Food selection capabilities of the estuarine copepod Acartia clausi

Donaghay, Percy L.; Small, Lawrence F.

doi:10.1007/bf00390421

Cited by 146 publications

(87 citation statements)

References 18 publications

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“…The "taste" of particulate food has been shown to affect the grazing rate of copepods (Ryther 1954;Mullin 1963;Poulet and Marsot 1978;Donaghay and Small 1979). Phytoplankton excrete more dissolved organic carbon substances in the dark and under culture shock (Sharp 1977), which over 24 h of incubation would affect: the nutritional quality of the phytoplankton and possibly reduce the copepod grazing rate.…”

Section: Discussionmentioning

confidence: 99%

“…The longer seawater is enclosed in a jar, the greater is the deviation of the quantity and quality of the suspended particulate material from its original state; thus the shortest period for which grazing differences between control and experimental jars can be measured should be used. Controls can be improved by adding nutrients in excess to both experimental and control jars to reduce the effect of nutrient regeneration by copepods (Bartram 1980;Donaghay and Small 1979;Paffenhofer pers. comm.…”

Section: Discussionmentioning

confidence: 99%

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Containment effects in copepod grazing experiments: A plea to end the black box approach1

Roman

Rublee

1980

Limnology & Oceanography

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Containment effects from enclosing unfiltered seawater and copepods in 500-ml jars to estimate grazing rate were examined six times during 48-h incubations.Crazing rates decreased rapidly for the first 3 h (up to 50%) and then continued to decrease at slower rates. The number of bacteria increased in both control and experimental jars. Variable but significant changes were found in the size distribution of particles and concentrations of adenosine triphosphate and chlorophyll a. Ammonia concentrations were higher in jars with copepods. After 24 h, grazing rates calculated from control jars with NH4+ additions to simulate copepod excretion were about twice those calculated from unamended controls. The grazers removed 2% of the 3-5-pm particles compared to unamended controls and 17% compared to control jars plus NH4+.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Containment effects in copepod grazing experiments: A plea to end the black box approach1

Roman

Rublee

1980

Limnology & Oceanography

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“…The detritus that I used was of about the same size as T. weissjlogii, yet at the same carbon concentration, A. tonsa ingested more diatom carbon than detrital carbon. This difference may have resulted from greater postcapture rejection of the detritus particles (Donaghay and Small 1979), an acclimation period to detritus (24 h) that was not sufficient for inducible enzyme synthesis (Conover 1978), or a greater chemical feedback from ingested diatom cells (Poulet and Marsot 1978). Chemoreception of the algal cells at a greater distance from the copepod may increase the encounter probability;…”

Section: Discussionmentioning

confidence: 99%

“…Richman and Rogers 1969;Frost 1972;Donaghay and Small 1979;Price et al 1983). The detritus that I used was of about the same size as T. weissjlogii, yet at the same carbon concentration, A. tonsa ingested more diatom carbon than detrital carbon.…”

Section: Discussionmentioning

confidence: 99%

Utilization of detritus by the copepod, Acartia tonsa1

Roman

1984

Limnology & Oceanography

172

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Ingestion, survivorship, and growth experiments were conducted with the marine Calanoid copepod, Acartia tonsa, various concentrations of the diatom, Thalassiosira weissjlogii, and detritus derived from the macrophyte, Thalassia testudinum. Copepod ingestion rates of detritus increased with detritus concentration from ~50 to > 1,700 pg Celiter-I.Copepod survival in detritus suspensions was significantly greater than in filtered seawater controls. The instantaneous mortality coefficient, z, of A. tonsa was a linear (negative) function of the diatom concentration (r2 = 0.783 1). When T. weissfrogii suspensions were supplemented with detritus

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“…Frost 1972), phytoplankton over plastic beads (e.g. Donaghay and Small 1979), motile over non-motile cells (e.g. Atkinson 1995) or phytoplankton over detritus (e.g.…”

Section: Introductionmentioning

confidence: 99%

Feeding rates and selectivity among nauplii, copepodites and adult females of Calanus finmarchicus and Calanus helgolandicus

Meyer

Irigoien

Graeve

et al. 2002

Helgoland Marine Research

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This study focuses on selective feeding by developmental stages of two oceanic copepods, Calanus finmarchicus and Calanus helgolandicus from nauplii to adults. A mixture of four algal species of different biochemical composition, Prorocentrum nanum (dinoflagellate), Thalassiosira minima (diatom), Rhodomonas baltica (cryptophyte) and Dunaliella tertiolecta (chlorophyte), added in an equal biovolume, was used in three different experimental set-ups. In set-up 1 the algal species were present as single cells of similar size (14 µm). In set-up 2 the diatom T. minima was present in chains of two or three cells and was therefore larger than the other algae, while the biovolume of all species remained the same. In set-up 3, the diatom T. minima was excluded from the mixture. Feeding selectivity of the copepods was assessed in relation to the quality of the algal species expressed in terms of carbon and nitrogen content, fatty acid composition, and chain length of the diatom. The results show that younger stages and adult females of C. finmarchicus and C. helgolandicus did not show a preference for an algal species when the algae were of similar size. In the feeding experiments where the diatoms were offered as chains, both copepod species showed a selective behaviour only on the basis of algal size. Individual ingestion rates increased from 0.4 to 0.7 µg C day -1 for nauplii of both species to 5 µg C day -1 for adult females of C. helgolandicus to 12 µg C day -1 for C. finmarchicus. Individual filtration rates ranged from 5 ml day -1 for C. finmarchicus nauplii to 70-98 ml day -1 for adult females, and from 3 ml day -1 for C. helgolandicus nauplii to 35-46 ml day -1 for adult females. Ingestion and filtration rates per unit body carbon decreased gradually in both copepod species with increasing body carbon. The daily ingested amount of food decreased for C. finmarchicus from 124-134% of the body carbon for nauplii to 19% of the body carbon for adult females, and for C. helgolandicus from 117-137% of the body carbon for nauplii to 13-26% of the body carbon of adult females.

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Food selection capabilities of the estuarine copepod Acartia clausi

Cited by 146 publications

References 18 publications

Containment effects in copepod grazing experiments: A plea to end the black box approach1

Containment effects in copepod grazing experiments: A plea to end the black box approach1

Utilization of detritus by the copepod, Acartia tonsa1

Feeding rates and selectivity among nauplii, copepodites and adult females of Calanus finmarchicus and Calanus helgolandicus

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