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

Moreno, Ana; Lourenço, Sílvia; Pereira, João; Gaspar, Miguel B.; Cabral, Henrique N.; Pierce, Graham J.; Santos, A. Miguel P.

doi:10.1016/j.fishres.2013.08.005

Cited by 34 publications

(27 citation statements)

References 27 publications

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“…The Rodas inlet is greatly influenced by a seasonal upwelling and is therefore a highly productive marine realm (Álvarez-Salgado et al 2002). Species such as O. vulgaris may take advantage of these productive ecosystems by living there, as has occurred in other areas of the NW Atlantic Ocean (Moreno et al 2014). Sea bottom temperature (SBT) and sea bottom salinity (SBS) were the main environmental variables limiting pre-recruit or sub-adult aggregation in the eastern Mediterranean (Katsanevakis and Verriopoulos 2004a), the Mediterranean Sea and the eastern Atlantic (Hermosilla et al 2011) as well as in Portuguese waters (Moreno et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Species such as O. vulgaris may take advantage of these productive ecosystems by living there, as has occurred in other areas of the NW Atlantic Ocean (Moreno et al 2014). Sea bottom temperature (SBT) and sea bottom salinity (SBS) were the main environmental variables limiting pre-recruit or sub-adult aggregation in the eastern Mediterranean (Katsanevakis and Verriopoulos 2004a), the Mediterranean Sea and the eastern Atlantic (Hermosilla et al 2011) as well as in Portuguese waters (Moreno et al 2014). O. vulgaris is most often found in water with a SBT warmer than 10°C and cooler than 30°C and a salinity ranging from 32 to 40 (Mangold 1983).…”

Section: Discussionmentioning

confidence: 99%

“…Some of these ecological and behavioural aspects of O. vulgaris were considered in the central-east Atlantic and the Mediterranean Sea from fishery databases and fishing surveys (Guerra 1981, Sánchez and Obarti 1993, Quetglas et al 1998, Belcari et al 2002, Tsangridis et al 2002, and Moreno et al (2014) found the essential habitats for pre-recruitment along the Portuguese coast. However, there are many features that cannot be investigated through fishing surveys requiring direct observations in the field (Mather 1991, Hanlon et al 2008, Katsanevakis and Verriopolus 2004b.…”

Section: Introductionmentioning

confidence: 99%

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Dwellers in dens on sandy bottoms: Ecological and behavioural traits of <em>Octopus vulgaris</em>

et al. 2014

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Summary: Four visual censuses targetingOctopus 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 m 2 was 3.84±0.84 in June and 3.89 in October. The area per den was 260 m 2 . 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).Keywords: den ecology; visual census; habitat selection; drilling behaviour; Octopus vulgaris; National Park of the Atlantic Galician Islands (NW Spain). Moradores de guaridas de fondos arenosos: rasgos ecológicos y de comportamiento de Octopus vulgarisResumen: Entre junio y octubre de 2013 se realizaron cuatro censos visuales enfocados a estudiar el pulpo común Octopus vulgaris que mora en guaridas en fondos arenosos. Los censos se realizaron en la ensenada de Rodas, ubicada en el archipiélago de Cíes dentro del Parque Nacional de las Islas Atlánticas de Galicia (NO España). Dichos censos se efectuaron con buceo autónomo entre 5 y 21 m de profundidad y durante el día. El área total barrida fue de 13.75 ha. No se encontraron diferencias significativas entre la presencia de pulpos en las guaridas durante la temporada de veda y la de pesca. La profundidad tuvo una significación negativa en relación con el grado de ocupación. El promedio de guaridas por cada 1000 m 2 fue de 3.84±0.84 en junio y 3.89 en octubre. El área por guarida fue de 260 m 2 . El número estimado de guaridas varió ente 1586 y 2057. El mayor número de madrigueras (76.5 %) se encontró entre 5 y 10 m de profundidad. La distribución de las guaridas era agregada. No se hallaron diferencias significativas entre el diámetro de los refugios y el tamaño de los pulpos. Tampoco hubo ...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dwellers in dens on sandy bottoms: Ecological and behavioural traits of <em>Octopus vulgaris</em>

et al. 2014

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“…O. vulgaris has a short life cycle of 12-18 months and reaches minimum landing weight at 9-10 months-old (Katsanevakis and Verriopoulos 2006b). Moreno et al (2014) found that in the southwestern coast of Portugal octopus pre-recruits aggregated in recruitment grounds close to the Tejo and Sado estuaries. O. vulgaris is stenohaline in all life stages and does not reside in estuaries, but the authors hypothesised that it may take advantage of the high productivity of estuarine systems by living in their vicinity .…”

Section: Discussionmentioning

confidence: 92%

Are Portuguese coastal fisheries affected by river drainage?

Gamito

Vinagre

Teixeira

et al. 2016

Aquat. Living Resour.

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-The Portuguese coast is particularly adequate for studies on the impact of climate change on fisheries, as it has faced an increase in both air and sea surface temperature and a decrease in intensity and frequency of rainfall. Ecological responses to climate change have already been observed in Portuguese waters, with consequences in fisheries. Regional climate models have predicted a further decrease in rainfall in Portugal by the end of the century, which will have a strong impact on the runoff into coastal areas. River drainage affects the physical, chemical and biological properties of coastal ecosystems, regulating habitat availability and favouring their productivity. The present study analysed the influence of river drainage on landings of coastal ports in the vicinity of four hydrologically distinct estuaries. Unlike previous results obtained for the Mediterranean, no significant relationships between river drainage and landings were found. Relationships between drainage and landings can be inconsistent among regions and dependent on how strongly a food web relies on nutrients and organic matter of river origin. In the Portuguese coast, an upwelling regime is of particular importance for the richness and diversity of the coastal ecosystem and for fisheries. The complexity of the coastal upwelling phenomenon together with a possible interaction of several other smaller scale factors acting on recruitment of commercial species may mask the effects of river drainage on landings. Nevertheless, as accentuated decreases in rainfall have been predicted for Portugal, the resulting reduction in river drainage may still strongly impact fisheries in the future.

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“…In fact, these limitations have been shown to benefit small-scale commercial fisheries in multiple use MPAs (Cooke and Cowx, 2004;Rocklin et al, 2011). Nevertheless, since O. vulgaris recruitment and year class strength are known to be strongly influenced by environmental factors, such as salinity and water temperature (Lourenç o et al, 2012;Moreno et al, 2014), we expect those factors to affect population abundance over long time frames. This hypothesis is also supported by the GLM results since the factor "season" was significant for catch.…”

Section: Individual Species Responsesmentioning

confidence: 99%