Structure et ultrastructure comparées de l'intestin chez plusieurs espéces de Copépodes Calanoides (Crustacea)

Arnaud, J.; Brunet, Michel; Mazza, Jacques

doi:10.1007/bf00998123

Cited by 34 publications

(23 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…While the R-cells with lipid inclusions are known in copepods, as in calanoids (Arnaud et al 1980, Nishida et al 1991, poecilostomatoids (Briggs 1977) and harpacticoids (Sullivan & Bisalputra 1980, Yoshikoshi 1980, the large amount of lipids seen in Cephalophanes spp. appears to be more or less limited to particular groups such as some deep-sea copepods (S.N.…”

Section: Midgut Structure and Contentsmentioning

confidence: 99%

Functional morphology and food habits of deep-sea copepods of the genus Cephalophanes (Calanoida: Phaennidae): perception of bioluminescence as a strategy for food detection

Nishida

Ohtsuka²,

Parker³

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Deep-sea copepods of the genus Cephalophanes are characterised by their large eyes with semi-parabolic reflectors, but their ultrastructure and ecological significance have rarely been investigated. We examined the structure of the eyes, feeding appendages and digestive tract, and the gut contents of Cephalophanes spp., collected from deep-waters (500 to 1000 m) of the subtropical western Pacific, through light and electron microscopic observations. The optic system of Cephalophanes spp. involves a pair of large, bilateral reflectors, each having anteriorly 2 dorso-ventrally arranged retinal cells and 1 more pair of retinal cells positioned posterior to each reflector. The reflector has a multilayer structure of thin (60 to 180 nm at the posterior end) plates decreasing in thickness from the inner to the outer sides of the reflector; the number of plates is ca. 10 to 20 near the anterior margin of the reflector, increasing posteriorly, and reaching ca. 80 near the apex of the reflector. The reflector provides a high (80 to 90%) reflectance over a wide range of wavelengths (350 to 700 nm) of incident light parallel to the reflector axis. The mandible gnathobase has thin blades arranged in parallel, and the setae on the gnathobase of the first maxilla and on the second maxilla and the maxilliped are slender with sparse setules, suggesting feeding on relatively large, inactive particles. In 27 out of the 101 specimens examined, a pear-shaped mass of unknown origin occupied the whole lumen of the well-defined anterior caecum of the midgut. In 25 of these 27 specimens, the lumen of the middle part of the midgut contained fragments of crustaceans, but essentially no other constituents of 'marine-snow' such as phytoplankton, protista, or other nanoplankton. Of the other 74 specimens examined, 97% had empty midguts. These observations suggest a specialization of the anterior midgut caecum for chitin digestion and a possible detection by Cephalophanes spp. of optical signals from crustacean carcasses, a nutritionally poor but ubiquitous food source in the deep sea.

show abstract

Section: Midgut Structure and Contentsmentioning

confidence: 99%

Functional morphology and food habits of deep-sea copepods of the genus Cephalophanes (Calanoida: Phaennidae): perception of bioluminescence as a strategy for food detection

Nishida

Ohtsuka²,

Parker³

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…[4][5][6][7][8][9][10] One of the most remarkable features of the midgut of Ps. spinosus is the absence of the vacuolar cells.…”

Section: Disscusionmentioning

confidence: 99%

Ultrastructure of the Midgut Cells of Some Parasitic Copepods with Special Reference to the Secretion of Digestive Enzymes.

Yoshikoshi¹,

Kô²

1991

NIPPON SUISAN GAKKAISHI

View full text Add to dashboard Cite

“…For our analyses, the mid-gut was divided into two distinct compartments (Gauld 1957;Dagg and Wyman 1983;Penry and Frost 1990). The first spans mid-gut zones I and II (Arnaud et al 1980), designated here as the 'upper mid-gut' or UMG. The second is the posterior mid-gut (zone III, op.…”

Section: Materials and Proceduresmentioning

confidence: 99%

Copepod feeding quantified by planar laser imaging of gut fluorescence

Karakoylu

Franks

Tanaka

et al. 2009

Limnology & Ocean Methods

View full text Add to dashboard Cite

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.

show abstract

Structure et ultrastructure comparées de l'intestin chez plusieurs espéces de Copépodes Calanoides (Crustacea)

Cited by 34 publications

References 29 publications

Functional morphology and food habits of deep-sea copepods of the genus Cephalophanes (Calanoida: Phaennidae): perception of bioluminescence as a strategy for food detection

Functional morphology and food habits of deep-sea copepods of the genus Cephalophanes (Calanoida: Phaennidae): perception of bioluminescence as a strategy for food detection

Ultrastructure of the Midgut Cells of Some Parasitic Copepods with Special Reference to the Secretion of Digestive Enzymes.

Copepod feeding quantified by planar laser imaging of gut fluorescence

Contact Info

Product

Resources

About