Keyword: dieta

What brown-nosed coatis (Nasua nasua) eat in the concrete jungle of midwest Brazilian?

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The brown-nosed coati (Nasua nasua) is a Procyonid mesocarnivore commonly found coexisting with people in Brazilian urban forest fragments. Here, we aimed to assess the diet of brown-nosed coatis in two urban forest fragments of Campo Grande, MS: Parque Estadual do Prosa (PEP), a protected area, and Air Force Village (AFV), an urbanized area with physical barriers such as walls and fences. The diet was analyzed based on feces of brown-nosed coatis captured in wire traps during campaigns conducted from March to November 2018, January to April 2019, and March to June 2020 (only PEP), with 10 consecutive days per monthly campaign. Once captured, animals were sedated and identified, and fecal samples were collected and analyzed macrocospically and microscopically. In total, 190 coatis were sampled (including 115 females, 65 males, and 10 unidentified individuals), with some individuals being recaptured during the study period, and a total of 510 items were identified across both areas, with PEP showing 238 items (average of 2.4 items/fecal sample) and AFV showing 272 items (average of 3.8 items/fecal sample). In PEP, the diet of the coatis consisted mainly of invertebrates (57.6%), with human-derived food residues (HDFR), such as paper and string, representing 7.1% of the diet. In AFV, invertebrates dominated the diet (98.6%), with HDFR comprising 12.9% of the diet. Therefore, HDFR was present in the diet of brown-nosed coatis in both studied areas, with AFV showing nearly double the percentage compared to PEP. This study highlights that in urban environments, the diet of these animals can include HDFR, although their diet is still dominated by natural food resources. It remains to find out the impact that such intake of HDFR (nearly 3% of the diet based on Po) can have on the health of N. nasua individuals inhabiting urban environments.

O que quatis (Nasua nasua) comem em uma floresta de concreto no centro-oeste brasileiro? O quati (Nasua nasua) é um mesocarnívoro Procyonidae, comumente encontrado coexistindo com pessoas em fragmentos florestais urbanos brasileiros. Aqui, temos como objetivo acessar a dieta de quati em dois fragmentos florestais urbanos de Campo Grande, MS: Parque Estadual do Prosa (PEP), uma área protegida, e Vila da Base Aérea (AFV), uma área urbanizada com barreiras físicas como muros e cercas. A dieta foi analisada com base nas fezes de quatis capturados em gaiolas durante as campanhas conduzidas de março a novembro de 2018, de janeiro a abril de 2019 e de março a junho de 2020 (apenas no PEP), com 10 dias consecutivos por mês por campanha. Uma vez capturados, os animais foram sedados, identificados e amostras de fezes foram coletadas e analisadas macro e microscopicamente. No total, 190 quatis foram amostrados (incluindo 115 fêmeas, 65 machos e 10 indivíduos não identificados), com alguns indivíduos sendo recapturados durante o período de estudo e um total de 510 itens identificados entre as duas áreas, com PEP tendo 238 itens (média de 2,4 itens/amostra fecal) e AFV com 272 (média de 3,8 itens/amostra fecal). No PEP, a dieta dos quatis consistiu principalmente de frutas (91,4%), com resíduos derivados de comida humana (HDFR), como papel e barbante, representando 2,94% da dieta. Na AFV, frutas dominaram a dieta (94,4%), com HDFR consistindo em 3,3% da dieta. Então há a presença de resíduos relacionados com comida humana na dieta dos quatis nas duas áreas, sendo AFV com quase o dobro de porcentagem de itens comparado ao PEP. Esse estudo ressaltou que a dieta desses animais em ambiente urbano e a habilidade de utilizar recursos disponíveis em áreas habitadas por humanos.

Graphical abstract for the article “What brown-nosed coatis (Nasua nasua) eat in the concrete jungle of midwest Brazilian?” (G. E. O. Porfirio et al., 2026)

Variación espacial y temporal de la dieta de la zorra gris (Urocyon cinereoargenteus: Carnivora, Canidae) en Santiago Ixtaltepec, Asunción Nochixtlán, Oaxaca, México

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La evaluación de la dieta de mesocarnívoros generalistas es esencial para comprender su papel ecológico y su capacidad de adaptación en ambientes heterogéneos. En este estudio se caracterizó la variación de la dieta de la zorra gris (Urocyon cinereoargenteus) a través del análisis y registro de heces en tres tipos de cobertura vegetal (bosque de encino, vegetación riparia y zona antropizada) en Santiago Ixtaltepec, Asunción Nochixtlán, Oaxaca, México, durante las temporadas climáticas de lluvias y sequía. Se colectaron y analizaron 247 heces, y se identificaron 14 componentes alimenticios agrupados en cinco categorías. La dieta estuvo dominada por frutos, con la mayor frecuencia de ocurrencia (59,52%), particularmente Juniperus sp., seguida por insectos (31,57%), principalmente ortópteros y coleópteros. Aves, mamíferos y quilópodos tuvieron un porcentaje de representación menor. Se registra por primera vez en Oaxaca el consumo de los frutos de Juniperus sp., Quercus sp., Prunus sp., larvas Phyllophaga sp. y del roedor Reithrodontomys sp. El índice de Shannon y la amplitud de nicho de Levins indicaron mayor diversidad y amplitud trófica en la temporada de lluvias que en la de sequía, lo que refleja la disponibilidad estacional de recursos. Los resultados evidencian la plasticidad trófica de U. cinereoargenteus y su papel en la dispersión de semillas y control de invertebrados, y resalta la importancia de conservar la heterogeneidad del paisaje para mantener la funcionalidad ecológica de la especie.

Spatial and temporal variation of the diet of the gray fox (Urocyon cinereoargenteus: Carnivora, Canidae) in Ssantiago Ixtaltepec, Asunción Nochixtlán, Oaxaca, Mexico. Evaluating the diet of generalist mesocarnivores is essential to understanding their ecological role and adaptive capacity within heterogeneous environments. This study characterized the dietary variation of the gray fox (Urocyon cinereoargenteus) through the analysis of fecal samples across three land-cover types (oak forest, riparian vegetation, and anthropized area) in Santiago Ixtaltepec, Asunción Nochixtlán, Oaxaca, Mexico, during the rainy and dry seasons. A total of 247 scats were collected and analyzed, identifying 14 food items classiffied into five categories. The diet was predominantly frugivorous, showing the highest frequency of occurrence (59.52%), particularly Juniperus sp., followed by insects (31.57%), primarily orthopterans and coleopterans. Birds, mammals, and chilopods represented a minor portion of the diet. This study provides the first record in Oaxaca of the consumption of the fruits of Juniperus sp., Quercus sp., Prunus sp., Phyllophaga sp. larvae, and the rodent Reithrodontomys sp. The Shannon’s diversity index and Levins’s niche breadth indicated greater trophic diversity and niche breadth during the rainy season compared to the dry season, reflecting the seasonal resource availability. These results demonstrate the trophic plasticity of U. cinereoargenteus and its role in seed dispersal and invertebrate control, highlighting the importance of preserving landscape heterogeneity to maintain the ecological functionality of the species.

Graphical abstract for the article “Variación espacial y temporal de la dieta de la zorra gris (Urocyon cinereoargenteus: Carnivora, Canidae) en Santiago Ixtaltepec, Asunción Nochixtlán, Oaxaca, México” (I. Gaytán-Velasco & A. Santos-Moreno, 2026)

Guia básico para o uso de isótopos estáveis no estudo da ecologia de mamíferos

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A análise de isótopos estáveis é uma aliada no estudo de espécies de difícil observação na natureza, bem como de espécies que se encontram extintas atualmente, superando algumas limitações de técnicas mais tradicionais. Isótopos comumente utilizados em ecologia isotópica de mamíferos viventes e fósseis incluem os de nitrogênio (δ15N), carbono (δ13C) e oxigênio (δ18O), os quais refletem o alimento e a água ingeridos e assimilados durante o processo de síntese dos tecidos biológicos. Entretanto, é importante um bom planejamento amostral e analítico para evitar interpretações ecológicas errôneas. Nesta revisão, abordamos os princípios da técnica de isótopos estáveis, suas principais aplicações e recomendações para o preparo de amostras, análise e interpretação dos dados. Por fim, citamos alguns avanços metodológicos e perspectivas que têm permitido obter uma reconstrução cada vez mais refinada dos hábitos alimentares e até mesmo dos movimentos migratórios de animais. Particularmente, a equipagem de universidades brasileiras e outros centros de pesquisa com espectrômetros de massa tem proporcionado uma acessibilidade cada vez maior a essa ferramenta. Esperamos que a ciência brasileira acompanhe tais avanços e que este guia seja útil para todos os pesquisadores que desejarem iniciar na área de ecologia isotópica.

Basic guide to the application of stable isotopes in mammalian ecology. The analysis of stable isotopes is an ally in the study of species that are difficult to observe in nature, as well as species that are currently extinct, overcoming some limitations of more traditional techniques. Isotopes commonly used in the isotopic ecology of living and fossil mammals include nitrogen (δ15N), carbon (δ13C), and oxygen (δ18O), which reflect the food and water ingested and assimilated during the synthesis of biological tissues. However, it is important to have proper sampling and analytical planning to avoid erroneous ecological interpretations. In this review, we address the principles of the stable isotope technique, its main applications, and recommendations for sample preparation, data analysis, and interpretation. Finally, we mention some methodological advances and perspectives that have allowed for an increasingly refined reconstruction of dietary habits and even migratory movements of animals. Particularly, the equipment available in Brazilian universities and other research centers with mass spectrometers has provided greater accessibility to this tool. We hope that Brazilian science keeps pace with such advances and that this guide proves useful for all researchers wishing to start in the field of isotopic ecology.

Graphical abstract for the article “Guia básico para o uso de isótopos estáveis no estudo da ecologia de mamíferos” (Carrasco & de Lima, 2026)

Ecological implications of the dietary habits of the wild boar in temperate subantarctic forests: a new perspective

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The wild boar, an exotic species in South American temperate forests, has shown an expanding distribution; however, their diet remains largely elusive. This study aimed to fill this gap by examining the diet of wild boars in new locations and seasons in Chile. We analyzed the contents of 35 wild boar stomachs, identifying and quantifying the occurrence of animal, plant, and fungi items. Our results revealed a diverse diet, with plant species representing 54.5% of the diet, fungi 7%, and animals 38.1%. The most consumed species were Gunnera tinctoria (45.7%), Hylamorpha elegans (25.7%), and Gevuina avellana (17.1%). Interestingly, we found that the consumption of fungal species occurred primarily in winter and spring. Conversely, wild boars were observed to consume vegetables predominantly during winter and autumn, shifting to a higher percentage of animal species in spring and summer. We found that 89.9% of the diet of the wild boar consisted of native elements, suggesting an extensive use of food resources within the temperate rainforest. Alarmingly, our study also identified the consumption of endangered species: Chiasognathus grantii, Acanthinodera cumminguii. The predation of the endangered Dromiciops gliroides and Eupsophus roseus is not conclusive. Our study provides new insights into the dietary habits of the wild boar in Chile and highlights its extensive use of native food resources, including several endangered species, and underscores the potential ecological impact of the expanding distribution of the wild boar, suggesting a significant threat to the conservation of these species. Further research is needed to fully understand the ecological implications of these findings and to develop effective management strategies.

Implicancias ecológicas de los hábitos dietarios del jabalí en bosques templados subantárticos: una nueva perspectiva. El jabalí, especie exótica, expande su distribución en los bosques templados de América del Sur; sin embargo, su dieta sigue siendo en gran medida desconocida. El presente estudio tuvo como objetivo llenar este vacío, examinando la dieta de jabalíes en nuevas ubicaciones y temporadas en Chile. Analizamos el contenido de 35 estómagos de jabalí, e identificamos y cuantificamos la presencia de elementos animales, vegetales y fúngicos. Nuestros resultados revelaron una dieta diversa, con especies vegetales que representan el 54,5% de esta, hongos el 7% y animales el 38,1%. Las especies más consumidas fueron Gunnera tinctoria (45,7%), Hylamorpha elegans (25,7%) y Gevuina avellana (17,1%). Curiosamente, encontramos que el consumo de hongos se produjo principalmente en invierno y primavera. Por el contrario, se observó que los jabalíes consumían vegetales predominantemente durante el invierno y el otoño, pasando a un mayor porcentaje de especies animales en primavera y verano. Encontramos que el 89,9% de la dieta del jabalí consistía en elementos nativos, lo que sugiere un uso extensivo de los recursos alimentarios dentro del bosque lluvioso templado. De manera preocupante, nuestro estudio también identificó el consumo de especies en peligro de extinción, como Chiasognathus grantii y Acanthinodera cumminguii. La depredación sobre Dromiciops gliroides y Eupsophus roseus no es concluyente. Nuestro estudio destaca el uso extensivo de recursos alimentarios nativos, incluidas varias especies en peligro de extinción, lo que sugiere una amenaza significativa para la conservación de estas especies. Se necesitan más investigaciones para comprender completamente las implicaciones ecológicas de estos hallazgos y desarrollar estrategias de gestión efectivas.

Graphical abstract for the article "Ecological implications of the dietary habits of the wild boar in temperate subantarctic forests: a new perspective" (Skewes et al., 2025)

Trophic ecology of Geoffroy’s cat (Leopardus geoffroyi) and mammal prey availability in semi-arid environments of central Patagonia, Argentina

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Research on the dietary composition of felids can help improve the perception of rural workers and their tolerance towards this group, which is threatened by human-wildlife conflicts. In this context, the purpose of this study was to quantify the diet of Leopardus geoffroyi in Península Valdés (Patagonia, Argentina) to obtain baseline knowledge of the species’ dietary habits, trophic ecology, and degree of prey consumption. To this end, 160 fresh scat samples, collected from 2013 to 2016, were analyzed. Ten mammal species, one tinamou bird, one lizard genus, and one insect order were identified. The most frequently consumed prey (63.84%) were small-sized mammals (< 1 kg), accounting for the highest biomass contribution (37.2%). The frequency of each mammal species in the diet was not correlated with their capture frequency (measured through Sherman live traps and pedestrian diurnal transects). This study is the first to report on the diet of L. geoffroyi in Argentinean central Patagonia, and it provides information not only on ecological aspects but also on the natural history of this felid species.

Ecología trófica del gato montés (Leopardus geoffroyi) y disponibilidad de presas de mamíferos en ambientes semiáridos de la Patagonia central, Argentina. La investigación sobre la composición de la dieta de los felinos puede ayudar a mejorar la percepción y la tolerancia de los trabajadores rurales hacia esta especie de carnívoro felino que se ve amenazada por el conflicto entre humano-vida silvestre. En este contexto, el propósito de este estudio fue cuantificar la dieta de Leopardus geoffroyi en Península Valdés (Patagonia, Argentina) con la finalidad de obtener un conocimiento básico sobre la ecología trófica y el grado de consumo de presas. Para ello, se analizaron 160 muestras de heces frescas recogidas entre 2013 y 2016. Se identificaron 10 especies de mamíferos, una especie de tinamú, un género de lagarto y un orden de insecto. Se encontró que las presas consumidas con mayor frecuencia (63.84%) eran los mamíferos de pequeño tamaño (< 1 kg) que, a su vez, representaron la mayor contribución de biomasa (37.2%). La frecuencia de cada especie de mamífero en la dieta no se correlacionó con su frecuencia de captura (medida a través de trampas de captura viva tipo Sherman y transectos diurnos pedestres). Este trabajo es la primera aproximación a la dieta de L. geoffroyi realizada en la Patagonia central argentina y aporta conocimientos no solo sobre aspectos ecológicos, sino también sobre la historia natural de esta especie de felino.

Graphical abstract for the article “Trophic ecology of Geoffroy’s cat (Leopardus geoffroyi) and mammal prey availability in semi-arid environments of central Patagonia, Argentina” (D'Agostino & Udrizar Sauthier, 2024)

Ecological aspects of Dasypus pastasae in the Colombian Altillanura, with comments on activity patterns and its identification via camera traps

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The Pastaza greater long-nosed armadillo (Dasypus pastasae) is a recently revalidated species and therefore poorly studied from South America. The natural history of this species is virtually unknown in the wild. Here, we describe ecological aspects of D. pastasae including activity patterns, behavioral notes, endoparasite records, and diet information retrieved from riparian forest populations in the eastern plains of Colombia. Additionally, we point out key morphological traits to differentiate D. pastasae from other congeneric armadillos present in Colombia based on camera trap records.

Aspectos ecológicos de Dasypus pastasae en la altillanura colombiana, con comentarios sobre patrones de actividad e identificación en cámaras trampa. El armadillo espuelón (Dasypus pastasae) es una especie recientemente revalidada y poco estudiada de América del Sur. La historia natural del espuelón es prácticamente desconocida y son muy escasos los datos de esta especie en vida silvestre. El presente trabajo describe diversos aspectos sobre la historia natural de esta especie, incluyendo patrones de actividad, notas sobre su comportamiento, endoparásitos, así como anotaciones sobre su dieta de poblaciones en bosques riparios de los Llanos orientales en Colombia. Además, destacamos aspectos de su morfología, útiles para diferenciar D. pastasae de otros armadillos presentes en Colombia basados en registros de cámaras trampa.

Graphical abstract for the article “Ecological aspects of Dasypus pastasae in the Colombian Altillanura, with comments on activity patterns and its identification via camera traps” (Aya-Cuero et al., 2021)

Dieta del zorro culpeo Lycalopex culpaeus (Molina, 1782) durante la megasequía de Chile central: rol del ganado y evidencia de una alta interacción trófica entre mamíferos carnívoros

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Chile ha experimentado una extensa sequía, la que ha sido sostenida desde el año 2010. En este contexto nosotros realizamos un estudio trófico en Lycalopex culpaeus, en la zona mediterránea chilena, en medio de este evento climático extremo, para analizar cómo este fenómeno de restricción en disponibilidad de recursos tróficos afecta la dieta del culpeo. El análisis de fecas permite observar que L. culpaeus sustentó su dieta en el consumo de lagomorfos y de ganado, probablemente muerto. Durante este periodo no se registraron cambios en la actividad de los zorros. Otro aspecto interesante fue la presencia sostenida de mamíferos carnívoros en las fecas a lo largo del año; esto último sostiene lo observado en otras regiones respecto a lo comunes que serían las muertes interespecíficas entre mamíferos carnívoros.

Diet of culpeo fox Lycalopex culpaeus (Molina, 1782) during the mega-drought of central Chile: role of cattle and evidence of a high trophic interaction between carnivorous mammals. Chile has experienced a strong drought, which has been sustained since 2010. In this context, we conducted a trophic study for Lycalopex culpaeus, in the Chilean Mediterranean area, during this extreme climatic event, to analyze how this phenomenon of restriction in the availability of trophic resources affects the diet of these foxes. The analysis of feces allows us to observe that L. culpaeus based its diet on lagomorphs and on the use of cattle, probably dead. During the study there was no change in foxes activity. Another interesting aspect was the sustained presence of carnivorous mammals in the feces throughout the year; the latter supports what has been observed in other regions, in that interspecific kills are common among carnivorous mammals.

Predation of the black-and-white tegu (Salvator merianae) by the lesser grison (Galictis cuja)

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This study describes the hunting and predatory behavior of the lesser grison on an adult black-and-white tegu as recorded by camera traps in an Atlantic forest remnant in the União Biological Reserve (Rio das Ostras, RJ, Brazil). This is the first record of a mustelid preying on this large lizard species and the first direct record of a hunting event of S. merianae by a mammal. The observed hunting behavior is heavily based on olfactory search, and the long struggle to kill and remove the prey from a burrow is described.

Predação de teiú Salvator merianae por furão-pequeno Galictis cuja. Neste trabalho descrevemos o comportamento de caça e predação de um lagarto Salvator merianae adulto pelo furão-pequeno, registrado por armadilhas-fotográficas na Reserva Biológica União (Rio das Ostras, RJ, Brasil). Este é o primeiro registro de um mustelídeo predando esta espécie de lagarto, e o primeiro registro direto de um evento de caça de S. merianae por um mamífero. São descritos o comportamento de caça baseado na busca olfativa e a longa luta até a morte e retirada da presa de dentro de um buraco no solo.

Digestión diferencial de presas y dieta: el caso del delfín franciscana (Pontoporia blainvillei)

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El delfín franciscana (Pontoporia blainvillei) es el cetáceo más amenazado del Atlántico Sudoccidental. Conocer su biología es esencial para promover medidas medidas que permitan mitigar su captura incidental y estudiar su dieta, contribuyendo al conocimiento de su ecología. La mayoría de los estudios de dieta son realizados a partir de restos duros encontrados en contenidos estomacales con distintos grados de digestión y retención, llevando a sobrestimación o subestimación de presas. Sin embargo, el análisis de la fracción fresca del contenido estomacal es una metodología implementada en predadores marinos cuya dieta es dominada por invertebrados de rápida digestión, método independiente de los efectos de digestión y acumulación de restos duros cuantificables. Se realizó un análisis de dieta de Pontoporia blainvillei considerando por separado la fracción fresca y los restos duros, con el objetivo de determinar diferencias entre estos métodos que evidenciaran el efecto de la digestión diferencial y la acumulación de restos duros con valor taxonómico. El análisis de 41 contenidos estomacales mostró diferencias entre ambos métodos de estudio, demostrando retención de mandíbulas de Loligo sanpaulensis, y otolitos sagitta de Cynoscion guatucupa, sobreestimando así su importancia; y una homogénea digestión de Engraulis anchoita y Trachurus lathami, subestimando su importancia. Este trabajo aporta evidencias de retención y digestión diferencial de presas que implican cambios en la caracterización de los hábitos tróficos de la especie, su nutrición y el grado de solapamiento con las pesquerías de la región. Siendo esto último importante en una especie con elevada tasa de mortalidad accidental en redes de pesca, como es el caso del delfín franciscana.

Differential prey digestion and diet: the case of the franciscana dolphin (Pontoporia blainvillei). The Franciscana dolphin is the most endangered cetacean in the Southwestern Atlantic Ocean. Knowing its biology and ecology is crucial to promote measures to prevent its bycatch, and the study of its diet contributes to the knowledge of its ecology. However, most of these studies are performed from hard remains found in stomach contents and these contents have different digestion and retention rates, which could lead to an overestimation of some prey. However, the analysis of undigested portions of the stomach content is implemented in marine predators whose diet consists in rapid digestion invertebrates. This method avoids the effect of digestion and accumulation of measurable hard remains. Consequently, an analysis of the P. blainvillei diet was performed in order to determine differences between both diet study methods, which allow to determine the effect of the differential digestion of prey and the accumulation of hard remains with taxonomic value. The study was conducted on 41 stomach contents, whose results showed great differences in the diet following both methods. Indigestible beaks of Loligo sanpaulensis and robust sagittal otoliths of Cynoscion guatucupa accumulate in the stomach, and thus, overestimate the importance of these prey. Moreover, the analysis evidence a rapid digestion of Engraulis anchoita and Trachurus lathami, which are underestimated. In turn, the results suggest changes in the characterization of trophic habits of P. blainvillei, in its nutrition, and in the degree of overlapping with the fisheries of the area. This latter one is crucial for the Franciscana dolphin because of the high accidental mortality rate in fishing nets.

First record of Glyphonycteris sylvestris Thomas, 1896 (Chiroptera: Phyllostomidae: Glyphonycterinae) for Argentina, with comments on its karyotype

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Glyphonycteris is a poorly known genus of bats that inhabit lowlands and forested mountains of Central and South America. This genus comprises three nominal species, with G. sylvestris being the most widely distributed species in South America. The karyological data previously available for this genus are restricted to those resulting from conventional staining techniques applied to a few specimens from Surinam. Here, we report the first record of G. sylvestris in Argentina extending its southern distribution. Moreover, our new locality represents the seventh record from the Atlantic Forests Biome and the first from Araucaria Moist Forest ecoregions. Our specimen overall exhibits the diagnostic characteristics described for the species except for some differences in the distribution of hairs on the wings and limbs. The fecal sample obtained from our specimen contained only seeds of Piper aduncum. The karyotype was 2n = 22 with a FN = 42; the analysis of fluorochrome banding patterns in the chromosomal pericentromeric regions shows DAPI (4,6-diamidino-2-phenylindole) positive blocks in pairs 5 and 8, whereas pericentromeric regions stained with CMA3 (Chromomicine A3) are positive in pairs 1, 2, 3, 4 and 11. Moreover, the interstitial region of chromosomes shows DAPI and CMA3 positive blocks in pairs 1, 2, 3, 4 and 5. These karyological data are novel to G. sylvestris, contributing to the scarce knowledge of the genus. Thus filling blanks of information and enabling further comparative chromosome analysis.

Primer registro de Glyphonycteris sylvestris Thomas, 1896 (Chiroptera: Phyllostomidae: Glyphonycterinae) para Argentina, con comentarios sobre su cariotipo. Glyphonycteris es un género poco conocido de murciélago que habita los bosques de tierras bajas y de montañas de Centroamérica y Sudamérica. Este género incluye tres especies nominales, donde G. sylvestris es la más ampliamente distribuida al sur de Sudamérica. Los datos de cariotipo para este género están restringidos a técnicas de tinción convencional realizadas sobre unos pocos especímenes de Surinam. En este trabajo se presenta el primer registro de G. sylvestris en Argentina, extendiendo su distribución sur. Además, esta nueva localidad representa el séptimo registro para el Bioma del Bosque Atlántico y el primero para la ecorregión de los Bosques Húmedos de Araucaria. Nuestro espécimen exhibe los caracteres diagnósticos para la especie excepto por algunas diferencias en la distribución de los pelos en alas y miembros. La muestra fecal obtenida de nuestro espécimen solo contenía semillas de Piper aduncum. El cariotipo tuvo un 2n = 22 y FN = 42; los patrones de bandeo con fluorocromos en la región pericentromérica muestra bloques de DAPI (4,6-diamino-2-fenilindol) positivo en los pares 5 y 8, mientras que las regiones pericentroméricas teñidas con CMA3 (Chromomicina A3) son positivas en los pares 1, 2, 3, 4 y 11. Además, en las regiones intersticiales de los cromosomas se observaron bloques DAPI y CMA3 positivos en los pares 1, 2, 3, 4 y 5. Estos datos cariológicos son novedosos para G. sylvestris, contribuyendo al escaso conocimiento del género. Por ende, llenan un vacío de información que permitiría futuros análisis cromosómicos comparativos.