Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast

A. Moreno, S. Lourenco, J. Pereira, M. B. Gaspar, H. N. Cabral, G. J. Pierce, A. M. P. Santos

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The exploitation of the common octopus Octopus vulgaris in Portugal increased 50% in the last 20 years, largely motivated by the depletion of many fish stocks. Recently, the biomass of this fishery resource sharply decreased in some areas causing serious concern among local fishermen and an effort is underway to advise on novel and sustainable management measures. In this context, the octopus pre-recruit aggregations along the Portuguese coast are identified using georeferenced fishery-independent data, from autumn and winter sampling between 1996 and 2008. The relationships between pre-recruit aggregations and several environmental variables are analyzed to characterize their essential habitats (EFH). Pre-recruits are distributed throughout the Portuguese coast aggregated in 8 distinct recruitment grounds located on the middle-shelf at 11-19 km from the coastline, which are characterized by average bottom depths of 65-110 m and are associated to major rivers and lagoon systems. Within each season pre-recruit abundance is much higher in the south region, while pre-recruit aggregations on the northwest coast showed high inter-annual and seasonal variation driven by environmental variability. The western zone adjacent to Ria Formosa lagoon (southern coast) was identified as the main recruitment ground for O. vulgaris along the Portuguese coast. This is supported by the higher abundance of pre-recruits and by the recurrence of their presence in this area over the years analyzed, both in autumn and winter. The effects of physical variables on pre-recruit abundance modelled with generalized additive models (GAM) showed important regional differences. Bottom salinity and river runoff are the environmental variables that have most impact on pre-recruit distribution and abundance on the west coast, regardless of any seasonal effects. On the other hand, temperature imposes distinct seasonal and regional limitations on pre-recruit distribution, both on the NW and S regions. Pre-recruit preferential habitat is characterized by bottom temperatures of 14 degrees C, salinity values around 36.0, low precipitation (average

Original languageEnglish
Pages (from-to)74-85
Number of pages12
JournalFisheries Research
Volume152
Early online date6 Sep 2013
DOIs
Publication statusPublished - Apr 2014
Event1st Triennial International Symposium of the Cephalopod-International-Advisory-Council (CIAC) - Florianopolis, Brazil
Duration: 29 Oct 20122 Nov 2012

Keywords

  • Octopus vulgaris
  • Pre-recruits
  • Recruitment grounds
  • Habitat
  • EFH
  • Portugal
  • Common Octopus
  • Mediterranean Sea
  • 1797 cephalopoda
  • Soft-sediment
  • Balearic Sea
  • Cuvier
  • Growth
  • Fishery
  • Shelf
  • Paralarvae

Cite this

Moreno, A., Lourenco, S., Pereira, J., Gaspar, M. B., Cabral, H. N., Pierce, G. J., & Santos, A. M. P. (2014). Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast. Fisheries Research, 152, 74-85. https://doi.org/10.1016/j.fishres.2013.08.005

Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast. / Moreno, A.; Lourenco, S.; Pereira, J.; Gaspar, M. B.; Cabral, H. N.; Pierce, G. J.; Santos, A. M. P.

In: Fisheries Research, Vol. 152, 04.2014, p. 74-85.

Research output: Contribution to journalArticle

Moreno, A, Lourenco, S, Pereira, J, Gaspar, MB, Cabral, HN, Pierce, GJ & Santos, AMP 2014, 'Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast' Fisheries Research, vol. 152, pp. 74-85. https://doi.org/10.1016/j.fishres.2013.08.005
Moreno A, Lourenco S, Pereira J, Gaspar MB, Cabral HN, Pierce GJ et al. Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast. Fisheries Research. 2014 Apr;152:74-85. https://doi.org/10.1016/j.fishres.2013.08.005
Moreno, A. ; Lourenco, S. ; Pereira, J. ; Gaspar, M. B. ; Cabral, H. N. ; Pierce, G. J. ; Santos, A. M. P. / Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast. In: Fisheries Research. 2014 ; Vol. 152. pp. 74-85.
@article{21d19b44002643b29f9d3b5353d8c571,
title = "Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast",
abstract = "The exploitation of the common octopus Octopus vulgaris in Portugal increased 50{\%} in the last 20 years, largely motivated by the depletion of many fish stocks. Recently, the biomass of this fishery resource sharply decreased in some areas causing serious concern among local fishermen and an effort is underway to advise on novel and sustainable management measures. In this context, the octopus pre-recruit aggregations along the Portuguese coast are identified using georeferenced fishery-independent data, from autumn and winter sampling between 1996 and 2008. The relationships between pre-recruit aggregations and several environmental variables are analyzed to characterize their essential habitats (EFH). Pre-recruits are distributed throughout the Portuguese coast aggregated in 8 distinct recruitment grounds located on the middle-shelf at 11-19 km from the coastline, which are characterized by average bottom depths of 65-110 m and are associated to major rivers and lagoon systems. Within each season pre-recruit abundance is much higher in the south region, while pre-recruit aggregations on the northwest coast showed high inter-annual and seasonal variation driven by environmental variability. The western zone adjacent to Ria Formosa lagoon (southern coast) was identified as the main recruitment ground for O. vulgaris along the Portuguese coast. This is supported by the higher abundance of pre-recruits and by the recurrence of their presence in this area over the years analyzed, both in autumn and winter. The effects of physical variables on pre-recruit abundance modelled with generalized additive models (GAM) showed important regional differences. Bottom salinity and river runoff are the environmental variables that have most impact on pre-recruit distribution and abundance on the west coast, regardless of any seasonal effects. On the other hand, temperature imposes distinct seasonal and regional limitations on pre-recruit distribution, both on the NW and S regions. Pre-recruit preferential habitat is characterized by bottom temperatures of 14 degrees C, salinity values around 36.0, low precipitation (average",
keywords = "Octopus vulgaris, Pre-recruits, Recruitment grounds, Habitat, EFH, Portugal, Common Octopus, Mediterranean Sea, 1797 cephalopoda, Soft-sediment, Balearic Sea, Cuvier, Growth, Fishery, Shelf, Paralarvae",
author = "A. Moreno and S. Lourenco and J. Pereira and Gaspar, {M. B.} and Cabral, {H. N.} and Pierce, {G. J.} and Santos, {A. M. P.}",
year = "2014",
month = "4",
doi = "10.1016/j.fishres.2013.08.005",
language = "English",
volume = "152",
pages = "74--85",
journal = "Fisheries Research",
issn = "0165-7836",
publisher = "Elsevier Science B. V.",

}

TY - JOUR

T1 - Essential habitats for pre-recruit Octopus vulgaris along the Portuguese coast

AU - Moreno, A.

AU - Lourenco, S.

AU - Pereira, J.

AU - Gaspar, M. B.

AU - Cabral, H. N.

AU - Pierce, G. J.

AU - Santos, A. M. P.

PY - 2014/4

Y1 - 2014/4

N2 - The exploitation of the common octopus Octopus vulgaris in Portugal increased 50% in the last 20 years, largely motivated by the depletion of many fish stocks. Recently, the biomass of this fishery resource sharply decreased in some areas causing serious concern among local fishermen and an effort is underway to advise on novel and sustainable management measures. In this context, the octopus pre-recruit aggregations along the Portuguese coast are identified using georeferenced fishery-independent data, from autumn and winter sampling between 1996 and 2008. The relationships between pre-recruit aggregations and several environmental variables are analyzed to characterize their essential habitats (EFH). Pre-recruits are distributed throughout the Portuguese coast aggregated in 8 distinct recruitment grounds located on the middle-shelf at 11-19 km from the coastline, which are characterized by average bottom depths of 65-110 m and are associated to major rivers and lagoon systems. Within each season pre-recruit abundance is much higher in the south region, while pre-recruit aggregations on the northwest coast showed high inter-annual and seasonal variation driven by environmental variability. The western zone adjacent to Ria Formosa lagoon (southern coast) was identified as the main recruitment ground for O. vulgaris along the Portuguese coast. This is supported by the higher abundance of pre-recruits and by the recurrence of their presence in this area over the years analyzed, both in autumn and winter. The effects of physical variables on pre-recruit abundance modelled with generalized additive models (GAM) showed important regional differences. Bottom salinity and river runoff are the environmental variables that have most impact on pre-recruit distribution and abundance on the west coast, regardless of any seasonal effects. On the other hand, temperature imposes distinct seasonal and regional limitations on pre-recruit distribution, both on the NW and S regions. Pre-recruit preferential habitat is characterized by bottom temperatures of 14 degrees C, salinity values around 36.0, low precipitation (average

AB - The exploitation of the common octopus Octopus vulgaris in Portugal increased 50% in the last 20 years, largely motivated by the depletion of many fish stocks. Recently, the biomass of this fishery resource sharply decreased in some areas causing serious concern among local fishermen and an effort is underway to advise on novel and sustainable management measures. In this context, the octopus pre-recruit aggregations along the Portuguese coast are identified using georeferenced fishery-independent data, from autumn and winter sampling between 1996 and 2008. The relationships between pre-recruit aggregations and several environmental variables are analyzed to characterize their essential habitats (EFH). Pre-recruits are distributed throughout the Portuguese coast aggregated in 8 distinct recruitment grounds located on the middle-shelf at 11-19 km from the coastline, which are characterized by average bottom depths of 65-110 m and are associated to major rivers and lagoon systems. Within each season pre-recruit abundance is much higher in the south region, while pre-recruit aggregations on the northwest coast showed high inter-annual and seasonal variation driven by environmental variability. The western zone adjacent to Ria Formosa lagoon (southern coast) was identified as the main recruitment ground for O. vulgaris along the Portuguese coast. This is supported by the higher abundance of pre-recruits and by the recurrence of their presence in this area over the years analyzed, both in autumn and winter. The effects of physical variables on pre-recruit abundance modelled with generalized additive models (GAM) showed important regional differences. Bottom salinity and river runoff are the environmental variables that have most impact on pre-recruit distribution and abundance on the west coast, regardless of any seasonal effects. On the other hand, temperature imposes distinct seasonal and regional limitations on pre-recruit distribution, both on the NW and S regions. Pre-recruit preferential habitat is characterized by bottom temperatures of 14 degrees C, salinity values around 36.0, low precipitation (average

KW - Octopus vulgaris

KW - Pre-recruits

KW - Recruitment grounds

KW - Habitat

KW - EFH

KW - Portugal

KW - Common Octopus

KW - Mediterranean Sea

KW - 1797 cephalopoda

KW - Soft-sediment

KW - Balearic Sea

KW - Cuvier

KW - Growth

KW - Fishery

KW - Shelf

KW - Paralarvae

U2 - 10.1016/j.fishres.2013.08.005

DO - 10.1016/j.fishres.2013.08.005

M3 - Article

VL - 152

SP - 74

EP - 85

JO - Fisheries Research

JF - Fisheries Research

SN - 0165-7836

ER -