Feeding Niche Overlap and Food Selection in Smooth and Palmate Newts, Triturus vulgaris and T. helveticus, at a Pond in Mid-Wales

10.2307/4702 ◽  
1986 ◽  
Vol 55 (1) ◽  
pp. 201 ◽  
Author(s):  
R. A. Griffiths
Keyword(s):  
Food Selection ◽  
Niche Overlap ◽  
Feeding Niche ◽  
Triturus Vulgaris

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.

scholarly journals Resource partitioning and ecomorphological variation in two syntopic species of Lebiasinidae (Characiformes) in an Amazonian stream

2016 ◽  
Vol 46 (1) ◽  
pp. 25-36 ◽  
Author(s):  
Nathália Carina dos Santos SILVA ◽  
Aluízio José Lopes da COSTA ◽  
José LOUVISE ◽  
Bruno Eleres SOARES ◽  
Vanessa Cristine e Souza REIS ◽  
...  
Keyword(s):  
Resource Partitioning ◽  
Trophic Ecology ◽  
Species Coexistence ◽  
Stomach Contents ◽  
Relative Length ◽  
Niche Overlap ◽  
The Body ◽  
Feeding Strategies ◽  
Relative Depth ◽  
Feeding Niche

ABSTRACTResource partitioning is important for species coexistence. Species with similar ecomorphology are potential competitors, especially when phylogenetically close, due to niche conservatism. The aim of this study was to investigate the resource partitioning among populations of two species of lebiasinids (Copella nigrofasciata and Pyrrhulina aff. brevis) that co-occur in a first-order Amazonian stream, analyzing the trophic ecology, feeding strategies and ecomorphological attributes related to the use of food and space by these species. Fish were captured in May and September 2010. The stomach contents of 60 individuals were analyzed and quantified volumetrically to characterize the feeding ecology of both species. Eleven morphological attributes were measured in 20 specimens and combined in nine ecomorphological indices. Both species had an omnivorous-invertivorous diet and consumed predominantly allochthonous items. Both showed a tendency to a generalist diet, but intrapopulational variation in resource use was also detected. Overall feeding niche overlap was high, but differed between seasons: low during the rainy season and high in the dry season. In the latter, the food niche overlap was asymmetric because C. nigrofasciata consumed several prey of P. aff. brevis, which reduced its food spectrum. The ecomorphological analysis suggests that C. nigrofasciatahas greater swimming capacity (greater relative length of caudal peduncle) than P. aff. brevis, which has greater maneuverability and tendency to inhabit lentic environments (greater relative depth of the body). Our results demonstrate that these species have similar trophic ecology and suggest a spatial segregation, given by morphological differences related to locomotion and occupation of habitat, favoring their coexistence.

scholarly journals Feeding habits and microhabitat utilization by two syntopic Brazilian Amazonian frogs (Hyla minuta and Pseudopaludicula sp. (gr. falcipes)

1998 ◽  
Vol 58 (4) ◽  
pp. 559-562 ◽  
Author(s):  
M. VAN SLUYS ◽  
C. F. D. ROCHA
Keyword(s):  
Diet Composition ◽  
Niche Breadth ◽  
Feeding Habits ◽  
Niche Overlap ◽  
Microhabitat Use ◽  
Feeding Niche ◽  
Frog Species

We studied the feeding habits and microhabitat use of the Amazonian frogs Hyla minuta and Pseudopaludicula sp. at Serra Norte, Carajás, Brazil. Although living syntopically, the two species differed markedly in both prey types and sizes. Standardized feeding niche breadth of H. minuta (Bst = 0.572) was larger than that of Pseudopaludicula sp. (Bst = 0.149) and their feeding niche overlap was considerably low (10.5%). The two frog species also differed in microhabitat use. When active, Pseudopaludicula sp. were found partially submerged at the lake border whereas H. minuta were found predominantly on Nymphaea sp. leaves. Although we have not evaluated taxonomic effects on diet composition, differences in diet may be partially explained by differences in microhabitat use and frogs' size.

Feeding ecology of breeding Long-eared Owls in southwestern Idaho

1984 ◽  
Vol 62 (8) ◽  
pp. 1528-1533 ◽  
Author(s):  
Jeffrey S. Marks
Keyword(s):  
Small Mammals ◽  
Feeding Ecology ◽  
Food Selection ◽  
Prey Type ◽  
Birds Of Prey ◽  
Snake River ◽  
Feeding Niche ◽  
Prey Composition ◽  
Breeding Seasons ◽  
Mammal Faunas

Feeding ecology of Long-eared Owls (Asio otus) was investigated in the Snake River Birds of Prey Area, southwestern Idaho, during the breeding seasons of 1980 and 1981. The owls preyed mainly on five genera of small mammals: Peromyscus, Perognathus, Dipodomys, Microtus, and Reithrodontomys. There was considerable variation in prey composition among sites but not between years. In both years the proportion of Perognathus in the diet increased after the young owls fledged. Compared with other North American studies, Long-eared Owls in the Snake River Birds of Prey Area had a wider feeding niche and preyed more extensively on nonmicrotines. The range of prey sizes in Long-eared Owl diets was similar to that in other areas, with most prey weighing less than 100 g. Interlocality differences in the Long-eared Owl feeding niche probably reflect differences in the composition of small mammal faunas. Long-eared Owls in the Snake River Birds of Prey Area appeared to feed opportunistically on a diversity of available small mammals; prey size, rather than prey type, was the most important factor in food selection.

scholarly journals Comparative feeding ecology of four syntopic Hypostomus species in a Brazilian southeastern river

2016 ◽  
Vol 76 (3) ◽  
pp. 692-699 ◽  
Author(s):  
G. A. Villares-Junior ◽  
I. B. Cardone ◽  
R. Goitein
Keyword(s):  
Niche Overlap ◽  
Southeastern Brazil ◽  
Ecological Interactions ◽  
Insect Larvae ◽  
Anatomical Features ◽  
Food Items ◽  
Feeding Niche ◽  
Morphological Aspects ◽  
Trophic Morphology ◽  
Local Abundance

Abstract Though their broad distribution in most Brazilian rivers, scarce studies concerning ecological interactions on Hypostomus species are available. This study observes the diet, the trophic interactions and some morphological aspects of four syntopic species of Hypostomus. These fishes were studied at the superior part of the Corumbataí river, at São Paulo state, southeastern Brazil. Analyses focused feeding patterns, their amplitude and whether there happens some food items overlap among the species. Fish were caught using cast nets at some points of the river. Species were chosen according to their local abundance and, so there were four main species: H. albopunctatus, H. ancistroides, H. regani and H. strigaticeps. Nine food items were found: sediments, fungi, diatoms, green algae, Tecamoeba, vegetal debris and invertebrates. There were not significant differences for the feeding pattern among the four Hypostomus species. The feeding niche amplitude has been larger for H. albopunctatus influenced by a larger amount of vegetal debris and invertebrates. Elevated niche overlap was found to happen among the species and also for their trophic morphology. Results may suggest that there is a similar pattern in food taken between four species of Hypostomus analyzed since all consume similar environmental resources and have similar anatomical features. However, a different intake insect larvae and plant material in H. albopunctatus diet indicate differences in local and how this species may be exploring their food compared to the others.

Degree of feeding niche overlap uniformises the distribution of interspecific territories in a Malawian cichlid community

2018 ◽  
Vol 28 (2) ◽  
pp. 247-256
Author(s):  
Masaki Kawakami ◽  
Richard Zatha ◽  
Bosco Rusuwa ◽  
Atsushi Maruyama
Keyword(s):  
Niche Overlap ◽  
Feeding Niche

Demonstrating Nutrient Cost Gradients: A Brooklyn Case Study

2014 ◽  
Vol 84 (5-6) ◽  
pp. 244-251 ◽  
Author(s):  
Robert J. Karp ◽  
Gary Wong ◽  
Marguerite Orsi
Keyword(s):  
Low Income ◽  
Energy Content ◽  
Food Selection ◽  
The United States ◽  
United States Department ◽  
Micronutrient Deficiencies ◽  
Caloric Density ◽  
Low Income Families ◽  
The Cost ◽  
The Impact

Abstract. Introduction: Foods dense in micronutrients are generally more expensive than those with higher energy content. These cost-differentials may put low-income families at risk of diminished micronutrient intake. Objectives: We sought to determine differences in the cost for iron, folate, and choline in foods available for purchase in a low-income community when assessed for energy content and serving size. Methods: Sixty-nine foods listed in the menu plans provided by the United States Department of Agriculture (USDA) for low-income families were considered, in 10 domains. The cost and micronutrient content for-energy and per-serving of these foods were determined for the three micronutrients. Exact Kruskal-Wallis tests were used for comparisons of energy costs; Spearman rho tests for comparisons of micronutrient content. Ninety families were interviewed in a pediatric clinic to assess the impact of food cost on food selection. Results: Significant differences between domains were shown for energy density with both cost-for-energy (p < 0.001) and cost-per-serving (p < 0.05) comparisons. All three micronutrient contents were significantly correlated with cost-for-energy (p < 0.01). Both iron and choline contents were significantly correlated with cost-per-serving (p < 0.05). Of the 90 families, 38 (42 %) worried about food costs; 40 (44 %) had chosen foods of high caloric density in response to that fear, and 29 of 40 families experiencing both worry and making such food selection. Conclusion: Adjustments to USDA meal plans using cost-for-energy analysis showed differentials for both energy and micronutrients. These differentials were reduced using cost-per-serving analysis, but were not eliminated. A substantial proportion of low-income families are vulnerable to micronutrient deficiencies.

Modifikasi Resep Brownis Untuk Makanan Selingan Penderita Diabetes Mellitus

2017 ◽  
Vol 19 (2) ◽  
pp. 140
Author(s):  
Setyowati Setyowati
Keyword(s):  
Diabetes Mellitus ◽  
Nutritional Value ◽  
Food Selection ◽  
Diabetes Mellitus Patient ◽  
Fiber Content ◽  
Green Bean ◽  
Snack Food ◽  
Physical Quality ◽  
Organoleptic Quality ◽  
Red Bean

Background: The nutritional therapy management of diabetes mellitus patient lies in the proper diet and food selection arrangement. There is an eating recomendation (3 times for main food and 3 times of snackfood) that needed to be noted. One of the snack food that been allowed is brownie, as baked product and cake category. Modification on brownie recipe are needed to improve quality of the food. Objective: To understand a brownie recipe as snack food for diabetes mellitus patient based on physical quality, organoleptic quality, nutritional value and fiber content. Methods: The type of this research is an artificial experiment. The variables were modified brownie recipes; physical quality; organoleptic quality to colour, flavor, aroma, and texture; nutritional value, and fiber content. The subject of the study are 36 people with diabetes and 17 expert panelists. The object of this research is 3 kinds of brownie (red bean brownie, green bean brownie and peanut brownie). This research is conducted at Poltekkes Kemenkes Yogyakarta and Prolanis Organization in Puskemas Gamping 1 area, Sleman, Yogyakarta on February-September 2016. The data analysis of this research is done descriptively and analytically. Results: There is 3 brownie as modification results (green bean brownie, red bean brownie and peanut brownie). Those brownie have physical traits such as darker brown in colour, little bit sweet, have nutty flour aroma and little bit soft as a texture. Based on organoleptic quality, peanut brownie is the most preferred brownie. Based on analysis of chemical nutrition and fiber. Brownies tahat qualify the diet of people with diabetes mellitus is peanut brownie. Peanut brownie also been accepted by diabetes mellitus patient. Conclusion: Peanut brownie as modification results choosen as snack food alternatives for diabetes mellitus patient.

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