Gut Passage Rate in Guenons and Mangabeys: Another Indicator of a Flexible Feeding Niche?

1993 ◽  
Vol 61 (1) ◽  
pp. 35-37 ◽  
Author(s):  
Fiona Maisels
Keyword(s):  
Passage Rate ◽  
Gut Passage ◽  
Feeding Niche ◽  
Gut Passage Rate

Digesta Passage Times in the Dugong

1995 ◽  
Vol 43 (2) ◽  
pp. 119 ◽  
Author(s):  
JM Lanyon ◽  
H Marsh
Keyword(s):  
Food Intake ◽  
Digestive Tract ◽  
Fibre Material ◽  
Passage Rate ◽  
The West ◽  
Herbivorous Mammals ◽  
Digesta Passage ◽  
West Indian Manatee ◽  
Gut Passage Rate ◽  
Passage Times

The retention times of particulate digesta were measured in two captive dugongs, Dugong dugon (Muller 1776) using inert plastic markers. The mouth-to-anus retention times (146-166 h) were similar to those of the West Indian manatee, and much longer than those of most other herbivorous mammals. This slow gut passage rate may be explained by the dugong's long digestive tract, the low fibre level of the diet and the low food intake. Like the manatee, the dugong appears to have a digestive strategy that is atypical of hindgut fermenters: low-fibre material is retained for extended periods within the long hindgut and almost completely digested.

Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus, in an Alaskan Arctic Lake

1985 ◽  
Vol 42 (3) ◽  
pp. 483-487 ◽  
Author(s):  
Anne E. Hershey ◽  
Michael E. McDonald
Keyword(s):  
Dry Weight ◽  
Age And Growth ◽  
Quadratic Model ◽  
Gut Contents ◽  
Growth Data ◽  
Passage Rate ◽  
Cottus Cognatus ◽  
Gut Passage ◽  
Slimy Sculpin ◽  
Toolik Lake

In arctic Toolik Lake, slimy sculpin (Cottus cognatus) rely on a diet of larval chironomids (Diptera: Chironomidae). Dry weight of sculpin gut contents was not correlated with fish wet weight. This finding, combined with age and growth data, suggested that sculpin may be food limited in Toolik Lake, particularly as they approach reproductive size. Since three taxonomically distinct chironomids were digested at similar rates, one chironomid species was used as a marker to measure gut passage. Gut passage rate as a function of temperature fits an inverse quadratic model slightly better than a negative exponential model. Sculpins took approximately 1 d to digest food at typical summer temperatures (8–16 °C), but approximately 2 d at a typical winter temperature (4 °C). Since winter is three times longer than summer, winter feeding by sculpins may have greater impact on chironomid density than summer feeding. If sculpin are important in the diet of other Toolik Lake fishes, they may serve as an important trophic link between benthic and pelagic production.

Dietary overlap and food resource partitioning among fish species of a tropical estuary in Northeastern Brazil

Gaia Scientia ◽  
2016 ◽  
Vol 10 (4) ◽  
pp. 86-95 ◽  
Author(s):  
Adna Ferreira da Silva Garcia ◽  
Ana Lúcia Vendel
Keyword(s):  
Resource Partitioning ◽  
Species Coexistence ◽  
Food Resource ◽  
River Estuary ◽  
Niche Overlap ◽  
Northeastern Brazil ◽  
Dietary Overlap ◽  
Feeding Niche ◽  
Tropical Environments ◽  
Food Resource Partitioning

The current work investigates dietary overlap and food partitioning among nine abundant carnivorous fishes caught in the shallow waters of the Paraíba do Norte river estuary, Paraíba State, Brazil. Fishes were sampled with a beach seine net between January and December 2008 and a total of 958 specimens had their stomach content analyzed. Crustacea was the dominant food resource for Lutjanus alexandrei, L. jocu and Bathygobius soporator, whereas Telostei were consumed mainly by Centropomus undecimalis and C. parallelus. In contrast, Polychaeta were preyed upon mainly by Diapterus rhombeus, Eucinostomus argenteus, Sciades herzbergii and S. parkeri. Although most species consumed similar food items, they did that in varying proportions and amounts. Overall, the niche overlap among species was low (< 0.60), but there were several cases where pair of species had their feeding niche highly overlapped (between 0.72 and 0.97). These findings corroborate the hypothesis that food resource partitioning determines species coexistence in estuarine tropical environments.

Feeding ecology of early life stages of striped bass (Morone saxatilis) along an estuarine salinity-turbidity gradient, St. Lawrence Estuary, Canada

2019 ◽  
Vol 41 (4) ◽  
pp. 507-520 ◽  
Author(s):  
L Vanalderweireldt ◽  
P Sirois ◽  
M Mingelbier ◽  
G Winkler
Keyword(s):  
Striped Bass ◽  
Feeding Ecology ◽  
Early Life ◽  
Morone Saxatilis ◽  
Early Summer ◽  
Gut Contents ◽  
Life Stages ◽  
Early Life Stages ◽  
Lawrence Estuary ◽  
Feeding Niche

Abstract After being extirpated from the St. Lawrence River in the 1960s, striped bass (Morone saxatilis) were reintroduced to the estuary in 2002 and by 2008, they were naturally reproducing. To document the habitat use and feeding ecology of this reintroduced population, we examined the gut contents of 333 larvae and juveniles. Samples were collected in four estuarine habitats in 2014: the upstream freshwater section (UP), the oligohaline (O-ETM) and the mesohaline (M-ETM) estuarine turbidity maximum zones, and the downstream polyhaline section (DOWN). In June, pelagic larvae developed in the UP and the O-ETM, feeding mainly on copepods such as Eurytemora affinis. The O-ETM exhibited better suitable feeding conditions compared to the UP, likely due to the presence of Bosmina sp. as a primary prey. After July, striped bass shifted to larger prey items, consuming mainly dipteran pupa in upstream littoral habitats and gammarids and mysids in downstream habitats. In the early summer, the UP provided a high-quality nursery habitat and as the season progressed, the smallest juveniles dispersed downstream and improved their feeding success by exploiting a new feeding niche. This observation suggests that being distributed throughout the estuary may increase the potential survival of striped bass early life stages.

The Use of N-alkanes for Estimating Intake and Passage Rate in Horses

1996 ◽  
Vol 1996 ◽  
pp. 98-98
Author(s):  
B M L McLean ◽  
R W Mayes ◽  
F D DeB Hovell
Keyword(s):  
Recent Work ◽  
Chain Length ◽  
Carbon Chain ◽  
Carbon Chain Length ◽  
Passage Rate ◽  
Forage Crops ◽  
Carbon Chains ◽  
Naturally Occurring ◽  
Chain Lengths ◽  
Long Chain

Alkanes occur naturally in all plants, although forage crops tend to have higher alkane contents than cereals. N-alkanes have odd-numbered carbon chains. They are ideal for use as markers in feed trials, because, they are inert, indigestible and naturally occurring, and can be recovered in animal faeces. Synthetic alkanes (even-numbered carbon chains) are available commercially and can also used as external markers. Dove and Mayes (1991) cite evidence indicating that faecal recovery of alkanes in ruminants increases with increasing carbon-chain length. Thus the alkane “pairs” (e.g. C35 & C36, and C32 & C33) are used in calculating intake and digestibility because they are long chain and adjacent to each other. However, recent work by Cuddeford and Mayes (unpublished) has found that in horses the faecal recovery rates are similar regardless of chain lengths.

The role of the foregut in digestion in the cricket Teleogryllus commodus and the locust Chortoicetes terminifera

2020 ◽  
Vol 68 (4) ◽  
pp. 212 ◽  
Author(s):  
ShangXian Zhou ◽  
James D. Woodman ◽  
Hua Chen ◽  
Paul D. Cooper
Keyword(s):  
Field Cricket ◽  
Passage Rate ◽  
Exterior Surface ◽  
Teleogryllus Commodus ◽  
Black Field ◽  
Food Particles ◽  
Generalist Diet ◽  
Cuticular Structures ◽  
Australian Plague Locust

The role of the foregut (crop and proventriculus) in mechanical processing of food has received little attention in insects. Using the Australian plague locust (Chortoicetes terminifera) and the black field cricket (Teleogryllus commodus) as models, the role of the crop in processing of wheat or rye grass was examined. Interior cuticular structures (spines) of the foregut were described using light and scanning electron microscopy, with locusts having sclerotised structures and crops of crickets being unsclerotised internally. Muscular bands on the exterior surface of the crop part of the foregut are similar in males of both species, but contractions and movements are more forceful in locusts. Passage rate from the foregut is much faster in locusts (&lt;3 h) than in crickets (&gt;3 h). Water within the crop is reduced compared with the water content of fresh grass within the foregut of locusts, but water is increased in cricket crops. Spines within the crops are small relative to the size of food particles in both species. Some spines of locusts contain metals. The slower passage rate from the crop of crickets may be limited by the proventriculus. Foregut structure and food processing facilitates the generalist diet of crickets, but may restrict locusts to consuming softer grasses.

Ethics knowledge of recent paediatric residency graduates: the role of residency ethics curricula

2016 ◽  
Vol 42 (12) ◽  
pp. 809-814 ◽  
Author(s):  
Jennifer C Kesselheim ◽  
Julie Najita ◽  
Debra Morley ◽  
Elizabeth Bair ◽  
Steven Joffe
Keyword(s):  
Decision Making ◽  
Knowledge Score ◽  
Educational Interventions ◽  
Cross Sectional Survey ◽  
Passage Rate ◽  
Cross Sectional ◽  
Formal Curriculum ◽  
Incorrect Decision ◽  
Primary Specialty ◽  
Residency Programme

ObjectiveTo evaluate the relationship between recently trained paediatricians' ethics knowledge and exposure to a formal ethics or professionalism curriculum during residency.MethodsWe conducted a cross-sectional survey of recently trained paediatricians which included a validated 23-item instrument called the Test of Residents' Ethics Knowledge for Pediatrics. The sample included paediatricians who completed medical school in 2006–2008, whose primary specialty was paediatrics or a paediatric subspecialty, and who completed paediatric residency training in 2010–2011. This sample was stratified based on residency programme variables: presence of a formal curriculum in ethics or professionalism, programme size and American Board of Pediatrics certifying exam passage rate. Paediatricians were randomly selected from each stratum for survey participation.ResultsAmong the 370 responding paediatricians (55%), the mean knowledge score was 17.3 (SD 2.2) out of a possible 23. Presence of a formal curriculum in ethics and/or professionalism was not significantly associated with knowledge. Knowledge was lowest on items about parental requests for a child to undergo genetic testing (2 items, 44% and 85% incorrect), preserving patient confidentiality over email (55% incorrect), decision-making regarding life-sustaining technologies (61% incorrect), and decision-making principles such as assent and parental permission (2 items, 47% and 49% incorrect).ConclusionsThis study highlights several areas in which paediatricians' knowledge may be low and that are amenable to targeted educational interventions. These findings should prompt discussion and research among ethicists and educators about how ethics and professionalism curricula can more consistently influence paediatricians' knowledge.

scholarly journals Influence of Frequency of Drinking on Particulate Passage Rate and Dry Matter Disappearance in Grazing Zebu Cattle

1987 ◽  
Vol 40 (5) ◽  
pp. 415 ◽  
Author(s):  
Nashon K. R. Musimba ◽  
M. L. Galyean ◽  
D. L. Whittington ◽  
R. D. Pieper
Keyword(s):  
Dry Matter ◽  
Zebu Cattle ◽  
Passage Rate
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