78 documents found, page 1 of 8
When sardines disappear: tracking common dolphin, delphinus delphis, distributi...
Brouder, Sarah; Marques, Tiago A.; Oliveira, Nuno; Monteiro, Pedro; Gonçalves, Jorge Manuel Santos; Marçalo, AnaThe common dolphin, Delphinus delphis, is the most abundant cetacean species along the western Iberian Peninsula and faces many anthropogenic threats, with bycatch being the most impactful. Its preferred prey, sardine (Sardina pilchardus), has shown fluctuating abundance over the past decade, potentially influencing dolphin distribution. This study provides the first insights into common dolphin distribution al...
Projected climate change and limited dispersal potential threaten the seahorse ...
Peiffer, Friederike; Assis, Jorge; Lima, André R. A.; Henriques, Sofia; Pardal, Miguel A.; Martinho, Filipe; Gonçalves, Jorge Manuel SantosClimate change is predicted to drive species redistribution, altering the composition of marine communities and affecting ecosystem functioning. There is increasing evidence that fish distributions follow a trend of poleward expansion, while realised niches often decrease in range size. This study aimed to assess the influence of oceanographic connectivity and intrinsic dispersal mechanisms on changes in suitab...
Reducing cetacean interactions with bottom set‐nets and purse seining using aco...
Marçalo, Ana; Carvalho, Flávia; Frade, Magda; Bentes, Luis; Monteiro, Pedro; Pontes, João; Ferreira Alexandre, Teresa Sofia; Oliveira, FredericoIn southern Iberia (NE Atlantic), cetacean bycatch is reported in several fisheries, whereas depredation by bottlenose dolphin (Tursiops truncatus) is commonly observed in bottom set-net fisheries. This study tested the effectiveness of acoustic deterrent devices in discouraging small cetaceans from approaching bottom set-nets and purse seine to reduce interactions. The acoustic deterrent devices used in the st...
Marine protected areas stage of establishment and level of protection are good ...
Horta e Costa, Barbara; de Benito Abelló, Carmela; Pike, Elizabeth; Turnbull, John; MacCarthy, Jessica; Harasta, Nikki; Fragkopoulou, ElizaDespite the importance of active management and strong protection in driving marine protected areas (MPA) performance, coverage area remains the sole indicator for global targets. To assess whether conservation quality lags behind quantity, we conducted a global meta-analysis of 123 MPAs. We show that MPAs’ Levels of Protection and Stages of Establishment are reliable proxies for MPAs’ ecological outcomes; henc...
On the accuracy of self-reported data for fishing effort estimates – a case stu...
Russo, Tommaso; Sales Henriques, Nuno; Erzini, Karim; Gonçalves, Jorge Manuel SantosThe quantification and the analysis of fishing activity is one the most important features in fisheries sciences and ocean management, and fishery-dependent data has always been the main source of information used to that end. Within the different types of fishery-dependent data, self-reported logbook data provides vast amounts of different information about fishing activities. Despite their enormous importance...
Engaging and legitimizing communities: co-designing a community-based marine pr...
Rangel, Mafalda; Horta e Costa, Barbara; Guimarães, Mª Helena; Ressurreição, Adriana; Monteiro, Pedro; Oliveira, Frederico; Bentes, LuisMarine Protected Areas are increasingly used as tools to preserve marine habitats and biodiversity worldwide. Nonetheless, creating MPAs in densely populated multi-use coastal areas comes with intrinsic conflict potential, since protection and economic development are not always hand-in-hand and local users might disagree with the designation of such conservation tools. The use of inclusive and transparent part...
Evaluation of MPA effects on small-scale fisheries: a long-term landings-based ...
Belackova, Adela; Bentes, Luis; Buhl-Mortensen, Lene; Horta e Costa, Barbara; Gonçalves, Jorge Manuel SantosSmall-scale commercial fisheries represent a significant economic activity that can be affected by coastal Marine Protected Areas (MPAs). Official fishery landings data can serve as an effective means of evaluating the effects of MPAs on fisheries and harvested species, as they are available over long periods and do not incur any costs. However, the use of long-term landings as a solid baseline for pre-MPA cond...
Seasonal variation in seabird abundance and bycatch at artisanal bottom-set net...
Pereira, Jorge M.; Ramos, Jaime A.; Almeida, Ana; Marçalo, Ana; Carvalho, Flávia; Fagundes, Isabel; Gonçalves, Jorge Manuel Santos; Frade, MagdaBycatch is a major cause of seabird mortality, yet most studies focus on industrial fisheries, with limited knowledge on artisanal fisheries. This study investigates the seasonal abundance of seabirds off the southern-eastern coast of mainland Portugal, their attendance at artisanal bottom-set net fisheries, and observed bycatch, using onboard observations and fishermen interviews. From March 2020 to November 2...
Mitigation measures to reduce seabird's interactions with bottom-set nets in so...
Frade, Magda; Carvalho, Flávia; Samel, Vighnesh Nilesh; Oliveira, Nuno; Andrade, Joana; Gonçalves, Jorge Manuel Santos; Marçalo, AnaBycatch poses a significant threat to seabird populations globally. On the southern coast of mainland Portugal, mitigation measures were tested to reduce seabird interactions with fishing vessels. Between 2021 and 2023, this study evaluated the effectiveness of a visual deterrent (a ’scarybird’ device), an acoustic deterrent (megaphone broadcasts), alongside modification in fisher’s behaviour discard management...
Insights into conservation success: analysing shore angling before implementing...
Jacinto, Gonçalo; Veiga, Pedro; Monteiro, Pedro; Erzini, Karim; Gonçalves, Jorge Manuel Santos; Horta e Costa, Barbara; Pontes, JoãoIn January 2024, the "Natural Marine Park of the Algarve Reef - Pedra do Valado" (NMPAR-PV; southern Portugal), a community-based Marine Protected Area (MPA) was formally classified, setting the scene for a new paradigm for co-creating Portuguese MPAs. While complying with the best practices for MPA establishment, this area also contributes to national and international conservation targets. Measuring the succe...