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

Jurassic Osmundaceous Landscapes in Patagonia: Exploring the Concept of Ecological Stasis in the Deseado Massif, Argentina
(MDPI AG, 2025-01-08) Nunes, Giovanni C.; García Massini, Juan L.; Yánez, Agustina; Escapa, Ignacio Hernán; Guido, Diego Martín
Herein, we report the presence of a plant paleocommunity, dominated by ferns of the family Osmundaceae, structurally preserved from the only known Mesozoic, fossiliferous geothermal deposits, from the La Matilde Formation (Middle-Upper Jurassic) in the Deseado Massif of Southern Patagonia, Argentina. A total of 13 siliceous chert blocks sampled in an area of approximately 250 m2, preserving a monotypic assemblage dominated by Osmundaceae embedded within its original swampy substrate, are documented. Additional Osmundaceae and fewer ferns and conifers are present in the stratigraphically continuous, adjacent chert levels. This association is comparable to those dominated by Osmundaceae in modern swampy settings, such as in high-altitude lagoons in the Paraná Forest in Northeastern Argentina. In addition, a diverse community of mutualistic, parasitic, and saprotrophic microorganisms associated with the ferns and conifers in the assemblage is present. These compositional, paleoenvironmental, and trophic characteristics of the Jurassic Osmundaceae suggest a possible case of ecological stasis, where Osmundaceae-dominated plant communities apparently persisted in swamps of comparable structures, functions, and physical characteristics for over 150 million years. This suggests that Osmundaceae formed similar communities in compatible settings in the Jurassic, becoming preserved in analogous configurations.
A gondwanan Jurassic bryoflora? Anatomically preserved bryophytes in geothermal paleoenvironments from the Jurassic of Patagonia, Argentina
(Elsevier BV, 2025-06) Bippus, Alexander C.; Savoretti, María Adolfina; Escapa, Ignacio Hernán; García Massini, Juan L.; Guido, Diego Martín
The Deseado Massif, which is located in the western part of the Santa Cruz Province, Argentina, contains numerous hot spring deposits related to the final stages of the Bahía Laura Complex. The aim of this study is to analyze the first Jurassic deposits with permineralized bryophytes at La Bajada hot spring-related locality, expanding the diversity of Jurassic bryophytes with anatomical preservation. >200 fossiliferous petrographic thin sections were examined, leading to the discovery of four bryophyte morphotypes of leafy and thallose gametophytes. Detailed comparisons between each morphotype and extant and extinct bryophytes were carried out. The morphotypes described here may have various phylogenetic affinities, based on the latest comprehensive phylogenetic analyses of extant bryophytes. Although morphotypes described here do not represent the oldest representative for the lineages they represent, each of the studied fossils has a consistent set of diagnostic characters that relates them to specific nodes within bryophyte phylogeny. Moreover, the affinities of morphotype A with Marchantiales and Neohodgsoniales suggest affinities with the clade that is composed of these two orders together with Sphaerocarpales. Affinities of morphotypes B, C and D are more ample and related to different orders including within Bryophyta sensu stricto.
Cupressaceous woods in Jurassic geothermal deposits of the Deseado Massif, Patagonia, Argentina with evidence of nurse-log growth strategy
(Elsevier BV, 2025-11) Molano, Sebastian Alejandro; Nunes, Giovanni Cristian; Bodnar, Josefina; Escapa, Ignacio Hernán; García Massini, Juan L.; Guido, Diego Martín
The fossil wood record of Cupressaceae is extensive across the Mesozoic and Cenozoic, with a wide distribution in both hemispheres. However, the affinities of some fossil woods are uncertain due to incomplete descriptions, preservation issues, and anatomical traits of ambiguous interpretation. This study describes the anatomy and discusses the affinities of well-preserved Jurassic silicified woods. Samples were collected from geothermal deposits at the ‘Claudia’ locality in the Deseado Massif, Santa Cruz Province, Southern Patagonia, Argentina. The material corresponds to pycnoxylic and homoxylic secondary xylem characterized by a distinctive combination of traits, including mixed pitting on tracheids, cupressoid cross-field pits arranged in a cupressoid pattern, and abundant diffuse axial parenchyma. These characteristics are compatible with Protocupressinoxylon and suggest affinities with Cupressaceae. Additionally, chert blocks preserving fragments of these woods contain vegetative organs (e.g., leaves, roots) with affinities with this family, supporting the suggested affiliation. The studied woods are assigned to the open nomenclature Protocupressinoxylon-type wood, following the IAPT Fossil Committee’s recommendations concerning the nomenclature problems of this name, while acknowledging the extensive historical and current use of it. Nurse logs are also recorded based on the presence of several stems and rootlets anchored to some of the studied woods, which expands the fossil record of this growth strategy.
Fossil woods from the early Paleocene of the Cerro Bororó Formation (central Argentine Patagonia): systematics and palaeoenvironmental considerations
(Oxford University Press (OUP), 2025-04-14) Ruiz, Daniela Paula; Raigemborn, María Sol; Pujana, Roberto Román; Martínez, Leandro Carlos Alcides; Matheos, Sergio Daniel; Brea, Mariana
The Cerro Bororó Formation (Danian) crops out in the Bororó Hill in the centre of the Chubut Province (central Argentine Patagonia). Palaeontological studies on this formation are scarce, among them is Petriella [Estudio de maderas petrificadas del Terciario Inferior del área central de Chubut (Cerro Bororó). Revista del Museo de La Plata (Nueva Serie). Sección Paleontología 1972;4:159–254] who made the first and only descriptions of fossil woods from the Cerro Bororó Formation. We re-examined the six angiosperm fossil woods previously described by Petriella in the 1970s and analysed 10 additional samples. We studied the specimens under light and scanning electron microscopy. In addition, the angiosperm diversity, the growth rings, the mesomorphy and vulnerability indices, and the wood anatomical characteristics influenced by the environment were used to get a general idea of the conditions in which these trees would have grown. Our analyses revealed that the fossil wood assemblage includes Podocarpoxylon mazzonii and Brachyoxylon raritanense in the conifer fossiliferous level and Elaeocarpoxylon sloaneoides, Euxylophoroxylon chiquichanense, Laurinoxylon americanum comb. nov., Weinmannioxylon multiperforatum, and cf. Chalkoxylon sp. in the angiosperm fossiliferous level. These findings suggest that the region experienced a warm-temperate, humid climate, which agrees with previous studies of the Cerro Bororó Formation.
Maastrichtian climate of southern Patagonia (Argentina): An approach from paleosols of the dinosaur-bearing Chorrillo Formation
(Elsevier BV, 2025-10) Perez Loinaze, Valeria S.; Vera, Ezequiel I.; Manabe, Makoto; Tsuihiji, Takanobu; Sano, Takashi; Raigemborn, María Sol; Lizzoli, Sabrina; Moyano Paz, Damián; Varela, Augusto N.; Poiré, Daniel Gustavo; Novas, Fernando Emilio
The upper Maastrichtian dinosaur-bearing Chorrillo Formation in southern Patagonia (~50 S, Austral-Magallanes Basin, Argentina) preserves successions of paleosols dominated by vertic features (i.e., the Argentino Lake hydromorphic Vertisols, the Perito Moreno Glacier calcic Vertisols, the Anita Farm Vertisols, the Centinela River Histosols, and the Chorrillo Malo Farm argillic Vertisols). To shed new light on and improve our understanding of the climate conditions that prevailed in southern Patagonia prior to the K/Pg extinction event, we used bulk geochemistry of the Chorrillo Formation paleosols to quantitatively reconstruct the latest Cretaceous climate at midehigh paleolatitudes of the Southern Hemisphere and compare them with late Maastrichtian global climate data derived from paleosols-based geochemical records. Bulk geochemical data indicate that pedogenesis occurred under moderate chemical weathering rates, which operated in a humid climate with a thermic regime (temperate-subtropical). These conditions align with previous qualitative interpretations based on macro- and micromorphological and mineralogical analyses of these paleosols, as well as palynological analyses of the Chorrillo Formation, which further demonstrate seasonality in rainfall. The climate data presented here are consistent with global paleoclimate reconstructions, where our study area (paleo-54 S) lies within the Maastrichtian paleo-Kooppen climate zone “Temperate humid subtropical,” suggesting that during the Maastrichtian, subtropical conditions extended toward the poles by at least 22 of latitude in South America. This research provides new, relevant quantitative paleoclimatological data from the poorly constrained midehigh paleolatitudes of the Southern Hemisphere, refining current latest-Cretaceous climate reconstructions.