scholarly journals A sprinkling of gold dust: Pine pollen as a carbon source in Baltic Sea coastal food webs

2021 ◽  
Author(s):  
Camilla Liénart ◽  
Alyssa R. Cirtwill ◽  
Melanie L. Hedgespeth ◽  
Clare Bradshaw
Keyword(s):  
Carbon Source ◽  
Baltic Sea ◽  
Food Webs ◽  
Pine Pollen

scholarly journals Seabird Guano Fertilizes Baltic Sea Littoral Food Webs

PLoS ONE ◽  
2013 ◽  
Vol 8 (4) ◽  
pp. e61284 ◽  
Author(s):  
Karine Gagnon ◽  
Eva Rothäusler ◽  
Anneli Syrjänen ◽  
Maria Yli-Renko ◽  
Veijo Jormalainen
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
Seabird Guano

Experimental bottom-up influences on microbial food webs in eutrophic shallow waters of the Baltic Sea

1993 ◽  
Vol 25 (2) ◽  
pp. 991-994
Author(s):  
U. Schiewer ◽  
R. Heerkloss ◽  
K. Gocke ◽  
G. Jost ◽  
H.-P. Spittler ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
Shallow Waters ◽  
The Baltic Sea ◽  
Bottom Up ◽  
Microbial Food Webs ◽  
The Baltic

Effects of subsidized spiders on coastal food webs in the Baltic Sea area

2010 ◽  
Vol 11 (5) ◽  
pp. 450-458 ◽  
Author(s):  
Kajsa Mellbrand ◽  
Örjan Östman ◽  
Peter A. Hambäck
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
The Baltic Sea ◽  
The Baltic ◽  
Sea Area

Non-indigenous amphipods and mysids in coastal food webs of eastern Baltic Sea estuaries

2016 ◽  
Vol 97 (3) ◽  
pp. 581-590 ◽  
Author(s):  
Nadezhda A. Berezina ◽  
Arturas Razinkovas-Baziukas ◽  
Alexei V. Tiunov
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
Trophic Position ◽  
Isotope Analysis ◽  
River Estuary ◽  
Trophic Levels ◽  
Gut Contents ◽  
Curonian Lagoon ◽  
Gammarus Tigrinus ◽  
Neva Estuary

The study analyses the role of non-indigenous invertebrates in the food webs of two eutrophic brackish estuarine ecosystems of the Baltic Sea: the Neva River estuary and the Curonian Lagoon, with the aim of clarifying several questions such as what trophic levels were occupied by newly established species (mainly amphipods and mysids) and whether they can affect the native benthic invertebrates as a result of their possible carnivorous nature. Stable isotope analysis (δ15N values) and gut contents analysis of field-collected specimens were used to estimate trophic level and trophic links of the newly established malacostracan crustaceans, while their consumption rates when feeding as carnivores were measured experimentally. The δ15N analysis allocated four trophic levels (TL) in the coastal food webs of both studied ecosystems with the lowest δ15N (2–4‰) for detritus and algae and the highest for fish (12–14‰). Through their high abundance, non-indigenous crustaceans (Pontogammarus robustoides, Gmelinoides fasciatus, Obessogammarus crassus, Gammarus tigrinus, Limnomysis benedeni and Paramysis lacustris) have become important members of food chains of the studied ecosystems. Their trophic position varied significantly within species during ontogenesis. This suggests that they turned from being typically detritivores/plantivorous (TL 2–2.4) at juvenile stages to omnivores (2.5–3) or to carnivores (>3) as adults. Assessment of the predation pressure by the adult amphipods on other coexisting invertebrates (in the example of the Neva Estuary) showed a low or medium impact, depending on species of predator and productivity of its potential prey organisms.

scholarly journals Trophic position derived from amino-acid nitrogen isotopes reflect physiological status of both predator and prey over four decades

2021 ◽  
Author(s):  
Agnes ML Karlson ◽  
Caroline Ek ◽  
Douglas Jones
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Baltic Sea ◽  
Food Webs ◽  
Trophic Ecology ◽  
Trophic Position ◽  
Physiological Status ◽  
Ecological Knowledge ◽  
Ecological Data ◽  
Isotope Analyses

AbstractNitrogen isotope analyses of amino-acids (δ15N-AA) are increasingly used to decipher food webs. Interpretation of δ15N-AA in consumers relies on the assumption that physiological status has a negligible influence on the trophic enrichment factor (TEF). Recent experiments have shown that this is not always the case and there is a need to validate derived trophic position (TP) estimates using ecological data. We analyzed δ15N-AA in cod and herring (1980-2019) from the Baltic Sea, a species-poor system where dramatic reduction in condition status of cod has occurred. We expected that TEFcod-herring in trophic AAs would increase during periods of poor cod growth, resulting in inflated TP estimates. We found that TEF and TP estimates were negatively linked to individual condition status, prey fat content and the hypoxic state of the ecosystem. Statistically adjusting for these variables resulted in lower cod TP, highlighting the importance of including ecological knowledge when interpreting TP.Scientific Significance StatementNitrogen stable isotope analyses in amino acids are increasingly used in ecology to understand how environmental change impacts food-webs. Specifically, it is used to more accurately calculate trophic position (TP) of consumers. Controlled experiments have shown that physiological status can alter amino acid isotope composition and TP interpretation, but field studies are lacking. We use 40 years of archived material to demonstrate that TP estimates in Baltic Sea cod and its prey herring are directly related to physiological status. This has important implications for interpreting the real trophic ecology of consumers under environmental stress. By simultaneously measuring condition status in both predator and prey it is possible to adjust for them as confounding variables and decipher actual consumer TP.

scholarly journals Is there a BMAA transfer in the pelagic and benthic food webs in the Baltic Sea?

2018 ◽  
Author(s):  
Nadezda Zguna ◽  
Agnes Karlson ◽  
Leopold L. Ilag ◽  
Andrius Garbaras ◽  
Elena Gorokhova
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
Food Chain ◽  
Benthic Invertebrates ◽  
The Baltic Sea ◽  
Phytoplankton Communities ◽  
Benthic Food ◽  
Benthic Food Webs ◽  
The Baltic ◽  
Analytical Approaches

AbstractThe evidence regarding BMAA occurrence in the Baltic Sea is contradictory, with benthic sources appearing to be more important than pelagic ones. The latter is counterintuitive considering that pelagic primary producers, such as diatoms, dinoflagellates, and cyanobacteria, are the only plausible source of this compound in the food webs. To elucidate BMAA distribution in trophic pathways, we analyzed BMAA in the pelagic and benthic food webs sampled in summer 2010 in the Northern Baltic Proper. As potential BMAA sources, phytoplankton communities in early and late summer were used. As pelagic consumers, zooplankton, mysids and zooplanktivorous fish (herring) were used, whereas benthic invertebrates (amphipods, priapulids, polychaetes, and clams) and benthivorous fish (perch and flounder) represented the benthic food chain. To establish the trophic structure of the system, the stable isotope (δ13C and δ15N) composition of its components was determined. Contrary to the reported ubiquitous occurrence of BMAA in the Baltic food webs, only phytoplankton and lower consumers (zooplankton and mysids) of the pelagic food chain tested positive. Given that our analytical approaches were adequate, we conclude that no measurable levels of this compound occurred in the benthic invertebrates and any of the tested fish species in the study area. These findings indicate that widely assumed presence and transfer of BMAA to the top consumers in the food webs of the Baltic Sea and, possibly, other systems remain an open question. More controlled experiments and field observations are needed to understand the transfer and possible transformation of BMAA in the food web under various environmental settings.

Biomagnification of DDT through the Benthic and Pelagic Food Webs of Lake Malawi, East Africa:  Importance of Trophic Level and Carbon Source

2001 ◽  
Vol 35 (1) ◽  
pp. 14-20 ◽  
Author(s):  
Karen A. Kidd ◽  
Harvey A. Bootsma ◽  
Raymond H. Hesslein ◽  
Derek C. G. Muir ◽  
Robert E. Hecky
Keyword(s):  
Carbon Source ◽  
Food Webs ◽  
East Africa ◽  
Trophic Level ◽  
Lake Malawi ◽  
Pelagic Food Webs

scholarly journals Benthic‐pelagic coupling and trophic relationships in northern Baltic Sea food webs

2020 ◽  
Vol 65 (8) ◽  
pp. 1706-1722 ◽  
Author(s):  
Mikko Kiljunen ◽  
Heikki Peltonen ◽  
Maiju Lehtiniemi ◽  
Laura Uusitalo ◽  
Tuula Sinisalo ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
Trophic Relationships ◽  
Benthic Pelagic Coupling
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