Dwellers in dens on sandy bottoms: Ecological and behavioural traits of Octopus vulgaris


  • Ángel Guerra Instituto de Investigaciones Marinas, CSIC
  • Jorge Hernández-Urcera Instituto de Investigaciones Marinas, CSIC
  • Manuel E. Garci Instituto de Investigaciones Marinas, CSIC
  • Marta Sestelo Departament de Matemàtiques, Universitat Autònoma de Barcelona
  • Marcos Regueira Instituto de Investigaciones Marinas, CSIC
  • Ángel F. González Instituto de Investigaciones Marinas, CSIC
  • Miguel Cabanellas-Reboredo Instituto Mediterráneo de Estudios Avanzados (IMEDEA, CSIC-UIB)
  • Matías Calvo-Manazza Instituto Mediterráneo de Estudios Avanzados (IMEDEA, CSIC-UIB)
  • Beatriz Morales-Nin Instituto Mediterráneo de Estudios Avanzados (IMEDEA, CSIC-UIB)




den ecology, visual census, habitat selection, drilling behaviour, Octopus vulgaris, National Park of the Atlantic Galician Islands (NW Spain)


Four visual censuses targeting Octopus vulgaris living in dens on sandy bottoms were carried out from June to October 2013 in the National Park of the Atlantic Galician Islands (NW Spain). Censuses were undertaken by scuba diving between 5 and 21 m depth in daytime. The total area swept was 13.75 ha. There were no significant differences between octopus presence in dens during open and closed fishing seasons. Depth had a significant negative relationship with occupancy. The average number of dens per 1000 m2 was 3.84±0.84 in June and 3.89 in October. The area per den was 260 m2. Den number estimations varied between 1586 and 2057. The largest number of dens (76.5%) was found between 5 and 10 m depth. Den distribution was clumped. No significant differences were found between octopus size classes (small, medium and large) and den diameter. Associate dens were observed. There were no significant differences in den diameter and shell types found around the middens. Many dens could be “permanent”. Drilling bivalve shell behaviour is discussed. The surveyed area had around 1100 individuals, mainly small specimens. No significant differences were found between octopus size and depth. Substrate, den type and food abundance and availability (especially razors Ensis arcuatus) seem to be the main factors influencing dens and octopus density and distribution. Den availability does not appear to be a limiting factor in this case. Temperature, den availability, predators and fishing pressure influencing density and distribution are discussed. Rodas inlet may be a preferential habitat for O. vulgaris individuals ranging from 200 to 2000 g, but especially small specimens ( ≤ 1000 g).


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How to Cite

Guerra Ángel, Hernández-Urcera J, Garci ME, Sestelo M, Regueira M, González Ángel F, Cabanellas-Reboredo M, Calvo-Manazza M, Morales-Nin B. Dwellers in dens on sandy bottoms: Ecological and behavioural traits of Octopus vulgaris. Sci. mar. [Internet]. 2014Sep.30 [cited 2024May26];78(3):405-14. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1545




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