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

  1. Ángel Guerra 1
  2. Jorge Hernández-Urcera 1
  3. Manuel E. Garci 1
  4. Marta Sestelo 2
  5. Marcos Regueira 1
  6. Ángel F. González 1
  7. Miguel Cabanellas-Reboredo 3
  8. Matías Calvo-Manazza 3
  9. Beatriz Morales-Nin 3
  1. 1 Instituto de Investigaciones Marinas, CSIC, Eduardo Cabello 6, 36208 Vigo, Spain
  2. 2 Departament de Matemàtiques, Universitat Autònoma de Barcelona, 08193 Bellaterra (Cerdanyola del Vallès), Spain
  3. 3 Instituto Mediterráneo de Estudios Avanzados (IMEDEA, CSIC-UIB), Departamento de Recursos Naturales, Esporles, Islas Baleares, Spain.
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Revista:
Scientia Marina

ISSN: 0214-8358

Ano de publicación: 2014

Volume: 78

Número: 3

Páxinas: 405-414

Tipo: Artigo

DOI: 10.3989/SCIMAR.04071.28F DIALNET GOOGLE SCHOLAR lock_openAcceso aberto editor

Outras publicacións en: Scientia Marina

Resumo

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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