Impact of harvest by humans on mussel populations around Easter

Ferreira, Ana; Seixas, Sónia; Rijo, Andreia; Faria, Sara; Fialho, Vânia

doi:10.5894/rgci383

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…On the other hand, trampling affects mussels directly, by removing all or part of an individual through crushing and dislodgement, or by weakening attachment strength. Thus, it increases the risk of displacement through storms or waves, the susceptibility to predation and the vulnerability of young individuals to the border effect [54,55]. However, Smith and Murray [26] found a shift towards greater frequencies of smaller individuals as effect of trampling.…”

Section: Plos Onementioning

confidence: 99%

The role of urbanisation in affecting Mytilus galloprovincialis

et al. 2020

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Urbanisation is considered as one of the most critical and widespread threats to coastal marine ecosystems. The aim of this study was to compare the density, percentage cover, thickness of clumps, condition index and size-frequency distribution of Mytilus galloprovincialis between urban and non-urban shores, at nested spatial scales, in the Northern Portuguese coast. M. galloprovincialis was selected as model because it is economically and ecologically relevant. Moreover, the relationship between mussel size and the other variables (i.e. density, percentage cover, thickness and condition index) were investigated. Mussels on urban shores showed a smaller density and a greater frequency of larger individuals. A significant negative correlation between mussel length with density and with thickness of clumps was also found. Our results seem to indicate that recruitment has declined on urban shores and, as a result, intraspecific competition is also smaller, leading to more resources being available for a fewer individuals which can reach larger sizes. As mussel beds support a great biodiversity of invertebrates and provide many ecosystem services, urbanisation may have indirect effects on communities associated with mussels. Understanding the vulnerability of mussel beds to urbanisation could inform management.

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Section: Plos Onementioning

confidence: 99%

The role of urbanisation in affecting Mytilus galloprovincialis

et al. 2020

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“…Note that the work of Rangel and Erzini (2007) covers a small part of Center region (until Aveiro), in addition of the North of the mainland. or particular species (e.g., purple sea urchin, Paracentrotus lividus; limpet, Patella candei; M. galloprovincialis) (Castro 2004, Ferreira et al 2013, spring and winter (or specific time periods such as Easter) can also be important for this recreational activity. This can be related with seasonal abundances, traditional harvesting periods (such as religious holidays), or with the reproduction period of the resource (Castro 2004;Ferreira et al 2013;.…”

Section: Effort Patternsmentioning

confidence: 99%

Marine Recreational Fishing in Portugal: Current Knowledge, Challenges, and Future Perspectives

Diogo

Veiga

Pita

et al. 2020

Reviews in Fisheries Science & Aquaculture

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Marine recreational fishing (MRF) in Portugal is a traditional leisure activity with considerable importance for coastal populations. In the absence of available information from the national data collection framework, this article aims to review the existing information on MRF across the country. MRF was an open access fishery until recently, but with rising evidence of overexploitation of coastal resources, a precautionary approach was imposed topdown, without consulting recreational fishers. In Portugal, the MRF participation rate is comparable to the European average (2%). The most important fishing mode (according to the official issued licenses) is shore angling. Mainland Portugal marine recreational catches (0.8% of total commercial landings) are likely underestimated, while the estimate for the Azores (6% of total commercial landings) is probably closer to the national reality. The Portuguese MRF sector faces several challenges, including: (1) the need for a definition of a national data collection framework; (2) the inclusion of MRF harvest estimates in stock assessments for key captured species; (3) management approaches which also take into account the ecosystem approach to fisheries and any potential effects of climate change; (4) additional research on post-release mortalities for the most important MRF species; and (5) a stronger involvement of all stakeholders in the decision-making process of MRF. The latter would be critical to improve the adequacy of regulations to the MRF reality, mitigate conflicts with other sectors (e.g., commercial fishing), and potentially increase fishers compliance.

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Impact of harvest by humans on mussel populations around Easter

Cited by 2 publications

References 10 publications

The role of urbanisation in affecting Mytilus galloprovincialis

The role of urbanisation in affecting Mytilus galloprovincialis

Marine Recreational Fishing in Portugal: Current Knowledge, Challenges, and Future Perspectives

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