Margarida Hermida

Margarida Hermida
University of Bristol | UB · Department of Philosophy

PhD

About

57
Publications
8,358
Reads
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386
Citations
Citations since 2017
24 Research Items
260 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Education
April 2009 - November 2012
University of Porto
Field of study
  • Biology

Publications

Publications (57)
Article
Full-text available
Life on Earth descends from a common ancestor. However, it is likely that there are other instances of life in the universe. If so, each abiogenesis event will have given rise to an independently originated life clade (IOLC), of which Earth-life is an example. In this paper, I argue that the set of all IOLCs in the universe forms a Darwinian popula...
Article
Full-text available
Some plausibly necessary a posteriori theoretical claims include ‘water is H2O’, ‘gold is the element with atomic number 79’, and ‘cats are animals’. In this paper I challenge the necessity of the third claim. I argue that there are possible worlds in which cats exist, but are not animals. Under any of the species concepts currently accepted in bio...
Preprint
Full-text available
This paper addresses the question ‘what is an organism?’. Extant theories of organismality only provide a partial answer because they do not include an account of composition on which an ontology of living entities can be based. Here we develop a new account of what organisms are, based on a naturalistic answer to the special composition question,...
Article
Full-text available
Life is a self-maintaining process based on metabolism. Something is said to be alive when it exhibits organization and is actively involved in its own continued existence through carrying out metabolic processes. A life is a spatio-temporally restricted event, which continues while the life processes are occurring in a particular chunk of matter (...
Article
Full-text available
Small-scale recreational and artisanal fisheries are popular activities in the Autonomous Region of Madeira, and to date no information is available on their impact on regional coastal ecosystems. Through fishers’ surveys and official registers of fish landings, we described and characterized these fisheries in Madeira, comparing artisanal and recr...
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...
Article
The Atlantic chub mackerel Scomber colias and the Blue jack mackerel Trachurus picturatus are two abundant species in the Macaronesia region which include the archipelago of Madeira, Portugal. Both are key species in the trophic web, being important prey for several local top predators, such as seabirds and marine mammals. However, little is known...
Article
Tunas are among the most exploited top predators worldwide, with negative impacts on some of their stocks. Changes in their population abundance can impact marine food-webs and have the potential to alter entire ecosystems. To better understand the impacts of the exploitation of tuna stocks in the most critical habitats, basic knowledge on the diet...
Article
Full-text available
Myxozoan parasites of the genus Kudoa Meglitsch, 1947 are associated with post-mortem tissue degradation that causes great financial losses to commercial fisheries. Kudoa thyrsites (Gilchrist, 1924) is a species with a very wide host range including commercial tunas, mackerels, salmonids and flatfishes. A sample of 190 fishes of 18 species from the...
Article
Data obtained from licenses of spearfishers and surveys conducted in 2004 and 2017 allowed do the analysis, for the first time, of the practice of spearfishing in the Madeira archipelago. Only a small percentage of the population practices spearfishing, mostly local young men. Most of them practice the activity with a partner throughout most of the...
Article
Scabbardfishes are a group of deep-water fishes from the family Trichiuridae that form the basis of an important longline fishery in the Madeira archipelago, in the southern part of the Northeast Atlantic. Two closely related and morphologically similar species occur in this area: the black scabbardfish, Aphanopus carbo, and the intermediate scabba...
Article
Introduction A new species of the genus Caligus is described based on specimens collected from pompano, Trachinotus ovatus (Linnaeus), caught in eastern Atlantic waters, near the Madeira archipelago. Methods Pompano (n=21) were purchased from the local fsh market and examined for parasitic copepods. Morphological features of the copepods were exami...
Article
Full-text available
In 2017, a total of 4825 licences were issued for shore angling in Madeira. Surveys were conducted on 734 anglers, some in the government fisheries office during the licence request and others during the fishing activity. Shore angling is practised throughout the year, mostly at weekends and during day time, and with an increase in summer. More tha...
Article
A survey of fish and seafood consumption habits was carried out in Madeira archipelago, in the Eastern Atlantic. A total of 465 valid questionnaires were obtained from all municipalities of Madeira and Porto Santo islands. Cod, an imported product, but a traditional Portuguese staple food, was the most frequently consumed species, surpassing locall...
Poster
Full-text available
The common bottlenose dolphin (Tursiops truncatus) and the short-finned pilot whale (Globicephala macrorhynchus) occur year-round in the waters off the Madeira Archipelago, and present island-associated populations, yet no literature is found about their diet composition in this region. Bottlenose dolphins usually are opportunistic feeders inhabiti...
Article
Small pelagic fishes constitute a valuable food resource for human consumption and are also important components of marine food webs. At Madeira, a Portuguese archipelago in the eastern Atlantic, they are the target of a year-round purse-seine fishery operating mainly off the south coast of Madeira Island. Landings of this fishery are mostly compos...
Conference Paper
Full-text available
The blue jack mackerel, Trachurus picturatus (Osteichthyes, Carangidae) is considered as one of the most commercial fish in Mediterranean and Atlantic waters. On this work we aimed to study the occurence of monogenean parasite communities on this Carangidae species in the Mediterranean Sea and the Atlantic Ocean, in order to better understand the e...
Article
A sample of 128 skipjack tuna Katsuwonus pelamis from Madeira archipelago was the subject of a parasitological analysis, in order to identify seasonal patterns of parasite infection which can provide information regarding the migratory patterns of skipjack tuna in the Eastern Atlantic. A total of 24 parasite taxa were detected. The nematode Oncopho...
Article
Amberjacks, Seriola spp., are a group of carangid fishes of economic importance for fisheries and aquaculture worldwide. A survey of the parasites of greater amberjack S. dumerili and almaco jack or longfin yellowtail S. rivoliana from the Madeira archipelago (including the Madeira and Selvagens Islands) was carried out. This work is the first para...
Conference Paper
A sample of 128 skipjack tuna Katsuwonus pelamis from Madeira archipelago was the subject of a parasitological analysis, in order to identify seasonal patterns of parasite infection which can provide information regarding the migratory patterns of skipjack tuna in the Eastern Atlantic. A total of 24 parasite taxa were detected. The nematode Oncopho...
Article
Full-text available
Skipjack tuna, Katsuwonus pelamis, is a tropical species of economic importance for fisheries around the world. It occurs seasonally in subtropical waters around Madeira archipelago, in the warmer months. In this study, a parasitological analysis was carried out on a sample of 30 skipjack caught near Madeira Island. A total of 24 parasite taxa were...
Article
Full-text available
Tunas constitute an important seasonal fishery in the region of Madeira. Bigeye and skipjack are usually the most abundant species in the area, with albacore reaching record landings in 2014. This document updates the tuna statistics of Madeira archipelago between 1999 and 2015, including the total catch by species, the baitboat fleet composition a...
Article
This study offers a brief overview of the historical development of fisheries in Madeira since 1938. Changes in food web structure in the waters around Madeira archipelago were evaluated using the mean trophic level of landings (TLm) coupled with the Fishing-in-Balance (FiB) index for the period 1979–2014. These indices were also calculated for the...
Article
Blue jack mackerel, Trachurus picturatus, is a carangid fish which constitutes an important commercial resource in the north-east Atlantic. Its metazoan parasite community from Portuguese mainland waters was investigated here for the first time. Nine parasite taxa were found, most of which are common parasites of Trachurus spp. The parasite communi...
Article
Full-text available
A parasitological survey was carried out on a sample of sixty mutton snappers (Lutjanus analis) that were caught on the coast of Alagoas, northeastern Brazil. The parasite diversity and infection levels were low. The ectoparasite Rocinela signata Schioedte & Meinert, 1879 (Isopoda: Aegidae), and larvae of two endoparasites, Trypanorhyncha gen. sp....
Article
Full-text available
In this study the following parasites were selected as biological tags for the identification of blackspot seabream (Pagellus bogaraveo) stocks in the northeast Atlantic: Diphterostomum vividum (Digenea: Zoogonidae), Anisakis simplex s.l., A. physeteris, Anisakis sp. PB-2010 (Nematoda: Anisakidae), and Bolbosoma sp. (Acanthocephala: Polymorphidae)....
Article
A study was carried out on the gastrointestinal helminth communities of blackspot seabream, Pagellus bogaraveo, from the Portuguese mainland and island waters. Fifteen helminth parasite species were detected, including the following new records in this host: the digeneans Accacladocoelium petasiporum, Brachyenteron helicoleni, Glomericirrus macrour...
Article
Full-text available
The characterization of Prosorhynchus crucibulum (Rudolphi, 1819) Odhner, 1905 egg and miracidium is important in order to better understand the transmission dynamics between the definitive host and the primary host, the mussel. In this way, the objective of this work was to study the miracidia morphology, in order to evaluate if this species belon...
Article
Full-text available
A population of the gill parasite Hatschekia pagellibogneravei (Hesse, 1878) was studied on one of its sparid fish hosts, the blackspot seabream, Pagellus bogaraveo (Brünnich), off the coast of Madeira Island, Portugal, northeast Atlantic. Very high infection levels of this copepod were detected, with no significant seasonal differences. Abundance...
Article
Full-text available
The ectoparasite community of the blackspot seabream, Pagellus bogaraveo, was studied in different locations in Portuguese waters of the north-east Atlantic Ocean. This is the first study to focus on the ectoparasites of this commercially important sparid fish. Nine ectoparasite species were detected. Gnathia sp., Aega deshaysiana, A. antillensis,...
Article
The blackspot seabream, Pagellus bogaraveo, is a sparid fish of great economic importance in the northeast Atlantic. The main aim of this work was to assess the infection levels and diversity of anisakid nematodes parasitizing P. bogaraveo from Portuguese waters. The anisakid larvae were identified by polymerase chain reaction-restriction fragment...
Article
Full-text available
We studied the use of parasites as biological tags for discriminating, fish stocks of Aphanopus carbo (Osteichthyes: Trichiuridae) front Portugal (Sesimbra oil the mainland, Madeira and the Azores). Sixteen different metazoan parasites were found (14 from Madeira, 9 from Sesimbra and 7 from the Azores). Some parasites occurred only in fish from Mad...
Article
Full-text available
Aphanopus carbo, black scabbardfish, specimens from 3 Portuguese regions (the mainland, Madeira and the azores) during four (mainland and Madeira) or two (azores) seasons of the year were examined for the presence of Anisakis. all the fish examined (n=287) were infected with Anisakis L3 larvae (prevalence = 100%). significant geographical differenc...
Article
Full-text available
The primary aim of the present study was to conduct a 1-yr parasitological survey of a Mytilus galloprovincialis mussel population from the Aveiro Estuary, Portugal. In addition, we attempted to assess the host response to parasites by examining host histopathology, including an evaluation of hemocyte infiltration and parasite encapsulation. The pa...
Article
Gobio lozanoi, from the River Febros northern Portugal, contained female Philometra ovata in the body cavity causing abdominal swelling. A mild chronic inflammation and some tissue necrosis were observed in infected fish. Significant correlations were found between occurrence of infection and host length, and gonado-somatic index; and between inten...
Article
Full-text available
Over an 11-month period, the gills, digestive tract, and swimbladder of eels from the Ria de Aveiro were examined for the presence of parasites. Fifteen metazoan parasite species were found: one myxosporean (Myxidium giardi), one monogenean (Pseudodactylogyrus anguillae), five digeneans (Deropristis inflata, Lecithochirium rufoviride, Helicometra f...

Questions

Question (1)
Question
I'm trying to identify some Didymozoid trematodes and it would really help if I could access some of the original descriptions in Satyu Yamaguti (1970) 'Digenetic trematodes of Hawaiian fishes'; however I can't find it anywhere. Anyone know where I could find a copy? Thank you.

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Projects (4)
Project
Large marine predators are widely recognized as key elements in the marine environment, delivering invaluable regulation services and many providing substantial economic revenue. Hence, their rapid and widespread decline by excessive harvesting or other human impacts is a matter of high economic and social relevance, gathering serious concerns in the scientific and political arenas alike. Therefore significant resources have been devoted to build ancillary data to feed functional ecosystem models. These models are strongly based on the knowledge of relevant ecological processes and provide vital guidance to management for the sustainable and ecosystem-based exploitation of commercially significant taxa and/or the conservation of threatened species. However, in many areas such process-oriented approach is hampered by limited knowledge on such basic topics as diet, energy fluxes and distribution of predators and of their prey. This is also true for the deep-ocean regions surrounding the archipelago of Madeira, including the Selvagens. In this project we will undertake the first comprehensive and integrated attempt to unveil the structure and functioning of these offshore pelagic ecosystems. Our broad-scoped team aims at investigating and modelling the trophic links (and ecological derivatives) involving the marine megafauna occurring in this vast oceanic region. The taxonomic coverage of this project includes above- and underwater predators: pelagic seabirds (shearwaters and petrels), tunas, billfishes (targeted by commercial or big game fisheries), sea turtles and marine mammals. These charismatic taxa will be used to provide detailed data on the distribution and ecological significance of prey, mostly fish and squid but also crustaceans and jellyfish. The geographical scope of the project includes the huge ranges of well-studied breeding seabirds, notably Cory’s Shearwater (CS) which forages over an area over 1.5million km2. Data from other pelagic-foraging seabird species and from local tuna fisheries will likely extend this area to represent a vast fraction of the 4million km2 comprising the Portuguese EEZ. The location of major aggregations of seabird taxa in this region is still unknown. We will complement our extensive database on CS trips with new tracking data for most other pelagic seabird (Bulwer’s Petrel, Deserta Petrel, Little Shearwater, and White-Faced Storm Petrel), using bird-born GPS and geolocators. We will employ recent spatially-explicit techniques to produce predictive distributional models, using remote-sensed oceanographic variables. The diet of seabirds tracked with GPS as well as that of tunas and billfishes captured at known locations will be used to assess the distribution and ecological role of different forage taxa in these subtropical ecosystems. We plan to combine conventional methods with DNA-barcoding to describe diet of predators to high taxonomic detail, using stomach samples of live, stranded and harvested animals. Research on trophic ecology and feeding habits of predator and prey will be furthered by using mixing models and community metrics derived from stable isotopic analysis of predator and prey tissues. Our heterogeneous predator assemblage represents a powerful asset to sample marine prey over wide horizontal (inshore-offshore), and vertical (epi-vs mesopelagic) gradients, in distinct water masses and bathymetric landscapes. Evidence suggests that even remote oceanic environments are not safeguarded from pollution due to global water and air circulation of several pollutants, most showing bio-accumulation and trophic amplification, like potential toxic trace elements. Levels of biota contamination in this region are poorly documented, a situation in need of remedy given that some species are used for human consumption. Our multi-species study represents an ideal setup to document and interpret geographic patterns in trace elements (Hg and other contaminants) distribution, and to identify factors and processes contributing to enrichment in different taxa.