2024-03-28T11:54:35Z
https://cat.journals.ekb.eg/?_action=export&rf=summon&issue=3758
Catrina: The International Journal of Environmental Sciences
1687-5052
1687-5052
2015
10
1
Effect of temperature on egg development and life table of Chrotogonus homalodemus (Blanchard, 1836) (Orthoptera: Pyrgomorphidae)
Nawal
Zohdy
Khalid
Abdel Rahman
Nermeen
Amer
Construction of a life table is a simple method for keeping track of births, deaths and reproduction for insect life tables, parameters are basically calculated by recording death and births within a population on a daily basis from the time that the first egg of an insect is born to the time that all of the insects regardless of their development die. Chrotogonus homalodemus is a grasshopper pest of seedlings in north and east Africa and in south Asia. This study indicated that the effect of constant temperature on the egg hatchability of C. homalodemus resulted in threshold temperature 150C. Life table of C. homalodemus was conducted and analyzed in outdoor conditions. The data also revealed that adult males metamorphosed from the sixth instar while some of adult females metamorphosed from seventh instar. Second and fourth developmental instars of C. homalodemus of the 1st generation and first, second and fourth instars of the 2nd generation may be the best target for the application of control measures.
Egg development
life table
Pyrgomorphidae
Temperature
2015
01
01
1
9
https://cat.journals.ekb.eg/article_18009_b4230ed78e556867088c8eea0ffabbb8.pdf
Catrina: The International Journal of Environmental Sciences
1687-5052
1687-5052
2015
10
1
Seed Ecology and Environmental Conditions of Hypericum sinaicum, Growing in South Sinai, Egypt
Abdelrauf
Moustafa
Mohamed
Zaghloul
Dina
Al-Sharkawy
There are increasing threats facing the rare plants including the endemic populations. Also the potential development of the earth's vast desert areas for agriculture and other human-needs demands an awareness of the ecological characteristics and requirements of desert vegetation. Saint Catherine area has a unique location and environment. The vegetation and wild life in Saint Catherine area is subjected to great disturbance through the unmanaged human activities. In the present study we had used seed ecology in order to contribute in designing a sound long term conservation plan for the threatened endemic studied medicinal species; Hypericum sinaicum, at two levels; (a) soil seed bank and its relationship to above ground vegetation and (b) the germination response at different conditions and pretreatments on wetted substrate. Hypericum sinaicum grows in Sinai on mountainous sheltered moist crevices and in Hijaz in the extreme north-west of Saudi Arabia and in Edom in Jordan. The results revealed that seven endemic species were identified in soil seed bank; Veronica khaiseri, Hypericum sinaicum, Nepeta septemcrenata, Plantago sinaica, Origanum syriacum, Phlomis aurea, and Primula boveana. Germination treatments on Hypericum sinaicum seeds showed that calcium carbonate (CaCO3) and hot water of 50°C treatment was found to be most effective to improve seed germination depending on doses, while other treatments were efficient to a lesser degree. As a general conclusion, the present study clarified that the behaviour of endemic species along environmental gradients varies greatly, as well as in its strategies in struggling for existence.
Endemic
Hypericum sinaicum
Plantago sinaica
Saint Catherine
South Sinai
2015
01
01
11
26
https://cat.journals.ekb.eg/article_18010_f87cff4a567e45794b992753a9cf4166.pdf
Catrina: The International Journal of Environmental Sciences
1687-5052
1687-5052
2015
10
1
Estimation of the abundance of the spinner dolphin Stenella longirostris using photo identification technique in Samadai Reef, Red Sea, Egypt
Ahmed
Shawky
Magdy
Alwany
Saad
Zakaria
Salah
El-Etreby
Dolphins were photographed for individual identification purposes in Samadai reef, Marsa Alam, Red Sea between January 2012 and March 2013. In this study, 255 spinner dolphin Stenella longirostris were identified with a mean identification rate of 45%. Photo-identification analysis provided a population size range of 567 to 637 for spinner dolphins utilizing Samadai daytime for resting and socializing. From the 255 identified dolphins, 33 individuals (12.9%) were re-sighted for 4-8 times and 131 individuals (51.4%) were only observed once. The discovery curve indicated the continuous entrance of new animals to Samadai reef, which increased between May and December.
spinner dolphins
Stenella longirostris
Samadai Reef
Red Sea
photo ID
population size
2015
01
01
27
39
https://cat.journals.ekb.eg/article_18013_e6213d31278270d3fe68b62cbbae8d9a.pdf
Catrina: The International Journal of Environmental Sciences
1687-5052
1687-5052
2015
10
1
ECOLOGY OF SPIDERS AT QENA GOVERNORATE, EGYPT
Ahmad
Obuid-Allah
Amal
Mahmoud
ElAmier
Hussien
Spiders are one of the more diverse arthropod taxa, ranking seventh in global diversity, which makes them a fascinating group to study (Coddington, 1986). The Egyptian spider fauna still incompletely known due to scarcity of studies on this group especially in Upper Egypt. So, the present study was focused on Qena Governorate (15-260 N, 32-500 E) to make a survey of spiders in different habitats of this region and to study its abundance of this group as well as the effects of some physical factors on the abundance of the collected taxa. Samples were collected every 2 weeks during a period of one year (from February, 2012 till January, 2013) from six different sites covering Qena governorate. Sampling methods include hand picking, sweep net and pitfall trap. Also, physical factors (temperature, relative humidity, evaporation and wind velocity) were recorded during the period of study. Survey results revealed the occurrences of 1247 specimens belonging to 14 families that included 23 genera and 23species. Families recorded were: Agelenidae, Araneidae, Eutichuridae, Gnaphosidae, Linyphiidae, Lycosidae, Oecobiidae, Oxyopidae, Philodromidae, Pholcidae, Salticidae, Sparassidae, Theridiidae and Thomisidae. Family Salticidae was represented by the highest number of specimens during the whole period of study (22.29 % from the total number of collected taxa), while family Agelenidae was represented by the lowest number. The maximum number of spiders was collected during autumn (29.11 % from the total number) while the minimum number was collected during winter. By using statistical analysis, it could be concluded that the total relative abundance of all species was affected by temperature followed by relative humidity.
Ecology
Egypt
Qena Governorate
Spiders
2015
01
01
41
48
https://cat.journals.ekb.eg/article_18015_ea55e50801719fafc0aa880ee0d7558e.pdf
Catrina: The International Journal of Environmental Sciences
1687-5052
1687-5052
2015
10
1
Effect of Some Postharvest Treatments on Quality and Storability of Date Palm fruits Zaghloul and Samany Cultivars
Taha
El-Sharony
Osama
Amin
Ahmed
Abd-Allah
This experiment was carried out during two successive seasons (2012 and 2013) in the postharvest laboratory of Agricultural Development System (ADS) project in Faculty of Agriculture, Cairo University, Egypt on two date palm fruits cvs. Zaghloul and Samany harvested at full coloured stage (khalal) to investigate the efficiency of using some natural substances i.e. arabic gum at 10%, black cumin (Nigella sativa) oil at 1% as well as their combination besides untreated fruits as a control under cold storage on fruit quality of date palm fruits. The obtained results showed that, 10 % arabic gum + 1% black cumin oil and 1% black cumin oil succeeded in reducing weight loss and fruit decay percentages for Zaghloul date palm, while arabic gum at 10% and 10% arabic gum + 1% black cumin oil gave the lowest weight loss and fruit decay percentages in Samany date palm. However, the highest values of fruit firmness were scored by 10% arabic gum + 1% black cumin oil and black cumin oil at 1% for both cultivars.Coating date palm fruits with combination of arabic gum 10% + black cumin oil 1% or arabic gum10% only enhance of fruit chemical properties (total soluble solids and total sugar) However, While, there was no clear trend for treatments effect on fruit total acidity content for both cultivars under the study.
Arabic gum
Black cumin oil
Cold storage
date palm
fruit quality
2015
01
01
49
58
https://cat.journals.ekb.eg/article_18017_dfc82e1769440a667ff7d5e9a8ef9b48.pdf
Catrina: The International Journal of Environmental Sciences
1687-5052
1687-5052
2015
10
1
Influence of different intensities of magnetic field on germination, vegetative growth and some physiological aspects of salinity-stressed cucumber
Ali
Ibrahim
Two experiments were designed to investigate the effect of different static magnetic fields and 10% seawater stress on seed germination of cucumber (Cucumis sativus L. var. Beit Alpha), seedling vigour, vegetative growth and some biochemical aspects. Salinity stress reduced seeds germination, seedlings fresh mass and seedlings vigour by about 30%, 54%, and 70 % respectively. Moreover, salinity significantly reduced the depletion in seedling dry mass in comparison with control. The magnetic fields of 50 mT for ½ h and 100 mT for 30 s improved seed germination, seedlings fresh mass and seedlings vigour under salinity stress by about 30%, 50% and 150%, respectively in comparison with salinity treatment alone. Conversely, the dual treatment of 200 mT for 1/2 h and salinity stress had more reduction effect on cucumber than salinity alone. In general, the magnetic fields of 50 mT 30 s, 100 mT 1/2 h and 200 mT 30 s had a non significant effect on seed germination. Except for 50 mT 30 s intensity which had a promotive effect, the effect of all used magnetic fields on shoot biomass and chlorophylls content were comparable with those for seedlings fresh mass. The positive effect of magnetic fields seemed to be attributed to the enhancement in total amylase activity, soluble sugars, RNA, K+/Na+ ratio and chlorophylls level. On the contrary, magnetic treatments decreased peroxidase activity, total proteins and electrolytes leakage under salinity stress conditions. However, all magnetic intensities increased Fe content, in spite of being independent of magnetic intensity or exposure period.
Cucumber
Enzymes
Ferromagnetism
Germination
Growth
Leakage
protein
RNA
salinity
2015
01
01
59
67
https://cat.journals.ekb.eg/article_18018_c20847cc337bf6a1d58329c97ad10d2d.pdf