Geographic distribution of Rhyncholestes raphanurus Osgood, 1924 (Paucituberculata:Caenolestidae), an endemic marsupial of the Valdivian Temperate Rainforest

The Chilean shrew opossum (Rhyncholestes raphanurus) is the southernmost representative of the family Caenolestidae (Marsupialia : Paucituberculata). The species lives in temperate forests of southern Chile and Argentina and is currently known from <25 localities, spanning a latitudinal and longitudinal range of 2°44′ (~320 km) and 2°20′ (~190 km), respectively. Species distribution was analysed in a historical, geographic and biogeographic context, with the use of maps at different scales (region, subregion, province, ecoregion, forest types), and two potential distribution models were generated with MaxEnt. The models show a few isolated areas of high prediction values (>50%) in coastal Chile and the Andes from 39°30′ to ~42°S, and most of Chiloé Island, plus a northern and southern expansion of medium to low (<50%) prediction values. The most important environmental variables identified from the models include precipitation and some temperature-related variables. The species occurrence lies within the Andean region, Subantarctic subregion, and Valdivian biogeographic province. At a smaller scale, most of the localities occur in eight of the 22 forest types described for the Valdivian ecoregion, implying narrow ecological requirements. Identification of critical areas through potential distribution modelling may have implications for species conservation and identification of biogeographic patterns.

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New locality records of Rhagomys longilingua Luna & Patterson, 2003 (Rodentia: Cricetidae) in Peru

Check List ◽

10.15560/13.3.2136 ◽

2017 ◽

Vol 13 (3) ◽

pp. 2136 ◽

Cited By ~ 3

Author(s):

César E. Medina ◽

Darwin R. Díaz ◽

Kateryn Pino ◽

Alexander Pari ◽

Horacio Zeballos

Keyword(s):

South America ◽

Geographic Distribution ◽

National Park ◽

Potential Distribution ◽

Distribution Range ◽

Type Locality ◽

Eastern Slope ◽

Distribution Models ◽

The Andes ◽

Manu National Park

Rhagomys longilingua is one of the rarest sigmodontine rodents of South America, currently known from only 2 localities (4 individuals) in Peru and Bolivia. Here we report 3 additional localities in Peru, one of which extends the geographic distribution range of this species 613 km northeast from the type locality (Suecia, Manu National Park, Cusco department). Potential distribution models showed the presence of R. longilingua from Bolivia until Colombia along the eastern slope of the Andes.

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Magnolia mercedesiarum (subsect. Talauma, Magnoliaceae): a new Andean species from northern Ecuador, with insights into its potential distribution

Phytotaxa ◽

10.11646/phytotaxa.348.4.2 ◽

2018 ◽

Vol 348 (4) ◽

pp. 254 ◽

Cited By ~ 2

Author(s):

J.-ANTONIO VÁZQUEZ-GARCÍA ◽

DAVID A. NEILL ◽

VIACHESLAV SHALISKO ◽

FRANK ARROYO ◽

R. EFRÉN MERINO-SANTI

Keyword(s):

New Species ◽

Species Distribution ◽

Rare Species ◽

Potential Distribution ◽

Species Distribution Models ◽

Distribution Area ◽

Distribution Models ◽

The Andes ◽

Vegetation Sampling ◽

A New Species

Magnolia mercedesiarum, a new species from the eastern slopes of the Andes in northern Ecuador, is described and illustrated, and a key to Ecuadorian Magnolia (subsect. Talauma) is provided. This species differs from M. vargasiana in having broadly elliptic leaves that have an obtuse base vs. suborbicular and subcordate to cordate, glabrous stipular scars, more numerous lateral veins per side and fewer stamens. It also differs from M. llanganatensis in having leaf blades broadly elliptic vs. elliptic, longer petioles, less numerous lateral leaf veins per side, larger fruits and more numerous petals and carpels. Using MaxEnt species distribution models and IUCN threat criteria, M. mercedesiarum has a potential distribution area of less than 3307 km² and is assessed as Endangered (EN): B1 ab (i, ii, iii). The relevance of systematic vegetation sampling in the discovery of rare species is highlighted.

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First genome-wide analysis of an endangered lichen reveals isolation by distance and strong population structure

10.1101/237164 ◽

2017 ◽

Cited By ~ 2

Author(s):

Jessica L. Allen ◽

Sean K. McKenzie ◽

Robin S. Sleith ◽

S. Elizabeth Alter

Keyword(s):

Genetic Diversity ◽

Population Genomics ◽

Isolation By Distance ◽

Geographic Distance ◽

Distribution Models ◽

Extrinsic Factors ◽

Biogeographic Patterns ◽

Ecological Requirements ◽

Genome Wide ◽

Isolation By Environment

AbstractLichenized fungi are evolutionarily diverse and ecologically important, but little is known about the processes driving diversification and genetic differentiation in these lineages. Though few studies have examined population genetic patterns in lichens, their geographic distributions are often assumed to be wholly shaped by ecological requirements rather than dispersal limitations. Furthermore, while their reproductive structures are observable, the lack of information about recombination mechanisms and rates can make inferences about reproductive strategies difficult. Here we investigate the population genomics ofCetradonia linearis, an endangered lichen narrowly endemic to the southern Appalachians of eastern North America, to test the relative contributions of environmental factors and geographic distance in shaping genetic structure, and to gain insights into the demography and reproductive biology of range restricted fungi. Analysis of genome-wide SNP data indicated strong evidence for both low rates of recombination and for strong isolation by distance, but did not support isolation by environment. Hindcast species distribution models and the spatial distribution of genetic diversity also suggested thatC. linearishad a larger range during the last glacial maximum, especially in the southern portion of its current extent, consistent with previous findings in other southern Appalachian taxa. These results contribute to our understanding of intrinsic and extrinsic factors shaping genetic diversity and biogeographic patterns inC. linearis, and more broadly, in rare and endangered fungi.

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Endemic Juniperus Montane Species Facing Extinction Risk under Climate Change in Southwest China: Integrative Approach for Conservation Assessment and Prioritization

Biology ◽

10.3390/biology10010063 ◽

2021 ◽

Vol 10 (1) ◽

pp. 63

Author(s):

Mohammed A. Dakhil ◽

Marwa Waseem A. Halmy ◽

Walaa A. Hassan ◽

Ali El-Keblawy ◽

Kaiwen Pan ◽

...

Keyword(s):

Climate Change ◽

Potential Distribution ◽

Extinction Risk ◽

In Situ Conservation ◽

Integrative Approach ◽

Conservation Assessment ◽

Distribution Models ◽

Area Of Occupancy ◽

Annual Range ◽

The Impact

Climate change is an important driver of biodiversity loss and extinction of endemic montane species. In China, three endemic Juniperus spp. (Juniperuspingii var. pingii, J.tibetica, and J.komarovii) are threatened and subjected to the risk of extinction. This study aimed to predict the potential distribution of these three Juniperus species under climate change and dispersal scenarios, to identify critical drivers explaining their potential distributions, to assess the extinction risk by estimating the loss percentage in their area of occupancy (AOO), and to identify priority areas for their conservation in China. We used ensemble modeling to evaluate the impact of climate change and project AOO. Our results revealed that the projected AOOs followed a similar trend in the three Juniperus species, which predicted an entire loss of their suitable habitats under both climate and dispersal scenarios. Temperature annual range and isothermality were the most critical key variables explaining the potential distribution of these three Juniperus species; they contribute by 16–56.1% and 20.4–38.3%, respectively. Accounting for the use of different thresholds provides a balanced approach for species distribution models’ applications in conservation assessment when the goal is to assess potential climatic suitability in new geographical areas. Therefore, south Sichuan and north Yunnan could be considered important priority conservation areas for in situ conservation and search for unknown populations of these three Juniperus species.

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Predicting the Future Distribution of Ara rubrogenys, an Endemic Endangered Bird Species of the Andes, Taking into Account Trophic Interactions

Diversity ◽

10.3390/d13020094 ◽

2021 ◽

Vol 13 (2) ◽

pp. 94

Author(s):

Alain Hambuckers ◽

Simon de Harenne ◽

Eberth Rocha Ledezma ◽

Lilian Zúñiga Zeballos ◽

Louis François

Keyword(s):

Food Resource ◽

Bird Species ◽

Co2 Concentration ◽

Distribution Models ◽

Plant Resources ◽

Term Survival ◽

The Andes ◽

Vegetation Models ◽

Fertilizing Effect ◽

The Impact

Species distribution models (SDMs) are commonly used with climate only to predict animal distribution changes. This approach however neglects the evolution of other components of the niche, like food resource availability. SDMs are also commonly used with plants. This also suffers limitations, notably an inability to capture the fertilizing effect of the rising CO2 concentration strengthening resilience to water stress. Alternatively, process-based dynamic vegetation models (DVMs) respond to CO2 concentration. To test the impact of the plant modelling method to model plant resources of animals, we studied the distribution of a Bolivian macaw, assuming that, under future climate, DVMs produce more conservative results than SDMs. We modelled the bird with an SDM driven by climate. For the plant, we used SDMs or a DVM. Under future climates, the macaw SDM showed increased probabilities of presence over the area of distribution and connected range extensions. For plants, SDMs did not forecast overall response. By contrast, the DVM produced increases of productivity, occupancy and diversity, also towards higher altitudes. The results offered positive perspectives for the macaw, more optimistic with the DVM than with the SDMs, than initially assumed. Nevertheless, major common threats remain, challenging the short-term survival of the macaw.

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