Thermal Tolerance Parameters of Three Species from the CichlidaeFamily at Two Acclimation Temperatures and Their Changes According to Body Size

Abstract

Thermal tolerance parameters of electric yellow cichlid (Labidochromis caeruleus), peacock cichlid (Aulonocara stuartgranti) and blue dolphin cichlid (Cyrtocara moorii) at 20 and 28 °C acclimation temperatures (AT) and their changes according to body size were determined in this study. Depending on AT, the critical low (CTmin) and high (CTmax) temperatures ranged from 9,40 to 12,79 °C and 35,40 to 39,87 °C, respectively. TTP (thermal tolerance polygon) value calculated as 208 - 220 °C shows that these species have a narrow temperature range (stenothermic). A positive relationship was observed between AT and CTM values (P < 0.05). Increasing the AT from 20 to 28 °C caused an increase in the CTmin values of the species between 2.56 and 3,39 °C, and in the CTmax values between 2,42 and 3,17 °C. Depending on this change, the ARR (acclimation response rate) values were found between 0,32 and 0,42 in CTmin and 0,30 and 0,40 in CTmax among species. A 7-8 fold weight difference in three cichlid species did not affect either low or high-temperature tolerance of fish at both AT (P > 0.05). Therefore, the argument that small-sized individuals of aquatic poikilotherms have an advantage in coping with high temperatures was not observed in these three species.

Keywords

• Labidochromis caeruleus
• Aulonocara stuartgranti
• Cyrtocara moorii
• thermal tolerance
• fish size

Cichlidae Ailesinden Üç Türün İki Alıştırma Sıcaklığında Termal Tolerans Parametreleri ve Bunların Vücut Büyüklüğüne Göre Değişimi

Abstract

Çalışmada Cihlidae ailesinden sarı prenses (Labidochromis caeruleus), şeker pembe (Aulonocara stuartgranti) ve yunus ciklit (Cyrtocara moorii)’in 20 ve 28 °C alıştırma sıcaklığında (AT) termal tolerans parametreleri ve bunların vücut büyüklüğüne göre değişimleri belirlenmiştir. Balık türleri arasında sıcaklık tolerans değerleri birbirine yakın olup, AT’ye bağlı olarak kritik düşük sıcaklık (CTmin) 9,40 – 12,79 °C, kritik yüksek sıcaklık (CTmax) 35,40 – 39,87 °C arasında saptanmıştır. Bu verilere göre 208 - 220 °C olarak hesaplanan TTP (thermal tolerance polygon) değeri, bu türlerin ait oldukları ailenin karekterine uygun olarak dar bir sıcaklık aralığına (stenothermik) sahip olduğunu göstermektedir. Üç ciklit türünde AT ile CTM değerleri arasında pozitif bir ilişki gözlenmiştir (P<0.05). AT’nin 20°C’den 28 °C’ye çıkması, balıkların CTmin değerlerinde 2,56 ile 3,39 °C, CTmax değerlerinde 2,42 ile 3,17 °C arasında bir artışa neden olmuştur. Bu değişime bağlı olarak ARR (alıştırma tepki oranı) değerleritürler arasında CTmin’de 0,32 ile 0,42, CTmax’da 0,30 ile 0,40 arasında bulunmuştur. Nispeten düşük sayılabilecek bu değerler, bu türlerin sıcaklık dalgalanmalarına karşı duyarlı olduğuna işaret etmektedir. Üç ciklit türünde 7-8 kat bir ağırlık farkınınher iki AT’de balıkların ne düşük ne de yüksek sıcaklık toleransı üzerinde herhangi bir etkisinin olmadığı belirlenmiştir (P > 0,05). Dolayısıyla, sucul poikiloterm hayvanların küçük boyutlu bireylerinin yüksek sıcaklıklarla baş etmede avantajlı olduklarına dair sav, bu üç ciklit türü üzerinde yapılan gözlemlerde doğrulanmamıştır

Keywords

• Labidochromis caeruleus
• Aulonocara stuartgranti
• Cyrtocara moorii
• termal tolerans
• balık büyüklüğü

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