Spatial abundance models and seasonal distribution for guanaco (Lama guanicoe) in central Tierra del Fuego, Argentina

Flores, Celina Eliana; Deferrari, Guillermo; Collado, Leonardo; Escobar, Julio; Schiavini, Adrián

doi:10.1371/journal.pone.0197814

Cited by 12 publications

(6 citation statements)

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“…The trophic overlap degree between the guanaco and domestic cattle (sheep, cow and horse), regarding consumed species and intake frequency, is similar to the results found in the studies previously carried out by Puig et al, 45 Fernández Pepi et al, 14 The guanaco's dietary flexibility and its condition as an intermediate consumer enables them to adapt efficiently to seasonal changes and to minimize the food competition with other herbivorous species, mainly during times of shortage. 15 Since guanacos migrate seasonally between forests and meadows, 46 as a combined effect of habitat requirements and overlap with domestic animals, the data obtained here complements previous studies in the area to gain knowledge in the ecology of the guanaco and the possible consequences of the dietary changes and use of habitat for the conservation and management of the species, as stated in theirs works Martínez Pasteur et al, 47 and Flores et al 48…”

Section: Eaba Easjsupporting

confidence: 61%

Guanacos’ and domestic livestock’s summer diets comparison in ecotone of “Tierra del Fuego” (Argentina)

Mg¹,

As²,

Mo³

et al. 2018

BIJ

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At present, it is believed that the population of guanacos has increased in the "Isla Grande de Tierra del Fuego", arising a conflict with livestock and forestry activities. The aim of this study was to evaluate the use of the guanaco's food resources, taking into account the presence of different types of domestic livestock, in order to provide a tool which will enable the evaluation of environmental management projects. We conducted the study in different areas, considering the presence/absence of domestic livestock and of guanaco. The diet was analyzed by identifying botanical remains present in the pretreated feces. The relative frequencies of ingested taxa were obtained and analyzed according to their functional groups, being the soft, herbaceous and graminoid grasses the most consumed, where the soft grasses were the most frequently ingested. Tree species only appear in diets of guanacos, in a low frequency, compared to other forms of life. In the case of soft grasses, forbs and Graminoides, the diets differ according to ingested species and intake frequency. These results allow us to establish that the guanaco selects the items to be consumed, changing its diet based on the presence of other herbivores, and has a trophic overlap with domestic livestock, mainly with sheep.

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Section: Eaba Easjsupporting

confidence: 61%

Guanacos’ and domestic livestock’s summer diets comparison in ecotone of “Tierra del Fuego” (Argentina)

Mg¹,

As²,

Mo³

et al. 2018

BIJ

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“…We estimated actual guanaco abundance with density surface modelling (Miller et al, 2013), used in previous studies of guanaco abundance (Flores et al, 2018, 2020). This approach links recorded individuals and covariates through a spatially explicit model to explain variability in abundance as well as to make predictions regarding abundance in unsampled areas (Miller et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…Transects were 1,400 m wide (700 m each side of the flight trajectory), as previously used by Flores et al (2018, 2020). The detection probability of guanacos on the transect was assumed to be constant and equal to 1.…”

Section: Methodsmentioning

confidence: 99%

Human–wildlife conflicts in Patagonia: ranchers’ perceptions of guanacoLama guanicoeabundance

Flores¹,

Lichtenstein

Schiavini

2023

Oryx

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Conflicts between people and wildlife have become widespread as people move to areas previously home to wildlife and as wild populations recover. In Patagonia, one of the main threats to guanaco Lama guanicoe conservation is the animosity of sheep ranchers towards the species. As key stakeholders in guanaco conservation we assessed ranchers’ perceptions regarding guanaco abundance in Isla Grande de Tierra del Fuego, Argentina. We contrasted these perceptions with estimated guanaco abundance and explored the socio-ecological factors influencing perceptions and how perceptions of overabundance are rooted in contextual factors rather than actual abundance. We performed semi-structured interviews with ranchers from Isla Grande and estimated guanaco abundance independently using density surface modelling. Ranchers were divided into three categories depending on their perception of guanaco abundance: ‘too many’, ‘many’ and ‘normal’. Those in the ‘many’ and ‘normal’ categories perceived guanaco abundance as being similar to actual abundance, whereas those in the category ‘too many' overestimated guanaco abundance. The perceived issues affecting livestock production varied between categories, although feral dogs emerged as the main problem. Negative perceptions of the guanaco stemmed from ranchers' beliefs that the species reduces forage availability for livestock, and from their disappointment about the government's handling of concerns regarding livestock production. Greater understanding and integration of the human dimension in conservation are needed to design more inclusive and resilient management plans.

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“…En el movimiento anual en cada subpoblación migratoria, las agrupaciones familiares se reúnen en grupos mixtos después de la temporada reproductiva para migrar juntos a la zona de invierno (Bolgeri 2016;Bonino 1991;Coronato 2014;Flores et al 2018). Como ya se mencionó, estas migraciones estacionales están relacionadas con la disponibilidad de alimentos y las condiciones climáticas (Puig et al 1997(Puig et al , 2001.…”

Section: Comportamiento Biología Y Genética De Poblaciones En Guanacosunclassified

Paleoconectividad Entre Poblaciones De Guanacos Del Noroeste De La Patagonia: Un Estudio De Adn Antiguo

Abbona,

Neme,

Puig

et al. 2023

Chungará (Arica)

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los últimos 2000 años AP, que es el resultado de la depresión de los recursos. En este artículo, examinamos la estructura genética de la población de guanacos durante los últimos 2000 años AP con más detalle. Se analizan 23 muestras de ADN antiguo de guanaco de toda la región. Los resultados muestran tres haplotipos comunes (1, 3 y 6) en Altoandino-Patagonia y en el Monte. En contraste, los haplotipos 2, 4 y 7 se verifican exclusivamente en las muestras de Altoandino-Patagonia que datan después de 1000 años AP. Este resultado puede representar la migración a través del flujo de genes de otra población después de 1000 años AP. Alternativamente, estos haplotipos distintivos pueden representar mutaciones que aparecieron debido a la fragmentación de la población luego del cuello de botella y a consecuencia de la interrupción del flujo de genes causado por el aumento de la presión de caza por parte de los humanos, lo que pudo desconectar las poblaciones regionales de guanaco.Palabras claves: guanaco, ADN antiguo, flujo génico, noroeste de la Patagonia, Holoceno Tardío.Hunting by humans impacted the guanaco population in northwestern Patagonia during the late Holocene. A recent ancient DNA study has demonstrated a decrease in guanaco population size during the last 2000 years BP, which appears to be the result of resource depression. In this paper, we examine the genetic structure of the guanaco population during the last 2000 years BP in more detail. We analyzed 23 samples of ancient guanaco DNA from across the region. The results show three common haplotypes (1, 3 and 6) in the Andean highlands and steppe lowlands. In contrast, haplotypes 2, 4 and 7 occur exclusively in the highland samples dating to 1000 years BP and after. Haplotypes 2, 4 and 7 may represent admixture through gene flow from another population after 1000 years BP. Alternatively, these distinctive haplotypes could represent mutations that appeared because of population fragmentation due to bottlenecks and gene flow interruption caused by increases in hunting pressure by humans, which may have disconnected the regional guanaco populations.

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Spatial abundance models and seasonal distribution for guanaco (Lama guanicoe) in central Tierra del Fuego, Argentina

Cited by 12 publications

References 61 publications

Guanacos’ and domestic livestock’s summer diets comparison in ecotone of “Tierra del Fuego” (Argentina)

Guanacos’ and domestic livestock’s summer diets comparison in ecotone of “Tierra del Fuego” (Argentina)

Human–wildlife conflicts in Patagonia: ranchers’ perceptions of guanacoLama guanicoeabundance

Paleoconectividad Entre Poblaciones De Guanacos Del Noroeste De La Patagonia: Un Estudio De Adn Antiguo

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