The common jellyfish Aurelia aurita: standing stock, excretion and nutrient regeneration in the Kiel Bight, Western Baltic

1989 ◽  
Vol 100 (4) ◽  
pp. 507-514 ◽  
Author(s):  
G. Schneider
Keyword(s):  
Standing Stock ◽  
Aurelia Aurita ◽  
Nutrient Regeneration ◽  
Kiel Bight ◽  
The Common

Studies on a Calanus Patch II. The estimation of algal productive rates

1963 ◽  
Vol 43 (2) ◽  
pp. 339-347 ◽  
Author(s):  
D. H. Cushing
Keyword(s):  
Primary Productivity ◽  
Unit Volume ◽  
Standing Stock ◽  
Single Species ◽  
Algal Community ◽  
Division Rate ◽  
Common Experience ◽  
Unit Surface ◽  
The Common ◽  
Algal Material

Algal productive rates have rarely been estimated at sea, although many estimates have been made of primary productivity as g carbon/m2/day. A distinction may be drawn between productive rate and productivity, and it is in the use of the term ‘standing stock’. The latter is the quantity of living algal material per unit volume or beneath unit surface. The productive rate is the rate at which the standing stock reproduces itself; for a given species it is of course a division rate. It is expedient to use the term ‘division rate’ for a single species, but the term ‘productive rate’ may be used for the whole algal community. The productivity is the product of standing stock and productive rate and so contains in it the very great variations of standing stock that are the common experience of all planktologists.

Interspecific Predation of Common Strait of Georgia Planktonic Coelenterates: Laboratory Evidence

1980 ◽  
Vol 37 (1) ◽  
pp. 120-123 ◽  
Author(s):  
Mary Needler Arai ◽  
J. Roger Jacobs
Keyword(s):  
Aurelia Aurita ◽  
Strait Of Georgia ◽  
Aequorea Victoria ◽  
Laboratory Evidence ◽  
Laboratory Conditions ◽  
Interspecific Predation ◽  
The Common

Among the common pelagic coelenterates of Departure Bay, B.C., Stomotoca atra, Eutonina indicans, Aequorea victoria, and Aurelia aurita show predation on other species under laboratory conditions. Selectivity is demonstrated in the diets of each of these predators.Key words: Stomotoca atra, Eutonina indicans, Aequorea victoria, medusae, feeding, Aurelia aurita

Behaviour and ecological importance of a mud snail (Ilyanassa obsoleta) population in a temperate macrotidal estuary

1988 ◽  
Vol 66 (2) ◽  
pp. 459-466 ◽  
Author(s):  
Peter J. Cranford
Keyword(s):  
Intertidal Zone ◽  
Standing Stock ◽  
Bay Of Fundy ◽  
Subtidal Zone ◽  
Ilyanassa Obsoleta ◽  
Energy Reserves ◽  
Nutrient Regeneration ◽  
Southern Bight ◽  
Mud Flat ◽  
Ecological Importance

A population of Ilyanassa obsoleta was sampled during the 8-month period when they are present in the intertidal zone in the Southern Bight of Minas Basin, Bay of Fundy. Mud snails were first observed in April, and spawning took place in late May and early June. Flesh weight increased between May and November, with the highest growth rates recorded during August and September. During November the population returned to the subtidal zone, where energy reserves are partially utilized during winter. Clustering and differential habitat selection (salt marsh or mud flat) within size classes resulted in large spatial variations in density, standing stock, and production. Production by I. obsoleta averaged 1.1 g C∙m−2 during their stay in the intertidal zone. The supply of carbon from epibenthic microalgae is insufficient to meet the requirements of this population. Detritus derived from Spartina is believed to be an important additional source of carbon. Ilyanassa obsoleta is not a major prey item of any of the better known predators in this region. Their importance to the intertidal community results from the direct (predation) and indirect (competition, disturbance, nutrient regeneration, and bioturbation) influence of their presence on sedimentary microbial processes and the resident benthic flora and fauna.

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