Functional Types of Marine Planktonic Primary Producers and Their Relative Significance in the Food Web

1984 ◽  
pp. 191-221 ◽  
Author(s):  
Malte Elbrächter
Keyword(s):  
Food Web ◽  
Primary Producers ◽  
Relative Significance ◽  
Functional Types

scholarly journals Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for15N Enrichment of Pelagic vs. Littoral Fisheries

2003 ◽  
Vol 3 ◽  
pp. 613-622 ◽  
Author(s):  
Karl E. Havens ◽  
Binhe Gu ◽  
Brian Fry ◽  
Carol Kendall
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Food Webs ◽  
Trophic Level ◽  
Stable Isotope Ratio ◽  
Pelagic Zone ◽  
Primary Producers ◽  
Subtropical Lake ◽  
Primary Consumers ◽  
Habitat Enrichment

The food webs of littoral, pelagic, and littoral-pelagic ecotone (interface) regions of a large subtropical lake were investigated using stable isotope ratio methods, expanding the focus of a previous fish-only study to include other food web components such as primary producers and invertebrates. In these food webs, δ13C increased ~4o/oo and δ15N increased ~10o/oo from primary producers to fish. The δ15N of fish was ~9o/oo in the littoral zone, ~10 o/oo in the ecotone, and ~12o/oo in the pelagic zone. The cross-habitat enrichment in fish15N corresponded with both an increase in the size of fish and an increase in the δ15N of primary consumers (mollusks). Despite larger body size in the pelagic zone, fish in all three habitats appear to occur at the same average trophic level (TL = 4), assuming an enrichment factor of 3.4o/oo per trophic level, and normalizing to the δ15N of primary consumers.

scholarly journals Benthic primary producers are key to sustain the Wadden Sea food web: stable carbon isotope analysis at landscape scale

Ecology ◽  
2017 ◽  
Vol 98 (6) ◽  
pp. 1498-1512 ◽  
Author(s):  
M. J. A. Christianen ◽  
J. J. Middelburg ◽  
S. J. Holthuijsen ◽  
J. Jouta ◽  
T. J. Compton ◽  
...  
Keyword(s):  
Food Web ◽  
Carbon Isotope ◽  
Wadden Sea ◽  
Stable Carbon Isotope ◽  
Isotope Analysis ◽  
Landscape Scale ◽  
Stable Carbon ◽  
Primary Producers ◽  
Stable Carbon Isotope Analysis ◽  
Carbon Isotope Analysis

Sediment Features, Primary Producers and Food Web Structure in Two Shallow Temporary Lakes (Monegros, Spain)

1997 ◽  
pp. 681-688
Author(s):  
P. Alcorlo ◽  
P. Díaz ◽  
J. Lacalle ◽  
A. Baltanás ◽  
M Florín ◽  
...  
Keyword(s):  
Food Web ◽  
Primary Producers ◽  
Food Web Structure ◽  
Web Structure

Sediment features, primary producers and food web structure in two shallow temporary Lakes (Monegros, Spain)

1997 ◽  
Vol 99 (1-4) ◽  
pp. 681-688 ◽  
Author(s):  
P. Alcorlo ◽  
P. Diaz ◽  
J. Lacalle ◽  
A. Baltanás ◽  
M. Florín ◽  
...  
Keyword(s):  
Food Web ◽  
Primary Producers ◽  
Food Web Structure ◽  
Web Structure

scholarly journals Food Web Fuel Differs Across Habitats and Seasons of a Tidal Freshwater Estuary

2020 ◽  
Vol 44 (1) ◽  
pp. 286-301
Author(s):  
Matthew Young ◽  
Emily Howe ◽  
Teejay O’Rear ◽  
Kathleen Berridge ◽  
Peter Moyle
Keyword(s):  
Food Web ◽  
Food Webs ◽  
San Francisco ◽  
Aquatic Vegetation ◽  
Environmental Variability ◽  
Spatial Scales ◽  
Water Channel ◽  
Trophic Levels ◽  
Food Sources ◽  
Primary Producers

AbstractEstuarine food webs are fueled by multiple different primary producers. However, identifying the relative importance of each producer to consumers is difficult, particularly for fishes that utilize multiple food sources due to both their mobility and their generally high trophic levels. Previous studies have documented broad spatial differences in the importance of primary producers to fishes within the Upper San Francisco Estuary, California, including separation between pelagic and littoral food webs. In this study, we evaluated the importance of primary producers to adult fishes in three closely spaced subregions that represented disparate habitat types (a tidal wetland channel, a turbid backwater channel, and a deep open-water channel), each a potential outcome of local restoration projects. Using stable isotope analysis coupled with a Bayesian mixing model, we identified significant differences in primary-producer contribution to fishes and invertebrates across habitats and seasons, especially in the relative contribution of submersed aquatic vegetation and phytoplankton. Most fishes utilized multiple primary producers and showed little segregation between pelagic and littoral food webs among habitats. Availability of primary producers differs seasonally and across multiple spatial scales, helping to buffer environmental variability and thus enhancing food web resilience. Ecosystem restoration may improve with emphasis on restoring a wide variety of primary producers to support consumers.

scholarly journals Interplay between the paradox of enrichment and nutrient cycling in food webs

2018 ◽  
Author(s):  
Pierre Quévreux ◽  
Sébastien Barot ◽  
Élisa Thébault
Keyword(s):  
Nutrient Cycling ◽  
Food Web ◽  
Food Webs ◽  
Trophic Level ◽  
Temporal Variability ◽  
Ecosystem Functioning ◽  
Nutrient Inputs ◽  
Primary Producers ◽  
Paradox Of Enrichment ◽  
Food Web Dynamics

AbstractNutrient cycling is fundamental to ecosystem functioning. Despite recent major advances in the understanding of complex food web dynamics, food web models have so far generally ignored nutrient cycling. However, nutrient cycling is expected to strongly impact food web stability and functioning. To make up for this gap, we built an allometric and size structured food web model including nutrient cycling. By releasing mineral nutrients, recycling increases the availability of limiting resources for primary producers and links each trophic level to the bottom of food webs. We found that nutrient cycling can provide a significant part of the total nutrient supply of the food web, leading to a strong enrichment effect that promotes species persistence in nutrient poor ecosystems but leads to a paradox of enrichment at high nutrient inputs. The presence of recycling loops linking each trophic level to the basal resources weakly affects species biomass temporal variability in the food web. Recycling loops tend to slightly dampen the destabilising effect of nutrient enrichment on consumer temporal variability while they have opposite effects for primary producers. By considering nutrient cycling, this new model improves our understanding of the response of food webs to nutrient availability and opens perspectives to better link studies on food web dynamics and ecosystem functioning.

scholarly journals Nitrogen stable isotopes of ammonium and nitrate in high mountain lakes of the Pyrenees

2009 ◽  
Vol 6 (6) ◽  
pp. 11479-11499
Author(s):  
M. Bartrons ◽  
L. Camarero ◽  
J. Catalan
Keyword(s):  
Stable Isotopes ◽  
Food Web ◽  
Primary Energy ◽  
Mountain Lakes ◽  
High Mountain ◽  
Nitrogen Stable Isotopes ◽  
Deep Lakes ◽  
Primary Producers ◽  
High Mountain Lakes ◽  
Maximum Water

Abstract. Nitrogen stable isotopes (δ15N) are increasingly used to trace food web relationships and the flow of matter in lakes. However, there is high variability in δ15N among primary producers and other primary energy resources that can eventually propagate throughout the lake food web. To increase our understanding of the origin of this variability, we measured ammonium and nitrate δ15N in atmospheric deposition (AD), epilimnetic water (EW), deep chlorophyll maximum water (DCMW), and sediment porewater (SPW) in eight mountain lakes. A general δ15N (−3.4‰) for AD was estimated as the signature for AD ammonium and nitrate did not differ. All lakes showed similar high δ15N-NH4+ values for SPW (ca. 2.2‰). In contrast, the variability among lakes in water column values was high, although differences between EW and DCMW within a lake were low. δ15N-NO3- correlated with the altitude of the lakes, and its variability was interpreted as the influence of catchment nitrification, which is higher in talus landscapes. δ15N-NH4+ distribution had two modes, positive values (ca. 3‰) were associated to DCMW of shallow lakes, and probably reflect the SPW influence. Lower values (ca. −3‰) occur in EW and DCMW of deep lakes, and its variability was related to the degree that NO3- was up taken by primary producers and recycled within the food-web when NH4+ availability was low compared to demand. Overall, altitude, lake depth and seasonal cumulative primary production largely explain the patterns of δ15N variability observed in nitrogen dissolved compounds.

Sign in / Sign up

Export Citation Format

Share Document