scholarly journals Empirical correspondence between trophic transfer efficiency in freshwater food webs and the slope of their size spectra

Ecology ◽  
2018 ◽  
Vol 99 (6) ◽  
pp. 1463-1472 ◽  
Author(s):  
Thomas Mehner ◽  
Betty Lischke ◽  
Kristin Scharnweber ◽  
Katrin Attermeyer ◽  
Soren Brothers ◽  
...  
Keyword(s):  
Food Webs ◽  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Size Spectra ◽  
Trophic Transfer Efficiency

scholarly journals Global ecosystem overfishing: Clear delineation within real limits to production

2019 ◽  
Vol 5 (6) ◽  
pp. eaav0474 ◽  
Author(s):  
Jason S. Link ◽  
Reg A. Watson
Keyword(s):  
Primary Production ◽  
Satellite Data ◽  
Strong Evidence ◽  
Trophic Transfer ◽  
Marine Ecosystems ◽  
Tropical Fish ◽  
Transfer Efficiency ◽  
Target Populations ◽  
Trophic Transfer Efficiency ◽  
Clear Delineation

The well-documented value of marine fisheries is threatened by overfishing. Management typically focuses on target populations but lacks effective tools to document or restrain overexploitation of marine ecosystems. Here, we present three indices and accompanying thresholds to detect and delineate ecosystem overfishing (EOF): the Fogarty, Friedland, and Ryther indices. These are based on widely available and readily interpreted catch and satellite data that link fisheries landings to primary production using known limits of trophic transfer efficiency. We propose theoretically and empirically based thresholds for each of those indices; with these criteria, several ecosystems are fished sustainably, but nearly 40 to 50% of tropical and temperate ecosystems exceed even extreme thresholds. Applying these criteria to global fisheries data results in strong evidence for two specific instances of EOF, increases in both pressure on tropical fish and a climate-mediated polar shift. Here, we show that these two patterns represent evidence for global EOF.

scholarly journals Micro-scale patchiness enhances trophic transfer efficiency and potential plankton biodiversity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Anupam Priyadarshi ◽  
S. Lan Smith ◽  
Sandip Mandal ◽  
Mamoru Tanaka ◽  
Hidekatsu Yamazaki
Keyword(s):  
Food Chain ◽  
Trophic Transfer ◽  
Stability Domain ◽  
Transfer Efficiency ◽  
Ecosystem Models ◽  
Model Stability ◽  
Micro Scale ◽  
Trophic Transfer Efficiency ◽  
Generalized Framework ◽  
Aquatic Predators

AbstractRather than spatial means of biomass, observed overlap in the intermittent spatial distributions of aquatic predators and prey is known to be more important for determining the flow of nutrients and energy up the food chain. A few previous studies have separately suggested that such intermittency enhances phytoplankton growth and trophic transfer to sustain zooplankton and ultimately fisheries. Recent observations have revealed that phytoplankton distributions display consistently high degrees of mm scale patchiness, increasing along a gradient from estuarine to open ocean waters. Using a generalized framework of plankton ecosystem models with different trophic configurations, each accounting for this intermittency, we show that it consistently enhances trophic transfer efficiency (TE), i.e. the transfer of energy up the food chain, and expands the model stability domain. Our results provide a new explanation for observation-based estimates of unexpectedly high TE in the vast oligotrophic ocean and suggest that by enhancing the viable trait space, micro-scale variability may potentially sustain plankton biodiversity.

scholarly journals Future Climate Scenarios for a Coastal Productive Planktonic Food Web Resulting in Microplankton Phenology Changes and Decreased Trophic Transfer Efficiency

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e94388 ◽  
Author(s):  
Albert Calbet ◽  
Andrey F. Sazhin ◽  
Jens C. Nejstgaard ◽  
Stella A. Berger ◽  
Zachary S. Tait ◽  
...  
Keyword(s):  
Food Web ◽  
Trophic Transfer ◽  
Future Climate ◽  
Transfer Efficiency ◽  
Climate Scenarios ◽  
Planktonic Food ◽  
Trophic Transfer Efficiency

scholarly journals Coaggregation in a microbial predator–prey system affects competition and trophic transfer efficiency

Ecology ◽  
2013 ◽  
Vol 94 (4) ◽  
pp. 870-881 ◽  
Author(s):  
Gianluca Corno ◽  
Jörg Villiger ◽  
Jakob Pernthaler
Keyword(s):  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Predator Prey ◽  
Prey System ◽  
Trophic Transfer Efficiency

scholarly journals Ocean Acidification Affects the Phyto-Zoo Plankton Trophic Transfer Efficiency

PLoS ONE ◽  
2016 ◽  
Vol 11 (4) ◽  
pp. e0151739 ◽  
Author(s):  
Gemma Cripps ◽  
Kevin J. Flynn ◽  
Penelope K. Lindeque
Keyword(s):  
Ocean Acidification ◽  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Trophic Transfer Efficiency

scholarly journals Pelagic trophic transfer efficiency in an oligotrophic, dimictic deep lake (Lake Stechlin, Germany) and its relation to fisheries yield

Limnologica ◽  
2004 ◽  
Vol 34 (3) ◽  
pp. 264-273 ◽  
Author(s):  
Michael Schulz ◽  
Rainer Koschel ◽  
Claudia Reese ◽  
Thomas Mehner
Keyword(s):  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Deep Lake ◽  
Trophic Transfer Efficiency ◽  
Lake Stechlin

Estimate of Net Trophic Transfer Efficiency of PCBs to Lake Michigan Lake Trout from Their Prey

1998 ◽  
Vol 32 (7) ◽  
pp. 886-891 ◽  
Author(s):  
Charles P. Madenjian ◽  
Robert J. Hesselberg ◽  
Timothy J. DeSorcie ◽  
Larry J. Schmidt ◽  
Ralph M. Stedman ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Lake Trout ◽  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Trophic Transfer Efficiency

scholarly journals Planktonic food web structure and trophic transfer efficiency along a productivity gradient in the tropical and subtropical Atlantic Ocean

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Laia Armengol ◽  
Albert Calbet ◽  
Gara Franchy ◽  
Adriana Rodríguez-Santos ◽  
Santiago Hernández-León
Keyword(s):  
Atlantic Ocean ◽  
Food Web ◽  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Food Web Structure ◽  
Planktonic Food ◽  
Web Structure ◽  
Productivity Gradient ◽  
Trophic Transfer Efficiency

Application of trophic transfer efficiency and age structure in the trophic analysis of fossil assemblages

Lethaia ◽  
2001 ◽  
Vol 34 (2) ◽  
pp. 97-118 ◽  
Author(s):  
Eric N. Powell ◽  
George M. Staff ◽  
Robert J. Stanton ◽  
W. Russell Callender
Keyword(s):  
Age Structure ◽  
Trophic Transfer ◽  
Transfer Efficiency ◽  
Trophic Transfer Efficiency ◽  
Fossil Assemblages ◽  
Trophic Analysis
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