Influence of patch and landscape characteristics on the distribution of the subterranean rodent Ctenomys porteousi

Mapelli, Fernando J.; Kittlein, Marcelo J.

doi:10.1007/s10980-009-9352-x

Cited by 35 publications

(47 citation statements)

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“…In each locality, all individuals were captured in a period of 3-4 days. All sample localities consisted of a discrete habitat patch located in areas with sandy and friable soils with little plant cover (for a better description of the habitat see Mapelli and Kittlein 2009). …”

Section: Sample Collection Dna Extraction and Microsatellite Amplifimentioning

confidence: 99%

“…The suitable habitat of C. porteousi was estimated in only 509 km 2 , which represents less than 10% of its geographical range (Mapelli and Kittlein 2009). The habitat of this species is naturally fragmented, but in recent years the degree of fragmentation has notably increased because of the extraordinary expansion of soybean cultivation in the region.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, these rodents show high habitat restrictions associated to plant cover (Mapelli and Kittlein 2009). These habitat restrictions determine, in general, discontinued distributions (El Jundi and Freitas 2004;Mora et al 2006Mora et al , 2007.…”

Section: Introductionmentioning

confidence: 99%

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Population structure and landscape genetics in the endangered subterranean rodent Ctenomys porteousi

et al. 2011

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In order to devise adequate conservation and management strategies for endangered species, it is important to incorporate a reliable understanding of its spatial population structure, detecting the existence of demographic partitions throughout its geographical range and characterizing the distribution of its genetic diversity. Moreover, in species that occupy fragmented habitats it is essential to know how landscape characteristics may affect the genetic connectivity among populations. In this study we use eight microsatellite markers to analyze population structure and gene flow patterns in the complete geographic range of the endangered rodent Ctenomys porteousi. Also, we use landscape genetics approaches to evaluate the effects of landscape configuration on the genetic connectivity among populations. In spite of geographical proximity of the sampling sites (8-27 km between the nearest sites) and the absence of marked barriers to individual movement, strong population structure and low values of gene flow were observed. Genetic differentiation among sampling sites was consistent with a simple model of isolation by distance, where peripheral areas showed higher population differentiation than those sites located in the central area of the species' distribution. Landscape genetics analysis suggested that habitat fragmentation at regional level has affected the distribution of genetic variation among populations. The distance of sampling sites to areas of the landscape having higher habitat connectivity was the environmental factor most strongly related to population genetic structure. In general, our results indicate strong genetic structure in C. porteousi, even at a small spatial scale, and suggest that habitat fragmentation could increase the population differentiation.

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Section: Sample Collection Dna Extraction and Microsatellite Amplifimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Population structure and landscape genetics in the endangered subterranean rodent Ctenomys porteousi

et al. 2011

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“…Both results are expected given that vegetation cover favors soil development, and enlargement of 334 the root system increases soil compactness, where burrowing becomes energetically more expensive 335 (Mapelli & Kittlein 2009). The fact that we found Ndvi as a factor in the model explaining genetic 336 structure only at the metapopulation level, probably indicates its influence not only on habitat patches 337 but also on their surrounding areas.…”

Section: Niche Stability 256mentioning

confidence: 92%

Influence of environmental heterogeneity on the distribution and persistence of a subterranean rodent in a highly unstable landscape

et al. 2016

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“…Differential responses to fragmentation may be caused by behavioral differences that determine space use and movement patterns of the organisms (Ims 1995). Characteristics such as site fidelity, dispersal ability, colonization capacity, and habitat specialization also influence the vulnerability of species to habitat fragmentation (Ewers and Didham 2006, Mapelli and Kittlein 2009, Dennis et al 2012). …”

Section: Introductionmentioning

confidence: 99%

Assessing the use of forest islands by parrot species in a neotropical savanna

Berkunsky¹,

Simoy²,

Cepeda³

et al. 2015

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ABSTRACT. Understanding the effect of habitat fragmentation is a fundamental yet complicated aim of many ecological studies. Beni savanna is a naturally fragmented forest habitat, where forest islands exhibit variation in resources and threats. To understand how the availability of resources and threats affect the use of forest islands by parrots, we applied occupancy modeling to quantify use and detection probabilities for 12 parrot species on 60 forest islands. The presence of urucuri (Attalea phalerata) and macaw (Acrocomia aculeata) palms, the number of tree cavities on the islands, and the presence of selective logging,and fire were included as covariates associated with availability of resources and threats. The model-selection analysis indicated that both resources and threats variables explained the use of forest islands by parrots. For most species, the best models confirmed predictions. The number of cavities was positively associated with use of forest islands by 11 species. The area of the island and the presence of macaw palm showed a positive association with the probability of use by seven and five species, respectively, while selective logging and fire showed a negative association with five and six species, respectively. The Blue-throated Macaw (Ara glaucogularis), the critically endangered parrot species endemic to our study area, was the only species that showed a negative association with both threats. Monitoring continues to be essential to evaluate conservation and management actions of parrot populations. Understanding of how species are using this natural fragmented habitat will help determine which fragments should be preserved and which conservation actions are needed. Évaluation de l'utilisation d'îles forestières par des espèces de perroquets dans une savane néotropicaleRÉSUMÉ. La compréhension de l'effet de la fragmentation de l'habitat est l'objectif fondamental mais compliqué de nombreuses recherches en écologie. La savane de Beni est un milieu forestier naturellement fragmenté dans lequel les îles forestières diffèrent sur le plan des ressources et des menaces. Afin de comprendre à quel point la disponibilité des ressources et les menaces ont une influence sur l'utilisation d'îles forestières par les perroquets, nous avons appliqué des modèles de présence pour quantifier l'utilisation et la probabilité de détection de 12 espèces de perroquets sur 60 îles forestières. La présence de palmiers canne (Acrocomia aculeata) et de palmiers urucuri (Attalea phalerata), le nombre de cavités d'arbres sur les îles et la présence de coupes sélectives et de feu ont été inclus comme covariables associées à la disponibilité des ressources et aux menaces. L'analyse de la sélection de modèles a indiqué que les variables relatives aux ressources et celles relatives aux menaces expliquaient l'utilisation d'îles forestières par les perroquets. Pour la plupart des espèces de perroquets, les meilleurs modèles ont confirmé les prédictions. Le nombre de cavités était positivement associé avec l'utilisatio...

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Influence of patch and landscape characteristics on the distribution of the subterranean rodent Ctenomys porteousi

Cited by 35 publications

References 47 publications

Population structure and landscape genetics in the endangered subterranean rodent Ctenomys porteousi

Population structure and landscape genetics in the endangered subterranean rodent Ctenomys porteousi

Influence of environmental heterogeneity on the distribution and persistence of a subterranean rodent in a highly unstable landscape

Assessing the use of forest islands by parrot species in a neotropical savanna

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