scholarly journals Feeding of Barbus cyclolepis Heckel, 1837 (Teleostei: Cyprinidae) and its relationship with benthic macroinvertebrate fauna in the Istranca Stream (İstanbul, Turkey)

2021 ◽  
Vol 38 (3) ◽  
pp. 345-353
Author(s):  
Gülşah Saç ◽  
Nilay Dökümcü ◽  
Oya Özuluğ ◽  
Müfit Özuluğ
Keyword(s):  
High Selectivity ◽  
Expected Value ◽  
Benthic Macroinvertebrate ◽  
Food Spectrum ◽  
Food Groups ◽  
Electivity Index ◽  
Diet Analyses ◽  
Index Value ◽  
Feeding Environments ◽  
Macroinvertebrate Fauna

The aims of the study are to determine what the organisms Barbus cyclolepis consume as food in its feeding environments and to compare prey consumption with prey abundance in the environment. The study was conducted in the Istranca Stream located in Istanbul (Turkey) during the spring and summer of 2012. A total of 142 B. cyclolepis specimens were captured and it is determined that 94 of them had full digestive tracts. Diet analyses of B. cyclolepis showed that its food spectrum consisted of 11 different food types, and the species was found to feed on insects, mainly Diptera (IRI%= 92.26%). The most abundant macroinvertebrate organisms in the environment were Diptera and Gastropoda. The electivity index of B. cyclolepis was positive for Diptera in the spring (E= 0.49), but the value was below the expected value of 0.6 for high selectivity. The electivity values for other macroinvertebrate groups, consumed in low proportions, were negative. In summer, the fish fed on Diptera, Plecoptera, and Trichoptera, but a high electivity index value was found only for Trichoptera (E= 0.87). Results showed that B. cyclolepis mainly consumed Diptera as food and did not consume Gastropoda, although it is the second most abundant macroinvertebrate group in the environment. A relationship was determined between the proportion of food groups consumed in the digestive tracts of fish and the ratios of macroinvertebrates in the environment, and as a result, it was specified that the fish was selective on Diptera.

A Priori Typology-Based Prediction of Benthic Macroinvertebrate Fauna for Ecological Classification of Rivers

2008 ◽  
Vol 42 (5) ◽  
pp. 894-906 ◽  
Author(s):  
Jukka Aroviita ◽  
Esa Koskenniemi ◽  
Juho Kotanen ◽  
Heikki Hämäläinen
Keyword(s):  
A Priori ◽  
Benthic Macroinvertebrate ◽  
Ecological Classification ◽  
Macroinvertebrate Fauna

scholarly journals The Spatial Heterogeneity of the Black Scorpionfish, Scorpaena porcus (Scorpaenidae): Differences in Length, Dietary and Age Compositions

2021 ◽  
Vol 11 (24) ◽  
pp. 11919
Author(s):  
Josipa Ferri ◽  
Sanja Matić-Skoko
Keyword(s):  
High Selectivity ◽  
Adriatic Sea ◽  
Multivariate Analyses ◽  
Growth Parameters ◽  
Island Area ◽  
Intraspecific Variations ◽  
Geographical Scale ◽  
Diet Analyses ◽  
Slow Growing ◽  
Scorpaena Porcus

The present study assessed spatial variations in several biological characteristics of Scorpaena porcus Linnaeus, 1758 and estimated length structure, dietary composition and growth parameters for the species. Sampling was carried out in two areas, about 200 km apart, in the coastal Adriatic Sea, which is the northernmost region of the Mediterranean. A total of 388 specimens of S. porcus were caught, 233 from the Split area and 155 from the Pag Island area, and a higher proportion of individuals in the ≤15 cm length classes were found in the Split area. The results of the age, growth and diet analyses demonstrated that the black scorpionfish is a slow-growing and long-lived species that feeds on a wide variety of plant and animal taxa and shows a high selectivity for crustacean decapods. Detailed comparisons and multivariate analyses showed significant fine-scale spatial structuring of the investigated species, as observed length, dietary and age compositions were heterogeneous among the two areas. Fish from the Pag Island area ingested a greater diversity of the prey types, fed to a greater extent on fishes, reached the highest total length and showed a higher growth rate. Such intraspecific variations could reflect adaptations to different environmental conditions and support the geographical scale at which local black scorpionfish populations should be managed.

scholarly journals Food Security Assessment in Azad Jammu and Kashmir: Empirical Analysis of Dietary Diversity, Current and Project Food Demand and Supply-Demand Gap

2020 ◽  
Vol 4 (3) ◽  
pp. 185-198
Author(s):  
Ghulam Sadiq Afridi ◽  
Muhammad Ishaq ◽  
Abdul Jabbar
Keyword(s):  
Income Elasticity ◽  
Dietary Diversity ◽  
Seemingly Unrelated Regression ◽  
Food Demand ◽  
Security Assessment ◽  
Food Groups ◽  
Jammu And Kashmir ◽  
Price Elasticities ◽  
Multi Stage ◽  
Index Value

This study attempts to determine the dietary diversity score for different food groups and estimates the current demand for different food groups in AJK. Data for this study was collected from 1250 households covering all 10 administrative districts of AJK by following multi-stage sampling techniques through a comprehensive interview schedule. Ten commodity groups (Wheat, Rice, Milk, Meat, Vegetables, Fruits, Pulses, Oil/Ghee, Tea and Other food were developed for analysis. Linear Approximate-Almost Ideal Demand System (LA-AIDS) model was used for estimating food demand elasticities through Zellner’s Seemingly Unrelated Regression by using STATA software. All the 10 food groups were found normal goods, except milk and fruits (income elasticity higher than unity). This implies that in future demand for milk and fruits would increase more proportionately as income would increase. The own price elasticities of all 10-food groups were also found congruent to economic theory (Wheat-0.28, Rice-0.65, Milk-0.92, Meat-0.34, Fruits-0.61, Vegetables-0.21, Pulses-0.29, Oil and ghee-0.04, Tea-0.35 and Other food-0.32). The income and own price elasticities depicted that wheat, vegetables, pulses and oil and ghee are necessities as compared to other food groups. The cross-price elasticity illustrated that rice could be a substitute for wheat and wheat for rice in the State of AJK. The Berry’s Index (82.43) depicted that food was diverse on average with a minimum Index value of 61.31. The study of different factors in relation to Berry’s Index depicted that education and income significantly and positively affect Berry’s Index while location of household in urban or rural area do not affect diversification of food. Inclusion of all necessities in Food Stamp program and Ramadan package and efforts by agriculture and livestock department regarding improved production of food commodities are recommended.

Benthic Macroinvertebrate Fauna of the Mt. Gwanggyo in Gyeonggi-do, Korea

2009 ◽  
Vol 7 (1_2) ◽  
pp. 75-89
Author(s):  
Hyun Soo KIM ◽  
Tae Joong YOON ◽  
Yeon Jae BAE
Keyword(s):  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Fauna
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