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

scholarly journals ‘Taking Fishers’ Knowledge to the Lab’: An Interdisciplinary Approach to Understand Fish Trophic Relationships in the Brazilian Amazon

2021 ◽  
Vol 9 ◽  
Author(s):  
Paula Evelyn Rubira Pereyra ◽  
Gustavo Hallwass ◽  
Mark Poesch ◽  
Renato Azevedo Matias Silvano
Keyword(s):  
Stable Isotopes ◽  
Food Webs ◽  
Fish Species ◽  
Trophic Interactions ◽  
Brazilian Amazon ◽  
Trophic Levels ◽  
Trophic Relationships ◽  
Ecological Knowledge ◽  
Data Limitations ◽  
Combining Data

Trophic levels can be applied to describe the ecological role of organisms in food webs and assess changes in ecosystems. Stable isotopes analysis can assist in the understanding of trophic interactions and use of food resources by aquatic organisms. The local ecological knowledge (LEK) of fishers can be an alternative to advance understanding about fish trophic interactions and to construct aquatic food webs, especially in regions lacking research capacity. The objectives of this study are: to calculate the trophic levels of six fish species important to fishing by combining data from stable isotopes analysis and fishers’ LEK in two clear water rivers (Tapajós and Tocantins) in the Brazilian Amazon; to compare the trophic levels of these fish between the two methods (stable isotopes analysis and LEK) and the two rivers; and to develop diagrams representing the trophic webs of the main fish prey and predators based on fisher’s LEK. The fish species studied were Pescada (Plagioscion squamosissimus), Tucunaré (Cichla pinima), Piranha (Serrasalmus rhombeus), Aracu (Leporinus fasciatus), Charuto (Hemiodus unimaculatus), and Jaraqui (Semaprochilodus spp.). A total of 98 interviews and 63 samples for stable isotopes analysis were carried out in both rivers. The average fish trophic levels did not differ between the stable isotopes analysis and the LEK in the Tapajós, nor in the Tocantins Rivers. The overall trophic level of the studied fish species obtained through the LEK did not differ from data obtained through the stable isotopes analysis in both rivers, except for the Aracu in the Tapajós River. The main food items consumed by the fish according to fishers’ LEK did agree with fish diets as described in the biological literature. Fishers provided useful information on fish predators and feeding habits of endangered species, such as river dolphin and river otter. Collaboration with fishers through LEK studies can be a viable approach to produce reliable data on fish trophic ecology to improve fisheries management and species conservation in tropical freshwater environments and other regions with data limitations.

scholarly journals An ecosystem model of food web and fisheries interactions in the Baltic Sea

2003 ◽  
Vol 60 (5) ◽  
pp. 939-950 ◽  
Author(s):  
Chris J Harvey ◽  
Sean P Cox ◽  
Timothy E Essington ◽  
Sture Hansson ◽  
James F Kitchell
Keyword(s):  
Baltic Sea ◽  
Food Web ◽  
Species Interactions ◽  
Gadus Morhua ◽  
Population Analysis ◽  
Clupea Harengus ◽  
Trophic Relationships ◽  
The Baltic Sea ◽  
Management Actions ◽  
The Baltic

Abstract Because fisheries operate within a complex array of species interactions, scientists increasingly recommend multispecies approaches to fisheries management. We created a food web model for the Baltic Sea proper, using the Ecopath with Ecosim software, to evaluate interactions between fisheries and the food web from 1974 to 2000. The model was based largely on values generated by multispecies virtual population analysis (MSVPA). Ecosim outputs closely reproduced MSVPA biomass estimates and catch data for sprat (Sprattus sprattus), herring (Clupea harengus), and cod (Gadus morhua), but only after making adjustments to cod recruitment, to vulnerability to predation of specific species, and to foraging times. Among the necessary adjustments were divergent trophic relationships between cod and clupeids: cod exhibited top-down control on sprat biomass, but had little influence on herring. Fishing, the chief source of mortality for cod and herring, and cod reproduction, as driven by oceanographic conditions as well as unexplained variability, were also key structuring forces. The model generated many hypotheses about relationships between key biota in the Baltic Sea food web and may ultimately provide a basis for estimating community responses to management actions.

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

Benthic-pelagic coupling in lake energetic food webs

2020 ◽  
Vol 417 ◽  
pp. 108928
Author(s):  
Shuran Cindy Wang ◽  
Xueqin Liu ◽  
Yong Liu ◽  
Hongzhu Wang
Keyword(s):  
Food Webs ◽  
Benthic Pelagic Coupling

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

Shoreline bank construction modifies benthic–pelagic coupling of food webs

2010 ◽  
Vol 36 (4) ◽  
pp. 601-604 ◽  
Author(s):  
Hideyuki Doi ◽  
Kwang-Hyeon Chang ◽  
Takamitsu Ando ◽  
Hiroyuki Imai ◽  
Shin-ichi Nakano
Keyword(s):  
Food Webs ◽  
Benthic Pelagic Coupling

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.

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