Summer—autumn distribution and abundance of the hantavirus host,<i>Oligoryzomys longicaudatus</i>, in northwestern Chubut, Argentina

Andreo, Verónica; Provensal, Cecilia; Levis, Silvana; Pini, Noemí; Enría, Delia; Polop, Jaime

doi:10.1644/11-mamm-a-201.1

Cited by 19 publications

(21 citation statements)

References 32 publications

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“…This result suggests that these temporal populations may be formed by individuals from different geographic origins. Murúa et al (1986), Polop et al (2010), Polop (2011) and Andreo et al (2012), based on the very low levels of recapture, the high proportion of transient individuals throughout the year and the continuous recruitments (number of new animals added to the trappable population either born in situ or migrants from surrounding areas) concluded that individuals of O. longicaudatus are highly vagile, which is in line with our present results. After summer 2008, the frequency of cluster 2 and the levels of relatedness increased.…”

Section: Discussionsupporting

confidence: 90%

“…(), Polop () and Andreo et al . (), based on the very low levels of recapture, the high proportion of transient individuals throughout the year and the continuous recruitments (number of new animals added to the trappable population either born in situ or migrants from surrounding areas) concluded that individuals of O. longicaudatus are highly vagile, which is in line with our present results.…”

Section: Discussionmentioning

confidence: 99%

“…The dominant species of shrublands include native species such as ‘calafate’ Berberis microphylla , ‘romerillo’ Senecio filaginoides , ‘espino negro’ Discaria articulata and the exotic species ‘rosa mosqueta’ Rosa rubiginosa . This last species has been found to release numerous seeds and offer protection favoring the presence of hantavirus‐infected rodents (Andreo et al ., ). Fragmented remains of forest are composed of species such as ‘ñire’ Nothofagus antarctica , ‘lenga’ N. pumilio , ‘coihue’ N. dombeyi , ‘maitén’ Maytenus boaria , ‘arrayán’ Luma apiculata and the conifer ‘ciprés de la cordillera’ Austrocedrus chilensis in lower numbers, with patches of ‘caña coligüe’ C. culeou in the understory.…”

Section: Methodsmentioning

confidence: 99%

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Temporal fine‐scale genetic variation in the zoonosis‐carrying long‐tailed pygmy rice rat in Patagonia, Argentina

et al. 2015

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Factors modeling the population genetic structure are of major importance when species involved in the transmission of zoonoses are considered. The long‐tailed pygmy rice rat or ‘colilargo’ Oligoryzomys longicaudatus is a highly vagile rodent species which acts as the reservoir of the Andes hantavirus in southern Argentina and Chile. To contribute to the knowledge of the processes determining the microgeographical genetic structure of populations of this species, we used 10 microsatellite loci to estimate the levels of polymorphism, individual relatedness and the population effective sizes through time and to explore if the effective size correlated with density. Individuals were sampled seasonally during a 25‐month period in a population from the Argentinean Patagonia located in the endemic area of Hantavirus Pulmonary Syndrome. We detected three genetic clusters. An important temporal change in cluster prevalence was detected after a population bottleneck. Individuals of the same period presented higher mean relatedness values than between consecutive periods. Density and effective population size estimations were correlated. All analyses performed in this study are in line with the conclusion that high levels of gene flow encompassing different habitats would be a major process producing fine‐scale temporal changes in the genetic composition of the studied population.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Temporal fine‐scale genetic variation in the zoonosis‐carrying long‐tailed pygmy rice rat in Patagonia, Argentina

et al. 2015

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“…In Valdivia, Chile, Mansilla (2006) found that >50% of HCPS cases were associated to silvoagropecuary landscapes ( Holz & Palma, 2012 ). In addition, the long - tailed pygmy rice rat is one of the most common species in the rodent assemblages, where it could potentially infect other wild rodent species with the ANDV (horizontal transmission to coexisting species; Palma et al, 2012b ), thus increasing the risk to humans ( Polop et al, 2010 ; Andreo et al, 2012 ; Barrera & Murúa, 2016 ). 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, highly associated to human activities increasing the infection risk on human population.…”

Section: Discussionmentioning

confidence: 99%

Does silvoagropecuary landscape fragmentation affect the genetic diversity of the sigmodontine rodentOligoryzomys longicaudatus?

Lazo-Cancino

Musleh

Hernández

et al. 2017

PeerJ

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BackgroundFragmentation 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.MethodsWe 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.ResultsWe 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.DiscussionIn 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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“…In Valdivia, Chile, Mansilla (2006) found that > 50% of HCPS cases were associated to silvoagropecuary landscapes (Holz & Palma, 2012). In addition, the long -tailed pygmy rice rat is one of the most common species in the rodent assemblages, where it could potentially infect other wild rodent species with the ANDV (horizontal transmission to coexisting species; Palma et al 2012b), thus increasing the risk to humans (Polop et al, 2010;Andreo et al, 2012;Barrera & Murúa, 2016 GIS representation and satellite image of the study site.…”

Section: Discussionmentioning

confidence: 99%

Peer Review #3 of "Does silvoagropecuary landscape fragmentation affect the genetic diversity of the sigmodontine rodent Oligoryzomys longicaudatus? (v0.2)"

2017

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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 (γ ST) 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

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Summer—autumn distribution and abundance of the hantavirus host,Oligoryzomys longicaudatus, in northwestern Chubut, Argentina

Cited by 19 publications

References 32 publications

Temporal fine‐scale genetic variation in the zoonosis‐carrying long‐tailed pygmy rice rat in Patagonia, Argentina

Temporal fine‐scale genetic variation in the zoonosis‐carrying long‐tailed pygmy rice rat in Patagonia, Argentina

Does silvoagropecuary landscape fragmentation affect the genetic diversity of the sigmodontine rodentOligoryzomys longicaudatus?

Peer Review #3 of "Does silvoagropecuary landscape fragmentation affect the genetic diversity of the sigmodontine rodent Oligoryzomys longicaudatus? (v0.2)"

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