THE DIGESTIVE TRACT AND ITS RELATION TO FEEDING HABITS IN THE STENOGLOSSAN PROSOBRANCH CORALLIOPHILA ABBREVIATA (LAMARK)

1965 ◽  
Vol 43 (3) ◽  
pp. 447-464 ◽  
Author(s):  
Jonet Ward
Keyword(s):  
Digestive Tract ◽  
Digestive System ◽  
Feeding Habits ◽  
Histological Study ◽  
Dorsal Side ◽  
Animal Tissue ◽  
Salivary Duct ◽  
Faecal Material ◽  
Montastrea Annularis ◽  
Coralliophila Abbreviata

Coralliophila abbreviata is found on partly eroded colonies of Montastrea annularis in the coastal reefs of Barbados and contributes to the destruction of this coral. The habitat and feeding habits have been examined and a histological study has been made of the digestive system. Stomach and faecal material indicate that both the animal tissue and zooxanthellae are ingested. Enzyme tests demonstrate the presence of protein and carbohydrate digesting enzymes. Since this animal has no radula or jaws, it is thought that the muscular proboscis is used as a pump during the ingestion of food. The single salivary duct, formed from the ducts of the paired salivary glands, opens into the oral tube on the dorsal side of the mouth. It is suggested that its secretion may aid in penetration of the coral epidermis before ingestion begins.

scholarly journals Morphohistology of the Digestive Tract of the Damsel FishStegastes fuscus(Osteichthyes: Pomacentridae)

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Bhaskara Canan ◽  
Wallace Silva do Nascimento ◽  
Naisandra Bezerra da Silva ◽  
Sathyabama Chellappa
Keyword(s):  
Digestive Tract ◽  
Transition Region ◽  
Digestive System ◽  
Feeding Habits ◽  
Northeastern Brazil ◽  
Muscular Layer ◽  
Pyloric Caeca ◽  
Anterior Intestine ◽  
The Mean ◽  
Tidal Pools

This study investigated the morphohistology of the digestive tract and the mean intestinal coefficient of the damsel fishStegastes fuscuscaptured from the tidal pools of Northeastern Brazil. The wall of the digestive tract ofS. fuscusis composed of the tunica mucosa, tunica muscularis, and tunica serosa. The esophagus is short with sphincter and thick distensible wall with longitudinally folded mucosa. Mucous glands are predominant, and the muscular layer of the esophagus presented striated fibers all along its extension. The transition region close to the stomach shows plain and striated muscular fibers. Between the stomach and intestine, there are three pyloric caeca. The intestine is long and thin with four folds around the stomach. The anterior intestine presents folds similar to those of pyloric caeca. The estimated mean intestinal coefficient and characteristics of the digestive system ofS. fuscuspresent morphological adequacy for both herbivorous and omnivorous feeding habits.

The enteric nervous system of echinoderms: unexpected complexity revealed by neurochemical analysis

2001 ◽  
Vol 204 (5) ◽  
pp. 865-873
Author(s):  
J.E. Garcia-Arraras ◽  
M. Rojas-Soto ◽  
L.B. Jimenez ◽  
L. Diaz-Miranda
Keyword(s):  
Nervous System ◽  
Enteric Nervous System ◽  
Digestive Tract ◽  
Radial Nerve ◽  
Digestive System ◽  
Nerve Ring ◽  
Point Of View ◽  
Distinct Component ◽  
Future Studies ◽  
Neurochemical Analysis

Echinoderms are one of the most important groups of metazoans from the point of view of evolution, ecology and abundance. Nevertheless, their nervous system has been little studied. Particularly unexplored have been the components of the nervous system that lie outside the ectoneural and hyponeural divisions of the main nerve ring and radial nerve cords. We have gathered information on the nervous components of the digestive tract of echinoderms and demonstrate an unexpected level of complexity in terms of neurons, nerve plexi, their location and neurochemistry. The nervous elements within the digestive system consist of a distinct component of the echinoderm nervous system, termed the enteric nervous system. However, the association between the enteric nervous system and the ectoneural and hyponeural components of the nervous system is not well established. Our findings also emphasize the importance of the large lacunae in the neurobiology of echinoderms, a feature that should be addressed in future studies.

scholarly journals Occurrence of Tetracampos ciliotheca and Proteocephalus glanduligerus in Clarias gariepinus (Burchell, 1822) collected from the Vaal Dam, South Africa

2013 ◽  
Vol 80 (1) ◽  
Author(s):  
Grace Madanire-Moyo ◽  
Annemariè Avenant-Oldewage
Keyword(s):  
South Africa ◽  
Digestive Tract ◽  
Standard Length ◽  
Feeding Habits ◽  
Clarias Gariepinus ◽  
Male And Female ◽  
Mean Intensity ◽  
Gill Nets ◽  
Larval Stages ◽  
Vaal Dam

Cestodes are parasitic flatworms that live in the digestive tract of vertebrates as adults and often in the liver, muscle, haemocoel, mesentery and brain of various animals as larval stages. To identify the cestodes infecting Clarias gariepinus Burchell, 1822 (sharptooth catfish) in the Vaal Dam, a total of 45 host specimens were collected with the aid of gill nets between October 2011, January and April 2012. The fish were sacrificed and examined for cestode parasites. Two adult cestodes, Tetracampos ciliotheca Wedl, 1861 (prevalence 86.7%, mean intensity = 15, n = 45) and Proteocephalus glanduligerus (Janicki, 1928) (prevalence 51.1%, mean intensity = 5, n = 45) were found in the intestines of the catfish. Both T. ciliotheca and P. glanduligerus are new locality records. There were statistically insignificant differences in the infection of the male and female C. gariepinu. Fish with standard length ranging from 40 cm – 54 cm (≥ 3 years) had the highest prevalence and mean intensity while those ranging from 10 cm – 24 cm (< 1 year) had the lowest prevalence and mean intensity for both cestodes. The study highlights the importance of changing feeding habits of C. gariepinus with age on the prevalence and mean intensity of the two gastrointestinal cestode parasites.

scholarly journals ABO histo-blood groups and Rh systems in relation to malignant tumors of the digestive tract in Bosnia and Herzegovina

2008 ◽  
Vol 60 (4) ◽  
pp. 593-599 ◽  
Author(s):  
Snezana Jovanovic-Cupic ◽  
Gorana Stamenkovic ◽  
Jelena Blagojevic ◽  
N. Vanis ◽  
B. Stanojevic ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Digestive Tract ◽  
Digestive System ◽  
Malignant Tumors ◽  
Blood Groups ◽  
Liver Carcinoma ◽  
Abo Blood Groups ◽  
Rhesus Factor ◽  
Clinical Center ◽  
Group B

The distribution of ABO blood groups and the Rhesus factor was analyzed in 279 patients who suffered from malignant tumors of the digestive system. Patients were registered retrospectively in the Gastroenterohepatology Clinic, Clinical Center, University of Sarajevo over a discontinuous period of 88 months. From the results obtained, it was concluded that: (a) men became ill from gastric cancer significantly more frequently than women; (b) the frequency of liver carcinoma was three times higher than the global frequency and the frequency neighboring ethnic groups; and (c) patients with blood group B and patients with RhD(-) exhibited a significantly higher proportion of disease.

scholarly journals Histological analysis of the tongue, esophagus and crop of Southern Carcará (Polyborus plancus)

2021 ◽  
Vol 10 (2) ◽  
pp. e21410212439
Author(s):  
Vanessa Sobue Franzo ◽  
Leiny Paula de Oliveira ◽  
Ana Carolina Pôssas Viana ◽  
Adriano Tony Ramos ◽  
Jéssica Fernanda Bertolino ◽  
...  
Keyword(s):  
Digestive System ◽  
Histological Analysis ◽  
Squamous Epithelium ◽  
Eating Habits ◽  
Histological Study ◽  
Pekin Ducks ◽  
The Family ◽  
Body Weights ◽  
Stratified Squamous Epithelium ◽  
Hematoxylin Eosin

The Southern Caracara is a bird of prey, of the family Falconidae, inhabits all the Brazilian territory, they are omnivorous birds adapted for hunting. The digestive system of the predators presents differences in their morphology due to their eating habits. Knowing the importance of the gastrointestinal system, this study aims to carry out a histological study of the tongue, esophagus and the crop of Polyborus plancus. For this purpose, eight avian of both sexes, with different body weights and ages were used, they were euthanized and the organs were collected, fixed, dehydrated and stained with hematoxylin-eosin. It was noted that the tongue has stratified squamous epithelium with mucous glands and with different degrees of keratinization. The esophagus and crop have four well developed muscle layers and mucous glands. Additionally, in the crop there is presence of an adventitious layer that consists of loose connective tissue. We conclude that the tongue, the esophagus and the crop of the Southern Caracara have similar histological organization of several birds like the Pekin Ducks, ostriches, domestic chicken and partridges.

scholarly journals Association of the Insulinemic Potential of Diet and Lifestyle With Risk of Digestive System Cancers in Men and Women

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
Weike Wang ◽  
Teresa T Fung ◽  
Molin Wang ◽  
Stephanie A Smith-Warner ◽  
Edward L Giovannucci ◽  
...  
Keyword(s):  
Digestive Tract ◽  
Digestive System ◽  
Cox Regression ◽  
Health Study ◽  
Men And Women ◽  
Dietary Index ◽  
Hazard Ratios ◽  
Incident Cancer ◽  
Men Health ◽  
Diet And Lifestyle

Abstract Background We examined the role of the insulinemic potential of diet and lifestyle in the development of cancers of the digestive system, using two plasma C-peptide-based indices: the empirical dietary index for hyperinsulinemia (EDIH) and empirical lifestyle index for hyperinsulinemia (ELIH). Methods We used Cox regression to analyze data on 45 816 men (Health Professionals Follow-up Study, 1986–2012) and 74 191 women (Nurses’ Health Study, 1984–2012) to examine associations between EDIH and ELIH scores and digestive system cancers. We computed the diet-only score (EDIH) from food-frequency questionnaires administered every 4 years. The lifestyle score (ELIH) included diet, body mass index, and physical activity. Outcomes included incident cancer of the digestive system (mouth, throat, esophagus, stomach, small intestine, and colorectum) and its accessory organs (pancreas, gallbladder, and liver). P values were two-sided. Results We found direct associations between higher insulinemic potential of diet or lifestyle and risk of developing digestive system cancers in both men and women. The pooled multivariable hazard ratios (HRs) for participants comparing the highest to lowest EDIH quintile were: HR = 1.27, 95% confidence interval (CI) = 1.15 to 1.40, Ptrend < .001 for digestive system cancers; HR = 1.30, 95% CI = 1.17 to 1.45, Ptrend < .001 for digestive tract cancers (excluding accessory organs); and HR = 1.15, 95% CI = 0.93 to 1.41, Ptrend = .48 for digestive accessory organ cancers. The same associations were stronger with the lifestyle score: HR = 1.47, 95% CI = 1.23 to 1.76, Ptrend < .001 for digestive system cancers; HR = 1.49, 95% CI = 1.14 to 1.95, Ptrend = .001 for digestive tract cancers; and HR = 1.43, 95% CI = 1.17 to 1.73, Ptrend < .001 for digestive accessory organ cancers. Conclusions The findings suggest that interventions to reduce the insulinemic potential of diet and lifestyle may be a means of preventing digestive system cancer.

X.—On the Feeding Mechanism of a Mysid Crustacean, Hemimysis Lamornæ

1927 ◽  
Vol 55 (1) ◽  
pp. 219-253 ◽  
Author(s):  
H. Graham Cannon ◽  
S. M. Manton
Keyword(s):  
Digestive System ◽  
Feeding Habits ◽  
Great Length ◽  
Gastric Mill ◽  
General Biology ◽  
Feeding Mechanism ◽  
In Captivity ◽  
Fish Tanks

The general biology of the Mysids has recently been studied at great length by Blegvad (1922) at Copenhagen. His paper, containing a very complete literature list, deals with Mysis inermis, Rathke, Mysis flexuosa, Müller, and Mysis neglecta, Sars. His comments on feeding are limited, and refer chiefly to the nature of the food that the animals ate in captivity. Gelderd's work (1909) on the digestive system of the Schizopoda describes the course taken by the food through the gastric mill, the masticatory functions of this apparatus, and the method by which the masticated food and digestive juices are brought together, but does not deal with the manner in which the food reaches the stomach. An account, then, of the method by which a mysid collects its food would fill a gap in our knowledge of these forms. The only description, as far as we are aware, of the feeding habits of a mysid is that of Depdolla (1923), who worked on Praunus [Mysis] flexuosus, but his account is superficial and in our opinion very inaccurate. The following paper deals with the feeding habits of a small mysid, Hemimysis lamornœ, about 8 mm. long, which has established itself in the larger fish-tanks at the M.B.A. laboratory at Plymouth. It breeds freely all the year round, and can be obtained from the tanks in abundance, although it is stated to be only a rare visitor in the Plymouth district.

IX.—The Structure and Function of the Alimentary Canal of Æolid Molluscs, with a Discussion on their Nematocysts

1938 ◽  
Vol 59 (2) ◽  
pp. 267-307 ◽  
Author(s):  
Alastair Graham
Keyword(s):  
Alimentary Canal ◽  
Digestive System ◽  
Feeding Habits ◽  
Structure And Function ◽  
Gastropod Mollusc ◽  
Food And Feeding ◽  
The Moment ◽  
Almost All ◽  
And Function ◽  
Great Advance

During recent years there has been a very great advance in our knowledge of the minute structure and function of the various regions and glands of the alimentary canal of the prosobranch and pulmonate gastropods, without any corresponding increase in our understanding of the opisthobranch and, in particular, of the nudibranch gut. That the emphasis should be laid on the streptoneurous and the land-living forms is obviously due to their abundance and to the fact that they include almost all the familiar types of gastropod mollusc, but it is disappointing that, at the moment of writing, there exists only one account of the histology and function of the digestive system of either a dorid or an æolid—to confine attention to the two main types of nudibranch molluscs which occur in British waters—that of Millott (1937b). This is perhaps more noticeable when it is recalled that the nudibranchs have specialised along distinctly unusual lines, many of which are intimately associated with the food and feeding habits which the animals have adopted. The æolids, it is true, have attracted a lively interest in connexion with their possession of nematocysts, but the majority of investigators have apparently been content to trace these into the cnidosacs without concerning themselves over the other constituents of the animal's food.

The importance of the gastropod Coralliophila abbreviata (Lamarck) and the polychaete Hermodice carunculata (Pallas) as coral reef predators

1972 ◽  
Vol 50 (12) ◽  
pp. 1651-1656 ◽  
Author(s):  
Bruce Ott ◽  
John B. Lewis
Keyword(s):  
West Indies ◽  
Coral Tissue ◽  
Living Coral ◽  
Porites Astreoides ◽  
Reef Corals ◽  
Porites Porites ◽  
Hermodice Carunculata ◽  
Montastrea Annularis ◽  
The Mean ◽  
Coralliophila Abbreviata

The importance of the stenoglossan prosobranch gastropod Coralliophila abbreviata (Lamarck) and the amphinomid errant polychaete Hermodice carunculata (Pallas) as coral predators in Barbados, West Indies, was investigated. Coralliophila normally feeds upon the coral Montastrea annularis (Ellis and Solander), can consume up to 9 cm2 of tissue in 24 h, and has a mean density of 13 individuals per square meter of living coral in shallow water. Hermodice normally feeds upon the zooanthid Palythoa mammillosa (Ellis and Solander) and the corals Porites porites (Pallas) and Porites astreoides Lamarck. The mean density of Hermodice was less than one individual per square meter of surface of living prey and large worms could consume up to 3 cm2 of living coral tissue in a 3-h feeding period. Because of the low densities of the predators the preference of Hermodice for the zooanthid Palythoa and the fact that Coralliophila feeds only rarely, they did not cause extensive damage to reef corals.

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