Developing landscape habitat models for rare amphibians with small geographic ranges: a case study of Siskiyou Mountains salamanders in the western USA

Suzuki, Nobuya; Olson, Deanna H.; Reilly, Edward C.

doi:10.1007/s10531-007-9281-4

Cited by 39 publications

(21 citation statements)

References 20 publications

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“…We then dismissed the climate variable with the lower explanatory power according to the Akaike information criterion (AIC). The chosen correlation threshold allowed fitting of linear models (degrees of freedom ≥ 1), and it was in the range of previously reported values (| r |= 0.4 in Suzuki et al, 2008, | r |= 0.85 in Elith et al, 2006). In the second step, we selected those climate variables from the collinearity-corrected data sets that resulted in the best linear regression models with 1 up to k variables, with k being the number of climate variables after collinearity correction.…”

Section: Statisticsmentioning

confidence: 83%

NEP of a Swiss subalpine forest is significantly driven not only by current but also by previous year's weather

Zielis¹,

Etzold

Zweifel

et al. 2014

Biogeosciences

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Abstract. Understanding the response of forest net ecosystem productivity (NEP) to environmental drivers under climate change is highly relevant for predictions of annual forest carbon (C) flux budgets. Modeling annual forest NEP with soil-vegetation-atmosphere transfer models (SVATs), however, remains challenging due to unknown delayed responses to weather of the previous year. In this study, we addressed the influence of previous year's weather on the interannual variability of NEP for a subalpine spruce forest in Switzerland. Analysis of long-term (1997-2011) eddy covariance measurements showed that the Norway spruce forest Davos Seehornwald was a consistent sink for atmospheric CO 2 , sequestering 210 ± 88 g C m −2 yr −1 on average. Previous year's weather strongly affected interannual variability of NEP, increasing the explained variance in linear models to 53 % compared to 20 % without accounting for previous year's weather. Thus, our results highlight the need to consider previous year's weather in modeling annual C budgets of forests. Furthermore, soil temperature in the current year's spring played a major role controlling annual NEP, mainly by influencing gross primary productivity early in the year, with spring NEP accounting for 56 % of annual NEP. Consequently, we expect an increase in net CO 2 uptake with future climate warming, as long as no other resources become limiting.

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Section: Statisticsmentioning

confidence: 83%

NEP of a Swiss subalpine forest is significantly driven not only by current but also by previous year's weather

Zielis¹,

Etzold

Zweifel

et al. 2014

Biogeosciences

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“…We constructed a set of AVs from each dataset using Arcview GIS 3.3: (1) the mean density of human population, (2) the proportion of agriculture area, (3) the proportion of urban area. To account for scale effects (Meyer and Thuiller 2006;Suzuki et al 2008), these variables were summarized across circular buffers with radii of 5, 15 and 25 km centered at survey sites. The proportion of agriculture area was calculated as the sum of the proportions of the CLC categories associated with intensive agricultural practices.…”

Section: Anthropogenic and Natural Factorsmentioning

confidence: 99%

Assessing range re-expansion and recolonization of human-impacted landscapes by threatened species: a case study of the otter (Lutra lutra) in Italy

Marcelli¹,

Fusillo²

2009

Biodivers Conserv

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Detecting and understanding recoveries of threatened species from past and recent presence/absence data is essential to improving conservation efforts. However, false positive trends may be reported because of false absences in past data, therefore appropriate testing is needed. We tested an expansion/recolonization of the otter (Lutra lutra) populations in Italy from a fragmented distribution outlined in the 1984-1985 period by using Monte Carlo simulations. Land-use changes, human depopulation and decrease in influence of anthropogenic features were investigated as potential drivers of recolonization by using GIS modeling. A survey of the entire Italian range of the otter, conducted in 2002-2004, recorded a 2.2-fold increase in the proportion of occupied 10-km squares and 49 local colonizations. The range size and proportion of urban land-use in the 1984-1985 distribution were smaller (P \ 0.05) than those derived from simulated surveys based on 49 random false absences versus colonization events. The distribution range expanded southward and nearly reached the southern margins of the peninsula. Recolonization of moderately urbanized landscapes was not accompanied by human depopulation. According to partial logistic regressions, the pure effect of urban land proportion and industry proximity on otter occurrence probability declined by about 48%, suggesting a decreased impact on the stream habitat. Conversely, natural factors, increased in importance by about 116%. The absence of a significant northward expansion in the 20 year period suggests that northward habitat restoration should be planned to encourage further recolonization. On the other hand, potential urban threats in the newly occupied landscapes should be controlled.

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“…For the Appalachian Mountains, these differences generally mean a more xeric landscape for south‐facing slopes and more mesic conditions on northerly slopes (Desta, Colbert, Rentch, & Gottschalk, ). Lungless salamanders are dependent on moist microhabitats (Peterman & Semlitsch, ), and thus northern slopes are generally more favorable and this has been shown to be important in describing salamander abundance in other species such as Plethodon stormi (Suzuki, Olson, & Reilly, ) and in Salamandrina (Romano et al, ). Although species abundance and gene flow are not directly related, it is not unreasonable to expect areas with lower abundance to correlate with increased dispersal resistance.…”

Section: Discussionmentioning

confidence: 99%

North‐facing slopes and elevation shape asymmetric genetic structure in the range‐restricted salamander Plethodon shenandoah

Mulder

Cortés-Rodríguez

Grant

et al. 2019

Ecology and Evolution

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Species with narrow environmental tolerances are often distributed within fragmented patches of suitable habitat, and dispersal among these subpopulations can be difficult to directly observe. Genetic data can help quantify gene flow between localities, which is especially important for vulnerable species with a disjunct range. The Shenandoah salamander ( Plethodon shenandoah ) is a federally endangered species known only from three mountaintops in Virginia, USA. To reconstruct the evolutionary history and population connectivity of this species, we generated both mitochondrial and nuclear data using sequence capture from individuals collected across all three mountaintops. Applying population and landscape genetic methods, we found strong population structure that was independent of geographic distance. Both the nuclear markers and mitochondrial genomes indicated a deep split between the most southern population and the genetically similar central and northern populations. Although there was some mitochondrial haplotype‐splitting between the central and northern populations, there was admixture in nuclear markers. This is indicative of either a recent split or current male‐biased dispersal among mountain isolates. Models of landscape resistance found that dispersal across north‐facing slopes at mid‐elevation levels best explain the observed genetic structure among populations. These unexpected results highlight the importance of incorporating landscape features in understanding and predicting the movement and fragmentation of this range‐restricted salamander species across space.

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Developing landscape habitat models for rare amphibians with small geographic ranges: a case study of Siskiyou Mountains salamanders in the western USA

Cited by 39 publications

References 20 publications

NEP of a Swiss subalpine forest is significantly driven not only by current but also by previous year's weather

NEP of a Swiss subalpine forest is significantly driven not only by current but also by previous year's weather

Assessing range re-expansion and recolonization of human-impacted landscapes by threatened species: a case study of the otter (Lutra lutra) in Italy

North‐facing slopes and elevation shape asymmetric genetic structure in the range‐restricted salamander Plethodon shenandoah

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