Immediate and carry-over effects of insect outbreaks on vegetation growth in West Greenland assessed from cells to satellite

Angela Luisa Prendin, Marco Carrer, Mojtaba Karami, Jørgen Hollesen, Nanna Bjerregaard Pedersen, Mario Pividori, Urs A. Treier, Andreas Westergaard-Nielsen, Bo Elberling, Signe Normand

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Aim Tundra ecosystems are highly vulnerable to climate change, and climate?growth responses of Arctic shrubs are variable and altered by microsite environmental conditions and biotic factors. With warming and drought during the growing season, insect-driven defoliation is expected to increase in frequency and severity with potential broad-scale impacts on tundra ecosystem functioning. Here we provide the first broad-scale reconstruction of spatio-temporal dynamics of past insect outbreaks by assessing their effects on shrub growth along a typical Greenlandic fjord climate gradient from the inland ice to the sea. Location Nuuk Fjord (64°30?N/51°23?W) and adjacent areas, West Greenland. Taxa Great brocade (Eurois occulta L.) and grey willow (Salix glauca L.). Methods We combined dendro-anatomical and remote sensing analyses. Time series of ring width (RW) and wood-anatomical traits were obtained from chronologies of >40 years established from 153 individuals of S. glauca collected at nine sites. We detected anomalies in satellite-based Normalized Difference Vegetation Index (NDVI) related to defoliation and reconstructed past changes in photosynthetic activity across the region. Results We identified outbreaks as distinctive years with reduced RW, cell-wall thickness and vessel size, without being directly related to climate but matching with years of parallel reduction in NDVI. The two subsequent years after the defoliation showed a significant increase in RW. The reconstructed spatio-temporal dynamics of these events indicate substantial regional variation in outbreak intensity linked to the climate variability across the fjord system. Main conclusions Our results highlight the ability of S. glauca to cope with severe insect defoliation by changing carbon investment and xylem conductivity leading to high resilience and rapid recovery after the disturbance. Our multiproxy approach allows us to pinpoint biotic drivers of narrow ring formation and to provide new broad-scale insight on the C-budget and vegetation productivity of shrub communities in a widespread arctic ecosystem.
OriginalsprogEngelsk
TidsskriftJournal of Biogeography
Sider (fra-til)1-14
ISSN0305-0270
DOI
StatusUdgivet - 28 jun. 2019

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Prendin, Angela Luisa ; Carrer, Marco ; Karami, Mojtaba ; Hollesen, Jørgen ; Pedersen, Nanna Bjerregaard ; Pividori, Mario ; Treier, Urs A. ; Westergaard-Nielsen, Andreas ; Elberling, Bo ; Normand, Signe. / Immediate and carry-over effects of insect outbreaks on vegetation growth in West Greenland assessed from cells to satellite. I: Journal of Biogeography. 2019 ; s. 1-14.
@article{5b3f8cbd3db9405d91370ea7fe1014f7,
title = "Immediate and carry-over effects of insect outbreaks on vegetation growth in West Greenland assessed from cells to satellite",
abstract = "Aim Tundra ecosystems are highly vulnerable to climate change, and climate?growth responses of Arctic shrubs are variable and altered by microsite environmental conditions and biotic factors. With warming and drought during the growing season, insect-driven defoliation is expected to increase in frequency and severity with potential broad-scale impacts on tundra ecosystem functioning. Here we provide the first broad-scale reconstruction of spatio-temporal dynamics of past insect outbreaks by assessing their effects on shrub growth along a typical Greenlandic fjord climate gradient from the inland ice to the sea. Location Nuuk Fjord (64°30?N/51°23?W) and adjacent areas, West Greenland. Taxa Great brocade (Eurois occulta L.) and grey willow (Salix glauca L.). Methods We combined dendro-anatomical and remote sensing analyses. Time series of ring width (RW) and wood-anatomical traits were obtained from chronologies of >40 years established from 153 individuals of S. glauca collected at nine sites. We detected anomalies in satellite-based Normalized Difference Vegetation Index (NDVI) related to defoliation and reconstructed past changes in photosynthetic activity across the region. Results We identified outbreaks as distinctive years with reduced RW, cell-wall thickness and vessel size, without being directly related to climate but matching with years of parallel reduction in NDVI. The two subsequent years after the defoliation showed a significant increase in RW. The reconstructed spatio-temporal dynamics of these events indicate substantial regional variation in outbreak intensity linked to the climate variability across the fjord system. Main conclusions Our results highlight the ability of S. glauca to cope with severe insect defoliation by changing carbon investment and xylem conductivity leading to high resilience and rapid recovery after the disturbance. Our multiproxy approach allows us to pinpoint biotic drivers of narrow ring formation and to provide new broad-scale insight on the C-budget and vegetation productivity of shrub communities in a widespread arctic ecosystem.",
author = "Prendin, {Angela Luisa} and Marco Carrer and Mojtaba Karami and J{\o}rgen Hollesen and Pedersen, {Nanna Bjerregaard} and Mario Pividori and Treier, {Urs A.} and Andreas Westergaard-Nielsen and Bo Elberling and Signe Normand",
year = "2019",
month = "6",
day = "28",
doi = "10.1111/jbi.13644",
language = "English",
pages = "1--14",
journal = "Journal of Biogeography",
issn = "0305-0270",
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Prendin, AL, Carrer, M, Karami, M, Hollesen, J, Pedersen, NB, Pividori, M, Treier, UA, Westergaard-Nielsen, A, Elberling, B & Normand, S 2019, 'Immediate and carry-over effects of insect outbreaks on vegetation growth in West Greenland assessed from cells to satellite', Journal of Biogeography, s. 1-14. https://doi.org/10.1111/jbi.13644

Immediate and carry-over effects of insect outbreaks on vegetation growth in West Greenland assessed from cells to satellite. / Prendin, Angela Luisa; Carrer, Marco; Karami, Mojtaba; Hollesen, Jørgen; Pedersen, Nanna Bjerregaard; Pividori, Mario; Treier, Urs A. ; Westergaard-Nielsen, Andreas; Elberling, Bo; Normand, Signe.

I: Journal of Biogeography, 28.06.2019, s. 1-14.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Immediate and carry-over effects of insect outbreaks on vegetation growth in West Greenland assessed from cells to satellite

AU - Prendin, Angela Luisa

AU - Carrer, Marco

AU - Karami, Mojtaba

AU - Hollesen, Jørgen

AU - Pedersen, Nanna Bjerregaard

AU - Pividori, Mario

AU - Treier, Urs A.

AU - Westergaard-Nielsen, Andreas

AU - Elberling, Bo

AU - Normand, Signe

PY - 2019/6/28

Y1 - 2019/6/28

N2 - Aim Tundra ecosystems are highly vulnerable to climate change, and climate?growth responses of Arctic shrubs are variable and altered by microsite environmental conditions and biotic factors. With warming and drought during the growing season, insect-driven defoliation is expected to increase in frequency and severity with potential broad-scale impacts on tundra ecosystem functioning. Here we provide the first broad-scale reconstruction of spatio-temporal dynamics of past insect outbreaks by assessing their effects on shrub growth along a typical Greenlandic fjord climate gradient from the inland ice to the sea. Location Nuuk Fjord (64°30?N/51°23?W) and adjacent areas, West Greenland. Taxa Great brocade (Eurois occulta L.) and grey willow (Salix glauca L.). Methods We combined dendro-anatomical and remote sensing analyses. Time series of ring width (RW) and wood-anatomical traits were obtained from chronologies of >40 years established from 153 individuals of S. glauca collected at nine sites. We detected anomalies in satellite-based Normalized Difference Vegetation Index (NDVI) related to defoliation and reconstructed past changes in photosynthetic activity across the region. Results We identified outbreaks as distinctive years with reduced RW, cell-wall thickness and vessel size, without being directly related to climate but matching with years of parallel reduction in NDVI. The two subsequent years after the defoliation showed a significant increase in RW. The reconstructed spatio-temporal dynamics of these events indicate substantial regional variation in outbreak intensity linked to the climate variability across the fjord system. Main conclusions Our results highlight the ability of S. glauca to cope with severe insect defoliation by changing carbon investment and xylem conductivity leading to high resilience and rapid recovery after the disturbance. Our multiproxy approach allows us to pinpoint biotic drivers of narrow ring formation and to provide new broad-scale insight on the C-budget and vegetation productivity of shrub communities in a widespread arctic ecosystem.

AB - Aim Tundra ecosystems are highly vulnerable to climate change, and climate?growth responses of Arctic shrubs are variable and altered by microsite environmental conditions and biotic factors. With warming and drought during the growing season, insect-driven defoliation is expected to increase in frequency and severity with potential broad-scale impacts on tundra ecosystem functioning. Here we provide the first broad-scale reconstruction of spatio-temporal dynamics of past insect outbreaks by assessing their effects on shrub growth along a typical Greenlandic fjord climate gradient from the inland ice to the sea. Location Nuuk Fjord (64°30?N/51°23?W) and adjacent areas, West Greenland. Taxa Great brocade (Eurois occulta L.) and grey willow (Salix glauca L.). Methods We combined dendro-anatomical and remote sensing analyses. Time series of ring width (RW) and wood-anatomical traits were obtained from chronologies of >40 years established from 153 individuals of S. glauca collected at nine sites. We detected anomalies in satellite-based Normalized Difference Vegetation Index (NDVI) related to defoliation and reconstructed past changes in photosynthetic activity across the region. Results We identified outbreaks as distinctive years with reduced RW, cell-wall thickness and vessel size, without being directly related to climate but matching with years of parallel reduction in NDVI. The two subsequent years after the defoliation showed a significant increase in RW. The reconstructed spatio-temporal dynamics of these events indicate substantial regional variation in outbreak intensity linked to the climate variability across the fjord system. Main conclusions Our results highlight the ability of S. glauca to cope with severe insect defoliation by changing carbon investment and xylem conductivity leading to high resilience and rapid recovery after the disturbance. Our multiproxy approach allows us to pinpoint biotic drivers of narrow ring formation and to provide new broad-scale insight on the C-budget and vegetation productivity of shrub communities in a widespread arctic ecosystem.

U2 - 10.1111/jbi.13644

DO - 10.1111/jbi.13644

M3 - Journal article

SP - 1

EP - 14

JO - Journal of Biogeography

JF - Journal of Biogeography

SN - 0305-0270

ER -