Impacts of drought on pollination of<i>Trigonella moabitica</i>(Fabaceae) via bee visitations

Al-Ghzawi, Abd Al-Majeed; Zaitoun, Shahera; Gosheh, Hani; Alqudah, Ahmad M.

doi:10.1080/03650340902821666

Cited by 32 publications

(31 citation statements)

References 48 publications

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“…For both E. plantagineum and E. vulgare, water stress resulted in a decrease in the total number of flowers, and consequently in the overall floral display, with a greater reduction in the annual E. plantagineum. Similar results under water stress conditions have been reported in previous studies (Al-Ghzawi, Zaitoun, & Gosheh, 2009;Phillips et al, 2018). On the contrary, Mertensia ciliata maintained its floral display under water stress because this species is able to use stored resources to restart its spring growth; therefore, the effects of water stress are only felt after several consecutive years of drought (Gallagher & Campbell, 2017).…”

Section: Discussionsupporting

confidence: 88%

Species‐specific responses to combined water stress and increasing temperatures in two bee‐pollinated congeners (Echium, Boraginaceae)

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Marée

Hugon

et al. 2020

Ecology and Evolution

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Water stress and increasing temperatures are two main constraints faced by plants in the context of climate change. These constraints affect plant physiology and morphology, including phenology, floral traits, and nectar rewards, thus altering plant–pollinator interactions. We compared the abiotic stress responses of two bee‐pollinated Boraginaceae species, Echium plantagineum, an annual, and Echium vulgare, a biennial. Plants were grown for 5 weeks during their flowering period under two watering regimes (well‐watered and water‐stressed) and three temperature regimes (21, 24, 27°C). We measured physiological traits linked to photosynthesis (chlorophyll content, stomatal conductance, and water use efficiency), and vegetative (leaf number and growth rate) and floral (e.g., flower number, phenology, floral morphology, and nectar production) traits. The physiological and morphological traits of both species were affected by the water and temperature stresses, although the effects were greater for the annual species. Both stresses negatively affected floral traits, accelerating flower phenology, decreasing flower size, and, for the annual species, decreasing nectar rewards. In both species, the number of flowers was reduced by 22%–45% under water stress, limiting the total amount of floral rewards. Under water stress and increasing temperatures, which mimic the effects of climate change, floral traits and resources of bee‐pollinated species are affected and can lead to disruptions of pollination and reproductive success.

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Section: Discussionsupporting

confidence: 88%

Species‐specific responses to combined water stress and increasing temperatures in two bee‐pollinated congeners (Echium, Boraginaceae)

Descamps

Marée

Hugon

et al. 2020

Ecology and Evolution

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“…Other studies have assessed the impacts of drought on floral resources using laboratory experiments (Villarreal & Freeman, 1990) and field experiments in arid or semiarid regions (Al-Ghzawi et al, 2009;Takkis et al, 2015). The advantages of our study are that it involves intact experimental plant communities based in situ in a temperate region.…”

Section: Discussionmentioning

confidence: 99%

“…Broadly, a reduction in water availability will affect photosynthetic rate (Pinheiro & Chaves, ), leading to fewer resources available to plants for investment into reproduction and flowers. Drought has been shown to reduce flower size (Halpern, Adler, & Wink, ), the number of flowers per plant (Burkle & Runyon, ), result in flowers that produce less pollen (Waser & Price, ) and a lower proportion of viable pollen grains (Al‐Ghzawi, Zaitoun, Gosheh, & Alqudah, ), and affect floral volatiles, which can influence the attractiveness of flowers to pollinators (Burkle & Runyon, ). In general, water availability has been found to affect nectar in terms of volume (Carroll, Pallardy, & Galen, ; Gallagher & Campbell, ; Halpern et al., ; Lee & Felker, ; Villarreal & Freeman, ) and sometimes also sugar concentration (Waser & Price, ; Wyatt, Broyles, & Derda, ; Zimmerman & Pyke, ).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, changes in nectar will affect the energy intake rate of pollinators (Schweiger et al, 2010), which is optimized at intermediate sugar concentrations (Borrell, 2007). Effects of drought on other floral traits have been shown to result in fewer visits by bees (Al-Ghzawi et al, 2009;Gallagher & Campbell, 2017), although Burkle and Runyon (2016) found that the response of other pollinator groups was both plant and pollinator species-specific, with visitation rate increasing in some circumstances. More broadly, changes in the overall availability of floral resources will affect pollinators at the population level (Baude et al, 2016;Carvell et al, 2006Carvell et al, , 2017Roulston & Goodell, 2011).…”

mentioning

confidence: 99%

“…Existing studies of the response of floral resources and pollinators to drought have commonly been conducted on plants of arid and semiarid regions (Al-Ghzawi et al, 2009;Takkis, Tscheulin, Tsalkatis, & Petanidou, 2015), where drought events are relatively common, or in the laboratory (Villarreal & Freeman, 1990). There are few such experiments in temperate regions where drought is expected to increase in frequency and severity due to climate change (Dai, 2013;IPCC, 2014).…”

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Drought reduces floral resources for pollinators

Phillips

Shaw

Holland

et al. 2018

Global Change Biology

154

121

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Climate change is predicted to result in increased occurrence and intensity of drought in many regions worldwide. By increasing plant physiological stress, drought is likely to affect the floral resources (flowers, nectar and pollen) that are available to pollinators. However, little is known about impacts of drought at the community level, nor whether plant community functional composition influences these impacts. To address these knowledge gaps, we investigated the impacts of drought on floral resources in calcareous grassland. Drought was simulated using rain shelters and the impacts were explored at multiple scales and on four different experimental plant communities varying in functional trait composition. First, we investigated the effects of drought on nectar production of three common wildflower species (Lathyrus pratensis, Onobrychis viciifolia and Prunella vulgaris). In the drought treatment, L. pratensis and P. vulgaris had a lower proportion of flowers containing nectar and O. viciifolia had fewer flowers per raceme. Second, we measured the effects of drought on the diversity and abundance of floral resources across plant communities. Drought reduced the abundance of floral units for all plant communities, irrespective of functional composition, and reduced floral species richness for two of the communities. Functional diversity did not confer greater resistance to drought in terms of maintaining floral resources, probably because the effects of drought were ubiquitous across component plant communities. The findings indicate that drought has a substantial impact on the availability of floral resources in calcareous grassland, which will have consequences for pollinator behaviour and populations.

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