Temperature effects on the embryonic development of common octopus (Octopus vulgaris)

Presenting Author: Eduardo Almansa

Authors: Diana Reis [1], Lorenzo Márquez [2], Inmaculada Varó [3], Catalina Perales-Raya [4], Juan Carlos Sanz [4], Virginia Martín [4], Eduardo Almansa [4]

Affiliations:
1. Departamento de Biología Animal, Edafología y Geología. U niversidad de La Laguna, Spain;
2. Grupo de Modelización Digestiva. Universidad de Almería, Spain.
3. Instituto de Acuicultura Torre de la Sal, Consejo Superior de Investigaciones Científicas, Spain.
4. Instituto Español de Oceanografía, Centro Oceanográfico de Canarias, Spain

Temperature effects on the embryonic development of common octopus (Octopus vulgaris) The effect of temperature in embryonic development of Octopus vulgaris has been revised based on bibliography data. Higher temperatures implies higher energy requirements and higher yolk consumption which was linked to a decrease in embryos survival rate, an increment of premature paralarvae and smaller hatchlings with lower paralarval survival rates under starvation. Hard structures such as the beak were also affected. In addition, studies on different biomarkers showed the sensitivity of RNA/DNA, heat shock protein (HSP70) and glutathione S – transferase GST to temperature raise with an increase on its content and activity during late embryonic and paralarvae stages. The raise on rearing temperature increase the consumption of total lipid content from embryos, nonetheless its fatty acid composition remained similar between different rearing temperatures. Regarding the length of embryonic development, warming shortened this period. When the rate of development (day – 1) in ectotherms is plotted against temperature (°C), an increasing linear pattern arise for a range of permissive temperatures and regression procedures allow to calculate a threshold temperature (Th) and a thermal constant (K, days – ºC) for the embryonic development. Previous studies, and a new experimental data reported in the present work, allow the calculation of Th and K for different populations of O. vulgaris. Plots for O. vulgaris coming from different geographical origins lead to Th ranging 7.3 – 12.6°C, and K ranging 370 – 455 d – °C”. Eggs from Canary Islands did not survive above 23°C, whereas eggs from Senegal can finish development above 25°C. The comparison of thermal parameters of different populations suggests geographical adaptations.

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