NDLI: Long-term change in limnology and invertebrates in Alaskan boreal wetlands

Content Provider	Springer Nature Link
Author	Corcoran, Robin M. Lovvorn, James R. Heglund, Patricia J.
Copyright Year	2008
Abstract	Climate change is more pronounced at high northern latitudes, and may be affecting the physical, chemical, and biological attributes of the abundant wetlands in boreal forests. On the Yukon Flats, located in the boreal forest of northeast Alaska, wetlands originally sampled during 1985–1989 were re-sampled for water chemistry and macroinvertebrates in summer 2001–2003. Wetlands sampled lost on average 19% surface water area between these periods. Total nitrogen and most metal cations (Na, Mg, and Ca, but not K) increased between these periods, whereas total phosphorus and chlorophyll a (Chl a) declined. These changes were greater in wetlands that had experienced more drying (decreased surface area). Compared with 1985–1989, densities of cladocerans, copepods, and ostracods in both June and August were much higher in 2002–2003, whereas densities of amphipods, gastropods, and chironomid larvae were generally lower. In comparisons among wetlands in 2002–2003 only, amphipod biomass was lower in wetlands with lower Chl a, which might help explain the decline of amphipods since the late 1980s when Chl a was higher. The decline in Chl a corresponded to greatly increased zooplankton density in June, suggesting a shift in carbon flow from scrapers and deposit-feeders to water-column grazers. Declines in benthic and epibenthic deposit-feeding invertebrates suggest important food web effects of climate change in otherwise pristine wetlands of the boreal forest.
Starting Page	77
Ending Page	89
Page Count	13
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	620
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-10-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Climate change Drying of wetlands Invertebrate communities Limnological change Wetland food webs Zoology Ecology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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