Naturalis

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

Communities in Naturalis

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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

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.
Communities of ectoparasites associated with cricetid rodents in Pereyra Iraola Biosphere Reserve, Argentina, with an analysis of Rickettsia infection
(Sociedad Entomológica Argentina, 2025-03-31) Melis, Mauricio Ezequiel; Espinoza Carniglia, Mario Virgilio; Paolocá, Iván; Savchenko, Ekaterina; Costa, Mariel D.; Balcazar, Darío; Galliari, Carlos Alberto; Nava, Santiago; Lareschi, Marcela
Cricetid rodents are associated with ectoparasites, which are components of biodiversity. They may also cause diseases and act as potential vectors of microorganisms. The Pereyra Iraola Park (PPI) is situated in the area of greatest biodiversity of Buenos Aires Province. Our goal was to characterize the communities of ectoparasites associated with cricetids from the Ecological Santa Elena Farm, situated at the PPI, and to analyze the presence of Rickettsia spp. in these arthropods. Samplings were conducted during 2017-2018. A subsample of ectoparasites was prepared and identified with the optical microscope, and others were subjected to molecular analysis using the PCR technique in search of Rickettsia spp. A total of 106 cri-cetids were trapped, and 865 ectoparasites were collected. Mesostigmata mites presented the highest rich-ness and diversity of species, abundance and prevalence; fleas presented higher values than ticks. These results agree with researches from nearby localities. Only the fleas Polygenis (P.) atopus (Jordan & Roth-schild) and Polygenis (P.) a. axius (Jordan & Rothschild) were positive for Rickettsia, with sequences cor-responding to Rickettsia felis, while mites and ticks were negative. The results obtained contribute to the knowledge of the biodiversity of the PPI and to the zoonotic importance of its fauna.
Espinoza Carniglia, Mario Virgilio
Are Rattus rattus fleas invasive? Evaluation of flea communities in invasive and native rodents in Chile
(Wiley, 2024-07-03) Lizama‐Schmeisser, Nicol; de Castro, Elaine Serafin; Espinoza‐Carniglia, Mario; Herrera, Yessica; Silva‐de La Fuente, María Carolina; Lareschi, Marcela; Moreno-Salas, Lucila
Co-invasion, characterized by the simultaneous introduction of hosts and parasites with the latter establishing themselves in native hosts, is a phenomenon of ecological concern. Rattus rattus, a notorious invasive species, has driven the extinction and displacement of numerous avian and mammalian species and serves as a key vector for diseases affecting both humans and wildlife. Among the parasites hosted by R. rattus are fleas, which exhibit obligate parasitic behaviour, a generalist nature and high prevalence, increasing the likelihood of flea invasion. Simultaneously, invasive species can serve as hosts for native parasites, leading to potential amplification or dilution of parasite populations in the environment. In Chile, R. rattus has been present since the 17th century because of the arrival of the Spanish colonizers through the ports and has spread throughout urban, rural and wild Chilean territories. This study aims to evaluate whether co-invasion of native fleas of invasive rats occurs on native rodents in Chile and to determine whether black rats have acquired flea native to Chile during their invasion. For this, we captured 1132 rodents from 26 localities (20 S–53 S). Rattus rattus was found coexisting with 11 native rodent species and two species of introduced rodents. Among the native rodents, Abrothrix olivacea and Oligoryzomys longicaudatus exhibited more extensive sympatry with R. rattus. We identified 14 flea species associated with R. rattus, of which only three were native to rats: Xenopsylla cheopis, Leptopsylla segnis and Nosopsyllus fasciatus. These three species presented a higher parasite load in black rats compared to native fleas. Leptopsylla segnis and N. fasciatus were also found associated with native rodent species that cohabit with R. rattus. The remaining species associated with R. rattus were fleas of native rodents, although they were less abundant compared to those associated with native rodents, except for Neotyphloceras pardinasi and Sphinctopsylla ares. Although there has been evidence of flea transmission from rats to native species, the prevalence and abundance were relatively low. Therefore, it cannot be definitively concluded that these fleas have established themselves in native rodent populations, and hence, they cannot be classified as invasive fleas. This study underscores R. rattus’ adaptability to diverse environmental and geographical conditions in Chile, including its capacity to acquire fleas from native rodents. This aspect has critical implications for public health, potentially facilitating the spread of pathogens across various habitats where these rats are found.
Fleas (Insecta: Siphonaptera) of Peru: A Review of Their Diversity and the Host Specificity in the Country
(MDPI AG, 2024-12-13) Flores-Bancayan, Carolina; Pellón, Juan J.; Iannacone, José; Lareschi, Marcela; Minaya, Davis; Flores-Bancayan, Carolina; Lannacone, José; Lareschi, Marcela; Minaya, Davis; Pellón, Juan J.
In the Neotropical biogeographic region, there are about 290 known species and subspecies of fleas, which have as their main hosts to the rodent subfamily Sigmodontinae. In Peru, more than 22 years have passed since the last list of known flea species was published. This study presents a review and update of the fleas recorded in Peru from 1908 to 2024. This list contains information on the flea species, including their known hosts, the localities in Peru where they were reported, the main references and some comments. In addition, the specificity of flea–host interactions was assessed using an interaction network approach. In the literature review, 86 flea species were found distributed among 9 families, 34 genera and 19 subspecies. These fleas were recorded parasitizing at least71 species of mammals and birds (14 orders, 28 families, 54 genera), 15 reported only at the genera level and seven undetermined ones. The flea–host interaction network exhibited a modular structure, indicating that these interactions tend to be specialized. A sigmodontine rodent (Akodon mollis) and a Rhopalopsyllidae flea (Polygenis litargus) were highly connected across modules and the overall network, and thus were important to maintain the structure. This review contributes to the knowledge of fleas in Peru, synthesizing the scattered information and providing information on the interaction they have with their hosts.