Nuevo desafío en Salud Pública: Presencia de reservorios de Hanta,  Oligoryzomys longicaudatus y Rattus spp., en aéreas de borde en praderas del sur de Chile.

Murúa, Roberto; Barrera, Karen

doi:10.7770/safer-v3n3-art966

Cited by 3 publications

(2 citation statements)

References 19 publications

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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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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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“…At last, the Patagonia province presents a reduction of the height of the trees of the genus Nothofagus, scattered and low shrubs and a rainy and cold weather (Villagrán and Hinojosa, 2005). In addition, the Long-tailed pygmy rice rat presents high abundances in its habitat, so its capture tends to be very frequent (Barrera and Murua, 2015). Their breeding takes place from October to December, sexual maturity of the young is reached within about a month, there are no evidence of sexual dimorphism and their lifespan is estimated at one year.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the influence of biotic and abiotic factors on the prevalence and abundance of infestations of Mysolaelaps microspinosus (Fonseca, 1936) (Mesostigmata: Laelapidae) on Oligoryzomys longicaudatus (Bennett, 1832) in Chile

et al. 2023

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The diverse biogeography of Chile provides it an ideal field to study the influence of environmental factors on plant and animal biodiversity. Some small animal species are distributed throughout dissimilar environmental zones, such as the biogeographic provinces, Mediterranean, Temperate Forest and Patagonia. One of these species is Oligoryzomys longicaudatus (Long-tailed pygmy rice rat), which is parasitized by mites of the genus Mysolaelaps (Fonseca, 1936). In this context, the present study describes the parasitic infestation rates of Mysolaelaps microspinosus on O. longicaudatus and evaluates its relationship with biotic factors (sex and host body mass) and abiotic factors (biogeographical province and season). Of 328 O. longicaudatus analyzed, 68 Mysolaelaps positive cases were obtained. Prevalence and mean abundance were 20.7% and 0.708, respectively. Multifactorial logistic and negative binomial regressions were performed to evaluate the effect of biotic and abiotic factors on prevalence and mean abundance. Both rates were significantly and directly related with biogeographic province and season, with higher rates in Mediterranean and Temperate Forest provinces and in winter and spring. The mean abundance had a significant direct relationship with host body mass, describing higher rates on heavier individuals. These results suggest that environmental factors such as temperature and food availability, strongly affect the ecology of M. microspinosus. Here we proposed that the southern limit for the genus in Chile is 47°S, mainly, due to colder temperatures. Also, biotic factors such as the weight of unpregnant hosts are relevant in parasite infestations, due to a greater parasitic load capacity by heavier individuals.

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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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Nuevo desafío en Salud Pública: Presencia de reservorios de Hanta, Oligoryzomys longicaudatus y Rattus spp., en aéreas de borde en praderas del sur de Chile.

Cited by 3 publications

References 19 publications

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

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

Evaluation of the influence of biotic and abiotic factors on the prevalence and abundance of infestations of Mysolaelaps microspinosus (Fonseca, 1936) (Mesostigmata: Laelapidae) on Oligoryzomys longicaudatus (Bennett, 1832) in Chile

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

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