Browsing by Author "Özgökçe, M.S."

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Age-Stage, Two-Sex Life Table: the Basis of Population Ecology, Biological Control and Pest Management
(Centenary University, 2018) Atlihan, R.; Özgökçe, M.S.; Chi, H.
Because they are capable of providing an integrated and comprehensive description of numerous biological parameters (survival, development, fecundity, etc.) of a population, life tables are one of the most powerful tools available for biologists and other researchers conducting research on population ecology, biological control, and pest management. Since the traditional female age-specific life tables ignore the male population and stage differentiation, their use often results in errors and inaccuracies. This article was prepared to discuss the reasons and advantages of using the age-stage, two-sex life table. © 2018, Centenary University. All rights reserved.
The Biological Indicator Values of Notonecta Viridis Delcourt, 1909 (Hemiptera: Notonectidae) and Some Chironomidae (Diptera) Species in the Van Lake Shore Habitats
(Centenary University, 2018) Dilmen, H.; Özgökçe, M.S.
Biological indicator values of Notonecta viridis Delcourt, 1909 (Hemiptera: Notonectidae), Microchironomus deribae (Freeman, 1957), Halocladius fucicola (Edwards, 1926), Cricotopus spp. and Chironomus sp. (Diptera: Chironomidae), which are commonly detected along the coastline, were used to identify the habitats of the Lake Van shoreline. The studies were carried out between May-October 2011 on the entire Van Lake shoreline. The pH, temperature, salinity, Nitrogen, Ammonium, Copper, Iron, Chlorine, Manganese, Potassium values of the water were measured in the samples as well as larva and nymph densities. Among the species identified in the samples, M. deribae was considered as a new record for the Van Lake. According to the analysis, it was determined that the indicator values of Ammonium, Nitrogen, Copper, Chlorine, Manganese and salinity is important in some sampling stations and it has been determined that species affect population densities. Cricotopus spp was found to be a bioindicator of the Altınsaç habitat, whereas the M. deribae and N. viridis were found as the bioindicator of Yolçatı habitat. © 2018, Centenary University. All rights reserved.
Determination of Harmful and Beneficial Predator Insect Species and the Distribution and Density of Eurygaster Integriceps Puton (Hemiptera: Scutelleridae) in Wheat-Cultivated Areas of Siirt Province
(Plant Protection Central Research Institute, 2023) Dilmen, H.; Kaplan, C.; Özgökçe, M.S.; Çiftçi, M.C.; Özer Dilmen, M.; Pala, F.; Kaplan, M.
Wheat is nowadays the most important source of food on earth. Many pest species have been identified that affect wheat yield and quality negatively. This study was conducted to identify harmful and beneficial insect (predator) species and of the distribution of Sunn pest in wheat cultivation areas in the districts (Siirt province Merkez, Kurtalan, Eruh, Tillo, Şirvan, Pervari, and Baykan) of Siirt Province, Türkiye in 2018 and 2019. Samplings were taken periodically for 1-2 weeks from April to July. The sweep nets, frame, pitfall trap, and visual control methods were used for sampling. At the end of the study, 42 species belonging to 6 orders and 25 families were determined. The distributions of the species were recorded as 27 species belonging to 12 families in Coleoptera, 10 species belonging to 7 families in Hemiptera, 2 species belonging to 2 families in Neuroptera, and 1 species belonging to each family in Hymenoptera, Orthoptera and Diptera. The most common and abundant species: the main pest Eurygaster integriceps Puton, 1881 (Hemiptera: Scutelleridae), the secondary pests Aelia acuminata (Linnaeus, 1758), Dolycoris baccarum (Linnaeus, 1758) (Hemiptera: Pentatomidae), Cephus pygmaeus (Linnaeus, 1767) (Hymenoptera: Cephidae) Gryllus bimaculatus De Geer, 1773, (Orthoptera: Gryllidae) were determined. In the study, a total of 16 species were identified, which is the first record for the local fauna of Siirt province. The highest average density of E. integriceps (2 adult + nymph/m2) was found in the Garzan and Gozpinari locations of the Kurtalan district. Besides, among the beneficial species, general predators Chrysoperla carnea (Stephens, 1836) and Coccinella septempunctata (Linnaeus, 1758) are remark as the most common species. © 2023, Plant Protection Central Research Institute. All rights reserved.
Distribution and Dna Barcoding of Anomalini Beetles (Coleoptera: Scarabaeidae: Rutelinae) in Wheat Fields of Van, Türkiye
(Centenary University, 2024) Özgökçe, M.S.; Göksugüzel, G.; Kara, H.; Rişvanli, M.R.; Doğaç, M.
Anomalini beetles (Coleoptera: Scarabaeidae: Rutelinae) constitute an important group of pests causing significant crop losses in wheat cultivation areas worldwide, including Türkiye. The aim of this study was to comprehensively evaluate the phylogeny, diversity, abundance, and distribution of Anomalini beetles in wheat fields of Van province, Türkiye. Surveys were conducted between April and August 2021, involving monthly sample collection at predetermined locations within six districts: Başkale, Çaldıran, Erciş, Gevaş, İpekyolu, and Tuşba. A Standard sweepnet with a diameter of 35 cm was used to collect samplings. In molecular studies, the mitochondrial COI gene region has been amplified and sequenced using universal primers. Anomalini beetles were detected in all sampling areas except Çatak district. Seven species were identified: Anisoplia austriaca, A. signata, A. lata, Brancoplia leucaspis, Blitopertha nigripennis, Chaetopteroplia segetum, and an unidentified Anisoplia sp. Chaetopteroplia segetum emerged as the most prevalent and abundant species across all districts. Notably, all identified Anomalini species represent the first records for Van province and its environs. While Anomalini beetles were present in the region, their population densities were not considered high enough to cause economic damage. © 2024, Centenary University. All rights reserved.
The Distribution and Habitat of Calomera Littoralis Mandli (Mandl, 1967) (Coleoptera: Cicindelidae) on the Coastal Margin of Lake Van in Turkey
(2006) Özgökçe, M.S.; Atlihan, R.; Kasap, İ.; Özgökçe, F.; Yıldız, Ş.; Demir, M.; Polat, E.
The tiger beetle Calomera littoralis mandli was found at Lake Van in eastern Anatolia at 20 out of 47 localities surveyed during 2004–2005. It occurs in open habitats with fine sand mixed with clay or in salt-marshes and with little plant cover. Three groups of larval burrows were determined, with average openings of 1.54 mm, 2.46 mm and 3.80 mm. These correspond to the 1st, 2nd and 3rd larval instars. © 2006 Taylor & Francis Group, LLC.
Estimating Population Size and Some Demographic Parameters of Citrus Mealybug, Planococcus Citri (Risso) (Hemiptera: Pseudococcidae) on Cucurbita Moschata Duch. in Laboratory Conditions
(Centenary University, 2021) Özgökçe, M.S.; Kara, H.; Kina, E.; Başi, F.H.
Planococcus citri is an important pest that is common in many parts of the world and feeds on more than 200 plant species. It attacks the leaves, shoots and fruits of the pumpkin (Cucurbita moschata) plant, which is among its hosts, causing significant crop losses. In this study, development, survival and fecundity data of P.citri were obtained on the leaves of the pumpkin plant were in the climatic room which was adjusted to 28 ± 1 °C temperature, 60 ± 5% relative humidity and 16: 8 light: dark conditions. The raw data obtained were tested according to the age-stage twosex life table and the life table parameters were calculated using the Twosex MSChart package program. Accordingly, they were calculated as follows; the intrinsic rate of increase (r) = 0.0802 d-1, the finite rate of increase (λ) = 1.0836 d-1, the net reproductive rate (R0) = 29.231 eggs, and the mean generation time (T) = 42.10 days. In addition, the population size of the pest was estimated using the Timing MSChart program. According to this, when 10 P. citri eggs were taken as the initial population, it was estimated that the population that could occur at the end of 3 months would be 4 137 individuals in total. © 2021, Centenary University. All rights reserved.
Geographical Spatial Distribution and Population Density of Wheat Stem Sawfly, Cephus Pygmeus, in Wheat Fields in Southeastern, Eastern, and Northeastern Regions of Türkiye
(Centenary University, 2023) Kara, H.; Özgökçe, M.S.
The wheat stem sawfly (Cephus pygmeus) is a major pest of wheat crops in many regions of the world, including Eastern Türkiye. This study aimed to investigate the spatial distribution and population density of wheat stem sawfly in Eastern Türkiye and to evaluate the damage caused by this pest on wheat yield and quality. A total of 120 wheat fields were surveyed in six provinces of Eastern Türkiye during the 2018 growing season. The results showed that the population density of wheat stem sawflies varied significantly among the surveyed fields, with an average infestation rate of 37.4%. The highest infestation rate was recorded in the province of Kilis (62.5%) and Diyarbakır (61.9%), while the lowest was in the province of Ağrı (8.3%). The study also identified some factors that affect the population density of wheat stem sawflies, including host plants (mainly wheat, barley, and rye), altitude, temperature, and geographical structure such as mountains and forests. These findings provide valuable information for developing effective management strategies to control wheat stem sawfly populations and minimize the damage caused by this pest in Eastern Türkiye, especially Southeastern Anatolia Region. © 2023, Centenary University. All rights reserved.
Harmful and Beneficial Insect Species and Their Distributions in Wheat Areas in Van Province
(Centenary University, 2022) Özgökçe, M.S.; Kara, H.; Başi, F.H.; Kina, E.
Wheat is one of the most important crops globally in cultivation and production. Insects, which are among the factors that cause quality and quantity losses in wheat production, are among the pest groups that should be monitored and kept under control. This study was carried out in Van province and its districts (Bahçesaray, Başkale, Çaldıran, Çatak, Edremit, Erciş, Gevaş, Gürpınar, Muradiye, Özalp, Saray and Tusba) in May-August 2017 and insect species found in wheat fields were determined. The samplings of harmful and beneficial species were carried out using standard sweep nets and by hand collection. At the end of the study, 66 species belonging to 7 orders and 39 families were found in 165 different localities. Distributions of the species were recorded as 26 species belonging to 12 families in Coleoptera, 19 species belonging to 10 families in Hemiptera, 9 species belonging to 8 families in Diptera, 6 species belonging to 5 families in Hymenoptera, 2 species belonging to 2 family in Orthoptera, 2 species belonging to 1 family in Neuroptera, and 1 species in Thysanoptera. With this study, for the first time, comprehensive information was obtained about the pest species found in the wheat fields in and around Van, their distributions, densities, and the presence of their natural enemies in the region. © 2022, Centenary University. All rights reserved.
The Life Table of Cryptolaemus Montrouzieri Mulsant (Coleoptera: Coccinellidae) After Different Storage Periods
(WFL Publisher Ltd., 2006) Özgökçe, M.S.; Atlihan, R.; Karaca, I.
The life table of Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) was calculated on Planococcus citri (Risso) (Homoptera: Coccidae) under laboratory conditions at 25±1°C and 45±5% relative humidity after different storage periods at 15°C of cooling. Experiments consisted of 5 groups including a control and design experiments that were run for 5, 10, 15 and 20 days, respectively. The following predictive parameters were obtained for the control and design experiments: intrinsic rate of increase rm = 0.098, 0.092, 0.074, 0.058 and 0.045; net reproductive rate R0 = 340.703, 276.629, 149.930, 119.321 and 65.928; mean generation time T0 = 59.350, 60.851, 67.726, 83.189 and 94.173, respectively. Doubling time DT = 7.2, 7.9, 9.3, 12.1 and 15.3, and finite rate of increment λ = 1.101, 1.092, 1.074, 1.059 and 1.046, were calculated as well. The reproductive value (Vx) for each group was plotted.
Maternal Age Effects on Fecundity and Survival of Aphis Fabae Scopoli (Hemiptera: Aphididae) on Bean
(Entomological Society of Turkey, 2015) Yüztaş, G.; Karaca, I.; Özgökçe, M.S.
In this study, the effects of maternal age on development, fecundity, longevity, generation time, preoviposition, oviposition and postoviposition times and survival rate of bean aphid, Aphis fabae Scopoli (Hemiptera: Aphididae) were investigated. At the experiments, four different populations generated by 1, 6, 11, and 16 days old mother were used. For each experiment group, 45 replicates were used and bean leaves were used as host plant for aphid population. Experiments were carrried out at 27±1° C, 60±5% r.h. and 16:8 L:D photoperiod in a climate chamber. Data obtained for each populations were evaluated according to the age-dependent life tables. Calculation of life table parameters were made by using Euler-Lotka equation. Values obtained for intrinsic rate of increase (rm), net reproductive rates (Ro), mean generation time (To), gross reproductive rate (GRR) and finite rate of increase (λ) were 0.369, 0.389, 0.349 and 0.149 females/female/day; 16.466, 14.535, 7.802 and 2.233 females/female, 7.599, 6.873, 5.893 and 5.388 days, 37.611, 28.126, 20.265 and 16.000 females/female, 1.446, 1.476, 1.417 and 1.161 females/days respectively for Aphis fabae populations formed by 1, 6, 11 and 16 days old mothers. Preoviposition period values for all experiment groups were zero. Values obtained for adult life times, oviposition period, postoviposition period and generation time were 6.4, 6.8, 2.6 and 0.4 days,6.2, 8.3, 2.4 and 0.4 days, 0.2, 0.2, 0.1 and 0 days, 7.0, 7.2, 5.9 and 4.8 days respectively,for the aphidpopulations generated by 1, 6, 11 and 16 days aged mothers. Best fit curves were obtained by using Weibull distribution for age dependent survivals (lx) of each populations, and their parameters were calculated. According to parameters calculated in Weibull distribution, it was found that 1. and 2. age group populations were suitable to Holling's type 1 life curve and 3. and 4. age group populations were suitable to type 3 life curve. © 2015, Entomological Society of Turkey. All rights reserved.
Molecular Phylogeny and Population Structure of Eurygaster Integriceps (Hemiptera: Scutelleridae) in the Southeastern Anatolia Region of Türkiye
(TUBITAK, 2025) Özgökçe, M.S.; Doğaç, M.; Kara, H.
The aim of this study was to determine the identity and distribution of the sunn pest Eurygaster spp. and to quantify the population density in wheat fields across Southeastern Anatolia, Türkiye. A total of 309 samples were collected from 76 fields in 54 districts across all provinces within the study region, where wheat production is intensive. A combination of morphological and molecular techniques was employed to identify the collected specimens. Morphological identification was based on male genitalia, and PCR amplification of the COI mitochondrial gene region was used for DNA barcoding. Both morphological and molecular analyses confirmed that all collected samples belonged to the species Eurygaster integriceps, revealing five distinct morphotypes and 17 haplotypes. The results indicate that the sunn pest is widespread across all provinces in the Southeastern Anatolia region. Among these provinces, Gaziantep exhibited the highest pest density, whereas Siirt had the lowest. Morphologically, 46.27% of the samples exhibited a distinctive contrast pattern on the scutellum—a feature previously associated with increased pesticide resistance. Combined morphological and molecular analyses confirmed the presence of E. integriceps in all sampled wheat fields, revealing that it is widely distributed in Southeastern Anatolia and has varying population densities among provinces. The combined use of morphological and molecular identification techniques provided a comprehensive understanding of E. integriceps populations. Morphological analysis enabled the identification of distinct morphotypes, while molecular analysis confirmed species identity and revealed genetic diversity within the population, providing essential baseline information for accurate identification and the development of effective pest management strategies. © TÜBİTAK.
Zooplankton Composition of Van Lake Coastline in Turkey
(Academic Journals, 2010) Yildiz, S.; Özgökçe, M.S.; Özgökçe, F.; Karaca, I.; Polat, E.
This study was completed with periodical surveys in coastal band of Van Lake between May and September in 2005 to 2006 period. It was carried out on a total of 20 sites selected as sampling points and having three distinct characteristics. During the study, a total of 20 species (14 belonged to genus of Rotifera, 4 to Copepoda and 2 Branchiopoda) were found at the Van Lake coastal zone. Genera Notholca squamula, Keratella quadrata, Colurella colurus, Lecane ohiensis, Lecane grandis and Lecane lamellata have been detected for the first time at the Van Lake coastal zone. © 2010 Academic Journals.