Ramiro Ovejero

Ramiro Ovejero
Instituto de Ecología Regional-(IER-CONICET-TUCUMAN-UNT)

Investigador (CONICET)

About

36
Publications
7,121
Reads
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332
Citations
Introduction
I am a Wildlife ecologist working at Institute of Regional Ecology (IER) at the National Council for Scientific and Technical Research (CONICET-TUCUMAN-UNT).
Additional affiliations
April 2013 - April 2015
National Scientific and Technical Research Council
Position
  • PostDoc Position
December 2007 - March 2012
National Scientific and Technical Research Council
Position
  • Becario Doctoral
January 2006 - January 2008
Direccion de Recursos Naturales Renovables (DRNR)
Position
  • Researcher
Education
November 2016 - December 2020
National Scientific and Technical Research Council
Field of study
  • Physiological ecology, population ecology, movement ecology, conservation; ecology of stress. wildlife management and conservation
March 2007 - March 2008
Faculty of Natural Science & Miguel Lillo Institute (FSCNAT-UEL- CONICET), National University of Tucumán
Field of study
  • Biology, Physiology, Endocrinology, wildlife management
March 1999 - December 2004
Faculty of Natural Science & Miguel Lillo Institute (FSCNAT-UEL-CONICET), National University of Tucumán
Field of study
  • Biology

Publications

Publications (36)
Chapter
The taxonomy and phylogeny of this species have been the subject of several published studies, including the use of genetic and genomic tools, which has allowed new advances in this topic. This chapter presents a summary of the names by which this species was called by the different cultures that lived in close relationship with the guanaco. Then,...
Chapter
Desertification is the most important social, economic, and ecological problem in Patagonia. Several factors have contributed to the ecosystem impoverishment: inadequate use of natural grasslands; lack of training and advisory services for producers; scarce transference of management technologies adapted for arid areas; low value of primary product...
Article
Full-text available
The factors that regulate the abundance and distribution of wild herbivores are key components of a species’ ecology and include bottom-up and top-down mechanisms, as well as aspects related to social organization. In territorial ungulates, males distribute themselves to enhance access to females by anticipating how resources will influence female...
Article
Human settlement into rural areas (counterurbanization) is generating new patterns of reforestation, with distinctive features compared to the previously considered pathways of forest transition through “economic development” and “forest scarcity”. Here, we discuss the specific features of this neglected pathway of forest recovery and describe the...
Article
Full-text available
Migration of ungulates (hooved mammals) is a fundamental ecological process that promotes abundant herds, whose effects cascade up and down terrestrial food webs. Migratory ungulates provide the prey base that maintains large carnivore and scavenger populations and underpins terrestrial biodiversity (fig. S1). When ungulates move in large aggregati...
Article
Aggression is a social behaviour which can be affected by numerous factors. The quality and quantity of food resources may play an important role in the aggressiveness of territorial ungulates as the defence of these resources influences female choice and mating opportunities. However, the relationship between food resources and aggression remains...
Article
Full-text available
Intraspecific variation in mating behavior has been documented in diverse taxa, including ungulates. Here, we report and describe for the first time the existence of alternative mating tactics in a wild guanaco (Lama guanicoe) partially migratory population. We document (1) a resource-defense tactic, widely reported for different populations; and (...
Chapter
Full-text available
Si bien hubo una drástica reducción poblacional del guanaco en Argentina, estimada entre el 90 y 97% desde la colonización europea, la tendencia de los últimos 30 años fue en aumento (González & Acebes 2016). Actualmente, la población total estimada para Argentina es de un poco menos de un millón de guanacos (González & Acebes 2016) y la amplitud e...
Conference Paper
Full-text available
El equilibrio entre la energía requerida para satisfacer las funciones vitales y la energía que se obtiene de la dieta representa un aspecto fundamental para comprender los atributos adaptativos de una especie a su ambiente. Nuestro objetivo fue evaluar la incidencia de la calidad de la dieta sobre los mediadores fisiológicos de la movilización ene...
Article
In adaptive terms, animals are subject to challenges imposed by their environment. To address physiological patterns in wild mammals, the non‐invasive study of glucocorticoid hormones has become the main approach through two well‐defined conceptual frameworks: one is related to stress responses, whereas another refers to the glucocorticoids as phys...
Chapter
South American alpine environments are home to 200 mammal species, among them 19% can be considered restricted or endemic to the region. Also, almost 20% of the species have conservation concerns, while 15% lack sufficient conservation data. Rodents, bats and carnivores represent most of the mammal species of the alpine region, whereas some of thes...
Article
Habitat partitioning is considered one of the main mechanisms of coexistence among small mammals. This is especially evident in arid environments where resources are particularly scarce. Habitat characteristics such as vegetation heterogeneity and complexity are expected to increase species coexistence, increasing the number of microhabitats that c...
Article
In certain areas of South America, free-ranging, wild guanacos (Lama guanicoe) are exploited for fibre by local people. This activity includes the capture and handling of animals which can adversely affect their behaviour and physiology. This study investigated the behavioural and physiological responses of guanacos to shearing and handling activit...
Article
Full-text available
Background Providing the context for the evolution of life-history traits, habitat features constrain successful ecological and physiological strategies. In vertebrates, a key response to life’s challenges is the activation of the Stress (HPA) and Gonadal (HPG) axes. Much of the interest in stress ecology is motivated by the desire to understand th...
Article
Full-text available
Background-Providing the context for the evolution of life-history traits, habitat features constrain successful ecological and physiological strategies. In vertebrates, a key response to life's challenges is the activation of the Stress (HPA) and Gonadal (HPG) axes. Much of the interest in stress ecology is motivated by the desire to understand th...
Preprint
Full-text available
Background -Providing the context for the evolution of life-history traits, habitat features constrain successful ecological and physiological strategies. In vertebrates, a key response to life's challenges is the activation of the Stress (HPA) and Gonadal (HPG) axes. Much of the interest in stress ecology is motivated by the desire to understand t...
Preprint
Full-text available
Background -Providing the context for the evolution of life-history traits, habitat features constrain successful ecological and physiological strategies. In vertebrates, a key response to life's challenges is the activation of the Stress (HPA) and Gonadal (HPG) axes. Much of the interest in stress ecology is motivated by the desire to understand t...
Article
There is growing concern about the effect of livestock on wild ungulate populations, particularly in arid ecosystems, where waterholes are an extremely scarce resource, around which animals tend to gather, primarily in the dry season. This situation is worrying in South American deserts, where guanaco is the native species that often shares trophic...
Article
We conducted focal observations of vicuña, a year-around territorial mammal, to compare vigilance behaviour between territorial and bachelor males outside the reproductive season. We hypothesized that the time spent vigilant would depend on male social status, considering the potential effects of several variables: sampling year, group size, distan...
Article
Full-text available
Euneomys is a genus of sigmodontine rodent endemic to South America, distributed along the Andes of Argentina and Chile and in adjoining Patagonian steppe. Here, we studied specimens of Euneomys from different localities in the Central Andes, Mendoza Province, Argentina. Karyotypic analyses confirm the presence of a new karyomorph of Euneomys chinc...
Article
tWe conducted focal observations of vicu˜na, a year-around territorial mammal, to compare vigilancebehaviour between territorial and bachelor males outside the reproductive season. We hypothesizedthat the time spent vigilant would depend on male social status, considering the potential effects ofseveral variables: sampling year, group size, distanc...
Article
Full-text available
Animals optimize the trade-off between the cost of not fleeing and the benefits of staying because the factors that influence flight decisions and the disturbance level of a particular stimulus can vary both spatially and temporally. Different factors (human impact and habitat characteristics) likely to modify anti-predator behaviour in different t...
Article
Animals optimize the trade-off between the cost of not fleeing and the benefits of staying because the factors that influence flight decisions and the disturbance level of a particular stimulus can vary both spatially and temporally. Different factors (human impact and habitat characteristics) likely to modify anti-predator behaviour in different t...
Article
Full-text available
Monitoring species abundance and distribution is a prerequisite when assessing species status and population viability, a difficult task to achieve for large herbivores at ecologically meaningful scales. Co-occurrence patterns can be used to infer mechanisms of community organization (such as biotic interactions), although it has been traditionally...
Article
Full-text available
Live-shearing of wild guanacos Lama guanicoe may affect their reproductive success and population resilience, and therefore it is important to assess the biological sustainability of obtaining their wool. We evaluated effects of capture and shearing on survival and reproduction, population parameters, daily movements, ranging behaviour and spatial...
Article
Full-text available
Habitat can constrain and shape successful ecological and physiological strategies, thus providing the context for the evolution of life-history traits. However, unpredictable challenges, such as storms, natural disasters, and human activities can also have great effects on stress. Glucocorticoids (GCs) are adrenal steroid hormones that play an imp...
Article
Species occurrence depends on both environmental and biotic factors (species interactions). Consideration of species interactions when estimating functions of population distribution is unusual, and may be crucial to understand and predict how species use space and resources. In this study, we combine resource selection probability functions (RSPFs...
Article
Both ethology and physiology can provide insights about stress conditions in wild animals during handling. Lama guanicoe (guanaco) is the major large herbivore inhabiting arid zones in Argentina. Since 2005, the Payún Matrú Cooperative, a business established and run by native people, has captured and handled guanacos for shearing at Payunia Reserv...
Article
Full-text available
Analyzing coexistence of exotic and native ungulates in arid areas is important from both a theoretical and a species conservation perspective. We assess the habitat use patterns and possible interference between guanaco (Lama guanicoe) and feral livestock (donkey and cattle) in arid environments of South America. To determine habitat use and niche...
Article
Full-text available
Context. The use of wild guanacos (Lama guanicoe) through live capture and shearing may contribute to their conservation by providing an economic alternative to rural inhabitants. However, none of the biological impacts of this activity, including the physiological ones, have been addressed. Aims. The aim of this work was to characterise the acute...
Article
Full-text available
The first density estimates of a peripheral guanaco population and its habitat use at different spatial scales are presented for a protected area of Monte desert, Argentina. Transects were surveyed in the wet and dry seasons of 2005. All guanaco herds observed during systematic surveys using roads and tracks were GPS located and their habitat use w...
Chapter
Full-text available
BIRDS OF THE GALLERY FORESTS OF NORTHEASTERN CORRIENTES, ARGENTINA: BIODIVERSITY, DISTRIBUTIONAL PATTERNS AND MIGRATION. We carried out a study of bird species richness, in the western side of the Uruguay River, Corrientes Province. We registered 185 species of birds, of 44 families. Psilorhamphus guttatus, Pyrrhocoma ruficeps, Amaurospiza moesta a...

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Projects

Projects (5)
Project
Conflicts between the human dimension and wildlife occur when the interests and objectives of human activities, such as extensive and intensive livestock farming, agriculture and extractive activities do not take into account the native flora or fauna of the landscape, much less its functional diversity in a perspective of conservation of ecosystem services. In this sense, guanaco’s populations on Andean Patagonian Steppe (of Argentina) were considered by rural settlers as a plague due to the competition for pastures and were historically exterminated. Today only 15% of the original number of guanacos remains, and populations are fragmented. The guanaco population in La Payunia is one of the few existing populations that continue to exhibit annual long-distance migrations. A community self-organized in a cooperative ("Payun Matru") of people living around La Payunia reserve has begun annual roundup and live shearing of guanacos to collect their valuable wool following strict animal welfare protocols. Our priority as researchers for the national organizations of scientific and technological promotion (CONICET), is co-work with international agencies (e.g WCS- USFWS-UICN) to build and strengthen wildlife-friendly actions to bring solutions on the conflict generated between conservation and livestock production paradigm. The purpose of this project is to highlight the importance of the sustainable use of guanaco fiber due to the potential of this activity to generate local socio-economic development and become an effective conservation tool reducing the impact of the human dimension. To achieve this, we propose to 1) Promote the sustainable use of wild guanaco populations through demonstrative experiences of live-shearing in La Payunia Reserve; 2) Encourage the generation of a chain that increases the commercial value of the guanaco fiber by linking primary production sectors with the national and international textile sector; 3) Generate wildlife-friendly certifications that increase the market value of the fiber; and 4) Encourage WF actions through effective communication strategies giving visibility to the sustainable management of wild guanacos. We consider that the use of wild camelids would have a fundamental role in reducing the process of desertification of arid ecosystems, providing an economic alternative (added to the high commercial value of the guanaco fiber in the external market) for local producers and increasing the profitability of the land due to its aptitude for complementary and alternative uses.
Project
The goal of this project is to study how environmental and intrinsic features influence aggressive behaviour in wild guanacos along de the breeding season.
Project
Estudiar la distribución y migración de aves mediante campañas de anillamiento que realiza el Centro Nacional de Anillado de Aves de Argentina.