+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn

+ Translate
+ Recently Requested

Seasonal food web structures and sympagic-pelagic coupling in the European Arctic revealed by stable isotopes and a two-source food web model

Seasonal food web structures and sympagic-pelagic coupling in the European Arctic revealed by stable isotopes and a two-source food web model

Progress in Oceanography 71(1): 59-87

We simultaneously followed stable carbon ([delta]13C) and nitrogen ([delta]15N) isotopes in a two-source food web model to determine trophic levels and the relative importance of open water- and ice-associated food sources (phytoplankton vs. ice algae) in the lower marine food web in the European Arctic during four seasons. The model is based upon extensive seasonal data from 1995 to 2001. Phytoplankton, represented by samples of particulate organic matter from open water (Pelagic-POM) and ice algae, represented by samples from the underside of the ice (Ice-POM), were isotopically different. Ice-POM was generally dominated by the typical ice diatoms Nitzschia frigida and Melosira arctica and was more enriched than Pelagic-POM in 13C ([delta]13C = -20[per mill]; vs. -24[per mill];), but less enriched in 15N ([delta]15N = 1.8[per mill]; vs. 4.0[per mill];). However, when dominated by pelagic algae, Ice-POM was enriched in 13C and 15N similarly to Pelagic-POM. The derived trophic enrichment factors for [delta]15N ([DELTA]N = 3.4[per mill];) and [delta]13C ([DELTA]C = 0.6[per mill];) were similar in both pelagic and sympagic (ice-associated) systems, although the [DELTA]C for the sympagic system was variable. Trophic level (TL) range for zooplankton (TL = 1.8-3.8) was similar to that of ice fauna (TL = 1.9-3.7), but ice amphipods were generally less enriched in [delta]15N than zooplankton, reflecting lower [delta]15N in Ice-POM compared to Pelagic-POM. For bulk zooplankton, TLs and carbon sources changed little seasonally, but the proportion of herbivores was higher during May-September than in October and March. Overall, we found that the primary carbon source for zooplankton was Pelagic-POM (mean 74%), but depending on species, season and TL, substantial carbon (up to 50%) was supplied from the sympagic system. For bulk ice fauna, no major changes were found in TLs or carbon sources from summer to autumn. The primary carbon source for ice fauna was Ice-POM (mean 67%), although ice fauna with TL > 3 (adult Onisimus nanseni and juvenile polar cod) primarily utilized a pelagic food source.

(PDF emailed within 0-6 h: $19.90)

Accession: 023569445

Download citation: RISBibTeXText

DOI: 10.1016/j.pocean.2006.06.001

Related references

Sympagic-pelagic-benthic coupling in Arctic and Atlantic waters around Svalbard revealed by stable isotopic and fatty acid tracers. Marine Biology Research 9(9): 831-850, 2013

Pelagic-benthic coupling, food webs, and organic matter degradation in the Chukchi Sea: Insights from sedimentary pigments and stable carbon isotopes. Limnology and Oceanography 60(2): 429-445, 2015

Comparative trophic structures of macrobenthic food web in two macrotidal wetlands with and without a dike on the temperate coast of Korea as revealed by stable isotopes. Marine Environmental Research 131: 134-145, 2017

Using stable isotopes to assess carbon and nitrogen turnover in the Arctic sympagic amphipod Onisimus litoralis. Oecologia 158(1): 11-22, 2008

Assessing the food web impacts of an anadromous Arctic charr introduction to a sub-Arctic watershed using stable isotopes. Fisheries Management and Ecology 20(4): 302-314, 2013

Seasonality of stable carbon isotopes within the pelagic food web of Lake Kinneret. Limnology & Oceanography 39(5): 1030-1043, 1994

Differentiation between littoral and pelagic food webs in lakes using stable carbon isotopes. Limnology & Oceanography. 40(7): 1310-1313, 1995

Seasonality of stable carbon and nitrogen isotopes within the pelagic food web of Taihu Lake. Annales de Limnologie 44(1): 1-6, 2008

Ciguatera toxins in the food chain revealed by stable isotopes. Bulletin de la Societe de Pathologie Exotique 85(5 Pt 2): 510-513, 1992

An assessment, using stable isotopes, of the importance of allochthonous organic carbon sources to the pelagic food web in Loch Ness. Proceedings Of The Royal Society Of London Series B Biological Sciences. 265(1391): 105-111,. 22, 1998

Using ratios of stable nitrogen and carbon isotopes to characterize the biomagnification of DDE, mirex, and PCB in a Lake Ontario pelagic food web. Canadian Journal of Fisheries & Aquatic Sciences 52(12): 2660-2674, 1995

Trophic positioning of meiofauna revealed by stable isotopes and food web analyses. Ecology 97(11): 3099-3109, 2016

Stable carbon isotopes as pelagic food web tracers in adjacent shelf and slope regions off British Columbia, Canada. Canadian Journal of Fisheries & Aquatic Sciences 56(12): 2477-2486, 1999

Current state and trends in Canadian Arctic marine ecosystems: II. Heterotrophic food web, pelagic-benthic coupling, and biodiversity. Climatic Change 115(1): 179-205, 2012

Prey dominance shapes trophic structure of the northern California Current pelagic food web evidence from stable isotopes and diet analysis. Marine Ecology Progress Series 420: 15-26, 2010