Esperanza A. Varela

ORCID: 0000-0003-2782-538X
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Research Areas
  • Marine animal studies overview
  • Cephalopods and Marine Biology
  • Bat Biology and Ecology Studies
  • Ichthyology and Marine Biology
  • Isotope Analysis in Ecology
  • Aquaculture disease management and microbiota
  • Fungal Infections and Studies
  • Zoonotic diseases and public health
  • Species Distribution and Climate Change
  • Parasitic Diseases Research and Treatment
  • Toxoplasma gondii Research Studies
  • Parasite Biology and Host Interactions
  • Microbial infections and disease research
  • Hydrology and Sediment Transport Processes
  • Venomous Animal Envenomation and Studies
  • Polar Research and Ecology
  • Hydraulic flow and structures
  • Space Exploration and Technology
  • Human-Animal Interaction Studies
  • Soil erosion and sediment transport
  • Wildlife Ecology and Conservation
  • Hemiptera Insect Studies
  • Antibiotic Resistance in Bacteria
  • Marine and coastal plant biology
  • Avian ecology and behavior

Bernardino Rivadavia Natural Sciences Museum
2001-2024

Consejo Nacional de Investigaciones Científicas y Técnicas
2014-2024

Ministerio de Salud - Provincia de Buenos Aires
2004

The South American sea lion, Otaria flavescens (Shaw, 1800) population is steadily expanding along the Patagonian coast of Argentina in last decades. However, little known about feeding ecology species area. aim this study was to analyze food habits O. from 91 scats collected at Río Negro province, during winter and spring 2005. Fish occurred 96% containing prey remains, followed by cephalopods (26%). Raneya brasiliensis (Kaup, 1856) most frequent abundant occurring 58.6% samples...

10.1590/s0073-47212012000400005 article EN cc-by Iheringia Série Zoologia 2012-12-01

ABSTRACT. Oceanographic fluctuations and changes in ocean productivity directly affect the abundance distribution of prey species, which turn, population status their predators. In order to have a better understanding this predator-prey relationship, aim present study was analyze diet South American Sea Lion Otaria flavescens (Shaw, 1800) two rookeries San Matias Gulf, northern Patagonia (Argentina). A total 52 scat samples O. were collected Promontorio Belén colony 35 Caleta de los Loros...

10.1590/1678-4766e2022023 article EN cc-by Iheringia Série Zoologia 2022-01-01

Chiroptera of Buenos Aires City and Province, Argentina . The distribution thirteen species bats in Province is provided based on scientific collections bibliographical data. Three families are reported: Phyllostomidae, with one genus species; Vespertilionidae, four genera eight species, Molossidae, species. Information taxonomy, specimens examined additional records, external cranial morphological measurements, reproduction, habitat preferences, predation by owls, public health importance...

10.22179/revmacn.3.104 article EN cc-by Revista del Museo Argentino de Ciencias Naturales 2001-01-01

Abstract Cephalopods are important prey in the diet of top predators, such as marine mammals and seabirds. However, detailed information on their trophic relationships Patagonian ecosystem is scarce, including those cephalopod species with commercial interest. The aims this study were to evaluate composition component Otaria byronia determine habitat use levels main by measuring stable isotopic signature beaks. Between May 2005 February 2009, fresh faecal samples collected from two sea lions...

10.1017/s0025315419000432 article EN Journal of the Marine Biological Association of the United Kingdom 2019-06-18

The false killer whale, Pseudorca crassidens, exhibits one of the widest and most continuous distributions among cetaceans. However, basic information about its biology is poorly known due to low frequency sightings offshore habits. Moreover, knowledge on this species has been obtained from stranded animals. On 3 March 2012, in proximity a colony South American sea lions (Otaria flavescens) located at Caleta de los Loros, Río Negro Province, Argentina (40o59’S, 64o14’W), cetacean skull was...

10.5597/lajam00197 article EN Latin American Journal of Aquatic Mammals 2015-08-24

Fil: Daneri, Gustavo Adolfo. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina Coordinacion Administrativa Parque Centenario. Museo Argentino Ciencias Naturales Bernardino Rivadavia; Argentina

10.5597/lajam00180 article ES Latin American Journal of Aquatic Mammals 2014-01-27

Morphometrics of two specimens Ross Seal, Ommatophoca rossi, housed at the Mammals collection Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. The description material in collections contribute to knowledge and conservation species, specially those that are scarcely represented due relatively difficult access their distribution range. seal is an example this, even though this species not threatened its status, apparent changes ice pack extension may affect state populations....

10.22179/revmacn.14.213 article EN cc-by Revista del Museo Argentino de Ciencias Naturales 2012-01-01

Chiroptera of Buenos Aires City and Province, Argentina. Part II. Additional data eight species bats (Vespertilionidae Molossidae) Province are provided, based on scientific collections specimens collected from june 2002 through march 2003. Information distribution, reproduction, migrations, presence colonies positive rabies diagnosis provided in individual accounts. Eleven stomach contents five insectivorous ( Lasiurus ega , L. cinereus Eumops bonariensis Molossus molossus Tadarida...

10.22179/revmacn.6.80 article EN cc-by Revista del Museo Argentino de Ciencias Naturales 2004-01-01
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