A distributed experiment demonstrates widespread sodium limitation in grassland food webs.

Abstract:

:Sodium (Na) has a unique role in food webs as a nutrient primarily limiting for plant consumers, but not other trophic levels. Environmental Na levels vary with proximity to coasts, local geomorphology, climate, and with anthropogenic inputs (e.g., road salt). We tested two key predictions across 54 grasslands in North America: Na shortfall commonly limits herbivore abundance, and the magnitude of this limitation varies inversely with environmental Na supplies. We tested them with a distributed pulse experiment and evaluated the relative importance of Na limitation to other classic drivers of climate, macronutrient levels, and plant productivity. Herbivore abundance increased by 45% with Na addition. Moreover, the magnitude of increase on Na addition plots decreased with increasing levels of plant Na, indicating Na satiation at sites with high Na concentrations in plant tissue. Our results demonstrate that invertebrate primary consumers are often Na limited and track local Na availability, with implications for the geography of invertebrate abundance and herbivory.

journal_name

Ecology

journal_title

Ecology

authors

Welti EAR,Sanders NJ,de Beurs KM,Kaspari M

doi

10.1002/ecy.2600

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

e02600

issue

3

eissn

0012-9658

issn

1939-9170

journal_volume

100

pub_type

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