Title: Large‐ and small‐seeded species have contrasting functional neighborhoods in a subtropical forest

Abstract

Abstract Forest community composition is the outcome of multiple forces, including those that increase taxonomic and functional divergence and those that promote convergence in traits. The mechanisms underlying these forces may not operate homogenously within communities; individuals of different species are never perfectly mixed, and thus, species tend to be surrounded and interact with different subsets of species. In fact, taxonomic and functional composition of neighborhoods of different focal species can be highly variable. Here, we examine whether mechanisms driving species‐level neighborhoods relate to intrinsic characteristics of focal species such as differences in life‐history and resource‐uptake strategies and in turn relate to species survival. We focus on two key characteristics: (1) seed mass, which defines a dominant axis of life‐history strategies related to stress tolerance, and (2) understory light preferences that sort species from light‐demanding pioneers to shade‐tolerant. We monitored seedling communities over 10 yr in Puerto Rico and calculated neighborhood trait dispersion in species‐level neighborhoods using seven functional traits. We examined whether species‐level characteristics, seed mass and preferred light conditions, influence patterns of functional dispersion in seedling neighborhoods using linear models. Then, we examined how species‐level functional neighborhoods impact seedling survival. We found that small‐ and large‐seeded species diverge inmore » the type of functional neighborhoods they associate with. Large‐seeded species associate with neighbors that are more similar than expected in leaf economic traits, but more different than expected in seed mass and leaf area traits, while the opposite was found for small‐seeded species. This variation in species functional neighborhood was important in determining seedling survival. In sum, our results suggest that divergent and convergent forces do not operate homogenously over entire communities. Their relative role changes in space, and on a species‐by‐species basis, probably with a deterministic foundation linked to traits such as seed mass.« less

Authors:

Umaña, María Natalia  ^[1];

• Search DOE PAGES for author "Umaña, María Natalia"
• Search DOE PAGES for ORCID "0000-0001-5876-7720"

Arellano, Gabriel  ^[2];

• Search DOE PAGES for author "Arellano, Gabriel"
• Search DOE PAGES for ORCID "0000-0003-3990-5344"

Forero‐Montaña, Jimena ^[3]; Nytch, Christopher J. ^[3]; Swenson, Nathan G. ^[4]; Thompson, Jill ^[5]; Uriarte, María ^[6]; Zimmerman, Jess K. ^[7]

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+ Show Author Affiliations

1. Department of Ecology and Evolutionary Biology University of Michigan Ann Arbor Michigan 48109 USA
2. Department of Ecology and Evolutionary Biology University of Michigan Ann Arbor Michigan 48109 USA, ForestGEO Smithsonian Tropical Research Institute Washington D.C. 20013 USA
3. Department of Biology University of Puerto Rico Río Piedras Puerto Rico 00931 USA
4. Department of Biology University of Maryland College Park Maryland 20742 USA
5. Centre for Ecology &, Hydrology Bush Estate Penicuik Midlothian EH26 0QB UK
6. Department of Ecology, Evolution&, Environmental Biology Columbia University New York New York 10027 USA
7. Department of Biology University of Puerto Rico Río Piedras Puerto Rico 00931 USA, Department of Environmental Science University of Puerto Rico Río Piedras Puerto Rico 00936 USA

Publication Date:

Fri Jan 24 00:00:00 EST 2020

Sponsoring Org.:

USDOE

OSTI Identifier:

1594216

Alternate Identifier(s):

OSTI ID: 1594217

Resource Type:

Published Article

Journal Name:

Ecosphere

Additional Journal Information:

Journal Name: Ecosphere Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 2150-8925

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

United States

Language:

English