Larval crowding during an insect outbreak reduces herbivory pressure on preferred shrubs in a warmer environment

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Larval crowding during an insect outbreak reduces herbivory pressure on preferred shrubs in a warmer environment. / Gamarra, Javier ; Callaghan, Terry V.; Bylund, Helena; Gwynn-Jones, Dylan.

In: Agricultural and Forest Meteorology, Vol. 263, 15.12.2018, p. 180-187.

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Gamarra, Javier ; Callaghan, Terry V. ; Bylund, Helena ; Gwynn-Jones, Dylan. / Larval crowding during an insect outbreak reduces herbivory pressure on preferred shrubs in a warmer environment. In: Agricultural and Forest Meteorology. 2018 ; Vol. 263. pp. 180-187.

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@article{5e868b854a0042e1969c1396de3dacef,
title = "Larval crowding during an insect outbreak reduces herbivory pressure on preferred shrubs in a warmer environment",
abstract = "With warming climate many species are predicted to shift their distributions toward the poles. However, climate change models developed to predict species distributions do not always incorporate interactions between them. The northerly shift of the boreal forest and associated dwarf shrub communities will be directly affected by warming. But warming will also indirectly affect plant communities via impacts on the intensity and frequency of associated insect outbreaks. We present a general model exploring plant host herbivory in response to the balance between insect crowding, host consumption and climate. We examined how these factors dictate the feeding preference of Epirrita autumnata larvae during an outbreak on dwarf shrub vegetation in Sub-arctic Fennoscandia. Data were collected from an outdoor experiment investigating future climate change scenarios (elevated CO2 and temperature) on the dwarf shrub community that included deciduous (Vaccinium myrtillus) and evergreen species (V. vitis-idaea and Empetrum nigrum). We observed that larval crowding was independent of treatment under outbreak conditions. We also tested and confirmed model predictions that larvae would prefer monospecific stands of either deciduous shrubs or its evergreen competitors. For current climate conditions, larvae had a preference to consume more deciduous shrubs in mixed stands. However, at elevated temperature bilberry consumption and herbivore pressure was lower, particularly in mixed stands. Our results show that during future warming, E. autumnata herbivory could promote the success of thermophile deciduous species and possible northward migration. Insect behaviour and preferences should therefore be considered when predicting future vegetation movements responding to warming",
keywords = "climate change, gompertz, herbivore pressure, host plant preference, insect outbreaks, sub-arctic",
author = "Javier Gamarra and Callaghan, {Terry V.} and Helena Bylund and Dylan Gwynn-Jones",
year = "2018",
month = dec,
day = "15",
doi = "10.1016/j.agrformet.2018.08.016",
language = "English",
volume = "263",
pages = "180--187",
journal = "Agricultural and Forest Meteorology",
issn = "0168-1923",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Larval crowding during an insect outbreak reduces herbivory pressure on preferred shrubs in a warmer environment

AU - Gamarra, Javier

AU - Callaghan, Terry V.

AU - Bylund, Helena

AU - Gwynn-Jones, Dylan

PY - 2018/12/15

Y1 - 2018/12/15

N2 - With warming climate many species are predicted to shift their distributions toward the poles. However, climate change models developed to predict species distributions do not always incorporate interactions between them. The northerly shift of the boreal forest and associated dwarf shrub communities will be directly affected by warming. But warming will also indirectly affect plant communities via impacts on the intensity and frequency of associated insect outbreaks. We present a general model exploring plant host herbivory in response to the balance between insect crowding, host consumption and climate. We examined how these factors dictate the feeding preference of Epirrita autumnata larvae during an outbreak on dwarf shrub vegetation in Sub-arctic Fennoscandia. Data were collected from an outdoor experiment investigating future climate change scenarios (elevated CO2 and temperature) on the dwarf shrub community that included deciduous (Vaccinium myrtillus) and evergreen species (V. vitis-idaea and Empetrum nigrum). We observed that larval crowding was independent of treatment under outbreak conditions. We also tested and confirmed model predictions that larvae would prefer monospecific stands of either deciduous shrubs or its evergreen competitors. For current climate conditions, larvae had a preference to consume more deciduous shrubs in mixed stands. However, at elevated temperature bilberry consumption and herbivore pressure was lower, particularly in mixed stands. Our results show that during future warming, E. autumnata herbivory could promote the success of thermophile deciduous species and possible northward migration. Insect behaviour and preferences should therefore be considered when predicting future vegetation movements responding to warming

AB - With warming climate many species are predicted to shift their distributions toward the poles. However, climate change models developed to predict species distributions do not always incorporate interactions between them. The northerly shift of the boreal forest and associated dwarf shrub communities will be directly affected by warming. But warming will also indirectly affect plant communities via impacts on the intensity and frequency of associated insect outbreaks. We present a general model exploring plant host herbivory in response to the balance between insect crowding, host consumption and climate. We examined how these factors dictate the feeding preference of Epirrita autumnata larvae during an outbreak on dwarf shrub vegetation in Sub-arctic Fennoscandia. Data were collected from an outdoor experiment investigating future climate change scenarios (elevated CO2 and temperature) on the dwarf shrub community that included deciduous (Vaccinium myrtillus) and evergreen species (V. vitis-idaea and Empetrum nigrum). We observed that larval crowding was independent of treatment under outbreak conditions. We also tested and confirmed model predictions that larvae would prefer monospecific stands of either deciduous shrubs or its evergreen competitors. For current climate conditions, larvae had a preference to consume more deciduous shrubs in mixed stands. However, at elevated temperature bilberry consumption and herbivore pressure was lower, particularly in mixed stands. Our results show that during future warming, E. autumnata herbivory could promote the success of thermophile deciduous species and possible northward migration. Insect behaviour and preferences should therefore be considered when predicting future vegetation movements responding to warming

KW - climate change

KW - gompertz

KW - herbivore pressure

KW - host plant preference

KW - insect outbreaks

KW - sub-arctic

U2 - 10.1016/j.agrformet.2018.08.016

DO - 10.1016/j.agrformet.2018.08.016

M3 - Article

VL - 263

SP - 180

EP - 187

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

ER -

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