Feeding By Oyster Larvae: The Functional Response, Energy Budget and A Comparison With Mussel Larvae

Whereas there is a wealth of literature on the feeding of herbivorous holo-plankton, notably copepods, feeding by herbivorous larvae of benthic animals has been somewhat neglected. This paper considers the functional feeding response of veliger larvae of Ostrea edulis L., Crassostrea gigas (Thunberg) and Mytilus edulis L. fed on several micro-algal species. It also provides some data on the influence of temperature on feeding, and assesses the energy needs of the larvae in relation to their potential ingestion rate and to the availability in the sea of micro-organisms on which they feed.

Download Full-text

Influence of temperature on respiratory ETS-activity of micro-organisms from Admiralty Bay, King George Island, Antarctica

Netherlands Journal of Sea Research ◽

10.1016/0077-7579(91)90019-w ◽

1991 ◽

Vol 28 (3) ◽

pp. 221-225 ◽

Cited By ~ 21

Author(s):

J.H. Vosjan ◽

K.M. Olańczuk-Neyman

Keyword(s):

King George Island ◽

Ets Activity ◽

Influence Of Temperature ◽

Admiralty Bay ◽

Influence Of Temperature On ◽

Micro Organisms

Download Full-text

Functional feeding response of Nordic and Arctic krill on natural phytoplankton and zooplankton

Journal of Plankton Research ◽

10.1093/plankt/fbaa012 ◽

2020 ◽

Vol 42 (2) ◽

pp. 239-252

Author(s):

Jory Cabrol ◽

Anaïs Fabre ◽

Christian Nozais ◽

Réjean Tremblay ◽

Michel Starr ◽

...

Keyword(s):

Ingestion Rate ◽

Trophic Levels ◽

Feeding Response ◽

Feeding Selectivity ◽

Feeding Experiments ◽

Energy Needs ◽

Metabolic Costs ◽

Coexisting Species ◽

Natural Phytoplankton ◽

Natural Communities

Abstract Krill species play a pivotal role in energetic transfer from lower to upper trophic levels. However, functional feeding responses, which determine how food availability influences ingestion rates, are still not well defined for northern krill species. Here, we estimated and compared the functional feeding responses on natural communities of phytoplankton and mesozooplankton of two coexisting species, Meganyctiphanes norvegica and Thysanoessa raschii. We tested the influence of the presence of phytoplankton on the ingestion rate and the selectivity of both krill species when feeding on zooplankton prey. We performed a series of feeding experiments using increasing concentrations of natural phytoplankton (64 taxa; 2 to >50 μm) and mesozooplankton (28 taxa; ~100–2000 μm) assemblages and the latter in presence and absence of phytoplankton. Results revealed that both krill species exhibited a Holling type III feeding response on phytoplankton. However, T. raschii was able to exploit efficiently the highest phytoplankton concentrations. Our experiments highlighted that the presence of phytoplankton modified the functional feeding response on mesozooplankton preys of M. norvegica, but not that of T. raschii. Similarly, the presence of phytoplankton influenced the feeding selectivity on mesozooplankton preys, although both species showed contrasting selectivity patterns. In addition, we estimated the energy needs in relation to the daily rations. T. raschii satisfied its energy needs by feeding either on high phytoplankton concentrations or on low mesozooplankton densities, whereas M. norvegica did not cover its metabolic costs efficiently by feeding on phytoplankton only, even at high phytoplankton concentrations.

Download Full-text

Influence of temperature on clearance and oxygen consumption rates of the flat oyster Ostrea edulis: determination of allometric coefficients

Aquaculture ◽

10.1016/s0044-8486(98)00383-4 ◽

1998 ◽

Vol 169 (3-4) ◽

pp. 211-224 ◽

Cited By ~ 46

Author(s):

J Haure ◽

C Penisson ◽

S Bougrier ◽

J.P Baud

Keyword(s):

Oxygen Consumption ◽

Ostrea Edulis ◽

Influence Of Temperature ◽

Consumption Rates ◽

Influence Of Temperature On ◽

Flat Oyster

Download Full-text

The effect of temperature on high-resolution TEM image contrast

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139573 ◽

1995 ◽

Vol 53 ◽

pp. 640-641

Author(s):

T. Geipel ◽

W. Mader ◽

P. Pirouz

Keyword(s):

Form Factor ◽

Inelastic Scattering ◽

Accurate Method ◽

Waller Factor ◽

Effect Of Temperature ◽

Specimen Thickness ◽

Influence Of Temperature ◽

Debye Waller Factor ◽

Influence Of Temperature On ◽

Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

Download Full-text