Diets of commercially exploited fish from Bass Strait and adjacent Victorian Waters, south-eastern Australia

1984 ◽  
Vol 35 (5) ◽  
pp. 549 ◽  
Author(s):  
N Coleman ◽  
M Mobley
Keyword(s):  
Stomach Contents ◽  
Relative Importance ◽  
Food Items ◽  
South Eastern ◽  
Major Food ◽  
Eastern Australia ◽  
Commercial Species ◽  
Index Of Relative Importance ◽  
South Eastern Australia

Stomach contents were analysed to investigate the diets of 52 commercial species of fish. Fish were collected from Bass Strait and adjacent Victorian waters, south-eastern Australia; samples effectively covered the whole of the Victorian coast. Particular emphasis was placed on estimating the importance of arrow squid, Nototodarus gouldri in the diets of the species investigated. For most of the species investigated, the major food items (expressed as the proportion of stomach contents by number, weight and volume or through the calculation of the Index of Relative Importance) were fish or crustaceans. Cephalopods were found in the diets of 21 species but provided a major proportion of the stomach contents in only six species. Arrow squid did not appear to be a major item in the diets of any of the species investigated. For those species that eat large amounts of cephalopods, it appears to be octopus, rather than squid, that is of most significance in the diet.

scholarly journals Diet of the freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) on Marajó Island (Pará, Brazil)

2010 ◽  
Vol 70 (1) ◽  
pp. 155-162 ◽  
Author(s):  
MP. Almeida ◽  
PMO. Lins ◽  
P. Charvet-Almeida ◽  
RB. Barthem
Keyword(s):  
Stomach Contents ◽  
Relative Importance ◽  
Food Items ◽  
Freshwater Stingray ◽  
Marajó Island ◽  
Index Of Relative Importance

The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated. The level of repletion 1 (¼ full) was the most representative for both sexes, as well as for immature and mature specimens. Most of the food items found were well-digested. The food items identification indicated the presence of 15 orders, including insects, mollusks, crustaceans, annelids and fish. Differences in diet were observed among the locations studied when comparing %IRI, crustaceans being the most preferred in Afuá, fish in Lake Arari and mollusks in Muaná.

scholarly journals Trophic niches of a seabird assemblage in Bass Strait, south-eastern Australia

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8700 ◽  
Author(s):  
Aymeric Fromant ◽  
Nicole Schumann ◽  
Peter Dann ◽  
Yves Cherel ◽  
John P.Y. Arnould
Keyword(s):  
Climate Change ◽  
Feeding Behaviour ◽  
Stomach Contents ◽  
Breeding Phenology ◽  
South Eastern ◽  
Interspecific Differences ◽  
Eastern Australia ◽  
Prey Remains ◽  
Trophic Niches ◽  
South Eastern Australia

The foraging niches of seabirds are driven by a variety of factors, including competition for prey that promotes divergence in trophic niches. Bass Strait, south-eastern Australia, is a key region for seabirds, with little penguins Eudyptula minor, short-tailed shearwaters Ardenna tenuirostris, fairy prions Pachyptila turtur and common diving-petrels Pelecanoides urinatrix being particularly abundant in the region. The trophic niches of these species were investigated using isotopic values in whole blood and by identifying prey remains in stomach contents. The four species occupied different isotopic niches that varied among years, seasons and regions. Little penguins consumed mainly fish whereas the three procellariforms primarily consumed coastal krill Nyctiphanes australis. The dietary similarities between the procellariforms suggest that food resources are segregated in other ways, with interspecific differences in isotope niches possibly reflecting differential consumption of key prey, divergent foraging locations and depth, and differences in breeding phenology. Because oceanographic changes predicted to occur due to climate change may result in reduced coastal krill availability, adversely affecting these seabird predators, further information on foraging zones and feeding behaviour of small procellariform species is needed to elucidate more fully the segregation of foraging niches, the capacity of seabirds to adapt to climate change and the potential for interspecific competition in the region.

The Feeding Ecology of the Dingo. 1. Stomach Contents From Trapping in South-Eastern Australia, and the Non-Target Wildlife Also Caught in Dingo Traps.

1983 ◽  
Vol 10 (3) ◽  
pp. 477 ◽  
Author(s):  
AE Newsome ◽  
LK Corbett ◽  
PC Catling ◽  
RJ Burt
Keyword(s):  
Feeding Ecology ◽  
Canis Familiaris ◽  
Stomach Contents ◽  
South Eastern ◽  
Eastern Australia ◽  
Feral Pig ◽  
South Eastern Australia

In stomach contents of 530 dingoes (Canis familiaris dingo) in south east Australia, 89.3% of feed, by occurrence, was large and medium-sized marsupials (Wallabia, Macropus, Pseudocheirus and Trichosurus). Of 26 dingoes with sheep or cattle remains in the stomach, 11 had eaten it as carrion, judging from the presence of maggots, and 5 of those had obtained it from carcasses used as bait for the traps. There was 4% of feral pig, 0.3% of horse and 7.8% of rabbit, which are all regarded as pests. There were 26 species of prey altogether. Of the 25 other species caught in the traps, over 20 were protected wildlife.

Ecological Feeding Analysis of South-Eastern Australian Scincids (Reptilia, Lacertilia)

1991 ◽  
Vol 39 (1) ◽  
pp. 9 ◽  
Author(s):  
GW Brown
Keyword(s):  
Body Size ◽  
Vertical Distribution ◽  
Food Selection ◽  
Gut Contents ◽  
Individual Species ◽  
Food Items ◽  
South Eastern ◽  
Eastern Australia ◽  
Group Species ◽  
South Eastern Australia

The gut contents of 936 skinks, representing 15 species resident in south-eastern Australia, were examined. Multicategorisation of food items reveals that a wide variety of plant and invertebrate material is ingested, the proportions and types of which appear to be dependent upon several criteria. All species investigated are opportunistic and widely foraging generalists, although important determinants of food selection appear to be the size of the lizard and its vertical distribution. When the diets of individual species are amalgamated according to suprageneric groups, certain dietary traits emerge. Egernia-group species, which are relatively large, are generally herbivorous, with the degree of herbivory correlated directly to body size. Smaller species of the Leiolopisma (Eugongylus) and Sphenomorphus groups mainly eat insects.

Diet of Hydromedusa tectifera (Testudines-Chelidae) in a mountain stream of Córdoba province, Argentina

2009 ◽  
Vol 30 (4) ◽  
pp. 545-554 ◽  
Author(s):  
Julián Lescano ◽  
Marcelo Bonino ◽  
Gerardo Leynaud ◽  
José Haro
Keyword(s):  
Diversity Index ◽  
Stomach Contents ◽  
Detrended Correspondence Analysis ◽  
Mountain Streams ◽  
Mountain Stream ◽  
Relative Importance ◽  
Size Classes ◽  
Food Items ◽  
Index Of Relative Importance ◽  
Morisita Index

AbstractThe diet of Hydromedusa tectifera occurring in two mountain streams in the province of Córdoba is described through a comparative analysis of 154 individuals. Turtles were manually captured between August 2005 and August 2006 from streams at the localities of Tanti and Flor Serrana. Before being released, turtles were stomach-flushed, and sex and carapace length were recorded. The stomach contents were observed under stereomicroscope; prey items were identified and classified according to size and volume. The importance of the different items was quantified using the Index of Relative Importance (IRI). Similarity in the diet between sexes and among size classes and seasons of an annual cycle was evaluated using the simplified Morisita index. Trophic breadth was estimated with the Shannon diversity index. Detrended Correspondence Analysis (DCA) was used to evaluate differences in the diet between categories (sex, size classes). Forty-seven food items belonging to the following taxa were identified: leeches, annelids, gastropods, arachnids, insects, and fishes. According to the IRI value, the most important items in the diet of H. tectifera were larvae of Trichoptera (IRI = 33.5), fishes (IRI = 30), and naiads of Odonata (IRI = 25.2). The relative importance of the items varied with size of turtles but not with sex. Size of prey consumed increased with increasing turtle size. A greater trophic breadth was observed in smaller individuals.

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