on breeding success or return rates from the harnesses, although small effects sizes cannot be discounted. Devices fitted to Lesser Black-backed Gulls with 6-ply cotton, 18-ply cotton or piping cord weak- link harnesses had respective mean (± standard error) minimum attachment durations of 102 ± 13.6 days (N = 15), 358 ± 42 days (N = 18) and 596 ± 225 days (N = 2). The use of weak-link harnesses can provide a flexible and favourable alternative to permanent designs mitigating some of the associated risks.

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Geographical origin of dabbling ducks wintering in Iberia: sex differences and implications for pair formation

Cited by 7 publications

References 40 publications

Day and night use of habitats by northern pintails during winter in a primary rice-growing region of Iberia

Day and night use of habitats by northern pintails during winter in a primary rice-growing region of Iberia

Assigning harvested waterfowl to geographic origin using feather δ2H isoscapes: What is the best analytical approach?

Development of a weak-link wing harness for use on large gulls (Laridae): methodology, evaluation and recommendations

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