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

Paffenhoefer, G.A.; Lewis, K.D.; Bundy, M. H.; Metz, Cornelia

doi:10.2172/161058

Cited by 4 publications

(6 citation statements)

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“…Tseitlin (1994) has shown that the interpretation of such pooled data could become unreliable because of individual differences. A number of studies have addressed this issue resulting in a better appreciation for the variability in individual feeding behavior (e.g., Turner et al 1993, Paffenhöffer 1994, Paffenhöffer et al 1995. However, we still lack a good understanding of the gut dynamics that take place between ingestion and evacuation.…”

Section: Discussionmentioning

confidence: 99%

“…Paffenhöffer (1994) looked at the variability in the duration between defecation intervals of tethered individuals, which he argued were an indicator of feeding activity. However, in a later study, Paffenhöffer et al (1995) tracked and filmed free-swimming copepods, recording ingested cell numbers and pellet evacuation intervals. They found that variability in ingestion rate was greater than that of pellet evacuation rate.…”

Section: Assessmentmentioning

confidence: 99%

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Copepod feeding quantified by planar laser imaging of gut fluorescence

Karakoylu

Franks

Tanaka

et al. 2009

Limnology & Ocean Methods

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We present a new method for quantifying the feeding of individual copepods, using a planar sheet of laser light to stimulate the fluorescence of phytoplankton ingested by the copepod. The fluorescence is imaged with a sensitive CCD camera, giving two-dimensional images of the copepod's gut with 20 × 20 μm spatial resolution. Using tethered copepods, we have obtained > 3 h long time series of copepod gut fluorescence with images every 15-20 s. The same individual copepod can be used for multiple experiments, obviating the problems of individual variability as a source of error. Initial data reveal two distinct patterns of variability as material moves through two functionally different gut compartments. These patterns reflect processes occurring in each compartment. The upper (anterior) mid-gut shows higher variability and less repeatability than the posterior midgut where undigested material is aggregated into a fecal pellet and evacuated at regular intervals. Variability in the upper mid-gut is likely due to factors such as intermittence of feeding and relatively complex mixing dynamics. In the posterior mid-gut, mixing dynamics are much simpler, and the variability of the upper compartment is integrated over the time scale of pellet formation.

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Section: Discussionmentioning

confidence: 99%

Section: Assessmentmentioning

confidence: 99%

Copepod feeding quantified by planar laser imaging of gut fluorescence

Karakoylu

Franks

Tanaka

et al. 2009

Limnology & Ocean Methods

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“…Paffenhöfer et al (1995) showed that copepod species are even able to perceive food particles at a distance using chemoreceptors, indicating that chemical substances released from food particles play a crucial role in copepod feeding behavior. Laboratory feeding experiments to date indicated that copepods tend to avoid feeding on dinoflagellates that produce paralytic shellfish toxins when non-toxic, alternative food items are available (e.g., Huntley, 1982;Turriff et al, 1995;Teegarden, 1999).…”

Section: Discussionmentioning

confidence: 99%

Effects of Protoceratium reticulatum yessotoxin on feeding rates of Acartia hudsonica: A bioassay using artificial particles coated with purified toxin

et al. 2008

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“…This will parallel research in the laboratory (e.g. Paffenhofer et al, 1996). The system will be deployed from research ships -life in the closed vessel will not be affected by the motions of the ship nor by the fact that it is restricted for ten minutes.…”

Section: Case 2: Observing Large Volumesmentioning

confidence: 99%

“…When out-of-focus images of algae vanish close to the animals and do not appear again one has to assume that the algae have been captured and eaten {e.g. Paffenhofer et al, 1996).…”

Section: Spatial Filtering and Matched Filtersmentioning

confidence: 99%

Matched Spatial Filters in Long Working Distance Microscopy of Phase Objects

Strickler¹

1999

Focus on Multidimensional Microscopy

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For the observation of macroscopic and microscopic life in aquatic and marine environments we treat the animals and algae as phase objects. The combination of a collimated light beam with a spatial filter and a matched filter in the focal planes allow us to image even the most transparent objects. We illustrate the capabilities of our optical designs with three cases: the Schlieren observations of swimming tracks of planktonic animals, the observations in three-dimensions of the swimming behavior of mating copepods, and the observations of planktonic and benthic life in situ. We discuss the basics of our design and suggest further technical developments.

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

Cited by 4 publications

References 0 publications

Copepod feeding quantified by planar laser imaging of gut fluorescence

Copepod feeding quantified by planar laser imaging of gut fluorescence

Effects of Protoceratium reticulatum yessotoxin on feeding rates of Acartia hudsonica: A bioassay using artificial particles coated with purified toxin

Matched Spatial Filters in Long Working Distance Microscopy of Phase Objects

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