Multi-scale land cover dynamics of semiarid scrubland in Baja California, Mexico

Vergés, Fernando Antonio Rosete; Bocco, Gerardo; Espejel, Ileana

doi:10.1007/s10113-013-0574-8

Cited by 10 publications

(7 citation statements)

References 52 publications

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Section: Introductionmentioning

confidence: 99%

“…Recently, the natural habitat of Y. capensis has suffered a rapid transformation due to farming expansion, growth of urban patches, touristic developments and rural road opening that indirectly affect the natural populations through the activities they enable (Rosete-Verges et al 2008, 2014Lagunas-V azques et al 2013). The fragmentation of natural habitat in this region affects the demography and connectivity of populations of several species, but little is known about this process.…”

Section: Introductionmentioning

confidence: 99%

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High genetic diversity and low structure in an endemic long‐lived tree, Yucca capensis (Asparagaceae)

et al. 2021

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Endemic species distributed in fragmented habitats are highly vulnerable to extinction because they may have low genetic diversity. However, some life-history traits can mitigate the effect of genetic drift on populations. We analysed the level and distribution of genetic variation and ancestral population size of Yucca capensis, a long-lived endemic plant of the Baja California Peninsula, Mexico. Its populations are scattered across a habitat that is suffering accelerated transformation.• We used six nuclear microsatellites to genotype 224 individuals from 17 locations across the entire species' geographic range. We estimated polymorphisms, heterozygosity and genetic structure. We also evaluated the ancestral and recent effective size and time since the population started to change.• We found high heterozygosity, high polymorphism and low differentiation among locations, suggesting a panmictic population across the range. We also detected a large ancestral effective population size, which suffered a strong reduction in the Mid-Holocene.• Despite changes in environmental conditions caused by habitat modification, the high diversity and low differentiation in Y. capensis may result from its large ancestral effective size and life-history traits, such as plant longevity, clonal growth and mating system, which reduce the rate of loss of genetic variation. However, the dependence on a specialist pollinator that displays short flight range can reduce gene flow among the plant populations and could, shortly, lead them into an extinction vortex.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High genetic diversity and low structure in an endemic long‐lived tree, Yucca capensis (Asparagaceae)

et al. 2021

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“…In semiarid ecosystems, the extension of agricultural land area for cultivation of crops has caused the replacement of the original vegetation, typically scrublands, and thereby a dramatic loss of floral and faunal biodiversity 1,2 . Converting scrublands to croplands strongly effects soil properties introducing frequent irrigation and mixing by tillage to previously water-limited, stratified systems with low nutrient input 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Contrasting microbial community responses to salinization and straw amendment in a semiarid bare soil and its wheat rhizosphere

Szoboszlay

Näther

Liu

et al. 2019

Sci Rep

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Soil salinization is a major constraint of agriculture in semiarid ecosystems. In this study soil microcosms were applied to evaluate the impact of a lower- and higher-level salinization treatment of a pristine scrubland soil on the abundance of Bacteria , Archaea , and Fungi , and on prokaryotic diversity in bare soil and the rhizosphere of wheat assessed by qPCR and high-throughput sequencing of 16S rRNA gene amplicons. Furthermore, the impact of soil straw amendment as a salt-stress alleviation strategy was studied. While the low-level salinity stimulated plant growth, the seedlings did not survive under the higher-level salinity unless the soil was amended with straw. Without the straw amendment, salinization had only minor effects on the microbial community in bare soil. On the other hand, it decreased prokaryotic diversity in the rhizosphere of wheat, but the straw amendment was effective in mitigating this effect. The straw however, was not a significant nutrient source for the rhizosphere microbiota but more likely acted indirectly by ameliorating the salinity stress on the plant. Members of Proteobacteria , Actinobacteria , and Firmicutes were abundant among the bacteria that reacted to soil salinization and the straw amendment but showed inconsistent responses indicating the large physiological diversity within these phyla.

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“…The standardized coefficient ( ) obtained for the socioeconomic factors shows that the population growth, marginalization index, and population density had a nonsignificant impact on forest cover loss in the basin. The socioeconomic factors showed a weak statistical relationship, since they do not present a single independent effect on deforestation processes, as reported in other studies [53,71].…”

Section: Adjustment and Evaluation Of Spatial Logistic Regression (Slmentioning

confidence: 44%

Proximate and Underlying Deforestation Causes in a Tropical Basin through Specialized Consultation and Spatial Logistic Regression Modeling

Plata-Rocha

Monjardín-Armenta

Pacheco-Angulo

et al. 2021

Land

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The present study focuses on identifying and describing the possible proximate and underlying causes of deforestation and its factors using the combination of two techniques: (1) specialized consultation and (2) spatial logistic regression modeling. These techniques were implemented to characterize the deforestation process qualitatively and quantitatively, and then to graphically represent the deforestation process from a temporal and spatial point of view. The study area is the North Pacific Basin, Mexico, from 2002 to 2014. The map difference technique was used to obtain deforestation using the land-use and vegetation maps. A survey was carried out to identify the possible proximate and underlying causes of deforestation, with the aid of 44 specialized government officials, researchers, and people who live in the surrounding deforested areas. The results indicated total deforestation of 3,938.77 km2 in the study area. The most important proximate deforestation causes were agricultural expansion (53.42%), infrastructure extension (20.21%), and wood extraction (16.17%), and the most important underlying causes were demographic factors (34.85%), economics factors (29.26%), and policy and institutional factors (22.59%). Based on the spatial logistic regression model, the factors with the highest statistical significance were forestry productivity, the slope, the altitude, the distance from population centers with fewer than 2500 inhabitants, the distance from farming areas, and the distance from natural protected areas.

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Multi-scale land cover dynamics of semiarid scrubland in Baja California, Mexico

Cited by 10 publications

References 52 publications

High genetic diversity and low structure in an endemic long‐lived tree, Yucca capensis (Asparagaceae)

High genetic diversity and low structure in an endemic long‐lived tree, Yucca capensis (Asparagaceae)

Contrasting microbial community responses to salinization and straw amendment in a semiarid bare soil and its wheat rhizosphere

Proximate and Underlying Deforestation Causes in a Tropical Basin through Specialized Consultation and Spatial Logistic Regression Modeling

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