scholarly journals Effects of warming and shifts of pelagic food web structure on benthic productivity in a coastal marine system

2009 ◽  
Vol 396 ◽  
pp. 13-25 ◽  
Author(s):  
AK Eriksson Wiklund ◽  
K Dahlgren ◽  
B Sundelin ◽  
A Andersson
Keyword(s):  
Food Web ◽  
Food Web Structure ◽  
Web Structure ◽  
Pelagic Food Web ◽  
Coastal Marine ◽  
Benthic Productivity ◽  
Marine System ◽  
And Shifts

Trophic Characterization, Pelagic Food Web Structure and Comparison of Two Mesotrophic Lakes in Brandenburg (Germany)

2000 ◽  
Vol 85 (2-3) ◽  
pp. 167-189 ◽  
Author(s):  
Peter Kasprzak ◽  
Frank Gervais ◽  
Rita Adrian ◽  
Winfried Weiler ◽  
Robert Radke ◽  
...  
Keyword(s):  
Food Web ◽  
Food Web Structure ◽  
Web Structure ◽  
Pelagic Food Web

Interactions with the Benthos Alter Pelagic Food Web Structure in Coastal Waters

1991 ◽  
Vol 48 (11) ◽  
pp. 2276-2284 ◽  
Author(s):  
Barbara K. Sullivan ◽  
Peter H. Doering ◽  
Candace A. Oviatt ◽  
Aimee A. Keller ◽  
Jeffrey B. Frithsen
Keyword(s):  
Food Web ◽  
Water Column ◽  
Coastal Waters ◽  
Benthic Communities ◽  
Food Web Structure ◽  
Web Structure ◽  
Pelagic Food Web ◽  
High Nutrient ◽  
Pelagic Food Webs ◽  
Benthic Pelagic Coupling

Results from studies in experimental enclosures containing both water column and benthic communities show that the benthos has an important effect on the structure and productivity of pelagic food webs whether the system is nutrient enriched or nutrient limited. Research over a 10-yr period in 13-m3 mesocosms showed that changes in the pelagic food web were correlated with different sediment communities and with the presence or absence of a benthos. The abundance of copepods was inversely correlated with numbers of macrofauna. At both low and high nutrient levels, systems without benthos had greatly enhanced numbers of carnivorous holozooplankton including ctenophores, medusans, chaetognaths, and fish. Our observations indicate that the presence of the benthos shortens the pelagic food web.and inhibits the response of pelagic fauna to nutrient enrichment in well-mixed coastal waters. The strength of benthic–pelagic coupling, which is controlled by the amount of turbulence in the water column, may be more important to food web structure than the rate of nutrient supply and could determine which subsystem responds to eutrophication.

Pelagic Food Web Structure in Acidic Adirondack Mountain, New York, Lakes of Varying Humic Content

1993 ◽  
Vol 50 (12) ◽  
pp. 2688-2691 ◽  
Author(s):  
Karl E. Havens
Keyword(s):  
New York ◽  
Food Web ◽  
Species Number ◽  
Lake Area ◽  
Food Web Structure ◽  
Web Structure ◽  
Pelagic Food Web ◽  
Adirondack Mountain ◽  
Acid Waters ◽  
Total P

Pelagic food web models were constructed for 28 acidic (pH < 5.0) Adirondack Mountain lakes, and multiple regression analyses were done to quantify relationships between abiotic variables (DOC, monomeric Al, total P, and H+ concentrations and lake area) and three food web attributes (number of species, number of links, and links per species) Regression models contained log DOC and H+ as significant predictors of food web structure. The models explained over 35% of the variation in species, links and links per species; most of the variation was explained by log DOC. Species, links and links per species increased as DOC increased from <2 to roughly 4 mg∙L−1. At higher DOC levels, the food web attributes reached plateaus at 35 species, 120 links, and 4 links per species. The results support the view that in acidic lakes, DOC ameliorates the toxic effects of Al, so that above a saturating DOC level of approximately 4 mg∙L−1, Al-sensitive biota can exist in acid waters. Hence, food webs of high DOC acid lakes are larger and more complex than their low DOC counterparts.

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