Yazar "Bozkurt, Ahmet" seçeneğine göre listele
Listeleniyor 1 - 20 / 29
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Asi Nehri (Hatay-Türkiye) zooplankton süksesyonu(2010) Bozkurt, Ahmet; Güven, Süleyman ErtuğrulAsi Nehri zooplankton süksesyonu ve tür çeşitliliğini araştırmak için haftalık örneklemeyle, 12.05.2005-05.05.2006 tarihleri arasında yapılan çalışmada Rotifera’dan 58, Kladosera’dan 16 ve Kopepoda’dan 15 olmak üzere toplam 89 takson tespit edilmiştir. Çalışma süresince her ay bulunan türlerin Rotaria rotatoria (Pallas, 1766), Brachionus calyciflorus (Ehrenberg, 1838), Cephalodella gibba (Ehrenberg, 1838) (Rotifera), Ilyocryptus sordidus (Lievin, 1848) (Kladosera) olduğu tespit edilmiştir. En çok zooplankton türü (50 tür) Mart ayında bulunmuş, Eylül ayında ise 45 türle ikinci bolluğunda bulunurken, 20 tür ile en az Ağustos ayında bulun-duğu tespit edilmiştir. Ayrıca Brachionus (9 tür), Lecane (8 tür), Keratella (5 tür)’nın çalış-mada en yaygın bulunan cinsler oldukları tespit edilmiştir. En çok bulunan türlerin Rotifera’dan B. angularis (188±17.68), Euchlanis dilatata (150 ±23.33), B. calyciflorus (129 ±14.14), Kladosera’dan Moina micrura Kurtz, 1874 (143 ±3.54), Chydorus sphaericus (101 ±27.58), Simocephalus vetulus Muller, 1776 (100 ±46.67), Kopepoda’dan Eucyclops speratus (Lilljeborg 1901) (218 ±6.36), Nitocra hibernica (Brady, 1880) (91±7.78) oldukları belirlen-miştir. Toplam zooplankton ise yıllık olarak en çok 1897 adet/20L ile Mayıs ayında bulunmuş, Eylül ayında 1514 adet/20L ile ikinci bolluğuna ulaşmış, en az ise Ocak ayında (379 adet/20L) bulunmuştur. Sıcaklık ile R. neptunia (R2 =0.65), B. angularis (R2 = 0.71), B. calyciflorus (R2 = 0.77), B. urceolaris (R2 = 0.82), B. quadridentatus (R2 = 0.58), Asplanchna sieboldi (R2 = 0.82), Polyartra dolichoptera (R2 = 0.56), Cephalodella gibba (R2 = 0.54), F. longiseta (R2 = 0.85) (Rotifera), Alona rectangula (R2 = 0.66) (Kladosera), Megacyclops viridis (R2 = 0.57), Eudiaptomus drieschi (R2 = 0.81) ve Nitocra hibernica (R2 = 0.59) (Kopepoda) türleri arasın-daki ilişki seviyesinin pozitif ve yüksek olduğu tespit edilmiştir.Öğe Birecik baraj gölü zooplaktonunun vertikal dağılımı(2008) Bozkurt, Ahmet; Sagat, YusufBu çalışmada Birecik Baraj Gölü'nün zooplankton faunası araştırılmıştır. Çalışma sonucunda rotiferden 21, kladoserden 11 ve kopepoddan 7 olmak üzere toplam 39 tür belirlenmiştir. Rotifer türleri tüm su kesiminde bulunmakla beraber, daha çok yüzeye yakın yerlerde dağılım göstermiştir. Kladoser türlerinin daha çok orta su ve yüzeye yakın; kopepod türlerinin ise dibe yakın kısımlarda dağılım gösterdikleri belirlenmiştir. Ayrıca baraj gölündeki bazı su kalite parametreleri de (pH, EC, nitrat, potasyum, kalsiyum, mağnezyum, karbonat, bikarbonat, sülfat, organik madde, amonyak, nitrit, O - fosfat, çözünmüş oksijen, sertlik, sıcaklık) belirlenmiş olup bunların normal su kriterleri değerleri içerisinde oldukları tespit edilmiştirÖğe A checklist of Turkish rotifers(2012) Ustaoğlu, Mustafa Ruşen; Altındağ, Ahmet; Kaya, Murat; Akbulut, Nuray; Bozkurt, Ahmet; Özdemir Mis, Didem; Atasagun, Sibel; Erdoğan, Sevil; Bekleyen, Aysel; Saler, Serap; Okgerman, Hacer CananIn a book chapter containing the first checklist and distribution of Turkish rotifers, published in 1999, were listed 167 taxa. The second checklist, published in 2004, reported 229 rotifer taxa in Turkey. During the 7 years since this checklist process, many studies have been carried out and we have prepared a new checklist of Turkish rotifers in the present study. In all, 341 rotifer taxa have been recorded to date.Öğe Cladocera and copepoda fauna of Aslantaş Dam Lake (Osmaniye-Turkey)(2009) Bozkurt, Ahmet; Göksu, Münir Ziya Lugal; Altun, AyhanQuantitative and qualitative examinations of zooplankton in Aslantaş Dam Lake were studied between April 2001 and March 2002. It was established that total zooplankton in the reservoir is being represented with 18 species belonging to Cladocera and Copepoda. Number of the species belonging to cladocer and copepod are 14 and 4, respectively. Contrary to the number of species, abundance was found to be in favor of copepods (65.99% of total zooplankton). Remaining one third of total zooplankton (34.01%) was cladocerans. The most abundant species were determined as Bosmina longirostris among cladocerans and Thermocyclops vermifer persicus (Lindberg, 1936) among copepods. Monthly depth of light penetration zone (photic zone) was calculated using Secchi disk readings. It was observed that the copepods were more abundant than the cladocerans in the light penetration zone (photic zone). Beyond the light penetration zone the situation was reversed and the cladocerans were found to be more abundant than the copepods. Chlorophyll-a level was also examined in the lake. Since this study is the very first study carried out on the zooplankton of Aslantaş Dam Lake, all of the species observed are the first reports for Aslantaş Dam Lake.Öğe Composition and vertical distribution of rotifera in Aslantas dam lake (Osmaniye-Turkey)(2010) Bozkurt, Ahmet; Göksu, Münir Ziya LugalRotifera composition and vertical distribution in Aslantas Dam Lake was studied from April 2001 to March 2002. It was established that the rotifera were represented by 33 species and 2 subspecies in the lake. Total average density of the rotifera was found to be 255883 Rotifer/m3. Species such as Keratella cochlearis cochlearis, K. cochlearis tecta, Polyarthra dolichoptera, Trichocerca capucina and Asplanchna priodonta were present througout the year. The analysis for the determination of vertical distribution of Rotifera showed that the most abundant species at surface and below surface was P. dolichoptera with 34.59%, and K. cochlearis cochlearis with 29.29%, respectively. Rotifera had the highest density at 5 m in the lake. In addition, 63.58% of total Rotifera was observed in photic zone while the rest (36.42%) was collected from aphotic zone. Chlorophyll a measurement of the dam lake showed that the average montly values were 31.44 mg/m3 at the surface and 20.13 mg/m3 below the surface. A vertical increase at the value of chlorophyll a was observed from the surface to 7.5 m. Gradual decrease at the value was recorded exceeding the depth of 7.5 m.Öğe The determination of body size and eggs number of Zooplankton (Rotifera, Cladocera and Copepoda) in Tahtaköprü dam lake (Gaziantep, Turkey)(2016) Bozkurt, Ahmet; Ülgü, Mitat; Duysak, ÖnderÇalışma, Tahtaköprü Baraj Gölü'nde Mart 2007-Şubat 2008 tarihleri arasında yürütülmüştür. Çalışmada rotifer, kladoser ve kopepod boy uzunluğu ve yumurta sayısı aylık olarak araştırılmıştır. Rotifer, kladoser ve kopepod türlerinin yıllık ortalama boy uzunluğunun soğuk kış mevsiminde yüksek, sıcaklığın kısmen yüksek olduğu sonbaharda ise düşük olduğu belirlenmiştir. Rotifer türlerinin yumurta miktarları en çok şubat ayında (1,79±1,030 adet), en az aralık ayında (1±0 adet) belirlenmiştir. Kladoser yumurta miktarları sıcak yaz aylarında çok (ağustos, 2,09±1,014 adet), soğuk kış aylarında ise az miktarda (şubat, 1,20±0 adet) olduğu tespit edilmiştir. Kopepod yumurta miktarı aralık ayında en çok (80,67±1,154 adet), ekim ayında ise en az (14,75±3,594 adet) olduğu tespit edilmiştirÖğe Effects of preservation methods on the ? 13c and ? 15n signatures in muscle tissues of two freshwater fish species(2011) Akin, Şenol; Şahin, Cemalettin; Turan, Davut; Gözler, Ahmet Mutlu; Verep, Bülent; Bozkurt, Ahmet; Çelik, KemalStable isotope is a powerful method for characterizing flows of energy through ecosystems. The power of this method, however, may be affected by preservation methods of the samples. We investigated the effects of four common preservatives (salt, formalin, and ethanol and freezing [control] and preservation duration (six and three months) on ? 15N and ? 13C values of two freshwater fish species, Perca fluviatilis (perch) and Blicca bjoerkna (silver bream). Six-month preservation caused little enrichment in ? 15N of both species compared to three month but had almost the same effects on ? 13C values of both species as in three-month preservation. All methods caused significant shifts (enrichment) in ? 15N of both species, and the effects in general were greater in perch (range: 0.28‰-2.19 ‰) than in bream (range: 0.31‰-1.29‰), which suggested that preservative induced shifts in ? 15N was species-specific. The methods caused little enrichment (ethanol-range: 0.03‰-0.26 ‰ bream and 0.30‰-0.48 ‰ perch and salt: 0.18 ‰ perch three month) and depletion (salt-range: 0.03 ‰0.13‰ bream and 0.13‰ perch six month) in ? 13C. Of the preservatives, however formalin had significant but consistent effects on ? 13C in both species (-1.27‰ and -1.25‰) for the entire preservation duration. Preservation-induced shifts in ? 13C were consistent in direction and magnitude for both species. The results suggested that ethanol and salt could be used without correction factor and formalin with correction factor for preservation of samples solely in ? 13C studies.. For the studies requiring use of carbon and nitrogen together, however, ethanol at least six month in preservation may be suitable for storing samples when considering detection of changes less than 2 ‰ is required in ecological applications. © by PSP.Öğe EFFECTS OF PRESERVATION METHODS ON THE ?13C AND ?15N SIGNATURES IN MUSCLE TISSUES OF TWO FRESHWATER FISH SPECIES(Parlar Scientific Publications (P S P), 2011) Akin, Senol; Sahin, Cemalettin; Turan, Davut; Gozler, Ahmet Mutlu; Verep, Bulent; Bozkurt, Ahmet; Celik, KemalStable isotope is a powerful method for characterizing flows of energy through ecosystems. The power of this method, however, may be affected by preservation methods of the samples. We investigated the effects of four common preservatives (salt, formalin, and ethanol and freezing [control] and preservation duration (six and three months) on delta N-15 and delta C-13 values of two freshwater fish species, Perca fluviatilis (perch) and Blicca bjoerkna (silver bream). Six-month preservation caused little enrichment in delta N-15 of both species compared to three month but had almost the same effects on delta C-13 values of both species as in three-month preservation. All methods caused significant shifts (enrichment) in delta N-15 of both species, and the effects in general were greater in perch (range: 0.28 parts per thousand-2.19 parts per thousand) than in bream (range: 0.31 parts per thousand-1.29 parts per thousand), which suggested that preservative induced shifts in delta N-15 was species-specific. The methods caused little enrichment (ethanol-range: 0.03 parts per thousand - 0.26 parts per thousand bream and 0.30 parts per thousand-0.48 parts per thousand perch and salt: 0.18 parts per thousand perch three month) and depletion (salt-range: 0.03 parts per thousand-0.13 parts per thousand bream and 0.13 parts per thousand perch six month) in delta C-13. Of the preservatives, however formalin had significant but consistent effects on delta C-13 in both species (-1.27 parts per thousand and -1.25 parts per thousand) for the entire preservation duration. Preservation-induced shifts in delta C-13 were consistent in direction and magnitude for both species. The results suggested that ethanol and salt could be used without correction factor and formalin with correction factor for preservation of samples solely in delta C-13 studies.. For the studies requiring use of carbon and nitrogen together, however, ethanol at least six month in preservation may be suitable for storing samples when considering detection of changes less than 2 parts per thousand is required in ecological applications.Öğe Feeding habits of introduced European perch (Perca fluviatilis) in an impounded large river system in Turkey(Academic Journals, 2011) Akin, Senol; Sahin, Cemalettin; Verep, Bulent; Turan, Davut; Gozler, Ahmet Mutlu; Bozkurt, Ahmet; Celik, KemalThe feeding habits of perch (Perca fluviatilis) were documented by analyzing gut contents of more than 3300 specimens collected seasonally at nine stations located along the impounded large river in Turkey. Perch largely preferred fish (36%), insects (54%), other crustaceans (16%) and daphnia (13%). Spatial analysis showed that perch substantially preferred fish in the river section above the dam lakes and insects, crustacean and fish in the river section below the dam lake and in dam lakes. The perch at every size seemed to prefer fish with the highest and lowest percentage obtained for 0 to 80 and 141 to 200 mm. Insects and crustaceans were important for 81 to 140 mm and 0 to 120 mm length, respectively. Crustaceans were important in June, November and July. Insects and fish except for June 2009 constituted an important portion of the diets during every sampling month. The perch showed a piscivory feeding habit, a result obtained by trophic level calculated by stomach contents (3.87) and stable isotope (3.91) methods. Trophic level change little during the ontogeny with relatively higher value obtained for the larger length. The perch inhabiting in the river section above the dam lakes had the highest trophic level compared to the other sites. Diet breadth of perch was lower and higher for larger and middle length (101 to 140 mm), respectively. The diet breadth was higher in dam lakes, indicating opportunistic feeding habits in lakes. Being the most abundant fish species in the study system and showing predatory feeding habits suggested that perch may have an effect on local fish assemblage and itself through predation.Öğe First record of Eudiaptomus gracilis (G.O. Sars, 1863) (Copepoda: Diaptomida) in the inland waters of Turkey(2012) Bozkurt, Ahmet; Akın, ŞenolKalanoid kopepod Eudiaptomus gracilis (G.O. Sars, 1863), Türkiye içsularında ilk kez kaydedilmiştir. Dişi ve erkek E. gracilis altı örnekleme döneminde sürekli bulunmuştur. Tür, Karadeniz Bölgesinde bulunan Yeşilırmak, Suat Uğurlu ve Hasan Uğurlu Baraj Gölleri’nden toplanmış ve her iki eşeyin detaylı çizimleri verilmiştir.Öğe First record of Eudiaptomus gracilis (GO Sars, 1863) (Copepoda: Diaptomida) in the inland waters of Turkey(Tubitak Scientific & Technological Research Council Turkey, 2012) Bozkurt, Ahmet; Akin, SenolThe Calanoid copepod Eudiaptomus gracilis (GO. Sars, 1863) is recorded from Turkish inland waters for the first time. Males and females of Eudiaptomus gracilis were consistently found during 6 sampling periods in the Yesilirmak River. The species was collected from the Yesilirmak River and Suat Ugurlu and Hasan Ugurlu dam lakes in the Black Sea region and detailed descriptions of both sexes are given.Öğe FIRST RECORD OF THE EPIBIONT PROTOZOAN EPISTYLIS SP ON ZOOPLANKTON (COPEPODA, CLADOCERA, AND ROTIFERA) FROM THE ASI RIVER, TURKEY(Brill Academic Publishers, 2009) Bozkurt, Ahmet; Genc, ErcumentBased on preliminary evidence (collected by us early 2005) of Epistylis infection of zooplankton, we investigated the prevalence of epibionts on various groups of metazooplankton with regard to Epistylis in the Asi River, north-eastern Mediterranean, Turkey. This study presents a detailed record of that ciliate protozoan on zooplankton from the Asi River in 2005-2006. Copepods, cladocerans, and rotifers were monthly sampled in the study period. The colonial Epistylis sp. was found on various groups: rotifers were the most abundant metazooplankton group (58 species out of a total of 89 zooplankton species) but the results show that copepods are the preferred substratrum for Epistylis sp., followed by cladocerans and rotifers. The highest densities of infected zooplankton were observed in December (116 ind. 20 L(-1)), then in May (92 ind. 20 L(-1)). Also October (91 ind. 20 L(-1)), and November (83 ind. 20 L(-1)) were associated with high zooplankton densities, possibly due to the increase in adhesion surface. The density of infected zooplankton was found to be positively correlated with zooplankton richness. The zooplankton infection in the Asi River constitutes the first record for Turkish inland waters of Epistylis sp., with the exception of a previous record for Cyclops vicinus Uljanin, 1875.Öğe Morphologic divergence and systematic relationship of copepod in Turkish freshwater(Universitatea din Oradea, 2015) Bozkurt, Ahmet; Turan, Cemal; Erguden, DenizThe pattern of taxonomic relationship and morphological divergence of three copepod species Thermocyclops crassus, T. dybowskii and T. vermifer collected from three different localities in Mediterranean region of Turkey were investigated. A multivariate ANOVA using morphometric characters revealed highly significant intersample variation for most of the characters between species. In discriminant function analyses, the first discriminant function accounted for 65% and the second accounted for 35% of the between-group variability, showing clear between-species differentiation. Component loadings of discriminating variables showed that thorax segments of cephalothorax played an important role to discriminate Thermocyclops species. The Neighbour-joining analysis produced two main clustering, T. vermifer was closest taxa to T. dybowskii being the sister group to the T. crassus which was the most divergent in this group. In the correct assignment of individuals into their original sample, the proportion of correctly classified T. crassus to their original group was highest (100%), showing a clear separation from the other species. © Biharean Biologist, Oradea, Romania, 2015.Öğe Prey selection and diet composition of larval pike, esox lucius l., 1758, in lake isaszeg, Hungary(Parlar Scientific Publications, 2017) Demirci, Sevil; Gokcek, Kaya; Bozkurt, Ahmet; Szabo, Tamas; Urbanyi, BelaIii this study. Northern Pike larvae's digestive tract contents were examined inhabiting in Isaszeg reservoir lake. Hungary. In totally 19 thousand varieties of nutrients were found out. 12 of them derived from zooplankton and 7 of them from phytoplank- Ton. Northern Pike larvae's constitutive nutriment sources were zoological originated. Geometric Importance Index (Gil) were highest for Bosmina sp. with 1097.49 in this specie's larval nutrition. This was followed by Chydorus sp. (503.836) and Ther- mocyclops sp. (493.299) respectively. Pike starts to exogenous feeding at 12 mm length. In contrast to GII. Selectivity index (SI) were revealed that Ther- mocyclops sp. were preferred by pike larvae as the main food organism. © by PSP.Öğe PREY SELECTION AND DIET COMPOSITION OF LARVAL PIKE, ESOX LUCIUS L., 1758, IN LAKE ISASZEG, HUNGARY(Parlar Scientific Publications (P S P), 2017) Demirci, Sevil; Gokcek, Kaya; Bozkurt, Ahmet; Szabo, Tamas; Urbanyi, BelaIn this study, Northern Pike larvae's digestive tract contents were examined inhabiting in Isaszeg reservoir lake, Hungary. In totally 19 thousand varieties of nutrients were found out, 12 of them derived from zooplankton and 7 of them from phytoplankton. Northern Pike larvae's constitutive nutriment sources were zoological originated. Geometric Importance Index (GII) were highest for Bosmina sp. with 1097.49 in this specie's larval nutrition. This was followed by Chydorus sp. (503.836) and Thermocyclops sp. (493.299) respectively. Pike starts to exogenous feeding at 12 mm length. In contrast to GII, Selectivity index (SI) were revealed that Thermocyclops sp. were preferred by pike larvae as the main food organism.Öğe Prey selection by African catfish Clarias gariepinus (Burchell, 1822) larvae fed different feeding regimes(2006) Yılmaz, Erdal; Bozkurt, Ahmet; Gökçek, KayaMevcut çalışmada karabalık, Clarias gariepinus, larvalarının canlı yem seçimi laboratuar koşullarında incelenmiştir. Dış beslenmeye geçen larvalara 7 gün boyunca plankton, plankton + alabalık başlangıç yemi ve plankton + betain ilaveli alabalık başlangıç yemi verildi. Yemlemeden 15 dakika sonra her muameleden 5 larva mide içeriklerini ve seçicilik indekslerini tespit etmek için örneklendi. Kuru yemlerin larvaların canlı yem seçimlerini etkilememesine rağmen, büyümelerini önemli derecede iyileştirdiği gözlendi (P < 0,05). Tüm yemleme rejimlerinde de karabalık larvalarının diğer zooplankton türlerinden çok Kopepod ve Rotaria türlerini tercih ettiği belirlenmiştir.Öğe Prey selection by African catfish Clarias gariepinus(Burchell, 1822) larvae fed different feeding regimes(2006) Yilmaz, Erdal; Bozkurt, Ahmet; Gökçek, KayaLive prey selection by African catfish, Clarias gariepinus, larvae was examined under laboratory conditions. Larvae were offered plankton, plankton + trout starter (TS) and plankton + betaine supplemented trout diet (BTS) for 7 days after exogenous feeding. Five larvae were sampled to determine their gut contents and selectivity index for each treatment 15 min after the feeding. It was observed that dry diets (TS and BTS) improved the growth (P < 0.05), but did not significantly influence the prey selection of the larvae. It was determined that African catfish larvae preferred Copepods and Rotaria sp. to other zooplankton species for all feeding regimes. © TÜBİTAK.Öğe Seasonal variations in body length and fecundity of 2 copepod species : Thermocyclops crassus (Fischer, 1853) and Eudiaptomus drieschi (Poppe & Mrázek, 1895)(2014) Bozkurt, Ahmet; Can, Mehmet FatihThe effects of temperature, dissolved oxygen, nitrate, phosphate, and chlorophyll-a concentration on the body length and egg production of a cyclopoid copepod, Thermocyclops crassus, and a calanoid, Eudiaptomus drieschi, were evaluated. Sampling was conducted in Yenişehir Lake (Hatay, Turkey) on a monthly basis between May 2003 and April 2004. The results of the present study showed that, among the parameters considered, temperature and chlorophyll-a concentration were the main parameters influencing the body length of T. crassus and E. drieschi in Yenişehir Lake. For E. drieschi, egg production was also affected by chlorophyll-a levels.Öğe Seasonal variations in body length and fecundity of 2 copepod species: Thermocyclops crassus (Fischer, 1853) and Eudiaptomus drieschi (Poppe & Mrazek, 1895)(Tubitak Scientific & Technological Research Council Turkey, 2014) Bozkurt, Ahmet; Can, Mehmet FatihThe effects of temperature, dissolved oxygen, nitrate, phosphate, and chlorophyll-a concentration on the body length and egg production of a cyclopoid copepod, Thermocyclops crassus, and a calanoid, Eudiaptomus drieschi, were evaluated. Sampling was conducted in Yenisehir Lake (Hatay, Turkey) on a monthly basis between May 2003 and April 2004. The results of the present study showed that, among the parameters considered, temperature and chlorophyll-a concentration were the main parameters influencing the body length of T. crassus and E. drieschi in Yenisehir Lake. For E. drieschi, egg production was also affected by chlorophyll-a levels.Öğe SEASONAL VARIATIONS IN THE LENGTH OF ZOOPLANKTON RELATED TO CERTAIN PHYSICOCHEMICAL VARIABLES IN TWO FRESHWATER RESERVOIRS(Brill Academic Publishers, 2012) Bozkurt, Ahmet; Celik, Kemal; Sevindik, Tugba OngunSeasonal variations in the body length of zooplankton were studied in relation to water temperature, nitrate (NO3), soluble reactive phosphorus (SRP), total chlorophyll, Secchi disk depth, pH, conductivity, and oxidation-reduction potential (ORP) in a mesotrophic (Ikizcetepeler) and a eutrophic (Caygoren) reservoir from February 2007 to March 2008. During the study, the body lengths of a total of 7590 zooplankton specimens (1110 rotifers, 3270 cladocerans, and 3210 copepods) were measured. The length of the majority of the species was significantly smaller in summer than in winter, fall, and spring, including that of the most dominant species, Asplanchna priodonta, Daphnia galeata, Daphnia longispina, Diaphanosoma brachyurum, Bosmina longirostris, Leptodora kindtii, Ceriodaphnia pulchella, Cyclops vicious, Metacyclops gracilis, and Acanthocyclops robustus (F > 5, p < 0.05). Correspondence analysis (CA) showed that the body length of the zooplankton studied was inversely related to water temperature, whereas it was positively related to ORP and pH. The results of our study suggest that, although nutrients (NO3 and SRP) apparently have an effect on zooplankton body length only in the mesotrophic reservoir, temperature influences the body length in both the mesotrophic and the eutrophic reservoir.
