Javier Negrete
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View article: New minimally invasive techniques for sample collection in Antarctic seals
New minimally invasive techniques for sample collection in Antarctic seals Open
Remote or minimally invasive sampling techniques are essential in wildlife research, particularly for Antarctic seals. These methods reduce handling time, minimize animal stress, and improve biosecurity by preventing pathogen transmission,…
View article: Assessing the influence of blubber stratification on the estimation of diet in phocid seals using the MixSIAR model
Assessing the influence of blubber stratification on the estimation of diet in phocid seals using the MixSIAR model Open
Blubber stratification can significantly impact diet estimation, as using the inner or outer blubber layer may lead to different results depending on the degree of stratification present. We aimed to quantitatively evaluate the effect of b…
View article: ‘I walk a lonely road’: solitary seals have fewer lice
‘I walk a lonely road’: solitary seals have fewer lice Open
Leopard seals ( Hydrurga leptonyx ) lead solitary lives, mainly associated with sea ice, and they are parasitized by the sucking louse Antarctophthirus ogmorhini , one of the few known marine insects and probably the only group adapted to …
View article: The deeper the rounder: body shape variation in lice parasitizing diving hosts
The deeper the rounder: body shape variation in lice parasitizing diving hosts Open
View article: Genetic Diversity and Population Dynamics of Lobodon Carcinophaga in Danco Coast, Antarctica
Genetic Diversity and Population Dynamics of Lobodon Carcinophaga in Danco Coast, Antarctica Open
View article: Conteo leucocitario del elefante marino del sur Mirounga leonina en Caleta Potter, Península Antártica, ¿influye la presencia de parásitos?
Conteo leucocitario del elefante marino del sur Mirounga leonina en Caleta Potter, Península Antártica, ¿influye la presencia de parásitos? Open
View article: Extreme dietary specialisation in adult male southern elephant seals: determining variation between individual trophic diets
Extreme dietary specialisation in adult male southern elephant seals: determining variation between individual trophic diets Open
Although dietary studies have provided important insights into the causes and ramifications of diet variation for the southern elephant seal (SES) (Mirounga leonina) , adult males are comparatively underrepresented within that literature. …
View article: Correction to: The relevance of fish in the summer diet of the Antarctic fur seal (Arctocephalus gazella) at Hope Bay, Antarctic Peninsula and Stranger Point, South Shetland Islands
Correction to: The relevance of fish in the summer diet of the Antarctic fur seal (Arctocephalus gazella) at Hope Bay, Antarctic Peninsula and Stranger Point, South Shetland Islands Open
View article: Sex‐specific mercury levels in skin samples of southern elephant seals (<i>Mirounga leonina</i>) at Isla 25 de Mayo (King George Island), Antarctic Peninsula
Sex‐specific mercury levels in skin samples of southern elephant seals (<i>Mirounga leonina</i>) at Isla 25 de Mayo (King George Island), Antarctic Peninsula Open
The southern elephant seal (SES; Mirounga leonina ) has a circumpolar distribution, breeding mainly on sub‐Antarctic islands and making long trips between breeding or molting and foraging areas. Most individuals from colonies in the South …
View article: Tell me who you go with and I will tell you what you do: Antarctic seal lice behave differently
Tell me who you go with and I will tell you what you do: Antarctic seal lice behave differently Open
Lice of the family Echinophthiriidae are obligate and permanent ectoparasites of pinnipeds and sea otters. Morphological, ecological, and behavioral adaptations have enabled them to survive in their amphibian hosts. However, it has been sh…
View article: MARINE DEBRIS REACH ANTARCTIC SEALS: FIBERS ARE THE MAIN INGESTED MICROPLASTIC
MARINE DEBRIS REACH ANTARCTIC SEALS: FIBERS ARE THE MAIN INGESTED MICROPLASTIC Open
Contamination in the Antarctic ecosystem and biota has been reported since the 1990s, and concentrations of anthropogenic debris, including macro and microplastics, are increasing in this region. The interaction between fauna and microplas…
View article: The relevance of fish in the summer diet of the Antarctic fur seal (Arctocephalus gazella) at Hope Bay, Antarctic Peninsula and Stranger Point, South Shetland Islands
The relevance of fish in the summer diet of the Antarctic fur seal (Arctocephalus gazella) at Hope Bay, Antarctic Peninsula and Stranger Point, South Shetland Islands Open
The fish incidence, particularly notothenioids and myctophids, in the diet of non-breeding male Arctocephalus gazella in the western Antarctic Peninsula (AP) region is scarcely known. We made a comparative diet analysis on 158 faecal sampl…
View article: Morphological and molecular updates of Corynosoma bullosum (Linstow, 1892) Raulliet &amp; Henry, 1907 parasitizing southern elephant seals from the Antarctic Peninsula
Morphological and molecular updates of Corynosoma bullosum (Linstow, 1892) Raulliet & Henry, 1907 parasitizing southern elephant seals from the Antarctic Peninsula Open
Background: Previous descriptions of Corynosoma bullosum (Linstow, 1892) Railliet & Henry, 1907 show that the specimens vary greatly for the proportions of the different structures of the body, measurements of females and males, number of …
View article: Exploring fungal diversity in Antarctic wildlife: isolation and molecular identification of culturable fungi from penguins and pinnipeds
Exploring fungal diversity in Antarctic wildlife: isolation and molecular identification of culturable fungi from penguins and pinnipeds Open
To survey the diversity of fungal species that may be cultured from Antarctic penguins and pinnipeds, and to test the in vitro susceptibility to triazole drugs of any medically important Aspergillus spp. isolates. During an e…
View article: Categorización de los mamíferos de Argentina 2019: resumen y análisis de las amenazas
Categorización de los mamíferos de Argentina 2019: resumen y análisis de las amenazas Open
View article: Effect of host age, sex and life stage on the prevalence and abundance of sucking lice on Weddell seal in the Antarctic Peninsula
Effect of host age, sex and life stage on the prevalence and abundance of sucking lice on Weddell seal in the Antarctic Peninsula Open
Through evolutionary time, seal lice have developed morphological, behavioral, and ecological adaptations to cope with the amphibious lifestyle of their hosts in a co-evolutionary process. Consequently, the dynamics of lice populations are…
View article: Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals
Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals Open
View article: Insights into the genetic diversity of the leopard seal (Hydrurga leptonyx), inferredfrom mitochondrial DNA analysis, at Danco Coast, Antarctic Peninsula
Insights into the genetic diversity of the leopard seal (Hydrurga leptonyx), inferredfrom mitochondrial DNA analysis, at Danco Coast, Antarctic Peninsula Open
The leopard seal (Hydrurga leptonyx) is a genetically low-studied species. In order to conduct the first genetic diversity assessment of this species in Danco Coast (Antarctic Peninsula), 423 bp of the mitochondrial DNA Control Region (mtD…
View article: Riqueza de mamíferos no voladores de la provincia de La Pampa (Argentina) a través de diversas técnicas de muestreo
Riqueza de mamíferos no voladores de la provincia de La Pampa (Argentina) a través de diversas técnicas de muestreo Open
View article: Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component
Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component Open
We studied the diet of non-breeding male Antarctic fur Seals Arctocephalus gazella (Peters, 1875) at two different localities of the South Shetland Islands: Stranger Point, King George Island/Isla 25 de Mayo and Duthoit Point, Nelson Islan…
View article: Term placenta of the southern elephant seal (Mirounga leonina)
Term placenta of the southern elephant seal (Mirounga leonina) Open
View article: Nuevos registros para Lestodelphys halli (Thomas) en la provincia de La Pampa (República Argentina)
Nuevos registros para Lestodelphys halli (Thomas) en la provincia de La Pampa (República Argentina) Open
View article: Estudio de seguridad y eficacia de la arteriografía cerebral transradial
Estudio de seguridad y eficacia de la arteriografía cerebral transradial Open
Objetivo: Analizar la seguridad y eficacia de las arteriografías transradiales cerebrales realizadas en nuestro centro y describir la técnica, ventajas y complicaciones del acceso arterial radial.MaterIal y métodos: Revisión retrospectiva …
View article: Update of the population size and breeding performance of gentoo penguins (Pygoscelis papua) at Stranger Point/Cabo Funes, South Shetland Islands
Update of the population size and breeding performance of gentoo penguins (Pygoscelis papua) at Stranger Point/Cabo Funes, South Shetland Islands Open
View article: Adaptations to a semiaquatic lifestyle in the external ear of southern pinnipeds (Otariidae and Phocidae, Carnivora): Morphological evidences
Adaptations to a semiaquatic lifestyle in the external ear of southern pinnipeds (Otariidae and Phocidae, Carnivora): Morphological evidences Open
View article: Morfometría craneana comparada del lobo fino antártico (Arctocephalus gazella) de Islas Orcadas del Sur e Islas Shetland del Sur
Morfometría craneana comparada del lobo fino antártico (Arctocephalus gazella) de Islas Orcadas del Sur e Islas Shetland del Sur Open
Se estudió la morfometría craneana de dos agrupamientos poblacionales de lobo fino antártico, Arctocephalus gazella, pertenecientes a diferentes localidades del Arco de Scotia, con el objetivo de detectar variación geográfica. Esto podría …
View article: Fish prey of Weddell seals, Leptonychotes weddellii, at Hope Bay, Antarctic Peninsula, during the late summer
Fish prey of Weddell seals, Leptonychotes weddellii, at Hope Bay, Antarctic Peninsula, during the late summer Open
View article: The tympanic region of <i>Otaria byronia</i> (Otariidae, Carnivora) – morphology, ontogeny, age classes and dimorphism
The tympanic region of <i>Otaria byronia</i> (Otariidae, Carnivora) – morphology, ontogeny, age classes and dimorphism Open
Here we describe and explore for the first time the ontogeny and sexual dimorphism of the auditory region of Otaria byronia . We studied the tympanic region of skulls of 237 specimens of different ages and sexes. Geometric morphometric met…
View article: Lousy big guys: Lepidophthirus macrorhini infesting seals from Antarctica
Lousy big guys: Lepidophthirus macrorhini infesting seals from Antarctica Open
View article: Integument in Antarctic seals: A comparative study and its relation to extreme environments
Integument in Antarctic seals: A comparative study and its relation to extreme environments Open
Due to the semi‐aquatic lifestyle of seals and the extreme climates they inhabit, their integumentary system has aroused the curiosity of several authors for more than a century. The aim of this contribution was to perform an exhaustive hi…