In:
PLOS ONE, Public Library of Science (PLoS), Vol. 18, No. 5 ( 2023-5-26), p. e0286368-
Abstract:
Arctic lowland tundra is often dominated by wetlands. As numbers and types of these wetlands change with climate warming, their invertebrate biomass and assemblages may also be affected. Increased influx of nutrients and dissolved organic matter (DOM) from thawing peat may alter the relative availability of organic matter (OM) sources, differentially affecting taxa with disparate dependence on those sources. In five shallow wetland types ( 〈 40 to 110 cm deep) and in littoral zones of deeper lakes ( 〉 150 cm), we used stable isotopes (δ 13 C, δ 15 N) to compare contributions of four OM sources (periphytic microalgae, cyanobacteria, macrophytes, peat) to the diets of nine macroinvertebrate taxa. Living macrophytes were not distinguishable isotopically from peat that likely contributed most DOM. Within invertebrate taxa, relative OM contributions were similar among all wetland types except deeper lakes. Physidae snails consumed substantial amounts of OM from cyanobacteria. However, for all other taxa examined, microalgae were the dominant or a major OM source (39–82%, mean 59%) in all wetland types except deeper lakes (20‒62%, mean 31%). Macrophytes and macrophyte-derived peat, likely consumed mostly indirectly as DOM-supported bacteria, ranged from 18‒61% (mean 41%) of ultimate OM sources in all wetland types except deeper lakes (38–80%, mean 69%). Invertebrate consumption of microalgal C may often have involved bacterial intermediates, or a mix of algae with bacteria consuming peat-derived OM. High production of periphyton with very low δ 13 C values were favored by continuous daylight illuminating shallow depths, high N and P levels, and high CO 2 concentrations from bacterial respiration of peat-derived DOM. Although relative OM sources were similar across wetland types except deeper lakes, total invertebrate biomass was much higher in shallow wetlands with emergent vegetation. Impacts of warming on the availability of invertebrate prey to waterbirds will likely depend not on shifts in OM sources, but more on changes in overall number or area of shallow emergent wetlands.
Type of Medium:
Online Resource
ISSN:
1932-6203
DOI:
10.1371/journal.pone.0286368
DOI:
10.1371/journal.pone.0286368.g001
DOI:
10.1371/journal.pone.0286368.g002
DOI:
10.1371/journal.pone.0286368.g003
DOI:
10.1371/journal.pone.0286368.g004
DOI:
10.1371/journal.pone.0286368.g005
DOI:
10.1371/journal.pone.0286368.g006
DOI:
10.1371/journal.pone.0286368.t001
DOI:
10.1371/journal.pone.0286368.t002
DOI:
10.1371/journal.pone.0286368.s001
DOI:
10.1371/journal.pone.0286368.s002
DOI:
10.1371/journal.pone.0286368.s003
DOI:
10.1371/journal.pone.0286368.s004
DOI:
10.1371/journal.pone.0286368.s005
DOI:
10.1371/journal.pone.0286368.s006
DOI:
10.1371/journal.pone.0286368.s007
DOI:
10.1371/journal.pone.0286368.s008
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2023
detail.hit.zdb_id:
2267670-3
Bookmarklink
