Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.

Disentangling the influence of environmental drivers on community assembly is important to understand how multiple processes influence biodiversity patterns and can inform understanding of ecological responses to climate change. Phylogenetic Community Structure (PCS) is increasingly used in communit...

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Autores principales:	Kavya Pradhan, Diego Nieto-Lugilde, Matthew C Fitzpatrick
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0e90de6cfb334f6a9278088084d4719a
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spelling	oai:doaj.org-article:0e90de6cfb334f6a9278088084d4719a2021-12-02T20:05:10ZRelationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.1932-620310.1371/journal.pone.0240957https://doaj.org/article/0e90de6cfb334f6a9278088084d4719a2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0240957https://doaj.org/toc/1932-6203Disentangling the influence of environmental drivers on community assembly is important to understand how multiple processes influence biodiversity patterns and can inform understanding of ecological responses to climate change. Phylogenetic Community Structure (PCS) is increasingly used in community assembly studies to incorporate evolutionary perspectives and as a proxy for trait (dis)similarity within communities. Studies often assume a stationary relationship between PCS and climate, though few studies have tested this assumption over long time periods with concurrent community data. We estimated two PCS metrics-Nearest Taxon Index (NTI) and Net Relatedness index (NRI)-of fossil pollen assemblages of Angiosperms in eastern North America over the last 21 ka BP at 1 ka intervals. We analyzed spatiotemporal relationships between PCS and seven climate variables, evaluated the potential impact of deglaciation on PCS, and tested for the stability of climate-PCS relationships through time. The broad scale geographic patterns of PCS remained largely stable across time, with overdispersion tending to be most prominent in the central and southern portion of the study area and clustering dominating at the longitudinal extremes. Most importantly, we found that significant relationships between climate variables and PCS (slope) were not constant as climate changed during the last deglaciation and new ice-free regions were colonized. We also found weak, but significant relationships between both PCS metrics (i.e., NTI and NRI) and climate and time-since-deglaciation that also varied through time. Overall, our results suggest that (1) PCS of fossil Angiosperm assemblages during the last 21ka BP have had largely constant spatial patterns, but (2) temporal variability in the relationships between PCS and climate brings into question their usefulness in predictive modeling of community assembly.Kavya PradhanDiego Nieto-LugildeMatthew C FitzpatrickPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0240957 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kavya Pradhan Diego Nieto-Lugilde Matthew C Fitzpatrick Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
description	Disentangling the influence of environmental drivers on community assembly is important to understand how multiple processes influence biodiversity patterns and can inform understanding of ecological responses to climate change. Phylogenetic Community Structure (PCS) is increasingly used in community assembly studies to incorporate evolutionary perspectives and as a proxy for trait (dis)similarity within communities. Studies often assume a stationary relationship between PCS and climate, though few studies have tested this assumption over long time periods with concurrent community data. We estimated two PCS metrics-Nearest Taxon Index (NTI) and Net Relatedness index (NRI)-of fossil pollen assemblages of Angiosperms in eastern North America over the last 21 ka BP at 1 ka intervals. We analyzed spatiotemporal relationships between PCS and seven climate variables, evaluated the potential impact of deglaciation on PCS, and tested for the stability of climate-PCS relationships through time. The broad scale geographic patterns of PCS remained largely stable across time, with overdispersion tending to be most prominent in the central and southern portion of the study area and clustering dominating at the longitudinal extremes. Most importantly, we found that significant relationships between climate variables and PCS (slope) were not constant as climate changed during the last deglaciation and new ice-free regions were colonized. We also found weak, but significant relationships between both PCS metrics (i.e., NTI and NRI) and climate and time-since-deglaciation that also varied through time. Overall, our results suggest that (1) PCS of fossil Angiosperm assemblages during the last 21ka BP have had largely constant spatial patterns, but (2) temporal variability in the relationships between PCS and climate brings into question their usefulness in predictive modeling of community assembly.
format	article
author	Kavya Pradhan Diego Nieto-Lugilde Matthew C Fitzpatrick
author_facet	Kavya Pradhan Diego Nieto-Lugilde Matthew C Fitzpatrick
author_sort	Kavya Pradhan
title	Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
title_short	Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
title_full	Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
title_fullStr	Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
title_full_unstemmed	Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
title_sort	relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/0e90de6cfb334f6a9278088084d4719a
work_keys_str_mv	AT kavyapradhan relationshipsbetweenclimateandphylogeneticcommunitystructureoffossilpollenassemblagesarenotconstantduringthelastdeglaciation AT diegonietolugilde relationshipsbetweenclimateandphylogeneticcommunitystructureoffossilpollenassemblagesarenotconstantduringthelastdeglaciation AT matthewcfitzpatrick relationshipsbetweenclimateandphylogeneticcommunitystructureoffossilpollenassemblagesarenotconstantduringthelastdeglaciation
_version_	1718375465685614592

Relationships between climate and phylogenetic community structure of fossil pollen assemblages are not constant during the last deglaciation.

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