Rates of ingestion and their variability between individual calanoid copepods: direct observations

Paffenhöfer, Gustav‐Adolf; Bundy, M. H.; Lewis, K.D.; Metz, Cornelia

doi:10.1093/plankt/17.7.1573

Cited by 32 publications

(7 citation statements)

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“…This value is higher than that reported for the equatorial Pacific (47%) (Zhang et al 1995), but agrees with the variations found in the grazing pressure (between 35 and 68%) (Sautour et al 1996) with high variability (5-100%) (Perissinotto 1992). On the other hand, some studies (Paffenhöfer et al 1995) have shown feeding rates similar to our calculated grazing pressure (35%-65%, V.C.= 57%). Feeding rate can be considered an estimate of grazing pressure because both are influenced by size, concentration, food quality (De Mott 1988, Kleppel 1993 and clearance rate, which varies with feeding characteristics of the herbivorous species (Paffenhöfer 1988).…”

Section: Phyto-zooplankton Couplingsupporting

confidence: 91%

Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event

Brugnoli-Olivera¹,

Moráles-Ramírez

2008

Rev. biol. mar. oceanogr.

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Resumen.-Durante las épocas seca y lluviosa de 1997 se analizó la dinámica trófica del plancton en el Golfo de Nicoya, costa Pacífica de Costa Rica. En dos profundidades de penetración de luz se determinaron la temperatura del agua, salinidad y oxígeno disuelto. En cada profundidad se cuantificaron los nutrientes inorgánicos, biomasa fitoplanctónica total y nanofitoplanctónica, recolectándose muestras para análisis taxonómicos fitoplanctónicos. Se realizaron arrastres oblicuos para estimar abundancias, composición y peso seco del zooplancton. La estimación indirecta de la tasa de herbivoría se realizó utilizando el presupuesto de pigmentos. El estudio coincidió con la ocurrencia de un evento El Niño reflejado en cambios de las características físico-químicas del agua en la zona de Punta Morales. La concentración de algunos nutrientes mostró una correlación con la salinidad y se encontraron diferencias significativas entre las épocas transición y lluviosa en las biomasas fitoplanctónicas. Se identificó un total de 43 taxa fitoplanctónicos, donde flagelados, diatomeas céntricas y pennadas representaron el 90% de la abundancia. Los copépodos fueron el grupo zooplanctónico más abundante y Acartia lilljeborgii, Pseudodiaptomus sp. y Paracalanus parvus, los herbívoros dominantes; los valores del peso seco de herbívoros varió entre 0,6 y 50 mg m -3 . La tasa de herbivoría mostró un promedio de 0,67 ± 0,83 d -1 . Se encontró un comportamiento estacional con cambios en las concentraciones de nutrientes, disponibilidad del fitoplancton e incremento de las temperaturas, donde la predación y presión de herbivoría ocasionaron cambios en la estructura de las poblaciones planctónicas en la zona interna del Golfo de Nicoya.Palabras clave: Plancton, tasa de herbivoría, Océano Pacífico Abstract.-The trophic dynamics of the plankton from the Gulf of Nicoya, a tropical estuary in the Pacific coast of Costa Rica, was conducted during dry and rainy seasons of 1997. Water temperature, oxygen and salinity were measured at two different light penetration depths. Inorganic nutrients, total and nannophytoplanktonic chlorophyll a were determined at each depth and additional samples were taken for phytoplankton taxonomic work. Oblique zooplankton hauls were done and abundance, composition and dry weight of zooplankton were determined. Indirect grazing rate estimate was calculated using the pigment budget. The study period coincided with an El Niño event detected in the Punta Morales zone and reflected by a change in the physico-chemical water characteristics. Some nutrient concentrations were correlated to the salinity, and significant differences were observed between the transition and rainy seasons in the phytoplankton biomass of the two fractions. A total of 43 phytoplankton taxa were identified and flagellates, centric and pennate diatoms represented 90% of the total phytoplankton abundance. In the zooplanktonic samples, copepods were the most abundant group and Acartia lilljeborgii, Pseudodiaptomus sp. and Paracalanus parvus were the ...

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Section: Phyto-zooplankton Couplingsupporting

confidence: 91%

Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event

Brugnoli-Olivera¹,

Moráles-Ramírez

2008

Rev. biol. mar. oceanogr.

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“…In the present experiments, the maximum number of cells consumed per second varied from 0.5 for Oithona simp l e~ to 1.5 for Parvocalanus crassirostns and 0. nana, assuming continuous grazing. The existence of feeding rhythms (Fuller 1937, Petipa 1958, Dagg & Grill 1980, Haney 1988, Saito & Taguchi 1996, discontinuities in the grazing (Cowles & Strickler 1983, Price & Paffenhijfer 1986, Jonsson & Tiselius 1990, Saiz 1994) and active rejection of cells (Paffenhofer et al 1995) implies that the number of cells handled per animal per second of active feeding was even higher. In addition, ingestion rates may appear to slow down, when quantified as cells copepod-' d-l, because copepods may take longer to handle the larger cells that became more prevalent as the concentration of nanoplankton increased.…”

Section: Patterns Of Food Selectionmentioning

confidence: 99%

Copepod grazing in a subtropical bay:species-specific responses to a midsummer increase in nanoplankton standing stock

Calbet¹,

Landry²,

Scheinberg³

2000

Mar. Ecol. Prog. Ser.

110

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Ingestion rates of 4 small copepod species (Oithona simplex, 0. nana. Acrocalanus inermis and Parvocalanus crassirostris) were investigated in Kaneohe Bay, Hawaii, during a nudsummer increase of the pico-and nanoplankton communities. There was no evidence that adult female copepods fed significantly on picoplankton-sized cells. However, all the species responded behaviorally to variations in the concentration (10 to 110 pg C 1-l) and size spectrum (relative increase of cells > 5 pm) of nanoplankton prey. The copepods generally behaved as opportunistic particle feeders, demonstrating higher consumption rates on the most abundant cells (2-5 pm nanoplankton); however, autotrophs were usually selected over heterotrophs of simdar size. Max~murn ingestion rates were similar for the 2 calanoids and 0. nana (around 120000 cells copepod-' d-') and lower for 0. simplex (around 40000 cells copepod-' d-l), but biomass-specific rates of 0. simplex equaled those of the other species. At the highest nanoplankton concentrations, the ingestion rates of copepods appeared saturated, daily rations ranging from 100% body C d-' for A, rnermis to 260% body C d-l for P crassirostris. The differences between ingestion rates measured as cells per copepod per day and those converted to carbon suggested that ingestion might be held below potential by the cumulahve handLing times of individual prey rather than the physioloqcal constraints of food consumption and digestive processing.

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“…evidence of the ingestion of protozoans comes, mostly, from predation experiments done in situ or in the laboratory (Paffenhöfer et al, 1995), through the use of biomarkers (kivi & setala, 1995; li et al, 1996), filming (Verity & Paffenhöfer, 1996), or through identification of hard parts such as loricae and skeletal material in gut contents or in fecal pellets (conover, 1982). a previous investigation (eskinazi-sant'anna, 2000) showed that the protozoan S. zanclea forms Braz.…”

Section: Introductionmentioning

confidence: 99%

Sticholonche zanclea (Protozoa, Actinopoda) in fecal pellets of copepods and Euphausia sp. in Brazilian coastal waters

Eskinazi-Sant’Anna

2006

Braz. J. Biol.

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Fecal pellets produced by mesozooplanktonic copepods (Centropages velificatus and Paracalanus parvus) and macrozooplanktonic Euphausiacea (Euphausia sp.) were examined using scanning electron microscopy. Fragments of the protozoan Sticholonche zanclea were found in both copepod and in Euphausia sp. fecal pellets, even when the abundance of the protozoan in the water was low. The results suggest that S. zanclea is an important food resource for different trophic levels, including meso- and macrozooplankton, in Brazilian coastal waters.

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Rates of ingestion and their variability between individual calanoid copepods: direct observations

Cited by 32 publications

References 0 publications

Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event

Trophic planktonic dynamics in a tropical estuary, Gulf of Nicoya, Pacific coast of Costa Rica during El Niño 1997 event

Copepod grazing in a subtropical bay:species-specific responses to a midsummer increase in nanoplankton standing stock

Sticholonche zanclea (Protozoa, Actinopoda) in fecal pellets of copepods and Euphausia sp. in Brazilian coastal waters

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