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|Title: ||Patterns of distribution and abundance of the stalked barnacle (Pollicipes pollicipes) in the central and southwest coast of continental Portugal|
|Authors: ||Sousa, Alina|
Castro, João J.
|Keywords: ||stalked barnacles|
|Issue Date: ||Oct-2013|
|Abstract: ||The stalked barnacle Pollicipes pollicipes is a cirriped crustacean that lives on very exposed rocky shores. This
barnacle is the most important economical resource on intertidal rocky shores of continental Portugal. It is
highly prized as food and heavily exploited (professional and recreational fishery), but fishery data are scarce
and do not estimate the real pressure upon this resource.
Despite its socio-economic interest, specific regulations on this fishery are recent and different along the
Portuguese coast. Four regions with different regulation can be identified: the marine reserve “Reserva
Natural das Berlengas” (RNB) and the marine park “Parque Marinho Prof. Luiz Saldanha” (PMLS) (both in
central Portugal); the natural park located in SW Portugal (“Parque Natural do Sudoeste Alentejano e Costa
Vicentina”, PNSACV); and the rest of the coast.
The main objective of the present study was to study the spatial patterns of percentage cover, biomass, density
and size structure of P. pollicipes in areas with different exploitation regimes, including harvested areas
and no-take areas. Additionally, variability between mid shore and low shore barnacles was also analysed.
Seven areaswere sampled with a variable number of sites (a total of 24) randomly sampled in each area during 2011.
Photographs and image analysis (percentage cover) and destructive sampling (density, biomass and size)were used.
In general, percentage cover, biomass and density were higher in mid shore when compared to low shore,
namely in harvested areas. Low shore barnacles had a higher proportion of adults with moderate and high
commercial value, while juveniles were relatively more abundant at mid shore.
There were no consistent differences in the patterns of distribution and abundance of P. pollicipes among
areas subject to different exploitation regimes. The most different area was the harvested area by professional
fishers in RNB, where the highest biomass within the study was registered (mid shore, 7.7 kg·m−2).
Barnacles within this area presented a higher proportion of adults with commercial value, while recruits
and juveniles were relatively more abundant in other areas.
The hypothesis of a highest percentage cover, density and biomass in the low shore of no-take sites was not
|Appears in Collections:||BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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