The stomach of the harbor porpoise <i>Phocoena phocoena</i> (L.)

Smith, G. J. D.

doi:10.1139/z72-212

Cited by 24 publications

(38 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Pacific white-sided dolphin stomach has a general morphology similar to that of other cetacean stomachs [5,[24][25][26]29]. The superficial layer of the cornified stratified squamous epithelium in the forestomach is morphologically similar to that of the first stomach of ruminants.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Lectin Binding Pattern of Gastric Mucosa of Pacific White-Sided Dolphin, Lagenorhynchus obliquidens

Shimokawa

Doihara

Makara

et al. 2012

The Journal of Veterinary Medical Science

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

“…They feed mostly on small fishes and squids [6,11]. Cetacean stomachs are divided into three sections: forestomach, proper gastric gland portion, and pyloric chamber [1,8,25,26,30,31]. The forestomach is a nonglandular ampulla; both the proper gastric gland portion and pyloric chamber possess specific mucosal glands [5,24,29].…”

mentioning

confidence: 99%

Lectin Binding Pattern of Gastric Mucosa of Pacific White-Sided Dolphin, Lagenorhynchus obliquidens

Shimokawa

Doihara

Makara

et al. 2012

The Journal of Veterinary Medical Science

View full text Add to dashboard Cite

“…First, it has already been noted that most worms were attached. Second, detached worms should be quickly eliminated because evacuation is fast in cetaceans (Smith, 1972). In fact, the low number of individuals found in the RI (mean, 6; median, 1) possibly represents the sum of all senescent worms coming from the MS, PS, and DA.…”

Section: Discussionmentioning

confidence: 99%

Corynosoma cetaceum in the Stomach of Franciscanas, Pontoporia blainvillei (Cetacea): An Exceptional Case of Habitat Selection by an Acanthocephalan

Aznar¹,

Bush²,

Balbuena³

et al. 2001

The Journal of Parasitology

View full text Add to dashboard Cite

Adult acanthocephalans are typically found in the intestine of vertebrates, where they can readily absorb nutrients. However, Corynosoma cetaceum has been frequently reported in the stomach of cetaceans from the Southern Hemisphere. The ecological significance of this habitat was investigated by examining data on number, sex ratio, maturity status, biomass, and fecundity of C. cetaceum in different parts of the digestive tract of 44 franciscanas Pontoporia blainvillei. Individual C. cetaceum occurred in the pyloric stomach (PS) and, to lesser degrees, in the duodenal ampulla (DA) and the main stomach (MS). Females outnumbered males in all chambers, although the sex ratio was closer to 1:1 in the MS; there also was a higher proportion of nongravid females, with a smaller biomass in the MS than in the PS and the DA. This evidence suggests that cystacanths are released from prey tissues in the MS, where entire prey are reduced to semi-fluid chyme. The 3 chambers harbored gravid females that did not differ significantly in mean biomass or fecundity. The maturity status of females was nearly identical between the PS and the DA. In the MS, the higher proportion of non-gravid females is probably due to the occurrence of newly recruited females to this site. Mean biomass and fecundity of gravid females covaried strongly and positively among chambers within hosts. These results suggest that there are no major differences between the 3 chambers with respect to the suitability for reproduction by C. cetaceum. However, although the MS is the largest chamber, it harbored the smallest number of gravid females. Interestingly, worms were largely restricted to the aboral portion of the MS, a sheltered region where a concentration of chyme, and thus nutrient availability, likely occurs. Linear distribution differences of gravid female C. cetaceum at increasing intensities suggest that reproductive females occupy chambers according to available space. In summary, the stomach should be considered the main habitat for C. cetaceum. The choice of this habitat is puzzling because other Corynosoma species occur in the intestine, and because the stomach of cetaceans is not an absorptive site.Adult acanthocephalans inhabit the digestive tracts of vertebrates (Crompton, 1973). The preferred site for most species is the intestine (especially the middle region [Petrochenko, 1956]), apparently due to their requirement for simple nutrients that can be absorbed across the body wall (Crompton, 1973;Starling, 1985). However, some species infecting fish have been recorded in the stomach (Petrochenko, 1956), possibly because the stomach of fish is known to be a region of nutrient absorption (Crompton, 1973). Within the groups of acanthocephalans infecting birds and mammals, only 2 species, both in the genus Corynosoma, have been reported as adults from the stomach. Corynosoma hamanni was mostly found in the duodenum of Antarctic seals, but about 3% of the component population was found in the pyloric region of the stomach (Zdzitowiecki, 1...

show abstract

“…The stomach of cetaceans is generally classified into two types according to the number of ampulla corresponding to the stomach, although there are some exceptions [10]. The representatives of these types are the stomach of dolphins and porpoises (three partitions) [3,12,14] and whales (four partitions) [4,11]. In baleen whales and Minke whales, these partitions are defined as the forestomach, the proper gastric gland portion, the pyloric chamber, and the duodenum ampulla [4] (Fig.…”

mentioning

confidence: 99%

Histological Observation of the Proper Gastric Gland in Minke Whale, Balaenoptera acutorostrata.

Shimokawa

Yamagiwa

Hondo

et al. 2003

The Journal of Veterinary Medical Science

View full text Add to dashboard Cite

ABSTRACT. To accumulate histological information of cetaceans, the proper gastric gland of Minke whales was examined by light and electron microscopic observation. A small number of mucous neck cells and a large number of chief and parietal cells were observed in the gland. At the body to basal portions of the gland, the ratio of chief cells to other cells seemed to be large compared to the n eck portion. Transmission electron microscopy revealed that the chief cell had secretory granules with middle level of electron density, and that the parietal cell contained abundant mitochondria and intracellular canaliculi. The proper gastric gland of the Minke whales may appear to secrete large amounts of digestive enzymes and have high digestive activity. KEY WORDS: Minke whale, parietal cell, proper gastric gland.

show abstract

The stomach of the harbor porpoise Phocoena phocoena (L.)

Cited by 24 publications

References 0 publications

Lectin Binding Pattern of Gastric Mucosa of Pacific White-Sided Dolphin, Lagenorhynchus obliquidens

Lectin Binding Pattern of Gastric Mucosa of Pacific White-Sided Dolphin, Lagenorhynchus obliquidens

Corynosoma cetaceum in the Stomach of Franciscanas, Pontoporia blainvillei (Cetacea): An Exceptional Case of Habitat Selection by an Acanthocephalan

Histological Observation of the Proper Gastric Gland in Minke Whale, Balaenoptera acutorostrata.

Contact Info

Product

Resources

About