Tarek Gad El-Kareem IsmailSohag University Faculty of science
Tarek Gad El-Kareem Ismail
Ph. D. in Zoology
About
28
Publications
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52
Citations
Citations since 2017
Introduction
Publications
Publications (28)
Background
Isopods shape features are sensitive and respond to several selective pressures which may result in variations of these features. These pressures might reflect the heterogeneity of the environment where an animal lives. Land isopods Porcellionides pruinosus were collected from an agricultural field. Landmarks geometric morphometrics was...
Three pleurobranch species; Berthellina citrina (Ruppel and Leuckart, 1828), Pleurobranchus grandis (Pease, 1868) and Pleurobranchus albiguttatus (Bergh, 1905) were collected from seven sites in the upper intertidal zone, on the North Western Coast of the Red Sea; Egypt. They inhabit the lower surfaces of medium sized stones in pools containing wat...
The aquatic Acari are known as water mites and occupy a wide range of habitats. The freshwater mites, Unionicola aegyptiaca, were collected from the freshwater mussel, Caelatura aegyptiaca, River Nile, Sohag, Egypt. The present paper focuses on the structure of the cuticle and musculature of freshwater mite, U. aegyptiaca. Histologically, the cutic...
Abstract: The unionid freshwater mussel Nitia teretiuscula (Philippi, 1847) was collected from the River Nile at Sohag Governorate. Both the spatial and temporal distributions were investigated using a systematic sampling technique. In addition, the inter-relationships between the abundance of the studied species and some measured environmental fac...
The unionid freshwater mussel Nitia teretiuscula (Philippi, 1847) was collected from the River Nile at Sohag Governorate. Both the spatial and temporal distributions were investigated using a systematic sampling technique. In addition, the inter-relationships between the abundance of the studied species and some measured environmental factors was e...
The unionid freshwater mussel Nitia teretiuscula (Philippi, 1847) was collected from the River Nile at Sohag Governorate. Both the spatial and temporal distributions were investigated using a systematic sampling technique. In addition, the interrelationships between the abundance of the studied species and some measured environmental factors was ex...
This study gives highlights on the biodiversity of spiders in an olive trees orchard, a lemon trees orchard, and webs of Cyrtophora citricola at Jazirat Shandweel District, Sohag Governorate, Egypt. In addition, it gives a preliminary list of spiders based on the main taxonomic characters. The sampling was carried out weekly or monthly during the p...
Two oribatid mite species belonging to the genus Malaconothrus, namely Malaconothrus ramadani sp. n. and Malaconothrus transversus sp. n., were described as two new species. They were collected from the roots of the floating aquatic plant, Eichhornia crassipes in River Nile, Girga city, Sohag Governorate, Egypt. The first species, Malaconothrus ram...
Abstract: Spiders have an important role in the agroecosystems. They are effective in suppressing the pest populations as biological controllers. This study aimed to study the abundance, temporal distribution and diversity of spiders in an agriculture research site at Jazirat Shandweel, Sohag District, Sohag Governorate, Egypt. The sampling was car...
Spiders have an important role in the agroecosystems. They are effective in suppressing the pest populations as biological controllers. This study aimed to study the abundance, temporal distribution and diversity of spiders in an agriculture research site at Jazirat Shandweel, Sohag District, Sohag Governorate, Egypt. The sampling was carried out m...
The male genital system of the water mite, Unionicola aegyptiaca consists of an accessory gland, two spherical testes, two vasa deferentia, common vas deferens, an ejaculatory complex and spermatopositor (penis) and is supported with the male genital skeleton. It is evident that each testis is enclosed in a very thin amorphous layer (basal lamina)...
This study gives highlights on the biodiversity of spiders in an olive trees orchard, a lemon trees orchard, and webs of Cyrtophora citricola at Jazirat Shandweel District, Sohag Governorate, Egypt. In addition, it gives a preliminary list of spiders based on the main taxonomic characters. The sampling was carried out weekly or monthly during the p...
The hermit crab Clibanarius signatus Heller, 1861 inhabits varied intertidal habitats of the Red Sea coast, such as rocky shores and mangrove littoral salt marshes. Shield-shape variation among three populations of C. signatus was analyzed with geometric morphometric methods. Shape variation was studied through multivariate analyses using configura...
The oribatid mite Trimalaconothrus crassipes n. sp. was described for the first time from the roots of the floating aquatic plant, Eichhornia crassipes, River Nile, Girga, Sohag, Egypt. The present species has the characteristic features that are in accordance with those of family Malaconothridae and genus Trimalaconothrus. The present species has...
The present study dealt with the description of the reproductive and gametogenic cycles and the embryonic development of the freshwater mussel Nitia teretiuscula from the River Nile. Macro and micro-anatomy showed that the present species is dioceous and gonadosomatic indices showed that the species is semiannual and had two gonadal growth periods,...
The present study dealt with the description of the reproductive and gametogenic cycles and the embryonic development of the freshwater mussel Nitia teretiuscula from the River Nile. Macro and micro-anatomy showed that the present species is dioceous and gonadosomatic indices showed that the species is semiannual and had two gonadal growth periods,...
Mouth parts deformities in chironomid larvae are considered as indicators of environmental stress in aquatic systems caused by water and sediment pollution such as heavy metals, pesticides as well as organic contamination. Fourth instar chironomid larvae were collected from two sites (SI and SII) located in the River Nile, Sohag Governorate, Egypt....
Unionicola aegyptiaca was described for the first time from the freshwater mussel, Caelatura aegyptiaca, River Nile, Sohag, Egypt. The descriptive characters of the present species are in accordance with those of the superfamily, family and the genus. The present species has a specific characters compared with characters of other species of the sam...
Berthellina citrina (Rüppell and Leuckart, 1828) is a common Pleurobranchid gastropod in the intertidal area of the Red Sea. It has distinct color pattern variation from pale yellow, orange to red. The present study aimed to evaluate whether the variation of these color patterns are due to polymorphism, or may be speciation. Anatomically, the three...
Directional orientation of Clibanarius signatus toward different targets of gastropod shells was studied in a circular arena upon exposure to background seawater, calcium concentrations and predatory odor. Directional orientation was absent when crabs were presented with the white background alone. Each shell was tested in different positions (e.g....
The influence of shell status (size, quality and preferred type) on fighting behavior of the hermit crab Calcinus latens was examined. In the present species, the motivation to acquire a new shell is influenced by the value of its own shell rather than that of the rivals. The results suggest that crabs in suboptimal shells were more prone to initia...
The present work aims to study the spatial and temporal variation in the distribution and abundance of Leptochelia erythraea that were collected seasonally during the period July 2006 to April 2008 and the relationships between their abundance and the environmental variables in an intertidal flat on the NorthWestern Coast of the Red Sea, Egypt. Thi...
The present study describes some activity patterns in the field and laboratory of five hermit crab species (Calcinus latens, Clibanarius signatus, Clibanarius longitarsus, Diogenes costatus and Diogenes pallescens) inhabiting an intertidal flat of mangrove swamp at Red Sea coast. The recorded activity patterns were clustering, scattering, locomotio...
The amphipod Parhyale hawaiensis live hiding underneath stones and shingles along the shore line in supra-littoral zone of Sharm El-Nagha site, Hurghada city, Red Sea. The collected specimens of P. hawaiensis are infected with two protozoan parasites, Urosporidium sp. and Haplosporidium sp. which invade many organs of both females and males. The li...
The present work aims to assess the spatial distribution, analyze shell utilization, shell fitness and determine the effect of coexistence of two hermit crabs Calcinus latens and Clibanarius signatus on used shell resources in various habitats on the Red Sea Coast. Also, to determine the choice of shells and investigate the shell species preference...
Questions
Questions (4)
Dear all
The propodus segment of the crab's claw (chela) showed two distinct parts; manus and fixed finger (pollex). What is(are) the function(s) of each part? Or they do the same functions?
Thanks in advance for Answering my question.
Dear All
I work on asymmetry of R-L chelae in a hermit crab. I try to find how much each landmark participates in the overall variation. I find an unclear description (to me, I am not a mathematician) in Klingenberg & McIntyre 1998, Badyaev and Foresman 2000. I appreciate your help, If there is a simple example that I can follow, it will help me a lot.
I preparing a geometric morphometric work on an isopod species in Egypt. the procrustes ANOVA results give 00000 values with one of the parameters (i.e. sex). The article deals with shape changes in two populations. in the analysis, the population is the main effect (Extra 1), sex (Extra 2) and individuals is the random effect. I get the SS and MS for sex 00000. So, what is the problem? I need help in this point.
Thanks in advance
the results are:
Centroid size:
Effect SS MS df F P (param.)
Population 1795651.412017 359130.282403 5 7.46 <.0001
Sex 0.000000 0.000000 2 0.00 1.0000
Individual 9726394.536099 48150.468000 202 3709.53 <.0001
Error 1 2699.886705 12.980225 208 0.25 0.9812
Residual 105.123498 52.561749 2
It is difficult to determine age of crustaceans since they have no fixed structure throughout their life. however, future or present investigations may solve this issue.
Projects
Project (1)
1. Evaluate synanthropic flies as vectors for pathogens (bacteria).
2. Determine the susceptible and resistance of the bacteria isolated from flies to different antibiotics.
