Spatial and temporal variability of organic matter sources and food web structure across benthic habitats in a low diversity system (southern Baltic Sea)

Marcelina Ziółkowska , Adam Sokołowski , Richard Pierre

Abstract

Understanding the effects of basal resources on the functioning of coastal ecosystems is of great interest in ecology since the different composition and availability of food sources directly affect trophic pathways and energy flow in systems. In this study, we determined which basal resources fuel the food webs of four benthic communities from different habitats in the shallow, low diversity Puck Lagoon (Gulf of Gdansk, southern Baltic Sea) over a full seasonal cycle. Using delta C-13 and delta N-15 values, the relative contribution of various potential carbon sources to the diets of dominant consumers were estimated with a mixing model in R (SIAR). The organic matter pool assimilated by macrofauna included primarily suspended particulate matter (SPOM), phytoplankton, and sediment detritus (SOM) that contained degraded vascular plants and macroalgae in areas with high vegetative biomass. Benthic invertebrates fed mostly on food sources available in their habitats and had species-specific carbon and nitrogen isotope compositions. On sediments with little vegetation, two separate trophic pathways included SPOM, phytoplankton, and suspension feeders, while SOM supported deposit feeders and omnivores in a sheltered environment close to a river mouth. On sediments dominated by Stuckenia, SOM and macroalgae supported the benthic food web that was dominated by opportunistic and tolerant omnivores and herbivores. In contrast, the large biomass of benthic vegetation and high SOM quality on Chara/Cladophora sediment induced high trophic diversity with two main trophic pathways, SPOM and phytoplankton supported suspension feeders, and macroalgae and epiphytes promoted grazers and omnivores. Vascular plants were found not to have been consumed by benthic invertebrates or fishes, but they provided suitable substrata for the macroalgae that developed on their blades and roots.
Author Marcelina Ziółkowska (FOG / IO / DMEF)
Marcelina Ziółkowska,,
- Division of Marine Ecosystems Functioning
, Adam Sokołowski (FOG / IO / DMEF)
Adam Sokołowski,,
- Division of Marine Ecosystems Functioning
, Richard Pierre
Richard Pierre,,
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Journal seriesJournal of Sea Research, ISSN 1385-1101, (A 30 pkt)
Issue year2018
Vol141
Pages47-60
Publication size in sheets0.65
Keywords in Englishcarbon sources, stable isotopes, benthic flora and fauna, food webs, low diversity system, Southern Baltic Sea
DOIDOI:10.1016/j.seares.2018.05.007
URL https://doi.org/10.1016/j.seares.2018.05.007
Languageen angielski
Score (nominal)30
ScoreMinisterial score = 30.0, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, ArticleFromJournal
Publication indicators WoS Impact Factor: 2017 = 1.729 (2) - 2017=1.986 (5)
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