Germination responses of two key mountain tree species to single and combined fire-related stresses: does elevational origin matter?

Cáceres, Yolanda; Lachmuth, Susanne; Schrieber, Karin; Marcora, Paula Inés; Renison, Daniel; Hensen, Isabell

doi:10.1016/j.flora.2021.151832

Cited by 7 publications

(8 citation statements)

References 67 publications

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“…In our study, at the low site the local origin population had higher seed germination than the high origin one (Figure 4(a)), suggesting an adaptation to local environmental conditions. Our results are in line with those reported by Cáceres et al [61], who exposed P. australis seeds from different elevations to drought and heat stress, and found that seeds from intermediate and high origins were less resistant than seeds from low origin. In agreement with those findings, seed germination of the low origin of our study seems to be less adapted to environmental conditions at the mid-and high elevations, where frost events occur throughout the year [62].…”

Section: Disentangling the Effects Of Origin And Elevation Site On Each Performance Variablesupporting

confidence: 93%

Are populations of Polylepis australis locally adapted along their elevation gradient?

Marcora

Tecco

Ferrero

et al. 2021

Neotropical Biodiversity

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Mountain ecosystems are characterized by steep environmental gradients. Species with broad elevation distribution are exposed to contrasting climatic conditions along their gradients. In response to those changes, species might develop ecotypes adapted to the local climate. Early regeneration is the most critical stage for plant populations and, therefore, withstands strong selection pressures. Previous studies showed a unimodal pattern of intraspecific variability in fitness components among Polylepis australis populations along their elevation gradient in the mountains of central Argentina. Whether this variability is the result of local populations' adjustments to their respective site remains unknown. We tested the hypothesis that P. australis populations from different elevations would be locally adapted to their local environments, where they would perform better than populations from other elevations (origins). We applied an experimental approach by establishing common gardens at three contrasting elevations. Seeds and saplings of P. australis populations from the low, mid-and high elevation belts of the species distribution gradient (i.e. three origins) were reciprocally sown and transplanted in three elevation sites (low, mid-and high). Seed germination success, sapling growth and mortality were monitored for three years. Our main results show that the origin of populations influenced germination success and sapling growth, whereas sapling mortality was marginally affected. Populations of both elevation extremes seem to be more adjusted to local conditions than the population from the intermediate elevation, probably due to the harsher environmental conditions for plant regeneration typical of the lower and upper elevation belts of semiarid mountains. Finally, our results strongly suggest that temperature rise due to climate change in this mountain area might have negative effects on the regeneration of P. australis populations.

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Section: Disentangling the Effects Of Origin And Elevation Site On Each Performance Variablesupporting

confidence: 93%

Are populations of Polylepis australis locally adapted along their elevation gradient?

Marcora

Tecco

Ferrero

et al. 2021

Neotropical Biodiversity

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“…In many stands of P. australis , there is evidence of fire that is set to induce grass regrowth as feed for livestock ( Renison et al 2002 , 2006 , 2013 ; Argibay and Renison 2018 ). Fire, logging and browsing affect P. australis forests and a reduction of such disturbances would increase the area covered by these forests and the vitality of the trees ( Renison et al 2011 , 2013 ; Cáceres et al 2021 ). However, moderate livestock densities are compatible with forest conservation, if properly managed ( Giorgis et al 2020 ).…”

Section: Taxonomic Treatmentmentioning

confidence: 99%

A monograph of the genus Polylepis (Rosaceae)

Espinoza¹,

Kessler²

2022

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We present a monograph of the high Andean tree genus Polylepis (Rosaceae), based on a species concept considering morphological, climatic and biogeographic distinctness as indicators of evolutionary independence. In total, we recognize 45 species of Polylepis, grouped in five sections. Polylepis sect. Sericeae is represented by 15 species in four subsections, P. sect. Reticulatae by seven species, P. sect. Subsericantes by three species, P. sect. Australes by two species and P. sect. Incanaee by three subsections with 18 species. We describe seven new species, one from Colombia (P. frontinensis), one from Ecuador (P. simpsoniae) and five from Peru (P. acomayensis, P. fjeldsaoi, P. occidentalis, P. pilosissima and P. sacra). Three species from Peru (P. albicans, P. pallidistigma and P. serrata) are re-instated as valid species. Two taxa from Bolivia (P. incanoides and P. nana) are elevated from subspecies to species rank. The morphology, habitat, distribution, ecology and conservation status of each species are documented. We also provide an identification key to the species of the genus and general introductions on taxonomic history, morphology, evolution, ecology and conservation.

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“…plant syndromes; see Chapin et al 1993). In the mountains of central Argentina, in response to the marked changes in environmental conditions across elevation, from the hot semi-arid climate of the lowlands to the cool humid highlands, several plant species, such as Gymnocalycium monvillei, Polylepis australis, Escallonia cordobensis and Maytenus boaria, show intraspeci c trait variation along elevation gradients (Bauk et al2017;Cáceres et al 2021;Marcora et al 2017Marcora et al , 2021Schrieber et al 2020). The South American tree Maytenus boaria is distributed along a broad elevation range, where populations show clinal variation in functional traits (Marcora et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Drought and herbivory as modulators of intraspecific differentiation in seedlings of a mountain tree

et al. 2023

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In mountain ecosystems, plant regeneration might be constrained by multiple factors that change along elevation gradients. Those factors might in uence the expression of different traits among populations. Drought and herbivory are strong lters for seedling establishment and, therefore, important selective pressures. Populations of the tree Maytenus boaria support lower soil moisture and higher herbivory pressure at low elevations than at midelevations in Córdoba Mountains, central Argentina. Consequently, we expect that populations from the low elevation perform better in response to both factors than populations from mid-elevations.Seedlings from the two elevation origins were exposed to two levels of simulated drought and herbivory in a greenhouse experiment. The selected elevations corresponded to the lowest edge of species distribution (with driest soils and highest herbivory pressure) and the central mid-elevation. Performance-related variables, biomass allocation patterns and several morphological and physiological traits were measured.Seedlings from the low origin showed lower mortality, leaf number and water potential in response to drought than seedlings from the mid-origin. Herbivory affected the performance of seedlings and many plant traits, irrespective of the origin. The interaction between drought and herbivory increased the drought effects on some variables.Seedlings of M. boaria from the low elevation, where conditions are drier and warmer, provide more droughttolerant offspring than those from the cooler and moister mid-elevation.

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Germination responses of two key mountain tree species to single and combined fire-related stresses: does elevational origin matter?

Cited by 7 publications

References 67 publications

Are populations of Polylepis australis locally adapted along their elevation gradient?

Are populations of Polylepis australis locally adapted along their elevation gradient?

A monograph of the genus Polylepis (Rosaceae)

Drought and herbivory as modulators of intraspecific differentiation in seedlings of a mountain tree

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Germination responses of two key mountain tree species to single and combined fire-related stresses: does elevational origin matter?

Cited by 7 publications

References 67 publications

Are populations of Polylepis australis locally adapted along their elevation gradient?

Are populations of Polylepis australis locally adapted along their elevation gradient?

﻿A monograph of the genus Polylepis (Rosaceae)

Drought and herbivory as modulators of intraspecific differentiation in seedlings of a mountain tree

Contact Info

Product

Resources

About

A monograph of the genus Polylepis (Rosaceae)