Long-term changes in the western Dutch Wadden Sea food web and the impact of invasive species

10.33540/348 ◽  
2021 ◽  
Author(s):  
◽  
Alexa Sarina Jung
Keyword(s):  
Invasive Species ◽  
Food Web ◽  
Wadden Sea ◽  
Long Term Changes ◽  
The Impact

Long-term changes in species composition of demersal fish and epibenthic species in the Jade area (German Wadden Sea/Southern North Sea) since 1972

2016 ◽  
Vol 181 ◽  
pp. 284-293 ◽  
Author(s):  
Julia Meyer ◽  
Ingrid Kröncke ◽  
Alexander Bartholomä ◽  
Joachim W. Dippner ◽  
Ulrike Schückel
Keyword(s):  
Species Composition ◽  
North Sea ◽  
Wadden Sea ◽  
Demersal Fish ◽  
Southern North Sea ◽  
Long Term Changes

Long-term changes in the Georges Bank food web: trends in stable isotopic compositions of fish scales

1993 ◽  
Vol 115 (3) ◽  
pp. 481-493 ◽  
Author(s):  
S. C. Wainright ◽  
M. J. Fogarty ◽  
R. C. Greenfield ◽  
B. Fry
Keyword(s):  
Food Web ◽  
Fish Scales ◽  
Georges Bank ◽  
Isotopic Compositions ◽  
Stable Isotopic ◽  
Long Term Changes

scholarly journals Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan

2019 ◽  
Vol 116 (47) ◽  
pp. 23600-23608 ◽  
Author(s):  
Ryan F. Lepak ◽  
Joel C. Hoffman ◽  
Sarah E. Janssen ◽  
David P. Krabbenhoft ◽  
Jacob M. Ogorek ◽  
...  
Keyword(s):  
Invasive Species ◽  
Great Lakes ◽  
Food Web ◽  
Lake Michigan ◽  
Lake Trout ◽  
Mitigation Strategies ◽  
Predatory Fish ◽  
Isotopic Analyses ◽  
C And N ◽  
The Impact

To understand the impact reduced mercury (Hg) loading and invasive species have had on methylmercury bioaccumulation in predator fish of Lake Michigan, we reconstructed bioaccumulation trends from a fish archive (1978 to 2012). By measuring fish Hg stable isotope ratios, we related temporal changes in Hg concentrations to varying Hg sources. Additionally, dietary tracers were necessary to identify food web influences. Through combined Hg, C, and N stable isotopic analyses, we were able to differentiate between a shift in Hg sources to fish and periods when energetic transitions (from dreissenid mussels) led to the assimilation of contrasting Hg pools (2000 to present). In the late 1980s, lake trout δ202Hg increased (0.4‰) from regulatory reductions in regional Hg emissions. After 2000, C and N isotopes ratios revealed altered food web pathways, resulting in a benthic energetic shift and changes to Hg bioaccumulation. Continued increases in δ202Hg indicate fish are responding to several United States mercury emission mitigation strategies that were initiated circa 1990 and continued through the 2011 promulgation of the Mercury and Air Toxics Standards rule. Unlike archives of sediments, this fish archive tracks Hg sources susceptible to bioaccumulation in Great Lakes fisheries. Analysis reveals that trends in fish Hg concentrations can be substantially affected by shifts in trophic structure and dietary preferences initiated by invasive species in the Great Lakes. This does not diminish the benefits of declining emissions over this period, as fish Hg concentrations would have been higher without these actions.

scholarly journals Analyzing the market position of fish species subject to the impact of long-term changes: a case study of French fisheries in the Bay of Biscay

2008 ◽  
Vol 21 (3) ◽  
pp. 307-316 ◽  
Author(s):  
Pascal Le Floc'h ◽  
Jean-Charles Poulard ◽  
Olivier Thébaud ◽  
Fabian Blanchard ◽  
Julien Bihel ◽  
...  
Keyword(s):  
Fish Species ◽  
Bay Of Biscay ◽  
Market Position ◽  
Long Term Changes ◽  
The Impact

Impacts of macrozoobenthic invasions on a temperate coastal food web

2020 ◽  
Vol 653 ◽  
pp. 19-39
Author(s):  
AS Jung ◽  
HW van der Veer ◽  
CJM Philippart ◽  
AM Waser ◽  
BJ Ens ◽  
...  
Keyword(s):  
Food Web ◽  
Native Species ◽  
Wadden Sea ◽  
Marine Species ◽  
Trophic Levels ◽  
Food Web Structure ◽  
Total Consumption ◽  
Predator Prey ◽  
Carbon Transfer ◽  
The Impact

Invasions of marine species are changing coastal food webs worldwide, impacting on trophic interactions between native species (e.g. predator-prey relationships). Here, the impact of 3 macrozoobenthic invasive species on food web structure and functioning at Balgzand (western Wadden Sea) is quantified by using ecological network analysis (ENA). The bivalves Ensis leei and Magallana gigas were observed for the first time in 1984 and 2001, respectively, and the polychaete Marenzelleria viridis appeared in 1989. Although E. leei and M. viridis reached similar peak biomasses in the 2000s (ca. 1700 and 2000 mg C m-2, respectively), the bivalve consumption was higher (>45% of total consumption) than that of the polychaete (<10%). Biomass and impact of M. gigas remained relatively low. E. leei occupied an ecological niche that was relatively unoccupied, which led to competitive advantage with respect to other suspension feeders. Increasing biomass of E. leei coincided with a 70% increase of trophic carbon transfer from primary to secondary producers and an 80% increase from secondary producers to detritus. Carbon flows from secondary producers to higher trophic levels were reduced by more than 60%. These shifts in trophic transfer were stronger than those observed during the invasion of M. gigas in the NE Wadden Sea. At Balgzand, biomass of M. gigas and M. viridis rapidly declined to low values in the 2010s, implying a temporally limited impact. In the 2010s, E. leei was still responsible for 30% of the total consumption in the 2010s, indicating a longer-term impact.

Long-term changes in fish community and the impact of exotic fish, between the Nakdong River and Upo Wetlands

2011 ◽  
Vol 34 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Hyun-Bin Jo ◽  
Min-Ho Jang ◽  
Kwang-Seuk Jeong ◽  
Yun-O Do ◽  
Gea-Jae Joo ◽  
...  
Keyword(s):  
Fish Community ◽  
Nakdong River ◽  
Exotic Fish ◽  
Long Term Changes ◽  
The Nakdong River ◽  
The Impact
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