Pollen season trends as markers of climate change impact: Betula, Quercus and Poaceae

Adams‐Groom, Beverley; Selby, Katherine; Derrett, Sally; Frisk, Carl A.; Pashley, Catherine H.; Satchwell, Jack; King, Dale; McKenzie, Gaynor; Neilson, Roy

doi:10.1016/j.scitotenv.2022.154882

Cited by 27 publications

(15 citation statements)

References 46 publications

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“…Redundancy analysis provides a useful indication of possible associations between environmental factors and species. Here air temperature and wind speed were significant to bioaerosol composition, with several taxa, such as grasses, showing positive associations with air temperature, which is typical of their pollen seasonality (Adams-Groom et al, 2022). Tree species typically flower during spring and summer (Meng et al, 2022) and would be expected to be missed by the late summer-autumn sampling here, however their presence within the top twenty relatively abundant genera, suggests an alternative source of bioaerosol than pollen.…”

Section: Discussionmentioning

confidence: 67%

Storms facilitate airborne DNA from leaf fragments outside the main tree pollen season

Hanson,

Petch,

Adams-Groom

et al. 2024

Aerobiologia

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Bioaerosols are useful indicators of plant phenology and can demonstrate the impacts of climate change on both local and regional scales (e.g. pollen monitoring/flowering phenology). Analysing bioaerosols with eDNA approaches are becoming more popular to quantify the diversity of airborne plant environmental DNA (eDNA) and flowering season of plants and trees. Leaf abscission from broadleaved trees and other perennial species can also indicate the status of plant health in response to climate. This happens primarily during autumn in response to seasonal growth conditions and environmental factors, such as changing photoperiod and reduced temperatures. During this period biological material is released in larger quantities to the environment. Here, rural bioaerosol composition during late summer and autumn was captured by MiSEQ sequencing of the rRNA internal transcribed spacer 2 (ITS2) region, a common marker for taxonomic variation. Meteorological parameters were recorded from a proximal weather station. The composition of atmospheric taxa demonstrated that deciduous tree DNA forms part of the bioaerosol community during autumn and, for several common broadleaved tree species, atmospheric DNA abundance correlated to high wind events. This suggests that both flowering and autumn storms cause bioaerosols from deciduous trees that can be detected with eDNA approaches. This is an aspect that must be considered when eDNA methods are used to analyse either pollen or other fragments from trees.

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Section: Discussionmentioning

confidence: 67%

Storms facilitate airborne DNA from leaf fragments outside the main tree pollen season

Hanson,

Petch,

Adams-Groom

et al. 2024

Aerobiologia

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“…All these phenological changes are due to buds' deacclimation processes, which are increasingly being detected due to climate change in oaks and many other temperate tree species (Arora and Taulavuori, 2016;Vyse et al, 2019;Vogel, 2022). Recent climatic change is leading to changes in the timing and intensity of the pollen season in members of this genus (López-Orozco et al, 2021;Adams-Groom et al, 2022). Other effects on flowering strongly related to climate change, but not necessarily negative are, for example, the triggering of a secondary Quercus flowering in autumn, as found in some species in the Iberian Peninsula after dry summers and warm autumns (García-Mozo et al, 2022).…”

Section: Reproductionmentioning

confidence: 99%

The potential impacts of climate change on ex situ conservation options for recalcitrant-seeded species

Fernández

León‐Lobos

Contreras

et al. 2023

Front. For. Glob. Change

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Recalcitrant seeds are characterized by desiccation and freezing sensitivity, and short storage longevity. These physiological attributes obviate their ex situ conservation in conventional seed banks, where seeds are stored dry at sub-zero temperatures (typically, 15% relative humidity and –20°C) for extended periods of time. Propagation of plants for field collections (e.g., botanical gardens, nurseries, and arboretums) is a valuable ex situ conservation option. However, these collections are relatively costly, require high maintenance, preserve limited genetic diversity and/or are directly exposed to biotic (e.g., pests) and abiotic (e.g., climatic) threats. Therefore, recalcitrant-seeded (RS) species are dependent on cryopreservation for their safe and long-term ex situ conservation. Different explant sources such as whole seeds, zygotic embryos, dormant buds, shoot tips, and pollen, can be used for plant propagation of RS species in field collections as well as for their cryopreservation. The success of the propagation or the cryopreservation of these explants often depends on their developmental status, vigor, and/or tolerance to desiccation and chilling/freezing. These attributes are modulated by the environment where the donor plant grows and we hypothesize that climate change, by affecting these biological attributes, would impact the success of explant propagation and cryopreservation. To support this hypothesis, we have reviewed how temperature changes and drought, the two main climate change scenarios, affect the main biological attributes that are directly involved in the success of ex situ conservation of tropical and temperate RS species. In general, increases in temperature and drought will negatively affect plant development in field collections and the quality of the explants used in cryopreservation. Consequently, field collections of RS species may need to be moved to more suitable places (e.g., higher latitudes/altitudes). Additionally, we may find a reduction in the success of cryopreservation of RS species germplasm directly harvested from field collections. However, we cannot always generalize these effects for all species since they often depend on the origin of the species (e.g., tropical and temperate species tend to respond to climate change differently), the genotype, the adaptive genetic potential of each population, and the severity of the environmental change. On the other hand, the increase in temperatures and water stress in donor plants at high-latitude areas and also some tropical environments may favor the production of seeds and seedlings better adapted to drying, and hence, increase the success of plant propagation and zygotic embryo cryopreservation.

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“…The trend in the northern hemisphere seems to indicate an increase in the amount of pollen from woody species, while the amount of pollen from herbaceous species shows a decreasing trend. In addition, significant changes in the duration of the main pollen season have been reported, in which the start, peak and end dates show temporal variations (García-Mozo et al 2014;Bruffaerts et al 2018;Hoebeke et al 2018;Ruiz-Valenzuela & Aguilera, 2018;Piotrowska-Weryszko et al 2021;Rojo et al 2021;Adams-Groom et al 2022). However, it should be noted that these variations seem to respond to local climatic conditions, with different results being 3 obtained according to the region or country where the study was located.…”

Section: Introductionmentioning

confidence: 99%

Phenological variations of anemophilous species in an Atlantic-influenced Mediterranean environment: a long term study

Montiel,

Hidalgo,

Adame

et al. 2023

Preprint

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Numerous studies have shown that climate change is having an impact on the pollen production and emission of various anemophilous plant species, both herbaceous and woody. This study attempts to elucidate whether this trend, highly marked in Europe, is also occurring with species in the surrounding of the city of Huelva (south-western Spain), an area with a milder climate than the Mediterranean littoral due to the influence of the Atlantic Ocean. For this purpose, the factors influencing the main pollen season were studied for all local taxa with an occurrence of more than 1 % of the total, over the period 1993-2022, using an airborne pollen trap to determine the pollen concentration. A trend analysis of meteorological variables potentially affected by climate change, such as temperature (maximum, minimum and average), precipitation and the number of hours of insolation per day was also carried out. Our results indicate that there is significant variation between herbaceous and woody taxa. Woody taxa show a trend towards increased pollen production, as noted in other areas in Europe, associated to temperature in previous seasons. By contrast, herbaceous taxa, are more dependent on meteorological variables, showing an acceleration in the end date of the main pollen season correlated with temperature and insolation. In conclusion, herbaceous taxa are the more sensitive group to climate alterations, and may be an immediate indicator of the consequences of climate change on biodiversity in this representative area of the Atlantic-influenced Mediterranean region.Our results indicate that there is significant variation between herbaceous and woody taxa. Woody taxa show a trend towards increased pollen production, as noted in other areas in Europe, associated to temperature in previous seasons. By contrast, herbaceous taxa, are more dependent on meteorological variables, showing an acceleration in the end date of the main pollen season correlated with temperature and insolation. In conclusion, herbaceous taxa are the more sensitive group to climate alterations, and may be an immediate indicator of the consequences of climate change on biodiversity in this representative area of the Atlantic-influenced Mediterranean region.

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Pollen season trends as markers of climate change impact: Betula, Quercus and Poaceae

Cited by 27 publications

References 46 publications

Storms facilitate airborne DNA from leaf fragments outside the main tree pollen season

Storms facilitate airborne DNA from leaf fragments outside the main tree pollen season

The potential impacts of climate change on ex situ conservation options for recalcitrant-seeded species

Phenological variations of anemophilous species in an Atlantic-influenced Mediterranean environment: a long term study

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