Nesting habitat of Chubut Steamer Ducks in Patagonia, Argentina

Agüero, María Laura; Borboroglu, Jorge Pablo Garcia; Esler, Dan

doi:10.1071/mu09096

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…Chubut Steamerduck densities were higher on islands than mainland shorelines. Steamerducks prefer to nest on islands and islets, mostly along shorelines within bays and inlets with shallow waters protected from waves and predominant winds, and high vegetation cover (Agüero et al 2010); these characteristics are common features of the San Jorge Gulf, which may explain why Chubut Steamerducks are abundant in this area. Moreover, islands tend to be predator-free, allowing potential higher breeding success for flightless birds (Lack 1968).…”

Section: Discussionmentioning

confidence: 99%

“…Avian predators are prevalent in island localities. In our study area, two species of birds were observed to predate eggs of Chubut Steamerducks: Kelp Gulls Larus dominicanus and Crested Caracara Polyborus plancus (Agüero et al 2010). Great Skuas Catharacta skua , Giant Petrels Macronectes giganteus and Kelp Gulls prey upon ducklings of Tachyeres spp.…”

Section: Discussionmentioning

confidence: 99%

“…Chubut Steamerducks are flightless and have a low number of mature individuals restricted in their distribution and occurring close to the coast. In addition, because they require specific habitat features for breeding and foraging (Gatto et al 2008, Agüero et al 2010) they are particularly vulnerable to a wide array of threats. In conclusion, our study, in combination with the current and increased threats mentioned, indicates that the Chubut Steamerduck is of significant conservation concern and suggests that its IUCN listing should be upgraded and listed at least as ’Vulnerable’.…”

Section: Discussionmentioning

confidence: 99%

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Distribution and abundance of Chubut Steamerducks: an endemic species to Central Patagonia, Argentina

Agüero

Borboroglu

Esler

2011

Bird Conservation International

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SummaryWe documented the breeding distribution and estimated abundance of Chubut Steamerducks Tachyres leucocephalus, a flightless waterbird endemic to a relatively small section of coastline in Patagonia, Argentina. The distribution of Chubut Steamerducks is restricted to approximately 700 km of coast. We counted 1,703 adult steamerducks at a subset of shorelines within their range and estimated 1,841 adults after correcting for visibility for shore-based surveys. To estimate adult densities in unsurveyed areas, we used two different methods of extrapolation, resulting in estimates of 1,587 and 1,832 adults. Combined with numbers from surveyed shorelines, the total breeding population size is estimated to be between 3,428 and 3,673 adults. In addition, we counted 1,899 juvenile steamerducks, which occur in irregular aggregations. The Interjurisdictional Marine Park in San Jorge Gulf contains about 46% of the entire population, which may provide some protection from disturbance and habitat destruction. However, oil pollution, other anthropogenic activities, and invasive species still pose potential threats to the population. ResumenHemos documentado el rango de distribución y estimado el tamaño poblacional del pato vapor cabeza blanca Tachyres leucocephalus, un ave acuática no voladora endémica de una estrecha sección costera de Patagonia, Argentina. La distribución del pato vapor cabeza blanca esta restringida a aproximadamente 700 km de costa. Hemos contado 1,703 individuos a lo largo de sectores costeros discretos dentro de su rango de distribución, y estimado un total de 1,841 adultos luego de aplicar los correspondientes factores de corrección. Para estimar la densidad de adultos en los sectores no relevados, hemos utilizado dos métodos diferentes de extrapolación, resultando en un número estimado de 1,587 y 1,832 adultos. De esta forma, al sumar individuos relevados y estimados, el tamaño poblacional oscilaría entre los 3,428 y 3,673 adultos reproductores. Asimismo, hemos contado un total de 1,899 juveniles de pato vapor cabeza blanca, los cuales ocurren en agregaciones regulares. El Parque Interjurisdiccional Marino Golfo San Jorge alberga alrededor del 46% de la población, lo cual podría representar una medida de protección frente a disturbios o destrucción del hábitat. Sin embargo, la contaminación por hidrocarburos y otras actividades de orígen antrópico junto con la introducción de especies, representan un potencial peligro para la población completa.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Distribution and abundance of Chubut Steamerducks: an endemic species to Central Patagonia, Argentina

Agüero

Borboroglu

Esler

2011

Bird Conservation International

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“…Each island was surveyed by walking transects that cover whole area following methods describing in Agüero (2010). Eggs are only incubated by females, while males will be found invariably between the nest and the sea or swimming in shallow water in front of the nest (Agüero and García Borboroglu 2013).…”

Section: Field Nest Monitoringmentioning

confidence: 99%

“…According to Agüero et al (2010)Chubut Steamerducks were found nesting on islands and islets in sympatry and syntopy with other species that were observed stealing eggs of this duck species: Kelp Gulls (Larus dominicanus) and Southern Caracara (Caracara plancus) (Yorio 2001;Formoso et al 2019). In that sense, adding to the fact that Chubut Steamerducks select nest-sites with high vegetation cover in order to better protection from avian predators(Agüero et al 2010), it is probably that nocturnal recesses during incubation period contribute to minimize avian predation.…”

mentioning

confidence: 99%

Incubation pattern of endangered Chubut Steamerduck (Tachyeres leucocephalus) and environmental features: implications for conservation

Agüero¹,

Lorenti

Minardi

et al. 2022

Preprint

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Information of incubation behavior and factors that shape it is important for species which incubation is monoparental and of conservation concern. We assessed incubation pattern of a noteworthy endangered southern South America marine duck species (Tachyeres leucocephalus) in Northern San Jorge Gulf as their core breeding area during 2015, 2016 and 2018. We described the laying and incubation period, characterized nest incubation strategy, and determined the influence of environmental features on its incubation strategy considering that weather conditions have an effect on incubation pattern. Our data showed an upward trend of length of recesses with a downward trend on nest attendance as ambient temperature increases. In this sense, no wonder that during the cooler breeding season of 2015, females of Chubut Steamerducks have spent more time on the nest; in contrast to the warmer spring of 2016 where females have had more and longest recesses, spending less time on the nest. This study is the only one available describing Chubut Steamerduck’s incubation rhythm, and presenting quantified measures of incubation pattern. Our research provides valuable baseline information and contributes to increase knowledge on previously unknown life history features of this flightless, endemic, and vulnerable waterfowl species on the core of its narrow distribution range. It would be important and essential that this information be included on the Interjurisdictional Marine Park management plan, assuring an effective implementation.

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First description of the incubation pattern of an endemic and endangered marine duck species, the Chubut steamerduck (Tachyeres leucocephalus), and related environmental characteristics

Agüero

Lorenti²,

Minardi³

et al. 2023

Polar Biol

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Nesting habitat of Chubut Steamer Ducks in Patagonia, Argentina

Cited by 8 publications

References 14 publications

Distribution and abundance of Chubut Steamerducks: an endemic species to Central Patagonia, Argentina

Distribution and abundance of Chubut Steamerducks: an endemic species to Central Patagonia, Argentina

Incubation pattern of endangered Chubut Steamerduck (Tachyeres leucocephalus) and environmental features: implications for conservation

First description of the incubation pattern of an endemic and endangered marine duck species, the Chubut steamerduck (Tachyeres leucocephalus), and related environmental characteristics

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