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Contreras F, Andreo V, Hechem V, Polop J, Provensal MC. Colilargo’s occupancy and the role of native and exotic plants in hantavirus expansion and transmission risk. MAMMAL RES 2023. [DOI: 10.1007/s13364-023-00671-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Spruill-Harrell B, Pérez-Umphrey A, Valdivieso-Torres L, Cao X, Owen RD, Jonsson CB. Impact of Predator Exclusion and Habitat on Seroprevalence of New World Orthohantavirus Harbored by Two Sympatric Rodents within the Interior Atlantic Forest. Viruses 2021; 13:1963. [PMID: 34696393 PMCID: PMC8538774 DOI: 10.3390/v13101963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/19/2021] [Accepted: 09/24/2021] [Indexed: 11/17/2022] Open
Abstract
Understanding how perturbations to trophic interactions influence virus-host dynamics is essential in the face of ongoing biodiversity loss and the continued emergence of RNA viruses and their associated zoonoses. Herein, we investigated the role of predator exclusion on rodent communities and the seroprevalence of hantaviruses within the Reserva Natural del Bosque Mbaracayú (RNBM), which is a protected area of the Interior Atlantic Forest (IAF). In the IAF, two sympatric rodent reservoirs, Akodon montensis and Oligoryzomys nigripes, harbor Jaborá and Juquitiba hantavirus (JABV, JUQV), respectively. In this study, we employed two complementary methods for predator exclusion: comprehensive fencing and trapping/removal. The goal of exclusion was to preclude the influence of predation on small mammals on the sampling grids and thereby potentially reduce rodent mortality. Following baseline sampling on three grid pairs with different habitats, we closed the grids and began predator removal. By sampling three habitat types, we controlled for habitat-specific effects, which is important for hantavirus-reservoir dynamics in neotropical ecosystems. Our six-month predator exclusion experiment revealed that the exclusion of terrestrial mammalian predators had little influence on the rodent community or the population dynamics of A. montensis and O. nigripes. Instead, fluctuations in species diversity and species abundances were influenced by sampling session and forest degradation. These results suggest that seasonality and landscape composition play dominant roles in the prevalence of hantaviruses in rodent reservoirs in the IAF ecosystem.
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Affiliation(s)
- Briana Spruill-Harrell
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - Anna Pérez-Umphrey
- School of Renewable Natural Resources, Louisiana State University and AgCenter, 227 RNR Building, Baton Rouge, LA 70803, USA;
| | | | - Xueyuan Cao
- Department of Nursing-Acute/Tert Care, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - Robert D. Owen
- Centro para el Desarrollo de la Investigación Científica, Asunción C.P. 1371, Paraguay;
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Colleen B. Jonsson
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
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Camp JV, Spruill-Harrell B, Owen RD, Solà-Riera C, Williams EP, Eastwood G, Sawyer AM, Jonsson CB. Mixed Effects of Habitat Degradation and Resources on Hantaviruses in Sympatric Wild Rodent Reservoirs within a Neotropical Forest. Viruses 2021; 13:85. [PMID: 33435494 PMCID: PMC7827808 DOI: 10.3390/v13010085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 01/06/2021] [Accepted: 01/06/2021] [Indexed: 12/23/2022] Open
Abstract
Understanding the ecology of rodent-borne hantaviruses is critical to assessing the risk of spillover to humans. Longitudinal surveys have suggested that hantaviral prevalence in a given host population is tightly linked to rodent ecology and correlates with changes in the species composition of a rodent community over time and/or habitat composition. We tested two hypotheses to identify whether resource addition and/or habitat composition may affect hantavirus prevalence among two sympatric reservoir hosts in a neotropical forest: (i) increased food resources will alter the rodent community and thus hantaviral prevalence; and (ii) host abundance and viral seroprevalence will be associated with habitat composition. We established a baseline of rodent-virus prevalence in three grid pairs of distinct habitat compositions and subjected one grid of each pair to resource augmentation. Increased rodent species diversity was observed on grids where food was added versus untreated control grids during the first post-treatment sampling session. Resource augmentation changed species community composition, yet it did not affect the prevalence of hantavirus in the host population over time, nor was there evidence of a dilution effect. Secondly, we show that the prevalence of the virus in the respective reservoir hosts was associated with habitat composition at two spatial levels, independent of resource addition, supporting previous findings that habitat composition is a primary driver of the prevalence of hantaviruses in the neotropics.
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Affiliation(s)
- Jeremy V. Camp
- Institute of Virology, University of Veterinary Medicine Vienna, 1210 Vienna, Austria;
| | - Briana Spruill-Harrell
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (B.S.-H.); (E.P.W.)
| | - Robert D. Owen
- Centro para el Desarrollo de la Investigación Científica, Asunción C.P. 1371, Paraguay;
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Carles Solà-Riera
- Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital, 141 86 Stockholm, Sweden;
| | - Evan P. Williams
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (B.S.-H.); (E.P.W.)
| | - Gillian Eastwood
- Department of Microbiology, University of Tennessee-Knoxville, Knoxville, TN 37996, USA; (G.E.); (A.M.S.)
| | - Aubrey M. Sawyer
- Department of Microbiology, University of Tennessee-Knoxville, Knoxville, TN 37996, USA; (G.E.); (A.M.S.)
| | - Colleen B. Jonsson
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (B.S.-H.); (E.P.W.)
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Ferro I, Bellomo CM, López W, Coelho R, Alonso D, Bruno A, Córdoba FE, Martinez VP. Hantavirus pulmonary syndrome outbreaks associated with climate variability in Northwestern Argentina, 1997-2017. PLoS Negl Trop Dis 2020; 14:e0008786. [PMID: 33253144 PMCID: PMC7728390 DOI: 10.1371/journal.pntd.0008786] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 12/10/2020] [Accepted: 09/09/2020] [Indexed: 01/10/2023] Open
Abstract
Background Rodent-borne hantaviruses (genus Orthohantavirus) are the etiologic agents causing two human diseases: hemorrhagic fever with renal syndrome (HFRS) in Euroasia; and hantavirus pulmonary syndrome (HPS) in North and South America. In South America fatality rates of HPS can reach up to 35%–50%. The transmission of pathogenic hantaviruses to humans occurs mainly via inhalation of aerosolized excreta from infected rodents. Thus, the epidemiology of HPS is necessarily linked to the ecology of their rodent hosts and the contact with a human, which in turn may be influenced by climatic variability. Here we examined the relationship between climatic variables and hantavirus transmission aim to develop an early warning system of potential hantavirus outbreaks based on ecologically relevant climatic factors. Methodology and main findings We compiled reported HPS cases in northwestern Argentina during the 1997–2017 period and divided our data into biannual, quarterly, and bimestrial time periods to allow annual and shorter time delays to be observed. To evaluate the relationship of hantavirus transmission with mean temperature and precipitation we used dynamic regression analysis. We found a significant association between HPS incidence and lagged rainfall and temperature with a delay of 2 to 6 months. For the biannual and quarterly models, hantavirus transmission was positively associated with lagged rainfall and temperature; whereas the bimestrial models indicate a direct relationship with the rainfall but inverse for temperature in the second lagged period. Conclusions/Significance This work demonstrates that climate variability plays a significant role in the transmission of hantavirus in northwestern Argentina. The model developed in this study provides a basis for the forecast of potential HPS outbreaks based on climatic parameters. Our findings are valuable for the development of public health policies and prevention strategies to mitigate possible outbreaks. Nonetheless, a surveillance program on rodent population dynamics would lead to a more accurate forecast of HPS outbreaks. Hantavirus pulmonary syndrome (HPS) is a Pan-American emerging disease with a high mortality rate caused by a rodent-borne virus. In Argentina, almost half of the HPS infections occur in the northwestern endemic region. Most of the reported cases (75%) developed severe respiratory insufficiency, of which 30% required mechanical ventilation and 15% with a fatal outcome. In this study area, nearly half of the population is below the poverty line, particularly in rural areas, where most infections occur. Since there are no vaccines currently available nor specific therapeutic treatments, prevention of hantavirus infection involves mainly environmental management practices and educational campaigns. Our results provide a framework for the planning and implementation of early public health prevention campaigns based on the significant relationship between hantavirus outbreaks and delayed climatic variables.
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Affiliation(s)
- Ignacio Ferro
- Instituto de Ecorregiones Andinas—Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)—Universidad Nacional de Jujuy (UNJu), San Salvador de Jujuy, Argentina
- * E-mail:
| | - Carla M. Bellomo
- Instituto Nacional de Enfermedades Infecciosas (INEI), Administración Nacional de Laboratorios e Institutos de Salud (ANLIS) “Dr. C. G. Malbrán”, Buenos Aires, Argentina
| | - Walter López
- Instituto de Investigaciones de Enfermedades Tropicales, Oran, Salta, Argentina
| | - Rocío Coelho
- Instituto Nacional de Enfermedades Infecciosas (INEI), Administración Nacional de Laboratorios e Institutos de Salud (ANLIS) “Dr. C. G. Malbrán”, Buenos Aires, Argentina
| | - Daniel Alonso
- Instituto Nacional de Enfermedades Infecciosas (INEI), Administración Nacional de Laboratorios e Institutos de Salud (ANLIS) “Dr. C. G. Malbrán”, Buenos Aires, Argentina
| | | | - Francisco E. Córdoba
- Instituto de Ecorregiones Andinas—Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)—Universidad Nacional de Jujuy (UNJu), San Salvador de Jujuy, Argentina
| | - Valeria P. Martinez
- Instituto Nacional de Enfermedades Infecciosas (INEI), Administración Nacional de Laboratorios e Institutos de Salud (ANLIS) “Dr. C. G. Malbrán”, Buenos Aires, Argentina
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Juan E, Levis S, Pini N, Polop J, Steinmann AR, Provensal MC. Mechanisms of Hantavirus Transmission in Oligoryzomys longicaudatus. ECOHEALTH 2019; 16:671-681. [PMID: 31792647 DOI: 10.1007/s10393-019-01454-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 08/12/2019] [Accepted: 10/15/2019] [Indexed: 06/10/2023]
Abstract
The cricetid rodent Oligoryzomys longicaudatus is the species host of Andes virus (ANDV) which causes hantavirus pulmonary syndrome in southern Argentina and Chile. Population density, behavioral interactions, and spacing patterns are factors that affect viral transmission among wild rodents. We predict that the highest prevalence of hantavirus antibody positive would be found among wounded, reproductive males and that, at high population densities, wounded, reproductive males would be dispersers rather than resident individuals. The study was conducted seasonally from October (spring) 2011 to October (spring) 2013 in a shrubland habitat of Cholila, Argentina. During each trapping session, we classified captured O. longicaudatus as resident or disperser individuals, estimated population density, and recorded wounds as an indicator of aggression among individuals. We obtained blood samples from each individual for serological testing. We used generalized linear models to test the statistical significance of association between antibody prevalence, and sex, resident/dispersal status, wounds and trapping session. The highest proportion of seropositive O. longicaudatus individuals was among wounded reproductive males during periods of the greatest population density, and the characteristics of seroconverted individuals support that transmission is horizontal through male intrasexual competition. A positive association between dispersing individuals and hantavirus antibody was detected at high population density. Our study design allowed us to obtain data on a large number of individuals that are seroconverted, enabling a better understanding of the ecology and epidemiology of the ANDV host system.
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Affiliation(s)
- Ernesto Juan
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avda. Rivadavia 1917, CP C1033AAJ, Ciudad Autónoma de Buenos Aires, Argentina
| | - Silvana Levis
- Instituto Nacional de Enfermedades Virales Humanas (INEVH), Pergamino, Argentina
| | - Noemí Pini
- Instituto Nacional de Enfermedades Virales Humanas (INEVH), Pergamino, Argentina
| | - Jaime Polop
- Grupo de Investigaciones en Ecología Poblacional y Comportamental (GIEPCO), Departamento de Ciencias Naturales, Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA), Universidad Nacional de Río Cuarto (UNRC)- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Agencia Postal N° 3, 5800, Río Cuarto, Córdoba, Argentina
| | - Andrea R Steinmann
- Grupo de Investigaciones en Ecología Poblacional y Comportamental (GIEPCO), Departamento de Ciencias Naturales, Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA), Universidad Nacional de Río Cuarto (UNRC)- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Agencia Postal N° 3, 5800, Río Cuarto, Córdoba, Argentina
| | - María Cecilia Provensal
- Grupo de Investigaciones en Ecología Poblacional y Comportamental (GIEPCO), Departamento de Ciencias Naturales, Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA), Universidad Nacional de Río Cuarto (UNRC)- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Agencia Postal N° 3, 5800, Río Cuarto, Córdoba, Argentina.
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Ortiz N, Juan EE, Chiappero MB, Gardenal CN, Provensal MC, Polop JJ, González-Ittig RE. Microgeographic genetic structure of Oligoryzomys longicaudatus (Rodentia, Cricetidae) in periods of different population density. J Mammal 2019. [DOI: 10.1093/jmammal/gyz152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AbstractThe long-tailed pygmy rice rat Oligoryzomys longicaudatus (Rodentia, Cricetidae) experiences marked population density fluctuations. This species is the major reservoir of the Andes orthohantavirus associated with the hantavirus pulmonary syndrome in southern Argentina, and information on dispersal patterns at different population densities, or differences in dispersal between the sexes during those periods, could contribute to understanding risk of viral transmission among individuals. We examined the spatial genetic structure of O. longicaudatus at a local scale to elucidate how variation in population density influences dispersal patterns. Effective dispersal levels were estimated through spatial genetic autocorrelation (SGA) analyses in periods of different density, and for females and males separately, within an area of 510 × 180 m, using seven microsatellite loci. In autumn (high-intermediate and intermediate densities), SGA was primarily determined by females, which show philopatric behavior in defense of their nests and newborns. In summer (low density), neither sex showed SGA, which could be due to spacing behavior combined with high recruitment rates among adjacent environments. At high-intermediate densities, females remained close to each other, contracting their home ranges. These established individuals would “fence” the area, preventing the immigration of individuals from proximate areas, until population density declines again. We detected differential patterns of effective dispersal for both sexes in different stages of the annual and inter-annual population phases of O. longicaudatus. Since high levels of gene flow were reported for both sexes in summer and for males in all analyzed seasons, the transmission risk of diseases such as hantavirus pulmonary syndrome would be high at a local scale.La densidad poblacional del ratón “colilargo” Oligoryzomys longicaudatus (Rodentia, Cricetidae) experimenta marcadas fluctuaciones. Esta especie es el principal reservorio del ortohantavirus Andes, asociado con el síndrome pulmonar por hantavirus en el sur de Argentina. El conocimiento sobre los patrones de dispersión a diferentes densidades poblacionales y entre los sexos durante esos períodos, podría contribuir a evaluar el riesgo de transmisión viral entre individuos. Examinamos la estructura genética espacial de O. longicaudatus a escala local para determinar de qué manera las variaciones en la densidad poblacional influyen sobre los patrones de dispersión del roedor. Los niveles de dispersión efectiva se estimaron mediante análisis de autocorrelación genética espacial (AGE) utilizando siete loci de microsatélites, dentro de un área de 510 × 180 m. Los análisis se hicieron en distintos períodos de densidad para la población general y para hembras y machos por separado. En otoño (densidad alta-intermedia e intermedia), la AGE estuvo determinada principalmente por las hembras, lo que podría explicarse por su comportamiento filopátrico en relación a la defensa de sus nidos y crías. En verano (baja densidad), ninguno de los sexos mostró AGE, debido a un comportamiento de espaciamiento combinado con altas tasas de reclutamiento entre ambientes adyacentes con diferentes recursos. A densidades altas-intermedias, las hembras permanecieron cerca una de la otra, contrayendo su área de acción. Estos individuos cercarían el área, evitando la inmigración de individuos de áreas cercanas, hasta que la densidad poblacional disminuya nuevamente. Detectamos patrones diferenciales de dispersión efectiva para ambos sexos en cada una de las fases de densidad poblacional (anual e interanual) de O. longicaudatus. El riesgo de transmisión del síndrome pulmonar por hantavirus sería elevado a escala local, dado que se detectaron altos niveles de flujo génico para ambos sexos en verano y para los machos en todas las estaciones analizadas.
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Affiliation(s)
- Natalia Ortiz
- Instituto de Diversidad y Ecología Animal (IDEA), CONICET and Universidad Nacional de Córdoba, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
- Cátedra de Genética de Poblaciones y Evolución, Facultad de Ciencias Exactas, Físicas y Naturales, UNC, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
| | - Ernesto E Juan
- Departamento de Ciencias Naturales, Universidad Nacional de Río Cuarto, Agencia Postal No. 3, 5800 Río Cuarto, Córdoba, Argentina
| | - Marina B Chiappero
- Instituto de Diversidad y Ecología Animal (IDEA), CONICET and Universidad Nacional de Córdoba, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
- Cátedra de Genética de Poblaciones y Evolución, Facultad de Ciencias Exactas, Físicas y Naturales, UNC, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
| | - Cristina N Gardenal
- Instituto de Diversidad y Ecología Animal (IDEA), CONICET and Universidad Nacional de Córdoba, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
- Cátedra de Genética de Poblaciones y Evolución, Facultad de Ciencias Exactas, Físicas y Naturales, UNC, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
| | - María C Provensal
- Departamento de Ciencias Naturales, Universidad Nacional de Río Cuarto, Agencia Postal No. 3, 5800 Río Cuarto, Córdoba, Argentina
| | - Jaime J Polop
- Departamento de Ciencias Naturales, Universidad Nacional de Río Cuarto, Agencia Postal No. 3, 5800 Río Cuarto, Córdoba, Argentina
| | - Raúl E González-Ittig
- Instituto de Diversidad y Ecología Animal (IDEA), CONICET and Universidad Nacional de Córdoba, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
- Cátedra de Genética de Poblaciones y Evolución, Facultad de Ciencias Exactas, Físicas y Naturales, UNC, Av. Vélez Sársfield 299, CP 5000, Córdoba, Argentina
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Marines-Macías T, Colunga-Salas P, Verde Arregoitia LD, Naranjo EJ, León-Paniagua L. Space use by two arboreal rodent species in a Neotropical cloud forest. J NAT HIST 2018. [DOI: 10.1080/00222933.2018.1459921] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Tania Marines-Macías
- Museo de Zoología “Alfonso L. Herrera”, Facultad de Ciencias, Universidad Nacional Autónoma de México, Coyoacán, Mexico
| | - Pablo Colunga-Salas
- Museo de Zoología “Alfonso L. Herrera”, Facultad de Ciencias, Universidad Nacional Autónoma de México, Coyoacán, Mexico
| | - Luis D. Verde Arregoitia
- Museo de Zoología “Alfonso L. Herrera”, Facultad de Ciencias, Universidad Nacional Autónoma de México, Coyoacán, Mexico
- Naturhistorisches Museum Bern, Wirbeltiere, Bern, Switzerland
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Eduardo J. Naranjo
- Departamento de Conservación de la Biodiversidad, El Colegio de la Frontera Sur, San Cristóbal de Las Casas, Mexico
| | - Livia León-Paniagua
- Museo de Zoología “Alfonso L. Herrera”, Facultad de Ciencias, Universidad Nacional Autónoma de México, Coyoacán, Mexico
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Juan EE, Provensal MC, Steinmann AR. Space Use and Social Mating System of the Hantavirus Host, Oligoryzomys longicaudatus. ECOHEALTH 2018; 15:96-108. [PMID: 29196828 DOI: 10.1007/s10393-017-1301-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 08/07/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
The long-tailed mouse, Oligoryzomys longicaudatus (Cricetidae: Sigmodontinae), is the major host of Andes hantavirus, the etiological agent of hantavirus pulmonary syndrome in the south of Argentina and Chile. Studying the ecology of this species is necessary to understand how Andes hantavirus is maintained in nature. In this study, we examine the home range size and intra- and intersexual overlap degree of male and female O. longicaudatus in order to elucidate the mating system of this species. To our knowledge, this research provides the first documentation, obtained from a specific design, of spacing and mating systems in this species in Argentina. The study was conducted seasonally from April (autumn) 2012 to October (spring) 2013 in a shrubland habitat of Cholila, Andean region, Argentina. We studied spacing patterns using 59 and 51 home ranges established by adult males and females, respectively, in two 3.24 ha capture-marked and recapture grids. Significant differences between sexes in home range size and overlap degree were found. Male home ranges were always larger than those of females. We observed exclusive space use both among males and females (13.15 ± 18.67, and 3.60 ± 3.43%, respectively). Considering only those males that get access to receptive females (40%), average intersexual overlap value was about 30.82 ± 19.73%. Sexual differences in home range sizes and the spatial avoidance between breeding males, that would reflect intrasexual competition for receptive females, allows us to propose a polygynous mating system for O. longicaudatus.
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Affiliation(s)
- Ernesto E Juan
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avda. Rivadavia 1917, CP C1033AAJ, Ciudad Autónoma de Buenos Aires, Argentina
| | - Maria Cecilia Provensal
- Departamento de Ciencias Naturales, Universidad Nacional de Río Cuarto, Agencia Postal N° 3, 5800, Río Cuarto, Córdoba, Argentina
| | - Andrea R Steinmann
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avda. Rivadavia 1917, CP C1033AAJ, Ciudad Autónoma de Buenos Aires, Argentina.
- Departamento de Ciencias Naturales, Universidad Nacional de Río Cuarto, Agencia Postal N° 3, 5800, Río Cuarto, Córdoba, Argentina.
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Polop F, Levis S, Pini N, Enría D, Polop J, Provensal MC. Factors associated with hantavirus infection in a wild host rodent from Cholila, Chubut Province, Argentina. Mamm Biol 2018. [DOI: 10.1016/j.mambio.2017.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lazo-Cancino D, Musleh SS, Hernandez CE, Palma E, Rodriguez-Serrano E. Does silvoagropecuary landscape fragmentation affect the genetic diversity of the sigmodontine rodent Oligoryzomys longicaudatus? PeerJ 2017; 5:e3842. [PMID: 28975057 PMCID: PMC5624292 DOI: 10.7717/peerj.3842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 09/01/2017] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Fragmentation of native forests is a highly visible result of human land-use throughout the world. In this study, we evaluated the effects of landscape fragmentation and matrix features on the genetic diversity and structure of Oligoryzomys longicaudatus, the natural reservoir of Hantavirus in southern South America. We focused our work in the Valdivian Rainforest where human activities have produced strong change of natural habitats, with an important number of human cases of Hantavirus. METHODS We sampled specimens of O. longicaudatus from five native forest patches surrounded by silvoagropecuary matrix from Panguipulli, Los Rios Region, Chile. Using the hypervariable domain I (mtDNA), we characterized the genetic diversity and evaluated the effect of fragmentation and landscape matrix on the genetic structure of O. longicaudatus. For the latter, we used three approaches: (i) Isolation by Distance (IBD) as null model, (ii) Least-cost Path (LCP) where genetic distances between patch pairs increase with cost-weighted distances, and (iii) Isolation by Resistance (IBR) where the resistance distance is the average number of steps that is needed to commute between the patches during a random walk. RESULTS We found low values of nucleotide diversity (π) for the five patches surveyed, ranging from 0.012 to 0.015, revealing that the 73 sampled specimens of this study belong to two populations but with low values of genetic distance (γST ) ranging from 0.022 to 0.099. Likewise, we found that there are no significant associations between genetic distance and geographic distance for IBD and IBR. However, we found for the LCP approach, a significant positive relationship (r = 0.737, p = 0.05), with shortest least-cost paths traced through native forest and arborescent shrublands. DISCUSSION In this work we found that, at this reduced geographical scale, Oligoryzomys longicaudatus shows genetic signs of fragmentation. In addition, we found that connectivity between full growth native forest remnants is mediated by the presence of dense shrublands and native forest corridors. In this sense, our results are important because they show how native forest patches and associated routes act as source of vector species in silvoagropecuary landscape, increasing the infection risk on human population. This study is the first approach to understand the epidemiological spatial context of silvoagropecuary risk of Hantavirus emergence. Further studies are needed to elucidate the effects of landscape fragmentation in order to generate new predictive models based on vector intrinsic attributes and landscape features.
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Affiliation(s)
| | - Selim S. Musleh
- Departamento de Oceanografía, Universidad de Concepción, Concepción, Biobío, Chile
| | | | - Eduardo Palma
- Departamento de Ecología, Pontificia Universidad Católica de Chile, Santiago, Chile
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González‐Ittig RE, Polop FJ, Andreo VC, Chiappero MB, Levis S, Calderón G, Provensal MC, Polop JJ, Gardenal CN. Temporal fine‐scale genetic variation in the zoonosis‐carrying long‐tailed pygmy rice rat in
P
atagonia,
A
rgentina. J Zool (1987) 2015. [DOI: 10.1111/jzo.12238] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- R. E. González‐Ittig
- Instituto de Diversidad y Ecología Animal CONICET‐Facultad de Ciencias Exactas Físicas y Naturales Universidad Nacional de Córdoba Córdoba Argentina
| | - F. J. Polop
- Departamento de Ciencias Naturales Universidad Nacional de Río Cuarto Córdoba Argentina
| | - V. C. Andreo
- Departamento de Ciencias Naturales Universidad Nacional de Río Cuarto Córdoba Argentina
| | - M. B. Chiappero
- Instituto de Diversidad y Ecología Animal CONICET‐Facultad de Ciencias Exactas Físicas y Naturales Universidad Nacional de Córdoba Córdoba Argentina
| | - S. Levis
- Instituto Nacional de Enfermedades Virales Humanas (INEVH) ‘Dr. J. Maiztegui’ Pergamino Argentina
| | - G. Calderón
- Instituto Nacional de Enfermedades Virales Humanas (INEVH) ‘Dr. J. Maiztegui’ Pergamino Argentina
| | - M. C. Provensal
- Departamento de Ciencias Naturales Universidad Nacional de Río Cuarto Córdoba Argentina
| | - J. J. Polop
- Departamento de Ciencias Naturales Universidad Nacional de Río Cuarto Córdoba Argentina
| | - C. N. Gardenal
- Instituto de Diversidad y Ecología Animal CONICET‐Facultad de Ciencias Exactas Físicas y Naturales Universidad Nacional de Córdoba Córdoba Argentina
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Polop F, Juan E, Polop J, Provensal MC. Spatial and temporal variation of terrestrial rodent assemblages in Cholila, Chubut Province, Argentina. STUDIES ON NEOTROPICAL FAUNA AND ENVIRONMENT 2014. [DOI: 10.1080/01650521.2014.947075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Estimating hantavirus risk in southern Argentina: a GIS-based approach combining human cases and host distribution. Viruses 2014; 6:201-22. [PMID: 24424500 PMCID: PMC3917439 DOI: 10.3390/v6010201] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 12/17/2013] [Accepted: 12/18/2013] [Indexed: 12/26/2022] Open
Abstract
We use a Species Distribution Modeling (SDM) approach along with Geographic Information Systems (GIS) techniques to examine the potential distribution of hantavirus pulmonary syndrome (HPS) caused by Andes virus (ANDV) in southern Argentina and, more precisely, define and estimate the area with the highest infection probability for humans, through the combination with the distribution map for the competent rodent host (Oligoryzomys longicaudatus). Sites with confirmed cases of HPS in the period 1995–2009 were mostly concentrated in a narrow strip (~90 km × 900 km) along the Andes range from northern Neuquén to central Chubut province. This area is characterized by high mean annual precipitation (~1,000 mm on average), but dry summers (less than 100 mm), very low percentages of bare soil (~10% on average) and low temperatures in the coldest month (minimum average temperature −1.5 °C), as compared to the HPS-free areas, features that coincide with sub-Antarctic forests and shrublands (especially those dominated by the invasive plant Rosa rubiginosa), where rodent host abundances and ANDV prevalences are known to be the highest. Through the combination of predictive distribution maps of the reservoir host and disease cases, we found that the area with the highest probability for HPS to occur overlaps only 28% with the most suitable habitat for O. longicaudatus. With this approach, we made a step forward in the understanding of the risk factors that need to be considered in the forecasting and mapping of risk at the regional/national scale. We propose the implementation and use of thematic maps, such as the one built here, as a basic tool allowing public health authorities to focus surveillance efforts and normally scarce resources for prevention and control actions in vast areas like southern Argentina.
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