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Performance of artificial neural networks and traditional methods in determining selected growth parameters of Alburnus sellal Heckel, 1843

Ozcan Ebru Ifakat

Oceanological and Hydrobiological Studies

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2024

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Vol. 53, No. 2

153--163

EN

In this study, predictions were made on the growth performance of Alburnus sellal Heckel, 1843 from the Munzur River using back propagation artificial neural networks and ANN algorithms. Statistical growth models used in fish biology and results obtained from artificial neural networks were compared. A total of 239 samples were used in this comparison. It was determined that the population is distributed across age groups 0–VII. The relationship between length and weight was calculated as W = 0.0046L3.198 for all individuals. The von Bertalanffy growth parameters were calculated for all individuals: Lt = 21.93 [1 – e–0.158 (t + 2.11)]; Wt = 102.29 [1 – e–0.158 (t + 2.11)]3.198. The growth performance index (Ф’) value was 1.880 for all individuals. The condition factor varied between 0.479 and 1.115 for females and between 0.533 and 1.076 for males. The Mean Absolute Percent Error (MAPE) statistic was used, which is a widely used method to measure the accuracy of the predictions made. It was determined that ANNs MAPE (%) values were better than MAPE values calculated for the length–weight relationship and von Bertalanffy growth function models for A. sellal. This study shows that ANNs can be used as an alternative useful method for predicting population parameters. ANN models are therefore an effective tool to describe fish growth parameters. They have been found to be a useful predictive tool. The developed models can be used to predict future sustainable fish management.

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Effect of L-glycine on the Growth and Selected Nutritional Elements of Butterhead Lettuce

Rosa Robert, Franczuk Jolanta, Zaniewicz-Bajkowska Anna, Remiszewski Karol, Dydiv Ihor

Journal of Ecological Engineering

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2022

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Vol. 23, nr 7

20--28

EN

In agricultural practice, there is a need to change the forms of fertilizers to be friendlier to the natural environment and human health. To this end, research has been carried out on the partial replacement of fertilisers containing nitrates or ammonium compounds with amino acid nitrogen. The present studies assessed the effect of L-glycine on growth parameters and on the content of selected nutrients in the butterhead lettuce grown in an unheated greenhouse in the spring. The treatment consisted of foliar L-glycine application at the following concentrations: 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220 and 240 mg∙L-1, with a solution dose of 50 ml∙m-2. Foliar application of L-glycine improved the butterhead lettuce growth parameters. The most favourable values of the head weight, root system weight and the number and length of leaves were recorded for the plants fed with doses ranging from 80 to 120 mg∙L-1. The weight of the head and the root system was most favourable after foliar feeding with 120 mg∙L-1 of L-glycine. Additionally, a high value of the SPAD leaf greenness index was noted as a response to the same dose, indicating a high level of leaf nitrogen nutrition. However, foliar feeding with L-glycine had no statistically significant effect on the nutritional value of lettuce, i.e. the content of dry matter, protein, sugars and ascorbic acid.

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Wpływ technologii produkcji sadzonek sosny zwyczajnej (Pinus sylvestris l.) na wzrost w początkowej fazie rekultywacji gruntów poeksploatacyjnych kopalni wapienia

Szewczyk M., Kacprzak M.

Logistyka

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2013

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nr 4

PL

W artykule przedstawiono wpływ metody produkcji sadzonek z zakrytym systemem korzeniowym: mikoryzowanych i niemikoryzowanych i z odkrytym systemem korzeniowym na wzrost jednorocznych sadzonek sosny zwyczajnej w uprawie z wysokim stopniem degradacji gleby. Doświadczenie założono na płaskim spągu wyrobiska Kopalni Wapienia Górażdże. Wiosną po upływie roku od nasadzeń do pomiarów biometrycznych przyjęto 37 sadzonek z trzech poletek. Sadzonki sosny zmierzono pod względem dwóch parametrów: wysokości [cm] oraz rocznego przyrostu wysokości [cm]. Wyniki wykazały, że sadzonki ze szkółki kontenerowej niepoddane kontrolowanej mikoryzacji są wyższe średnio o 4,05 [cm] w porównaniu do sadzonek mikoryzowanych grzybem Hebeloma crustuliniforme. Niemikoryzowane sadzonki miały również większy średni roczny przyrost o 0,59 [cm] w porównaniu do mikoryzowych siewek. Jednoroczne sosny zwyczajne ze szkółki gruntowej z odkrytym system korzeniowym charakteryzują się najniższą średnią wysokością na poziomie 17,65 [cm]. Uzyskane wstępne wyniki badań wskazują na zasadność stosowania technologii produkcji sadzonek ze szkółki kontenerowej do rekultywacji terenów po odkrywkowej eksploatacji wapieni.

EN

The article shows the impact of the production method container-grown seedling: mycorrhized and non-micorrhized and field - grown bare – root on the growth one-year old Scots pine seedling in the cultivation with high degree of soil degradation. The experiment was established on the reclaimed pit of Górażdże Limestone Mine. Seedlings of Scots pine (Pinus sylvestris L.) were planted in April 2011. For biometric measurements adopted on 37 seedlings from the three plots in April 2012. Seedlings of pine were measured in terms of two parameters: height (cm) and annual height increment [cm]. The results showed that the container-grown seedlings not subjected to controlled mycorrhization are higher average of 4,05 [cm] in compare to the seedlings mycorrhized with fungus Hebeloma crustuliniforme. The non-mycorrhizal seedlings also had heigher annual height increment average of 0,59 cm in compare to mycorrhizal seedlings. One-year Scots pine from the field nursery with bare - root system characterized the lowest average height of 17.65 cm, respectively. The obtained preliminary results indicate the validity of the use of technology container-grown seedling for the reclamation of abandoned limestone mining areas.

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Growth of Vaccinium myrtilis L. (Ericaceae) in spruce forests damaged by air pollution

Kukla J., Kuklova M.

Polish Journal of Ecology

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2008

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Vol. 56, nr 1

149-155

EN

The growth parameters of the Vaccinium myrtillus shoots were studied on a vertical transect crossing localities "Muran" (1080-1110 m a.s.l., skeli-humic podzols, Fageta abietino-piceosa) and "Hliniky" (950-960 m a.s.l, dystric cambisols, Abieti-Fageta inferiora) in the protected zone of the National park "Slovensky raj" (Spis region, East Slovakia). In the localities, both contaminated by air pollution research plots in undamaged and damaged (with lower stand density and canopy compactness) spruce ecosystems were established. The content of Al and Cr was significantly higher in cambisols, and that of Cd - in podzols. The limit values calculated for both soils have been exceeded only in case of mercury. The Al content in bilberry twigs exceeded the background values (by 44-76%) in case of the both plots situated on locality "Muran", and that of Ni and Pb concentrations (by 3-60%) only on damaged plot. The mean content of Ni and Pb was significantly higher in bilberry twigs growing on podzols and the mean content of Al was significantly higher in plants on undamaged plots. The mean length, weight as well as energy content of bilberry twigs were significantly higher in damaged spruce plots (on average by 33%), probably due to favourable light conditions.