Drought and heat waves associated with climate change affect performance of the potato aphid Macrosiphum euphorbiae.

Abstract:

:The combined effect of drought and heat waves on insect-plant interactions is complex and not fully understood. Insects may indirectly benefit from water-deficit stress through increased plant nitrogen levels. Heat stress may have a direct negative effect, yet insect performance may be improved when day-time heat is followed by cooler night temperatures. We show that moderate water-deficit stress (25-30% pot capacity) and high day-night temperatures (30/20 °C) affected Macrosiphum euphorbiae on potato (Solanum tuberosum) differently than their interactions. Water stress lowered stomatal conductance, and both water and heat stress reduced leaf area. The effect of water stress on nymphal and adult survival depended on temperature. Water stress added to reduced nymphal survival at high but not current (25/15 °C) day-night temperatures. Adult survival at high temperatures was reduced only when combined with water stress. Water stress and high temperatures independently but not interactively reduced the number of daily offspring. Moderate water stress when combined with high temperatures had a negative bottom-up effect on aphid survival even though lower night temperatures aided in the recovery from direct heat stress. Our study illustrates the importance of combining multiple stressors to better understand their impact on insect-plant interactions in the context of climate change.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Beetge L,Krüger K

doi

10.1038/s41598-018-37493-8

subject

Has Abstract

pub_date

2019-03-06 00:00:00

pages

3645

issue

1

issn

2045-2322

pii

10.1038/s41598-018-37493-8

journal_volume

9

pub_type

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