Effects of Size and Concentration of Food Particles on the Feeding Behavior of the Marine Planktonic Copepod Calanus Pacificus
نویسنده
چکیده
When adult females of Calanus pacificus are fed on monospecific cultures of centric diatoms which grow as single cells, a predictive relationship is found between feeding behavior of the copepods and size and concentration of food particles. Ingestion rate of copepods increases linearly with cell concentration up to a maximal rate. This maximal ingestion rate, expressed as carbon, is the same for copepods feeding on diatoms ranging in diameter from 11-87 P. As the size of food particles increases, the carbon concentration at which this ingestion rate is achieved decreases. Thus females of C. pacificus can obtain their maximal daily ration at relatively low carbon concentrations
منابع مشابه
Induction of reproductive failure in the planktonic copepod Calanus pacificus by diatoms
The inhibitory effect of diatoms upon egg viability was investigated by feeding the planktonic copepod Calanus pacificus (collected in coastal waters off Oregon. USA) 3 diatom species (Chaetoceros difficilis, Ditylurn brightweh, isolated from Oregon coastal waters, and Thalassiosira weissflogii, from culture collections at Oregon State University) ad libitum (2.6 to 3.9 mg C I-'). These diatoms...
متن کاملImpacts of copepods on marine seston, and resulting effects on Calanus finmarchicus RNA:DNA ratios in mesocosm experiments
We investigated the impact of copepods on the seston community in a mesocosm set-up, and assessed how the changes in food quantity, quality and size affected the condition of the grazers, by measuring the RNA:DNA ratios in different developmental stages of Calanus finmarchicus. Manipulated copepod densities did not affect the particulate carbon concentration in the mesocosms. On the other hand,...
متن کاملFood and feeding habits of Indian mackerel (Rastrelliger kanagurta) in the southern part of Qeshm Island, Persian Gulf
The study investigated the stomach contents of Indian mackerel (Rastrelliger kanagurta) from the southern part of Qeshm Island in the Persian Gulf from April 2016 through March 2017. The food and feeding behavior of R. kanagurta with a fork length of 17.8 to 22.5 cm was assessed from the analysis of gut contents. The frequency of occurrence and numeric methods were used for stomach content anal...
متن کاملCopepod feeding currents: Food capture at low Reynolds number1
High-speed motion pictures of dye streams around feeding Calanoid copepods revealed that these important planktonic herbivores do not strain algae out of the water as previously described. Rather, a copepod flaps four pairs of feeding appendages to propel water past itself and uses its second maxillae to actively capture parcels of that water containing food particles. The feeding appendages of...
متن کاملQuantifying marine snow as a food choice for zooplankton using stable silicon isotope tracers
Aggregates of biogenic origin >0.5 mm, known as marine snow, represent a concentrated potential source of food for zooplankton. Little is known, however, about whether aggregates are commonly grazed by zooplankton in the field. While previous laboratory studies have shown that the euphausiid Euphausia pacifica, and the copepod, Calanus pacificus, common crustacean zooplankters, consume marine s...
متن کامل