Thermal niche for in situ seed germination by Mediterranean mountain streams: model prediction and validation for Rhamnus persicifolia seeds

Porceddu, Marco; Mattana, Efisio; Pritchard, Hugh W.; Bacchetta, Gianluigi

doi:10.1093/aob/mct238

Cited by 42 publications

(52 citation statements)

References 47 publications

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“…Through both intra-and interspecific comparisons of species' responses to ex situ and in situ environments, insights have been gained of the spatial and temporal components of emergence, with apparent universal applicability across habitats and lifeforms (D€ urr et al, 2015;Orr u et al, 2012;Porceddu, Mattana, Pritchard, & Bacchetta, 2013;Pritchard, Steadman, Nash, & Jones, 1999;Steadman & Pritchard, 2004). Recently, thermal time modelling has been applied to a limited number of species to predict and validate germination performance under various climate change scenarios (Fern andez-Pascual et al, 2015;Ordoñez-Salanueva et al, 2015;Orr u et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

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Daws

Flores

et al. 2017

Global Change Biology

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Recruitment from seeds is among the most vulnerable stage for plants as global temperatures change. While germination is the means by which the vast majority of the world's flora regenerate naturally, a framework for accurately predicting which species are at greatest risk of germination failure during environmental perturbation is lacking. Taking a physiological approach, we assess how one family, the Cactaceae, may respond to global temperature change based on the thermal buffering capacity of the germination phenotype. We selected 55 cactus species from the Americas, all geo-referenced seed collections, reflecting the broad environmental envelope of the family across 70° of latitude and 3700 m of altitude. We then generated empirical data of the thermal germination response from which we estimated the minimum (T ), optimum (T ) and ceiling (T ) temperature for germination and the thermal time (θ ) for each species based on the linearity of germination rate with temperature. Species with the highest T and lowest T germinated fastest, and the interspecific sensitivity of the germination rate to temperature, as assessed through θ , varied tenfold. A left-skewed asymmetry in the germination rate with temperature was relatively common but the unimodal pattern typical of crop species failed for nearly half of the species due to insensitivity to temperature change at T . For 32 fully characterized species, seed thermal parameters correlated strongly with the mean temperature of the wettest quarter of the seed collection sites. By projecting the mean temperature of the wettest quarter under two climate change scenarios, we predict under the least conservative scenario (+3.7°C) that 25% of cactus species will have reduced germination performance, whilst the remainder will have an efficiency gain, by the end of the 21st century.

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Section: Introductionmentioning

confidence: 99%

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Seal

Daws

Flores

et al. 2017

Global Change Biology

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“…Koch , Eurotia lanata (Pursh) Moq.) have been evaluated to assess seed germinability with various population‐based modelling approaches (Batlla & Benech‐Arnold, ; Steadman & Pritchard, ; Wang et al ., ; Chantre et al ., ; Bazin et al ., ; Orrù et al ., ; Porceddu et al ., ; Fernández‐Pascual et al ., ). For the specific case of B. arvensis , Chantre et al .…”

Section: Introductionmentioning

confidence: 99%

Soil nitrogen fertilisation as a maternal effect on Buglossoides arvensis seed germinability

2016

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Summary Different ecological strategies are developed by weed species to improve their fitness under unpredictable environmental conditions. Maternal effects are a way to enhance the performance of progeny. The external ecological environment of mother plants influences phenotypic traits of the progeny, such as seed germinability. Buglossoides arvensis is a facultative winter annual weed species present in cereal crops of the semiarid temperate region of Argentina. Recently, the intensification of agricultural systems has led to a significant increment of external inputs, such as nitrogen fertilisers. In this work, we aimed to determine the effect of different maternal nitrogen fertiliser levels on the germinability of two successive progenies (F1–F2). A population‐based model was used to estimate thermal time parameters. Our results indicated that under field conditions, nitrogen fertilisation produced an increment on the germinability of the progeny. Nitrogen supply promoted a widening of the permissive germination thermal range through an increment in the mean maximum germination temperature. However, different maternal fertilisation levels did not influence germination thermal time requirements either in F1 or F2 progenies. It might be inferred that a significant increment of nitrogen fertiliser supply could increase the probability of occurrence of very early emergence fluxes of B. arvensis. From a weed control perspective, the occurrence of early cohorts during summer may demand a redesign of control tactics, to minimise the potential economic and environmental impact of chemical interventions.

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“…Porceddu et al 2013;Santo et al 2014), which could be useful for in situ conservation actions, such as plant reintroduction or population reinforcement programs.…”

Section: Ex Situ Conservation Actionsmentioning

confidence: 99%

The Aichi Biodiversity Target 12 at regional level: an achievable goal?

et al. 2015

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The Aichi Biodiversity Target 12 aims to prevent the extinction risk of known threatened species and to improve their\ud conservation status by 2020. We present the integrated strategy implemented in the last 10 years for the keystone plant\ud species of Sardinia (Italy, W. Mediterranean Basin), which includes the following activities: conservation status assessment\ud (following the IUCN protocol), ex situ conservation, in situ monitoring and active protection measures. To date, an\ud average of 51.8% of keystone plant species have been subjected to the latter first three activities while, due to the higher\ud costs, only few active conservation measures have been carried out. Considering the activities realised since 2004, we\ud have also predicted the conservation effectiveness towards 2020 and have elaborated an index to evaluate it. Halfway\ud through the strategic plan, we argue that more efforts are needed to guarantee the effective conservation of all threatened\ud plants in Sardinia

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Thermal niche for in situ seed germination by Mediterranean mountain streams: model prediction and validation for Rhamnus persicifolia seeds

Cited by 42 publications

References 47 publications

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Soil nitrogen fertilisation as a maternal effect on Buglossoides arvensis seed germinability

The Aichi Biodiversity Target 12 at regional level: an achievable goal?

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