Seed bank formation and removal of Pinus hartwegii (Pinaceae) seeds along an altitudinal gradient in the Cofre de Perote National Park, Veracruz, Mexico

Tejeda-Landero, Víctor Manuel; Sánchez-Velásquez, Lázaro Rafael; Viveros-Viveros, Héctor; Aparicio-Rentería, Armando; Flores‐Peredo, Rafael

doi:10.17129/botsci.2204

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…The distribution patterns of the devitalized trees found in the present study may also be related to the decline in the reproductive performance of this species with respect to an altitudinal gradient. For example, Tejeda-Landero et al [92] evaluated the viability of P. hartwegii seeds at four altitudes (3400, 3600, 3800, and 4000 m) within the Cofre de Perote National Park, Veracruz, Mexico. The main results of this study showed that the highest values of seed viability occurred at the upper limits, in contrast to those of the lower altitude site.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the Vigor of Pinus hartwegii Lindl. along an Altitudinal Gradient Using UAV Multispectral Images: Evidence of Forest Decline Possibly Associated with Climatic Change

Gallardo-Salazar

Lindig‐Cisneros

López-Toledo

et al. 2023

Forests

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Future climate forecasts predict major changes that will have negative impacts on the distribution, abundance, and dynamics of forest ecosystems. In Mexico, there is evidence of symptoms of massive forest decline; however, there is no consensus in terms of attributing these symptoms to climate change. This study aimed to provide evidence of forest decline possibly associated with climatic change in the highland pine (Pinus hartwegii Lindl.) populations of the Nevado de Toluca Flora and Fauna Protection Area. Using unmanned aerial vehicles (UAV) equipped with multispectral sensors, the study applied digital photogrammetry techniques, automated tree crown detection algorithms, and calculation of the normalized difference vegetation index (NDVI) and leaf chlorophyll index (LCI) to assess forest health across an altitudinal transect (from 3300 m to the timberline at 4040 m elevation). Climate analysis was conducted with TerraClimate data using mean annual temperature (MAT), April temperature, and Palmer Drought Severity Index (PDSI) from the studied altitudinal transect and its xeric limit. We found that lower altitude populations had significantly higher stress levels, indicating forest decline phenomena, while intermediate altitude populations showed greater vigor of the detected trees. Statistically significant differences in the NDVI and LCI values along the altitudinal gradient provided evidence of forest decline in terms of forest vigor and productivity, with the greatest disturbance found at the lower altitude of the examined forest species. The analysis of the climatic data revealed an increase in April temperature +1.4 °C of the xeric limit of the transect (low altitude) when comparing the reference period, 1961–1990 (mean: 12.17 °C), with the decade prior to our study (2011–2020; mean: 13.57 °C). This would be equivalent to an upward shift in elevation of 280 m of the xeric limit. In addition, the PDSI analysis revealed that droughts are becoming increasingly intense at a rate of 0.06 PDSI units per decade, with greater intensity in the last five years. These findings highlight the negative impacts of climate change on forest ecosystems and the urgent need for alternative forest management and conservation practices to increase resilience and adaptation in the temperate forests of Mexico. This study sets a precedent for further research to improve our understanding of the impacts of climate change on forest ecosystems and the development of sustainable management practices.

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Section: Discussionmentioning

confidence: 99%

Analysis of the Vigor of Pinus hartwegii Lindl. along an Altitudinal Gradient Using UAV Multispectral Images: Evidence of Forest Decline Possibly Associated with Climatic Change

Gallardo-Salazar

Lindig‐Cisneros

López-Toledo

et al. 2023

Forests

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“…de la vegetación arbórea en México y, muy importante, en los servicios ecosistémicos de regulación (Alfaro-Ramírez et al 2020). La especie tiene ciclos semilleros hasta de cinco años y, en las últimas décadas, su producción de semilla ha decrecido dramáticamente, lo cual se refleja en una limitada regeneración natural (Tejeda-Landero et al 2019). Algunos estudios señalan que la especie tendrá una disminución en su área de distribución de hasta el 80 %, con impacto negativo para su ecosistema (Gutiérrez y Trejo 2014).…”

Section: Introductionunclassified

Enraizamiento de estacas de Pinus hartwegii de tres poblaciones naturales en ecosistemas de alta montaña del Estado de México y Veracruz

Melo¹,

Casas²,

Ramírez-Herrera³

et al. 2021

Bosque (Valdivia)

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The limited seed production of Pinus hartwegii Lidl. requires the use of vegetative propagation techniques to produce plants for reforestation of the high mountain ecosystems. Nothing about vegetative propagation of the species has been done to our knowledge, therefore its ability to root propagules is, so far, unknown. In this study, the rooting of cuttings from three populations of P. hartwegii was evaluated, testing three treatments of Indole Butyric Acid (IBA, Radix®) (0, 5,000 and 10,000 ppm). The experiment was established in rooting chambers under a randomized four-block design with factorial arrangement. The rooted cuttings were transplanted and kept in a greenhouse. Survival, number of rooted cuttings, length and number of primary and secondary roots were evaluated after 12 weeks. Regardless of the auxin treatment, high percentages of rooting were observed in the cuttings. The auxin in 5,000 ppm amplified and improved the response to rooting (96.6 %); while the concentration of 10,000 ppm caused toxicity, which was reflected in the lower survival of the cuttings (63.5 %). The cuttings of the three populations showed high percentages of survival (> 80 %) and rooting (> 67 %); although without significant differences among them. A hundred percent of the rooted cuttings survived transplant. Massive multiplication through cuttings rooting is feasible for P. hartwegii, regardless of the genotype. With the application of exogenous auxins (5,000 ppm) the regeneration and development of roots was favored.

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Calidad de semilla y crecimiento de planta en poblaciones y altitudes de Pinus hartwegii Lindl

Mendoza

Casas

Ramírez-Herrera

et al. 2022

RMCF

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La reproducción y el crecimiento de especies de alta montaña adaptadas a bajas temperaturas, podrían afectarse por el calentamiento global, particularmente en altitudes marginales donde el estrés es más intenso. En este estudio se evaluó la calidad de semilla y el crecimiento inicial en varios gradientes altitudinales de tres poblaciones (dos del Estado de México y una de Veracruz) de Pinus hartwegii, donde las semillas se recolectaron entre 3 400 y 4 100 msnm. El diseño experimental fue completamente al azar y se registraron datos de germinación de semillas, rompimiento del estado cespitoso y crecimiento de plantas. La capacidad germinativa de las semillas fue de 87 %, con valor pico de 3.2 y germinativo de 10.9, pero con variación significativa entre poblaciones y gradientes. La menor capacidad germinativa (50 %) se obtuvo con semillas procedentes del mayor gradiente altitudinal (4 100 m). El rompimiento del estado cespitoso varió según la población y altitud. Respecto a las plántulas de Veracruz, 75 % de ellas rompieron el estado cespitoso a los cinco meses de edad, en contraste con las del Estado de México, cuyo registro fue menor a 35 %. Referente a la altitud, las plantas procedentes del mayor intervalo prolongaron el rompimiento del estado cespitoso por más de dos meses, lo cual influyó en el bajo crecimiento inicial de las plantas. Lo anterior indica que la población de 4 000 m podría estar en declinación, a diferencia de los otros gradientes altitudinales que mostraron excelente calidad de semillas y crecimiento de plantas.

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Seed bank formation and removal of Pinus hartwegii (Pinaceae) seeds along an altitudinal gradient in the Cofre de Perote National Park, Veracruz, Mexico

Cited by 3 publications

References 45 publications

Analysis of the Vigor of Pinus hartwegii Lindl. along an Altitudinal Gradient Using UAV Multispectral Images: Evidence of Forest Decline Possibly Associated with Climatic Change

Analysis of the Vigor of Pinus hartwegii Lindl. along an Altitudinal Gradient Using UAV Multispectral Images: Evidence of Forest Decline Possibly Associated with Climatic Change

Enraizamiento de estacas de Pinus hartwegii de tres poblaciones naturales en ecosistemas de alta montaña del Estado de México y Veracruz

Calidad de semilla y crecimiento de planta en poblaciones y altitudes de Pinus hartwegii Lindl

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