scholarly journals Absorption efficiency, ingestion rate, gut passage time and scope for growth in suspension- and deposit-feeding Yoldia hyperborea

2003 ◽  
Vol 252 ◽  
pp. 159-172 ◽  
Author(s):  
RA Stead ◽  
RJ Thompson ◽  
JR Jaramillo
Keyword(s):  
Ingestion Rate ◽  
Passage Time ◽  
Absorption Efficiency ◽  
Scope For Growth ◽  
Gut Passage ◽  
Deposit Feeding ◽  
Yoldia Hyperborea

scholarly journals Feeding plasticity more than metabolic rate drives the productivity of economically important filter feeders in response to elevated CO2 and reduced salinity

2018 ◽  
Vol 75 (6) ◽  
pp. 2117-2128 ◽  
Author(s):  
Samuel P S Rastrick ◽  
Victoria Collier ◽  
Helen Graham ◽  
Tore Strohmeier ◽  
Nia M Whiteley ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Biological Effects ◽  
Absorption Efficiency ◽  
Environmental Stressors ◽  
Elevated Pco2 ◽  
Combined Effects ◽  
Metabolic Rates ◽  
Scope For Growth ◽  
Filter Feeders ◽  
Feeding Plasticity

Abstract Climate change driven alterations in salinity and carbonate chemistry are predicted to have significant implications particularly for northern costal organisms, including the economically important filter feeders Mytilus edulis and Ciona intestinalis. However, despite a growing number of studies investigating the biological effects of multiple environmental stressors, the combined effects of elevated pCO2 and reduced salinity remain comparatively understudied. Changes in metabolic costs associated with homeostasis and feeding/digestion in response to environmental stressors may reallocate energy from growth and reproduction, affecting performance. Although these energetic trade-offs in response to changes in routine metabolic rates have been well demonstrated fewer studies have investigated how these are affected by changes in feeding plasticity. Consequently, the present study investigated the combined effects of 26 days’ exposure to elevated pCO2 (500 µatm and 1000 µatm) and reduced salinity (30, 23, and 16) on the energy available for growth and performance (Scope for Growth) in M. edulis and C. intestinalis, and the role of metabolic rate (oxygen uptake) and feeding plasticity [clearance rate (CR) and absorption efficiency] in this process. In M. edulis exposure to elevated pCO2 resulted in a 50% reduction in Scope for Growth. However, elevated pCO2 had a much greater effect on C. intestinalis, with more than a 70% reduction in Scope for Growth. In M. edulis negative responses to elevated pCO2 are also unlikely be further affected by changes in salinity between 16 and 30. Whereas, under future predicted levels of pCO2C. intestinalis showed 100% mortality at a salinity of 16, and a >90% decrease in Scope for Growth with reduced biomass at a salinity of 23. Importantly, this work demonstrates energy available for production is more dependent on feeding plasticity, i.e. the ability to regulate CR and absorption efficiency, in response to multiple stressors than on more commonly studied changes in metabolic rates.

A simple parametric method for reducing sample sizes in gut passage time trials

Ecology ◽  
2009 ◽  
Vol 90 (8) ◽  
pp. 2328-2331 ◽  
Author(s):  
John Rawsthorne ◽  
David A. Roshier ◽  
Sean R. Murphy
Keyword(s):  
Parametric Method ◽  
Passage Time ◽  
Sample Sizes ◽  
Gut Passage

Carbon and Nitrogen Scope for Growth as A Function of Diet in the Sea Scallop Placopecten Magellanicus

1991 ◽  
Vol 71 (2) ◽  
pp. 437-450 ◽  
Author(s):  
Jonathan Grant ◽  
Peter J. Cranford
Keyword(s):  
Nitrogen Content ◽  
Clearance Rate ◽  
Absorption Efficiency ◽  
Placopecten Magellanicus ◽  
Scope For Growth ◽  
Carbon And Nitrogen ◽  
Tissue Weight ◽  
Sea Scallop ◽  
Feeding Experiments ◽  
Carbon And Nitrogen Content

Laboratory feeding experiments with the sea scallop Placopecten magellanicus were carried out to compare scope for growth (SFG) to measured growth and determine the effect of diet on carbon and nitrogen SFG. Diets consisting of cultured phytoplankton, kelp detritus, and resuspended sediment were provided daily for 52 days (October-December). Measurements of clearance rate, absorption efficiency, respiration, O/N ratio, and carbon and nitrogen content of diets and scallop tissue were used to construct carbon and nitrogenbudgets for each diet. Growth coefficients were calculated from change in tissue weight during the study period.

scholarly journals Oxidative coupling during gut passage in marine deposit-feeding invertebrates

2004 ◽  
Vol 49 (3) ◽  
pp. 716-726 ◽  
Author(s):  
Anders M. B. Giessing ◽  
Lawrence M. Mayer
Keyword(s):  
Oxidative Coupling ◽  
Gut Passage ◽  
Deposit Feeding ◽  
Marine Deposit

Scope for growth versus actual growth in the juvenile predatory gastropod Chorus giganteus

2006 ◽  
Vol 86 (6) ◽  
pp. 1423-1428 ◽  
Author(s):  
J.M. Navarro ◽  
G.X. Urrutia ◽  
C. Carrasco
Keyword(s):  
Ingestion Rate ◽  
High Sensitivity ◽  
Point Of View ◽  
The Body ◽  
Experimental Conditions ◽  
Pronounced Increase ◽  
Continuous Increase ◽  
Scope For Growth ◽  
Physiological Variables ◽  
Actual Growth

The scope for growth (SFG) calculated on measurements of physiological variables in juvenile of the predatory gastropod Chorus giganteus was compared with the actual growth under an energetic point of view. The continuous increase in the amount of food ingested and absorbed by C. giganteus was clearly related to the body size of the snails. The pronounced increase in the metabolic processes of respiration and excretion at the end of the study was related with the high rates of growth experienced by the snails under the experimental conditions. These results were supported by the correlation analysis where ingestion rate (r=0.99), oxygen consumption (r=0.88) and excretion rate (r=0.89) were significantly correlated with the actual growth (P≤0.05). Comparing the estimated growth curve (SFG) with that directly measured on juvenile individuals of C. giganteus, a high similarity in results was observed. The high sensitivity of the scope for growth argues for the use of this index as an adequate tool for estimating the growth of juvenile gastropod molluscs without interference from reproductive processes such as gametogenesis and spawning which may produce corresponding rises and falls in the biomass of individuals. Scope for growth is thus validated as a reliable measurement of the physiological/energetic condition of the organism, representing an effective index for indirect estimation of the growth of a species.

scholarly journals Internal dispersal of seeds by waterfowl: effect of seed size on gut passage time and germination patterns

2010 ◽  
Vol 97 (6) ◽  
pp. 555-565 ◽  
Author(s):  
Jordi Figuerola ◽  
Iris Charalambidou ◽  
Luis Santamaria ◽  
Andy J. Green
Keyword(s):  
Seed Size ◽  
Passage Time ◽  
Gut Passage

scholarly journals Estimation of gut passage time of wild, free roaming forest elephants

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Christopher Beirne ◽  
Chase L. Nuñez ◽  
Melissa Baldino ◽  
Seokmin Kim ◽  
Julia Knorr ◽  
...  
Keyword(s):  
Passage Time ◽  
Gut Passage ◽  
Forest Elephants
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