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Opposing effects of floral visitors and soil conditions on the determinants of competitive outcomes maintain species diversity in heterogeneous landscapes

Jose B. Lanuza, Ignasi Bartomeus, Oscar Godoy
doi: https://doi.org/10.1101/170423
Jose B. Lanuza
1School of Environmental and Rural Science, University of New England, Armidale, 2350, NSW Australia
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Ignasi Bartomeus
2Estacion Biologica de Donana (EBD-CSIC), C/Americo Vespucio 26, E-41092 Sevilla, Spain.
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Oscar Godoy
3Instituto de Recursos Naturales y de Agrobiología de Sevilla (IRNAS-CSIC), Avda. Reina Mercedes 10, E-41012 Sevilla, Spain
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  • For correspondence: ogodoy@irnas.csic.es
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Abstract

Theory argues that both soil conditions and aboveground trophic interactions are equally important for determining plant species diversity. However, it remains unexplored how they modify the niche differences that stabilise species coexistence and the average fitness differences driving competitive dominance. We conducted a field study in Mediterranean annual grasslands to parameterise population models of six competing plant species. Spatially explicit floral visitor assemblages and soil salinity variation were characterized for each species. Both floral visitors and soil salinity modified species population dynamics via direct changes in seed production and indirect changes in competitive responses. Although the magnitude and sign of these changes were species specific, floral visitors promoted coexistence at neighbourhood scales while soil salinity did so over larger scales by changing the superior competitor's identity. Our results show how below and aboveground interactions maintain diversity in heterogeneous landscapes through their opposing effects on the determinants of competitive outcomes.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted July 31, 2017.
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Opposing effects of floral visitors and soil conditions on the determinants of competitive outcomes maintain species diversity in heterogeneous landscapes
Jose B. Lanuza, Ignasi Bartomeus, Oscar Godoy
bioRxiv 170423; doi: https://doi.org/10.1101/170423
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Opposing effects of floral visitors and soil conditions on the determinants of competitive outcomes maintain species diversity in heterogeneous landscapes
Jose B. Lanuza, Ignasi Bartomeus, Oscar Godoy
bioRxiv 170423; doi: https://doi.org/10.1101/170423

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