Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada
Aim : Altitudinal and latitudinal treeline ecotones have not consistently responded to climate warming the in direction and/or magnitude as predicted by climate alone, suggesting that non-climatic mechanisms (e.g., biotic interactions) are also mediating treeline range dynamics. Through a collaborat...
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ftzenodo:oai:zenodo.org:6685209 2024-09-15T18:20:15+00:00 Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada Brehaut, Lucas Goodwin, Katie Reid, Kirsten Crofts, Anna Danby, Ryan Mamet, Steven Brown, Carissa 2022-10-31 https://doi.org/10.5281/zenodo.6685209 unknown Zenodo https://doi.org/10.5061/dryad.79cnp5hz3 https://zenodo.org/communities/dryad https://doi.org/10.5281/zenodo.6685208 https://doi.org/10.5281/zenodo.6685209 oai:zenodo.org:6685209 info:eu-repo/semantics/openAccess GNU General Public License v1.0 or later https://www.gnu.org/licenses/old-licenses/gpl-1.0-standalone.html boreal forest black spruce white spruce insect granivory reproductive potential Seed availability seed predation Subarctic info:eu-repo/semantics/other 2022 ftzenodo https://doi.org/10.5281/zenodo.668520910.5061/dryad.79cnp5hz310.5281/zenodo.6685208 2024-07-26T06:32:06Z Aim : Altitudinal and latitudinal treeline ecotones have not consistently responded to climate warming the in direction and/or magnitude as predicted by climate alone, suggesting that non-climatic mechanisms (e.g., biotic interactions) are also mediating treeline range dynamics. Through a collaborative research approach, we assessed environmental conditions associated with insect cone granivory and how this biotic interaction may govern the reproductive potential, and therefore range dynamics, of spruce-dominated treelines across northern Canada. Location : Ten boreal forest treelines, tundra and alpine, from Yukon to Newfoundland and Labrador, Canada Taxa : White spruce ( Picea glauca (Moench) Voss), Black spruce ( Picea mariana (Mill.) B.S.P.), Strobilomyia spp., Megastigmus spp. Methods : Treeline sites were assessed for presence and magnitude of pre-seed dispersal granivory by insects, and viability of available seed was determined. We quantified stand density metrics, organic layer depth, and understory vegetation composition at each location and, subsequently, incorporated those variables into generalized linear mixed models to establish predictors of granivory magnitude and viability of available seed. Results : Our findings reveal the widespread presence of insect granivory across sites, however, site-specific patterns of granivory were associated with increased moss cover and decreased shrub cover and stand density. While all black-spruce-dominated sites exhibited seed viability rates greater than 50%, the number of seeds produced per cone varied, suggesting that within-site abiotic conditions and biotic interaction pressures limit successful colonization of novel environments in advance of seed dispersal. Main Conclusions : Results from the modelled relationships between cone granivory, seed viability, and environmental conditions represent an essential step toward generalizing how and when biotic interactions across subarctic treelines influence boreal tree range dynamics before seed dispersal. ... Other/Unknown Material Newfoundland Subarctic Tundra Yukon Zenodo |
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op_collection_id |
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boreal forest black spruce white spruce insect granivory reproductive potential Seed availability seed predation Subarctic |
spellingShingle |
boreal forest black spruce white spruce insect granivory reproductive potential Seed availability seed predation Subarctic Brehaut, Lucas Goodwin, Katie Reid, Kirsten Crofts, Anna Danby, Ryan Mamet, Steven Brown, Carissa Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada |
topic_facet |
boreal forest black spruce white spruce insect granivory reproductive potential Seed availability seed predation Subarctic |
description |
Aim : Altitudinal and latitudinal treeline ecotones have not consistently responded to climate warming the in direction and/or magnitude as predicted by climate alone, suggesting that non-climatic mechanisms (e.g., biotic interactions) are also mediating treeline range dynamics. Through a collaborative research approach, we assessed environmental conditions associated with insect cone granivory and how this biotic interaction may govern the reproductive potential, and therefore range dynamics, of spruce-dominated treelines across northern Canada. Location : Ten boreal forest treelines, tundra and alpine, from Yukon to Newfoundland and Labrador, Canada Taxa : White spruce ( Picea glauca (Moench) Voss), Black spruce ( Picea mariana (Mill.) B.S.P.), Strobilomyia spp., Megastigmus spp. Methods : Treeline sites were assessed for presence and magnitude of pre-seed dispersal granivory by insects, and viability of available seed was determined. We quantified stand density metrics, organic layer depth, and understory vegetation composition at each location and, subsequently, incorporated those variables into generalized linear mixed models to establish predictors of granivory magnitude and viability of available seed. Results : Our findings reveal the widespread presence of insect granivory across sites, however, site-specific patterns of granivory were associated with increased moss cover and decreased shrub cover and stand density. While all black-spruce-dominated sites exhibited seed viability rates greater than 50%, the number of seeds produced per cone varied, suggesting that within-site abiotic conditions and biotic interaction pressures limit successful colonization of novel environments in advance of seed dispersal. Main Conclusions : Results from the modelled relationships between cone granivory, seed viability, and environmental conditions represent an essential step toward generalizing how and when biotic interactions across subarctic treelines influence boreal tree range dynamics before seed dispersal. ... |
format |
Other/Unknown Material |
author |
Brehaut, Lucas Goodwin, Katie Reid, Kirsten Crofts, Anna Danby, Ryan Mamet, Steven Brown, Carissa |
author_facet |
Brehaut, Lucas Goodwin, Katie Reid, Kirsten Crofts, Anna Danby, Ryan Mamet, Steven Brown, Carissa |
author_sort |
Brehaut, Lucas |
title |
Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada |
title_short |
Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada |
title_full |
Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada |
title_fullStr |
Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada |
title_full_unstemmed |
Insect seed and cone predation reduces reproductive potential of treeline conifers across northern Canada |
title_sort |
insect seed and cone predation reduces reproductive potential of treeline conifers across northern canada |
publisher |
Zenodo |
publishDate |
2022 |
url |
https://doi.org/10.5281/zenodo.6685209 |
genre |
Newfoundland Subarctic Tundra Yukon |
genre_facet |
Newfoundland Subarctic Tundra Yukon |
op_relation |
https://doi.org/10.5061/dryad.79cnp5hz3 https://zenodo.org/communities/dryad https://doi.org/10.5281/zenodo.6685208 https://doi.org/10.5281/zenodo.6685209 oai:zenodo.org:6685209 |
op_rights |
info:eu-repo/semantics/openAccess GNU General Public License v1.0 or later https://www.gnu.org/licenses/old-licenses/gpl-1.0-standalone.html |
op_doi |
https://doi.org/10.5281/zenodo.668520910.5061/dryad.79cnp5hz310.5281/zenodo.6685208 |
_version_ |
1810458620820717568 |