Trophic resource partitioning by sympatric ecomorphs of Schizopygopsis (Cyprinidae) in a young Pamir Mountain lake: preliminary results

2020 ◽  
Author(s):  
Aleksandra S. Komarova ◽  
Oksana L. Rozanova ◽  
Boris A. Levin
Keyword(s):  
Resource Partitioning ◽  
Mountain Lake ◽  
Preliminary Results ◽  
Trophic Resource

scholarly journals Vector of Trophic Resource Partitioning in the Variability of Individuals of the Generalized form of the Large African Barbs of the Barbus (= Labeobarbus) Intermedius Complex, Ethiopia, Tana, Langano and Awasa Lakes

2021 ◽  
Vol 61 (4) ◽  
pp. 616-624
Author(s):  
A. N. Mironovsky
Keyword(s):  
Data Analysis ◽  
Resource Partitioning ◽  
Specific Weight ◽  
Original Method ◽  
Water Bodies ◽  
Great Similarity ◽  
Evolutionary Potential ◽  
Lake Tana ◽  
Trophic Resource

Abstract Analysis of the diversification of barbs of the generalized form of the Barbus (= Labeobarbus) intermedius complex in the monomorphic populations of Langano and Awasa lakes and in the polymorphic population of Lake Tana makes it possible to reveal parameters of the variability that is directed to trophic resource partitioning. The great similarity of the parameters revealed in the three studied water bodies shows that in monomorphic populations the structure of variability directed to trophic resource partitioning is identical to that in the polymorphic population. The concept of “vector of trophic resource partitioning” is introduced. In the polymorphic population, this vector makes the main contribution to the diversification of individuals, while its importance is secondary in monomorphic populations. It is concluded that the different evolutionary potential of polymorphic and monomorphic populations is determined by the specific weight of diversification caused by the vector of trophic resource partitioning. The original method of data analysis used in the study may be promising for studying similar situations in other systematic groups.

Food habits and trophic resource partitioning among three mormyrid fishes from man-made Lake Ayame, Ivory Coast

2006 ◽  
Vol 41 (2) ◽  
pp. 266-274
Author(s):  
E. P. Kouamélan ◽  
T. Koné ◽  
V. N’Douba ◽  
F. Ollevier
Keyword(s):  
Resource Partitioning ◽  
Ivory Coast ◽  
Food Habits ◽  
Trophic Resource ◽  
Mormyrid Fishes

scholarly journals Unexpected Diversity of Feeding Modes among Chisel-Mouthed Ethiopian Labeobarbus (Cyprinidae)

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2345
Author(s):  
Boris A. Levin ◽  
Aleksandra S. Komarova ◽  
Oksana L. Rozanova ◽  
Alexander S. Golubtsov
Keyword(s):  
Adaptive Radiation ◽  
Resource Partitioning ◽  
Piscivorous Fish ◽  
Evolutionary Diversification ◽  
Feeding Modes ◽  
Significant Difference ◽  
Trophic Resource ◽  
C And N ◽  
Using Data ◽  
Protein Rich

Trophic resource partitioning is one of the main drivers of adaptive radiation. The evolutionary diversification of large African barbs, the genus Labeobarbus, seems to be related to mouth polymorphism. The chisel-mouthed or scraping phenotype has repeatedly evolved within Labeobarbus. At least five ecomorphs with a scraping mouth morphology were detected in the waters of the Ethiopian Highlands and can be provisionally classified into two groups: (i) “Varicorhinus”-like, and (ii) “Smiling”-like. Previously, all Labeobarbus with a scraping-mouth morphology were considered to be periphyton feeders. Using data on morphology, diet and stable isotope ratios (C and N), we addressed the question: does a scraping-mouth morphology predict feeding on periphyton? Our study revealed that five scraper ecomorphs exhibited three main feeding modes: (i) periphyton-eating, (ii) herbivory–detritivory, and (iii) insectivory. Two cases of the parallel divergence of sympatric ecomorphs with distinct feeding modes (herbivory–detritivory vs. insectivory) were revealed in two geographically isolated basins. A significant difference in δ15N values was detected among sympatric scraper ecomorphs. A periphytonophagous scraper was rich in δ15N values that are comparable with those in sympatric piscivorous fish. This data sheds light on the possibility of the utilization of periphyton as a protein-rich food by fishes.

Distribution and ecology of Myxomycetes in temperate forests. I. Patterns of occurrence in the upland forests of southwestern Virginia

1988 ◽  
Vol 66 (11) ◽  
pp. 2187-2207 ◽  
Author(s):  
Steven L. Stephenson
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Resource Partitioning ◽  
Seasonal Pattern ◽  
Niche Overlap ◽  
Mountain Lake ◽  
Lake Area ◽  
Forest Communities ◽  
Important Species ◽  
Distribution And Ecology

A comparative ecological study of the Myxomycetes occurring in five different upland forest communities in the Mountain Lake area of southwestern Virginia was carried out during 1982–1986. Although the forest communities selected for study occupied different relative positions (from subxeric to mesic) with respect to an environmental moisture complex-gradient, a high degree of similarity existed among the communities for species composition of Myxomycetes. However, absolute abundance, species richness, and species diversity were higher for the more mesic communities. The seasonal pattern was for both species richness and species diversity to be exceedingly low early in the season, to increase to their highest levels in August, and then to decline throughout the remainder of the season. In general, Myxomycetes appear to be rather opportunistic organisms, occupying those microhabitats suitable for their growth and development as these become available to them. Nevertheless, considerable resource partitioning among species would seem to exist, since characteristic patterns of microhabitat occupation and sporulation phenology were noted for most species. In an effort to quantify resource partitioning, values of niche breadth and niche overlap were calculated for 39 quantitatively important species.

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