Disentangling plasticity of serotiny, a key adaptive trait in a Mediterranean conifer

Martín-Sanz, Ruth C.; Blanco, Luis Santos del; Notivol, Eduardo; Chambel, María Regina; Martín, Roberto San; Climent, José

doi:10.3732/ajb.1600199

Cited by 25 publications

(27 citation statements)

References 75 publications

(127 reference statements)

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“…Serotiny, mother plant age and fire severity effects on Pinus pinaster germination by Martín-Sanz et al (2016) in P. halepensis. The fact that cones of the young mother plants in this study are all serotinous could be attributed to a strong selection of this hereditary trait induced by fire.…”

Section: Iforest -Biogeosciences and Forestrymentioning

confidence: 99%

“…If fire frequency exceeds the minimum time for the pines to produce viable seeds, their persistence could be compromised. On the other hand, if the time between two consecutive fires on the same area greatly increases the serotiny could be lost due to maintenance costs (Martín-Sanz et al 2016), to climatic factors or both (Espelta et al 2011, Martín-Sanz et al 2016.…”

Section: Introductionmentioning

confidence: 99%

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Role of serotiny on Pinus pinaster Aiton germination and its relation to mother plant age and fire severity

Cruz¹,

García-Duro²,

Casal³

et al. 2019

iForest

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Serotiny degree may hypothetically depend on mother plant age and fire severity, and fire severity can strongly affect the regeneration of Pinus pinaster Aiton, which is an obligate seeder species with aerial seed banks stocked in cones showing a certain degree of serotiny. The main objective of this study was to evaluate the effect of serotiny and mother plant age on seed germination of P. pinaster in relation to fire severity. For this purpose, cones were collected in two stands from mother trees of different ages. Serotinous cones were opened in oven at increasing temperatures to determine the number of seeds released. The length of cones and the number and weight of seeds were measured. Seeds from both classes of mother plant age were subjected to 34 different treatments simulating different fire severity levels, and their germination was recorded. The results showed that serotiny was significantly higher in cones from young mother trees. Seed germination in the control groups from serotinous cones was always higher than that from non-serotinous cones without thermal shock. Fire severity decreased seed germination as fire severity increases in both mother age classes. Mother plant age was related to the serotiny level, which was higher in young than in old trees, suggesting a strong selection in the population due to a recent fire.

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Section: Iforest -Biogeosciences and Forestrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of serotiny on Pinus pinaster Aiton germination and its relation to mother plant age and fire severity

Cruz¹,

García-Duro²,

Casal³

et al. 2019

iForest

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“…In Spain, a large variability in the degree of serotiny has been observed among populations across geographical gradients revealing that serotiny may increase with stand density and from northern to southern populations (Moya et al, 2007(Moya et al, , 2008de las Heras et al, 2012). Recently, studies conducted in common garden experiments have demonstrated, after controlling for the effects of tree size, that serotiny has a genetic basis and it is lower in pines from harsh (dry and cold) sites compared with mild sites (Martín-Sanz et al, 2016), while is more abundant on post-fire stands than on stands established in fire-free conditions (Ne'eman et al, 2004).…”

Section: Flowering Fruiting and Seed Productionmentioning

confidence: 99%

Natural regeneration in Iberian pines: A review of dynamic processes and proposals for management

et al. 2017

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Aim of study: Designing adequate silvicultural systems for natural regeneration of a forest species requires sound knowledge of the underlying ecological subprocesses: flowering and fruiting, seed dispersal and predation, seed germination, seedling emergence and seedling survival. The main objective of the present work is to carry out a review on the current knowledge about the different subprocesses governing the regeneration process for the main Iberian Pinus species, in order to propose scientifically based management schedules.Area of study: The review focuses on the five main native Pinus species within their most representative areas in the Iberian Peninsula: Pinus nigra in Cuenca mountains, Pinus sylvestris in Sierra de Guadarrama, Pinus pinaster and Pinus pinea in the Northern Plateau and Pinus halepensis in Catalonia.Material and methods: Firstly, currently available information on spatiotemporal dynamics and influential factors is introduced for each subprocess and species. Secondly, current regeneration strategies are characterized and the main bottlenecks are identified. Finally, alternative silvicultural practices proposed on the light of the previous information are presented.Main results: Different climate-mediated bottlenecks have been identified to limit natural regeneration of the Iberian pine species, with seed predation and initial seedling survival among the most influential. New approaches focusing on more gradual regeneration fellings, extended rotation periods, prevent big gaps and program fellings on mast years are presented.Research highlights: Natural regeneration of the studied species exhibit an intermittent temporal pattern, which should be aggravated under drier scenarios. More flexible management schedules should fulfil these limitations.Additional keywords: seed production; seed dispersal; seed predation; germination; regeneration fellings.Correspondence should be addressed to Rafael Calama: rcalama@inia.es

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“…The species has a very short juvenile phase (Thanos and Daskalakou, 2000; Climent et al, 2008; Espelta et al, 2008), and builds canopy seed banks (Daskalakou and Thanos, 1996) consisting of both serotinous and non-serotinous cones with anatomically-different scales (Moya et al, 2008), whose ratio is dependent on both environmental and ontogenetic factors (Martín-Sanz et al, 2016). During its life cycle, this species progressively modifies the microenvironment to which its offspring are exposed through pre-fire litter production and necromass retention in the crown, which in turn affect fire intensity and post-fire products (Schwilk and Ackerly, 2001).…”

Section: Introductionmentioning

confidence: 99%

Repeated Stand-Replacing Crown Fires Affect Seed Morphology and Germination in Aleppo pine

et al. 2017

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Post-fire reproductive niche of Aleppo pine (Pinus halepensis) is deeply interlaced with fire products. Indeed, the high pH and low osmotic potentials of ash beds under burnt crowns constitute the main constraints to seed germination. In this study, we aim to investigate whether fire recurrence, through the physico-chemical constraints imposed by the ash beds, affects the reproduction ability of P. halepensis at the germination stage. To this aim, Aleppo pine seeds were collected in neighboring even-aged stands subjected to 0, 1, or 2 fires (namely fire cohorts), and seed morphology and germination performance, in terms of cumulative germination and germination kinetics, were studied under increasing osmotic potentials (from 0.0 to −1.2 MPa) and pH (from 6 to 11). Besides fire history, the role of ontogenetic age of mother plants on seed morphology and germination was also investigated. Differences in seed morphology among the three cohorts have been highlighted in a multivariate context, with anisotropic enlargement of the seeds produced by pine stands experiencing repeated fires. The patterns of seed germination varied primarily in relation to the fire cohort, with seeds from the pine stand experiencing repeated fires exhibiting enhanced tolerance to pH stress. Conversely, germination performances under osmotic constraints mainly depends on tree ontogenetic stage, with an involvement of fire history especially in the timing of seed germination. Our results suggest that, at least in the short term, fire recurrence does not constrain the reproduction ability of Aleppo pine. These results highlight the need for further research to elucidate the mechanisms behind these responses to recurrent fires.

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Disentangling plasticity of serotiny, a key adaptive trait in a Mediterranean conifer

Abstract: Growth-limiting environments exacerbated the precocious release of seeds, contrary to the ecotypic trend found for the aerial cone bank, suggesting a counter-gradient plasticity. This plastic response is potentially maladaptive under a scenario of frequent wildfires.

Cited by 25 publications

References 75 publications

Role of serotiny on Pinus pinaster Aiton germination and its relation to mother plant age and fire severity

Role of serotiny on Pinus pinaster Aiton germination and its relation to mother plant age and fire severity

Natural regeneration in Iberian pines: A review of dynamic processes and proposals for management

Repeated Stand-Replacing Crown Fires Affect Seed Morphology and Germination in Aleppo pine

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