Mafalda Freitas

Mafalda Freitas
Direçao Regional do Mar

Marine Biology and Fisheries and Master of Business Administration
Regional Director for the Sea (Madeira Government)

About

73
Publications
11,567
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Introduction
Mafalda Freitas is a marine biologist and since march 2020 assumed the Regional Directorate for the Sea (DRM) of Madeira Government. In the last 24 years worked on deep sea resources, participated in scientific fishing and ROV missions, research projects and international congresses, mostly related with deep sea resources, blue economy and ocean literacy. Good experience in project and team management. Responsible for several EU-Research Projects and PI in several research missio

Publications

Publications (73)
Poster
Full-text available
In the Madeira archipelago (NE Atlantic ocean), limpets have been harvested since the early days of colonisation, dating back to the early 15 th century. Due to the continuous long-term exploitation, the reproductive dynamics of Patella ordinaria in the Madeira archipelago is thought to have changed. The knowledge of potential fecundity is useful w...
Article
Full-text available
Background The blue marlin ( Makaira nigricans ) is a vulnerable migratory fish inhabiting tropical and subtropical pelagic waters of the Atlantic, Pacific and Indian Oceans. The biology and spatial ecology of the species in the eastern North Atlantic is poorly understood, despite being exploited in the region by recreational and commercial fisheri...
Article
Full-text available
Length-weight relationships (LWRs) are pivotal for comparative life-history studies, conservation strategies and ecosystem modelling among regions. They provide essential information on the growth, fitness and wellbeing of a population in an ecosystem. Length and weight relationships and descriptive statistics for eight Chondrichthyes, caught off t...
Article
Full-text available
Current trends in the global climate facilitate the displacement of numerous marine species from their native distribution ranges to higher latitudes when facing warming conditions. In this work, we analyzed occurrences of a circumtropical reef fish, the spotfin burrfish, Chilomycterus reticulatus (Linnaeus, 1958), in the Madeira Archipelago (NE At...
Article
Full-text available
Background Seamounts are underwater mountains which typically rise rather steeply at least several hundred meters above the deep-sea floor. These geological features interrupt water flow and hence may induce changes in the circulation of different water masses, in turn causing different physical and biological effects. For this reason, seamounts ar...
Article
Full-text available
This work is the result of an international research effort to determine the main impacts of the COVID-19 pandemic on marine recreational fishing. Changes were assessed on (1) access to fishing, derived from lockdowns and other mobility restrictions; (2) ecosystems, because of alterations in fishing intensity and human presence; (3) the blue econom...
Article
Aims Rising sea-level following the Last Glacial Maximum lead to fragmentation of coastal limpet populations between islands of the Archipelago of Madeira. This fragmentation is reinforced by recent heavy exploitation reducing effective population size on Madeira Island. We use the limpet P. aspera to understand how the role of processes at differe...
Article
Full-text available
The archipelago of Madeira (Portugal) is one of the main European big game fishing locations , where the main target species is the blue marlin (Makaira nigricans). Catch data for these fish were used to analyze their presence over the years, estimate their average weights, and calculate annual fishing success rates. The results showed a marked sea...
Preprint
Rising sea-level following the Last Glacial Maximum lead to fragmentation of coastal limpet populations between islands of the Archipelago of Madeira. This fragmentation is reinforced by recent heavy exploitation reducing effective population size on Madeira Island. We use the limpet P. aspera to understand how the role of processes at different ti...
Article
Full-text available
Studies on microbial communities are pivotal to understand the role and the evolutionary paths of the host and their associated microorganisms in the ecosystems. Meta-genomics techniques have proven to be one of the most effective tools in the identification of endosymbiotic communities of host species. The microbiome of the highly exploited topshe...
Article
Full-text available
Jellyfish are important components of the marine ecosystem and present a potential resource for different economic domains (e.g. medicine, food, biotechnology). We present an overview of the current state of jellyfish biodiversity in the Macaronesia region, which include the archipelagos of the Azores, Madeira, the Canary Islands and Cape Verde, an...
Article
Full-text available
According to the most recent taxonomical revision, the deep-sea dogfish genus Deania encompasses four species. Three of them, D. calcea, D. profundorum, and D. hystricosa, occur in the North Atlantic. Whilst D. profundorum can be identified by the presence of a subcaudal keel, the other two species are not easily visually distinguished. Uncertainti...
Article
In this study, we conducted an experimental panel survey in Norway, Germany and Portugal to explore consumers' willingness to pay more for products that are certified microplastic free. This is placed within the context of private certification schemes and private governance as mechanisms to increase consumer conscientiousness, establish a higher e...
Poster
Full-text available
Jellyfish are common components of the marine ecosystem with an important role within the trophic web. Under climate changes and human activities, jellyfish communities would change their structures, spatial and/or temporal distribution and species composition. These would lead to implications in the marine trophic webs, the populations of apex pre...
Article
Topshells play a pivotal role in intertidal rocky ecosystems and are adapted to harsh thermal and hydric stress. Phorcus sauciatus , a common grazer in the Macaronesian region (Madeira and the Canaries), has rarely been studied due to its restricted geographic distribution compared with Phorcus lineatus . Monthly samples were taken throughout 2017...
Article
Harvesting of intertidal grazers such as topshells is known to affect negatively the exploited populations by altering population structure and decreasing abundance. Phorcus sauciatus has a wide geographic distribution in the Northeastern Atlantic Ocean and is subject to increasing levels of harvesting pressure due to the expansion of human populat...
Chapter
Full-text available
The harvesting of littoral benthic shellfish in the archipelago of Madeira dates back to the fifteenth century when the Portuguese discovered and colonized the archipelago. The consumption of littoral shellfish is part of the gastronomic cultural heritage of this region, appreciated by the local population and tourists, and has a high social and ec...
Poster
Full-text available
The smooth hammerhead shark, Sphyrna zygaena, is a circumtropical species found worldwide in coastal, pelagic, and semi oceanic waters off and on continental shelves of the Atlantic, Indian Oceans, and Pacific Oceans. The IUCN lists the smooth hammerhead as Vulnerable globally but there is a lack of regional information on smooth hammerhead life h...
Article
Full-text available
The deep-sea sharks associated as by-catch of the Madeiran midwater drifting longline fishery for scabbardfishes (Aphanopus spp.) were investigated by means of an experimental survey at 800-1200 m depth within the Canary Islands Exclusive Economic Zone, whose fishing grounds have been exploited during the past 15 years. Nine species of chondrichthy...
Conference Paper
Full-text available
Marine Protected Areas (MPAs) are increasingly used as a tool to preserve biodiversity, manage fishing effort and facilitate recovery of degraded ecosystems. The island of Porto Santo is the second largest of Madeira’s archipelago (MA). Two MPAs were created in this island in 2008: a no-take area (Integral - Ilhéu de Cima), where all methods of fis...
Conference Paper
Full-text available
Seamounts are undersea mountains rising relatively steeply at least several hundred meters from the surrounding deep sea floor, but do not reach the surface. The Seine and Unicorn Seamounts belong to the Madeira-Tore seamount chain located between the Portuguese mainland and Madeira Island (NE Atlantic). A collection of Chondrichthyes from the Sei...
Article
As part of an annotated checklist of fishes of the archipelago of Madeira, a list with all cartilaginous fishes recorded from the archipelago is presented. The list contains 67 species of sharks, rays and chimaeras, whose presence in the area the authors consider confirmed. Another 14 species previously referred for the area are now considered dubi...
Article
Full-text available
Fish communities off the seamounts inside the Madeira exclusive economic zone are scarcely known, hence the need to improve this knowledge. A bottom trawl fishing survey targeting orange roughy, Hoplostethus atlanticus Collett, 1889, was carried out on the Lion, Susan, and Unicorn seamounts in the autumn of 2001. The aim of this paper is to give an...
Article
Full-text available
This study reports new findings of Chimaera opalescens Luchetti, Iglésias et Sellos, 2011, which represent new records of this fish from Madeira and Morocco. The specimens were caught at the depths between 800 and 1221 m. Additional specimens deposited in the Natural History Museum of Funchal (MMF) were also studied as a comparative material and th...
Article
Natural history collections from museums and private institutions can play an important role supporting decisions in biodiversity conservation. Seahorse populations have suffered a worldwide decline, while many areas remain data deficient including areas subjected to heavy commercial trading, such as the coasts of West Africa. In this work, seahors...
Article
The structure and composition of deep-sea fish assemblages living on the middle slope off NW Africa (26º–33º N) were investigated. Data were collected by six commercial trawlers during experimental fishing (1027 hauls) at depths between 800 and 1515 m. A total of 1115727 fish specimens, belonging to 37 families and 96 species (24 Elasmobranchii, 5...
Technical Report
Full-text available
BIOMETORE- “Biodiversity in the seamounts: the Madeira-Tore and Great Meteor” é um projeto financiado pela EEA Grants, tem como promotor o Instituto Português do Mar e da Atmosfera (IPMA) e inúmeros parceiros, entre os quais o Departamento de Oceanografia e Pescas da Universidade dos Açores (DOP/UAç), o Instituto do Mar (IMAR) e o Centro de Ciência...
Thesis
Full-text available
In recent years, there has been a growing concern for the sustainable management of the oceans, showing a wide range of international and European legal instruments and political documents that recommend the creation of Marine Protected Areas - MPAs. The MPAs are important in the sustainable management of oceans and integrated management of coastal...
Article
Gonad maturity scales morphological- and histologically characterized for 1st time. Spermatophores are viable in the spermathecae and used during the intermoult period. Very low moulting frequency with intermoult periods exceeding three years. Gonad maturation and release of larvae asynchronous throughout the spawning season. Minimum landing size a...
Article
Gonad maturity scales morphological- and histologically characterized for 1st time.•Spermatophores are viable in the spermathecae and used during the intermoult period.•Very low moulting frequency with intermoult periods exceeding three years.•Gonad maturation and release of larvae asynchronous throughout the spawning season.•Minimum landing size a...
Conference Paper
Full-text available
Non-indigenous species (NIS) invasions occur in aquatic and terrestrial ecosystems on a global scale and can create major ecological, evolutionary, economic and social pressures. In the last decade, lists of non-indigenous species have been produced for several European countries. To the best of our knowledge there are only three NIS inventories fo...
Conference Paper
Full-text available
In the framework of five major research projects carried out in waters off the Azores, Madeira, Canary and Cape Verde Islands –the Macaronesian archipelagos–, field work was done to prospect the deep-sea biodiversity and to search for new species of potential commercial interest between 250 and 2500 m. On board of several research and fishing vesse...
Article
Commercial fishery landings of the black scabbardfish, Aphanopus carbo, from the Madeira mid‐water drifting longline fleet (northeastern Atlantic) were studied for 2 years within a Portuguese government programme for fishing management. The process noted that 20% of the total catch corresponded to the intermediate scabbardfish, Aphanopus intermediu...
Article
Full-text available
The smalleyed rabbitfish, Hydrolagus affinis (de Brito Capello, 1868) (Chimaeridae), is recorded from the archipelago of Madeira for the first time, based on seven specimens caught between 1200 and 2500 m depth. This record extends the previously known range of distribution of this species, and also confirms its vertical distribution down to 2500 m...
Article
Full-text available
In the present paper the authors give an account on a didactic activity never done before in Madeira, aiming to unveil the main aspects of the deep Atlantic Ocean, including research done in Madeira and the main threats to this particular ecosystem. This activity was presented as a multimedia exhibition that was shown at all the municipalities of t...
Article
Full-text available
The slopes of Madeira and Seine and Unicorn Seamounts were surveyed between 1000 and 2500 m of depth with bottom long-lines and baited fish traps, during RECPROFMAD Cruise in October, 2004. The main object of this cruise was to identify new potential commercial species of fish and crustaceans and as a result of this pioneering effort, four new chon...
Article
Full-text available
In January 1990, the tanker "Aragon" oil spill reached Porto Santo Island (Madeira Archipelago). One year later, in 1991 the littoral fish fauna was evaluated. Ten years after the "Aragon" oil spill, a new survey was made using the same methods, to compare data. From the results it seems that the effecys of the oil were rather small. As a result of...
Article
Fish assemblages in Cais do Carvão Bay, Madeira Island, a proposed marine protected area (MPA), were determined from a diver visual census. A total of 32 transect counts were performed. Habitats sampled included sandy bottom, rocky boulders, vertical walls and rocky outcrops. Species richness, diversity, density, trophic structure, size and spatial...
Article
Full-text available
Fish assemblages in Cais do Carva ̃o Bay, Madeira Island, a proposed marine protected area (MPA), were determined from a diver visual census. A total of 32 transect counts were per- formed. Habitats sampled included sandy bottom, rocky boulders, vertical walls and rocky outcrops. Species richness, diversity, density, trophic structure, size and spa...
Article
Full-text available
The crab Platypodiella picta (A. Milne-Edwards, 1869) is recorded for the first time from Madeira Island waters and represents the most northerly record for this species in the eastern Atlantic.
Article
Full-text available
The goldspot goby Gnatholepis thompsoni Jordan, 1904 is reported from Madeira for the first time. This finding extends the known area of distribution of this species and represents the northernmost record of G. thompsoni in the Eastern Atlantic Ocean. KEY WORDS: Pisces, Gobiidae, Gnatholepis thompsoni, new record, Madeira, NE Atlantic Ocean.

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