Naturalis

Repositorio institucional de la
Facultad de Ciencias Naturales y Museo de la Universidad Nacional de La Plata

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Autores e Instituciones
La sección de Perfiles de autores e Instituciones reúne a las personas y organizaciones que forman parte de la producción científica disponible en el repositorio. Permite identificar a los investigadores, docentes y equipos de trabajo, así como sus filiaciones institucionales.
Producción Científica
La Producción científica reúne los resultados de investigación generados por los docentes e investigadores de la Facultad de Ciencias Naturales y Museo (UNLP) y Unidades del CONICET. Este espacio incluye artículos en revistas, trabajos en congresos, informes técnicos, tesis y otras contribuciones que reflejan el desarrollo del conocimiento en las distintas disciplinas de las ciencias naturales.
Publicaciones del Museo de La Plata
Las publicaciones del Museo son editadas por el Museo de La Plata desde 1890 hasta la actualidad, con artículos de Antropología, Botánica, Ecología, Geología, Paleontología y Zoología. Comenzaron a publicarse en 1890, de forma casi paralela con Los Anales del Museo. Francisco Pascasio Moreno consideraba que el Museo debía tener sus propias publicaciones constituyéndose como un medio para la difusión de las investigaciones que se realizaban en la institución y sirviendo además como elemento de canje con otros museos, bibliotecas e instituciones del mundo.

Recent Submissions

Flea infestations in companion animals: Challenges in heterogeneous subtropical environments
(Wiley, 2025-10-16) Urdarpilleta, Mara; Lamattina, Daniela; Salomón, Oscar Daniel; Lareschi, Marcela
Fleas are important for their role as parasites causing pulicosis or tungiasis, and as vectors of pathogens that can cause diseases in humans and other animals, in tropical and subtropical regions, with a disproportionate effect linked to contexts of structural poverty and social exclusion. This study evaluated the risk factors for flea parasitism in dogs and cats from urban (Ur) and rural (Ru) households in Puerto Iguazú, Argentina, through seasonal sampling between March 2017 and February 2018. Prevalence (P), mean intensity, and mean abundance of the host-associated variable were calculated. To identify associations between the presence/pseudoabsence of fleas and the explanatory variables, a generalized linear mixed model was constructed. A total of 1932 fleas, identified as Ctenocephalides felis felis (Bouché) (Siphonaptera: Pulicidae), were collected from 402 dogs (PUr = 79.8%; PRu = 88.4%) and 87 cats (PUr = 77.6%; PRu = 66.7%). The prevalence was higher in rural dogs. Regarding host species, the prevalence in dogs was higher than in cats in rural areas. Tunga penetrans L. (Siphonaptera: Tungidae) was observed in 195 dogs (PUr = 31.97%; PRu = 70.48%) and 29 cats (PUr = 4.46%; PRu = 59.46%), which was also more common in rural areas. Risk factors for C. f. felis presence in dogs included young age, lack of antiparasitic treatment, peridomestic fumigation, bare soil and lower humidity and temperature four weeks prior to sampling (w-4). In cats, infestation was associated with young age, the presence of infested dogs in the same household, and higher vegetation coverage. In both hosts, T. penetrans infestation was positively associated with no antiparasitic treatment, lower humidity in w-3, and higher humidity in w-1 and higher temperature in w-2. The findings indicate that the factors influencing the presence, prevalence and abundance of C. f. felis and T. penetrans may differ according to host, socio-environmental, climatic and soil conditions in each locality. The establishment of institutional policies is imperative to effectively manage flea parasitosis, particularly in regions of socio environmental heterogeneity.
Ácaros mesostigmátidos parásitos de aves silvestres y de corral en Sudamérica: estado actual del conocimiento y perspectivas a futuro
(Asociacion Espanola de Ecologia Terrestre (AEET), 2025-07-23) Arce, Sofía; Saravia-Pietropaolo, María José; Corbalán, Valeria Elizabeth; Lareschi, Marcela
El orden Mesostigmata (Acari: Parasitiformes) incluye muchas de las especies de ácaros asociadas a las aves y a sus nidos. En aves silvestres, estos ácaros se relacionan con reducciones en el fitness de sus hospedadores, mientras que en aves de corral pueden generar pérdidas económicas significativas. A pesar de su impacto, el conocimiento sobre la diversidad y epidemiología de los ácaros mesostigmátidos parásitos de aves en Sudamérica es limitado y proviene de estudios puntuales. En el presente trabajo se exponen los conocimientos actuales sobre este grupo de ácaros en Sudamérica, proporcionando una lista actualizada de las especies reportadas. Asimismo, se presentan perspectivas futuras de investigación sobre ácaros mesostigmátidos parásitos de aves. En aves silvestres de Sudamérica, el ácaro tropical de las aves, Ornithonyssus bursa, es una de las especies más frecuentemente reportadas, junto con otras de las familias Macronyssidae, además de representantes de las familias Dermanyssidae, Rhinonyssidae y Laelapidae. Ornithonyssus bursa también ha sido reportado en el pasado en sistemas comerciales de aves de corral de Sudamérica, pero aparentemente ha ocurrido un proceso de reemplazo en estos sistemas por el ácaro rojo de las gallinas, Dermanyssus gallinae (Dermanyssidae), y el ácaro de las aves del norte, Ornithonyssus sylviarum (Macronyssidae), dos especies de ácaros de amplia distribución geográfica frecuentemente asociadas a estos sistemas. Estas últimas también se han reportado en aves silvestres sudamericanas, posiblemente debido a eventos de ‘spillback’ desde animales domésticos a silvestres. Dado su potencial para transmitir patógenos, conocer la diversidad de estos ácaros en los distintos ambientes y hospedadores, e indagar sobre posibles eventos de ‘spillover’ y ‘spillback’, es también relevante para la epidemiología de enfermedades transmitidas por vectores en Sudamérica.
First record of Laelaps mazzai (Mesostigmata: Laelapidae) in Peru associated with Calomys sorellus (Cricetidae: Sigmodontinae), an endemic rodent, with insights about its morphological variation
(Sociedad Entomológica Argentina, 2025-06-30) Espinoza Carniglia, Mario Virgilio; Yauris, Carla; Rengifo, Edgardo M.; Lareschi, Marcela
Laelaps mazzai Fonseca (Mesostigmata: Laelapidae) is a parasitic mite associated with the genus Calomys Waterhouse (Rodentia: Cricetidae) that shows variations on the size of its dorsal shield. Although, there are six species of Calomys in Peru, there are no records of L. mazzai associated to those species and consequently, neither are records about its size variation. We report the first occurrence of L. mazzai in Peru, associated with Calomys sorellus Thomas and its variation in the dorsal shield size. Morphological and molecular analyses were used to identify the mites and explore potential phenotypic variations in this new host-parasite association. While the mites exhibited diagnostic characters consistent with L. mazzai, they displayed larger dorsal shields, longer distance between setae, and fewer setae in the medial podonotal region compared to mites from other Calomys species. However, molecular analysis of the 18S-ITS1-5.8S-ITS2-28S region showed minimal genetic divergence (0–0.2 %) between mites from C. sorellus and those from other Calomys species. The observed morphological variations are consistent with previous findings of phenotypic plasticity in L. mazzai, potentially influenced by the host and/or environmental factors.
Prevalence, distribution and phylogenetic relationships of Bartonella in companion animals, wildlife and fleas from the Atlantic Forest ecoregion, Argentina
(Wiley, 2025) Urdarpilleta, Mara; Pech-May, Angélica; Lamattina, Daniela; Burgos, Eliana Florencia; Giuliani, Magalí Gabriela; Cortés, María Micaela; Espinoza Carniglia, Mario Virgilio; Salomón, Oscar Daniel; Lareschi, Marcela
The aim of this study was to analyse the prevalence and distribution of Bartonella species in companion animals, wildlife and their associated fleas in different landscapes of the Atlantic Forest ecoregion of Argentina, and to analyse the phylogenetic relationships between the Bartonella species identified in this study in addition to those found in other regions available in GenBank. A total of 257 mammals, including rodents, opossums, dogs and cats, were examined to detect the presence of Bartonella in both fleas and host tissues. The study revealed the presence of Bartonella in rodent fleas (47.7%), opossum fleas (7.8%), rodent spleens (6.5%) and cat blood (10%). Analysis of 15 gltA gene fragments revealed the existence of at least three different genotypes and eight haplotypes. Genetic analysis has established a close association between Bartonella species from mammals and fleas in both the Atlantic Forest of Brazil and the Costanera Sur Reserve in Argentina. Bartonella henselae (Regnery et al.) Brenner et al. (Hyphomicrobiales: Bartonellaceae) was identified in three rodent species: Rattus rattus (L.; Muridae), Akodon montensis Thomas (Cricetidae) and Calomys tener Winge (Cricetidae). This marks the first report of B. henselae in R. rattus in Argentina, as well as the initial documentation of its association with A. montensis and C. tener. Additionally, Bartonella clarridgeiae Lawson and Collins (Hyphomicrobiales: Bartonellaceae) was identified in feline blood and in fleas from dogs and cats. These findings are particularly relevant in the context of areas undergoing deforestation, where interactions between wild and domestic hosts increase the risk of zoonotic disease transmission. A One Health approach is crucial to understand transmission dynamics and to address the challenges posed by fleas as infection amplifiers and spillover phenomena. These present significant challenges for public health and biodiversity conservation.
New insights into the phylogeny of Laelapinae mites (Mesostigmata: Laelapidae) associated with sigmodontine rodents (Cricetidae) from Argentina, with a morphological characterization of two species of Mysolaelaps Fonseca, 1936
(MagnoliaPress via Plazi, 2026) Savchenko, Ekaterina; Espinoza Carniglia, Mario Virgilio; Lareschi, Marcela
Mites of the subfamily Laelapinae parasitic on small mammals are remarkably diverse in the Neotropics. Within this subfamily, mites of the genus Mysolaelaps Fonseca, 1936 are endemic to the Neotropics and frequently associated with rodents of the tribe Oryzomyini (Cricetidae: Sigmodontinae). Currently, Mysolaelaps comprises three described species, exclusively on the bases of their morphology. This study aimed to provide molecular information of Mysolaelaps microspinosus Fonseca, 1936 and Mysolaelaps parvispinosus Fonseca, 1936 and analyze their phylogenetic relationships to other Laelapinae mites associated with rodents. Thirty-six mites were collected from Oligoryzomys flavescens (Waterhouse, 1837) from Argentina. Among them, 18 mites were identified as M. microspinosus and 18 as M. parvispinosus. A subsample of mites was submitted to DNA extraction and amplification of the nuclear region 18S-ITS1-5.8S-ITS2. The phylogenetic analyses indicated a closer relationship between Mysolaelaps and Laelaps Koch, 1836 than with mites of the genus Androlaelaps Berlese, 1903 and Gigantolaelaps Nesbitt, 1951. The present study highlighted the scarcity of information regarding the molecular biology of the genus Mysolaelaps and the importance of further molecular studies for understanding the evolutionary history of laelapid mites.