Seaweed diversity enhances nitrogen uptake via complementary use of nitrate and ammonium.

Abstract:

:The consequences of declining biodiversity remain controversial, in part because many studies focus on a single metric of ecosystem functioning and fail to consider diversity's integrated effects on multiple ecosystem functions. We used tide pool microcosms as a model system to show that different conclusions about the potential effects of producer diversity on ecosystem functioning may result when ecosystem functions are measured separately vs. together. Specifically, we found that in diverse seaweed assemblages, uptake of either nitrate or ammonium alone was equal to the average of the component monocultures. However, when nitrate and ammonium were available simultaneously, uptake by diverse assemblages was 22% greater than the monoculture average because different species were complementary in their use of different nitrogen forms. Our results suggest that when individual species have dominant effects on particular ecosystem processes (i.e., the sampling effect), multivariate complementarity can arise if different species dominate different processes. Further, these results suggest that similar mechanisms (complementary nutrient uptake) may underlie diversity-functioning relationships in both algal and vascular-plant-based systems.

journal_name

Ecology

journal_title

Ecology

authors

Bracken ME,Stachowicz JJ

doi

10.1890/0012-9658(2006)87[2397:sdenuv]2.0.co;2

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

2397-403

issue

9

eissn

0012-9658

issn

1939-9170

journal_volume

87

pub_type

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