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Graham John Pierce

Graham John Pierce
Instituto de Investigaciones Marinas (CSIC) · Departamento de Ecologia y Recursos Marinos

PhD 1986, University of Aberdeen

About

484
Publications
168,917
Reads
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16,344
Citations
Introduction
Dear colleagues, If you would like a copy of a publication, it is quicker to e-mail me directly rather than put the request through Researchgate!
Additional affiliations
October 2012 - September 2015
University of Aveiro
Position
  • Visiting Chair in Marine Science
Description
  • Part-time visiting position
September 2007 - October 2010
Instituto Español de Oceanografia
Position
  • Marie Curie Chair

Publications

Publications (484)
Poster
Full-text available
Between the 16th and 20th century, small cetaceans (particularly dolphins) were killed in large numbers off the coasts of modern Europe and North Africa, due to perceived competition with fisheries. Here, dolphins were long considered as pests responsible for reduced fish catches and damage to fishing gear. Such conflict was particularly acute betw...
Article
The inshore commercial squids, Loligo vulgaris and L. forbesii, co-occur in the ecoregions of Celtic Seas and Greater North Sea but the spatio-temporal structure of their spawning ranges is poorly understood. To help solve the problem, data sets collected during the last 30 years by British, German, French, and Irish scientists, as well as observat...
Poster
Full-text available
The Patagonian longfin squid Doryteuthis gahi has an annual life cycle with two seasonal cohorts (autumn and spring spawners). Earlier studies on the Patagonian shelf found a predominance of Euphausiacea in the D. gahi diet, but no studies to date have investigated differences between feeding spectra of the two cohorts or decadal diet shifts. The p...
Article
Full-text available
The Patagonian longfin squid Doryteuthis gahi has an annual life cycle with two seasonal cohorts (autumn and spring spawners). Earlier studies on the Patagonian shelf found a predominance of Euphausiacea in the D. gahi diet, but no studies to date have investigated differences between feeding spectra of the two cohorts or decadal diet shifts. The p...
Technical Report
Several recent studies have suggested that the Iberian harbour porpoise is genetically and morphologically distinct and may represent a separate subspecies. The main threat facing this population is fishery bycatch. Recent data on porpoise bycatch are available from strandings and on-board observations. Generally, more bycaught porpoises are record...
Conference Paper
Recent review papers have addressed progress in stock assessment and forecasting for fished cephalopods but there remains a need to develop appropriate management for many European cephalopod fisheries, given that cephalopods are not quota species under the Common Fisheries Policy. Here we briefly review potential barriers to sustainable fishing an...
Article
Fin whales and sei whales are two migratory baleen whale species sighted every year across the waters of the Azores. Improved understanding of the ecological niche and habitat requirements of these baleen whales is needed to identify persistent or predictable oceanographic events that may set the time of their migration, as well as local or ephemer...
Article
Full-text available
Knowledge of stock structure is a priority for effective assessment of commercially-fished cephalopods. Loligo forbesii squid are thought to migrate inshore for breeding and offshore for feeding and long-range movements are implied from past studies showing genetic homogeneity in the entire neritic population. Only offshore populations (Faroe and R...
Chapter
Full-text available
https://www.iucnredlist.org/species/189865869/189865884
Article
Full-text available
Shorewatch is a citizen science project, managed by Whale and Dolphin Conservation (WDC), that records the occurrence of cetaceans during regular, standardized watches from a series of locations along the coast of Scotland (United Kingdom). Observer training and a clearly defined protocol help deliver a valuable source of information about cetacean...
Preprint
Full-text available
The feeding ecology of broadbill swordfish (Xiphias gladius) in the California Current was described based on analysis of stomach contents collected by federal fishery observers aboard commercial drift gillnet boats from 2007 to 2014. Prey were identified to the lowest taxonomic level and diet composition was analyzed using univariate and multivari...
Poster
Full-text available
El delfín común de hocico corto (Delphinus delphis) es uno de los cetáceos más abundantes del Atlántico (SCANS-II, 2006). Se alimenta principalmente de pequeños peces pelágicos y ricos en energía (Spitz et al., 2010a,), pero con ligeras variaciones según las fluctuaciones en la distribución de sus presas (Silva, 1999, Santos, 2013). Los cetáceos so...
Poster
Full-text available
Persistent organic pollutants, in particular polychlorinated biphenyls, pose a major threat to marine mammals due to their bioaccumulation and biomagnification effects. These contaminants enter the body almost exclusively through the diet and might act as endocrine disruptors, affecting animal reproduction success. Samples from 160 common dolphins...
Article
Full-text available
Data on species occurrence at the scale of their distributional range and the determination of their habitat use requirements are essential to support conservation and define management plans that account for their habitat requirements. For wide-ranging species, such as cetaceans, especially considering that their marine habitats include offshore a...
Preprint
Full-text available
In order to encourage cephalopod fisheries along the pathway towards sustainability, we developed a Sustainability Toolkit for Cephalopod Fisheries. This document was developed to engage cephalopod fishery and value chain stakeholders who are seeking (or already) following a pathway to sustainability. Our main aim is to provide information for stak...
Research
Full-text available
This policy brief aims at providing a concise summary of scientific information that can help managers and policy-makers make informed decisions about the sustainability of cephalopod fisheries. It contains 10 important current issues affecting cephalopods and proposed possible solutions regarding the following topics: natural highs and lows in abu...
Technical Report
Full-text available
This booklet provides a summary of the main results obtained during the last three and a quarter years (2018-2021) of the Cephs & Chefs project, including: a brief overview of the octopus global trade network, with focus on the Portuguese and Spanish markets and value chains; an outline of market initiatives for cephalopod fisheries; insights about...
Article
With the depletion of many commercial fish stocks and an increasing demand for marine protein for human consumption, cephalopods have become more important as a fishery resource. In EU waters, cephalopod stocks are not routinely assessed and exploitation of these species by large-scale fisheries is largely unregulated. For sustainable exploitation,...
Article
Full-text available
Marine mammals can play important ecological roles in aquatic ecosystems, and their presence can be key to community structure and function. Consequently, marine mammals are often considered indicators of ecosystem health and flagship species. Yet, historical population declines caused by exploitation, and additional current threats, such as climat...
Article
The striped dolphin, Stenella coeruleoalba, is one of the most abundant cetacean species off the Western Iberian coast, however, studies on the species regarding biology, ecology, threats or conservation efforts are lacking. This study investigates stranding patterns (years 1981–2014) and diet (2002-2014) of striped dolphins (Stenella coeruleoalba)...
Article
The striped dolphin, Stenella coeruleoalba, is one of the most abundant cetacean species off the Western Iberian coast, however, studies on the species regarding biology, ecology, threats or conservation efforts are lacking. This study investigates stranding patterns (years 1981–2014) and diet (2002–2014) of striped dolphins (Stenella coeruleoalba)...
Article
Globally, cephalopods support large industrial-scale fisheries and small-scale to partly large-scale local artisanal fisheries. They are of increasing economic importance as evidenced by the rapid rise in their global landings from 1950 to 2014. Cephalopods are sensitive to environmental variability and climate change and many if not all species sh...
Article
The European Union (EU) is one of the most important markets for cephalopods in the world. Currently, small-scale fisheries targeting octopus in the EU are of considerable social and economic importance, especially in southern European waters where more octopus are consumed as part of the traditional diet. Octopus in Europe are excluded from quota...
Article
Full-text available
Aim To describe distribution patterns and species richness of cetaceans along a wide geographical range using occurrence data coupled with survey effort, from poorly studied oceanic areas. Specific objectives were to compare species richness and relative abundances among sub‐regions and to describe the distribution of each species. Location Easter...
Article
Harbour porpoises in the Iberian Peninsula form a genetically distinct, small (around 2900 animals) and isolated population. Their main prey are commercially important fish, hence overlap between porpoise occurrence and fishing activity is almost inevitable. We compile information on bycatch mortality, mainly collected over the last 15 years, based...
Article
Minimum landing sizes (MLS) are commonly used to manage crustaceans and are generally set above the size at first maturity to ensure that some protection is afforded to exploited stocks. Despite the economic importance of the brown crab fishery in Scotland, the species is considered data-poor and only limited information is available on size-at-mat...
Article
Brown crab (Cancer pagurus) is a widely distributed crustacean that occurs around the British coastline supporting important commercial fisheries. The habitat preferences of brown crab around Scotland are poorly documented and for the purposes of stock assessment, the species is considered data-poor. Based on an analysis of dredge and trawl surveys...
Technical Report
Full-text available
The Working Group on Cephalopod Fisheries and Life History (WGCEPH) improves knowledge about and the assessment of cephalopods as an exploited resource. WGCEPH report provides information on status and trends in cephalopod stocks; preliminary assessments of selected stocks update information on life history parameters; social and economic profile...
Article
Full-text available
Cephalopods have become an important global food source, but their sustainable management is challenged by unique life history characteristics associated with short lifespans and semelparous reproduction, high natural mortality rates, rapid and often nonasymptotic growth, and complex population structures. Weak stock-recruitment relationships toget...
Article
Full-text available
We documented the parasite faunas of the spiral valves of blue sharks Prionace glauca (L. 1758) and common thresher sharks Alopias vulpinus (Bonnaterre, 1788) caught in the California Current Large Marine Ecosystem (CCLME) north of the Mexican border. The spiral valves of 18 blue and 19 thresher sharks caught in the CCLME from 2009 to 2013 were exa...
Article
Full-text available
Marine landings in Portugal have decreased at a higher rate than fishing effort in the last 20 years. Identifying the variables driving the quantity and composition of landings is pivotal to understand the dynamics of the fisheries sector, which entails complex social and environmental aspects. In this study, we investigate the main drivers of mari...
Article
Understanding the processes that influence octopus abundance is important in order to manage the fishing grounds and offer advice on the exploitation of this important resource. Fluctuations in abundance of exploited stocks may be due to a great variety of factors. However, in short-lived animals such as cephalopods, in which abundance depends on s...
Poster
Full-text available
Blue whales are sighted every year around the Azores islands, which apparently provide an important seasonal foraging area. In this study we aim to characterize habitat preferences and analyse the temporal distribution of blue whales around São Miguel Island. To do so, we applied Generalized Additive Models to a seven-year opportunistic cetacean oc...
Article
Full-text available
The short‐beaked common dolphin is one of the most numerous cetacean species in the North‐East Atlantic and plays a key functional role within the ecosystem as a top predator. However, in 2013, its conservation status for the European Marine Atlantic, under Article 17 of the Habitats Directive, was assessed as ‘Unfavourable‐Inadequate’. Of key conc...
Article
Full-text available
Distribution maps of cetaceans and seabirds at basin and monthly scales are needed for conservation and marine management. These are usually created from standardised and systematic aerial and vessel surveys, with recorded animal densities interpolated across study areas. However, distribution maps at basin and monthly scales have previously not be...
Article
Global changes drive abundance and distribution of species worldwide. It seems that at least some cephalopod stocks profit from global changes as indicated by increases in biomass and/or expansion of their geographical distribution, as appears to be the case for the commercially important ommastrephid squid Illex coindetii, in the North Sea. Based...
Article
Full-text available
The CETUS project is a cetacean monitoring program that takes advantage of cargo ships to undertake survey routes between Continental Portugal, Macaronesian archipelagos and West Africa. From 2012 to 2017, over 50 volunteers participated in the program, actively surveying more than 124.000 km, mostly beyond national jurisdictions in the high seas,...
Article
In the last few decades, there has been a remarkable development of niche models to help understand the ecological response of species to current rapid environmental changes. In the present study, we applied niche modelling to the megafauna community of shelf waters of the northwestern (NW) and northern Iberian Peninsula in order to analyse the coe...
Article
Full-text available
Cephalopods are a versatile group with several mechanisms in place to ensure the success of future generations. The Patagonian long-finned squid (Doryteuthis gahi) populations on the southern Patagonian shelf are believed to be genetically homogenous, but the mechanisms connecting them geographically and temporally are unresolved. Individual growth...
Article
Full-text available
The eastern North Atlantic (ENA) has many highly productive areas where several species of cetaceans have been recorded, with the common dolphin (Delphinus delphis) being one of the most frequently sighted species. However, its spatial and temporal distribution in high seas is poorly known. The study presents the results from 5 years of cetacean mo...
Article
Full-text available
Background: Nematodes of the genus Anisakis parasitize many commercial fish species and are responsible for a fish-borne zoonosis (anisakiasis) and allergic reactions. Anisakis can also cause consumer distrust in fishery products and economic losses to the fish industry. Scope and approach: We review current socioeconomic, legislative, risk managem...
Chapter
Full-text available
The diverse characteristics, values, and importance of small-scale fisheries imply at least two key considerations. First, there is no tailor-made, one-size-fits-all solution to the problems and challenges facing small-scale fisheries; thus, policy and governance must be sensitive to the contexts. Second, the close relationship and interactivity be...
Chapter
Small-scale fisheries require knowledge in decision-making, particularly as they face many of the same issues affecting large-scale, industrial fisheries, such as declining fish stocks, marine habitats degradation, resource use competition, and climate change. There are other characteristics of small-scale fisheries, however, that cause additional...
Article
Full-text available
Cephalopod populations exhibit high variability in life history characteristics, such as longevity and size-at-age. The aim of this study was to understand how characteristics of a newly described ‘superbull’ male morph in Doryteuthis gahi populations (Patagonian Shelf) arise and whether there is a selective advantage. At the population level, it i...
Article
Plastic debris is currently recognised as one of the major global threats to marine life. However, few data exist on the presence and abundance of microplastics (plastics < 5 mm in size) in marine mammals. This is the first record of the presence of microplastics in the digestive tracts of marine mammals from the Iberian Peninsula. This study made...
Poster
Full-text available
Censos en Transectos Lineales entre Mayo y Agosto desde 2004 hasta 2015 buques de carga (plataforma oportunista) La Marsopa Común es una de las especies de cetáceo mas frecuentes de la costa NE de Escocia. Existe un gran desconocimiento de sus preferencias ecológicas y los patrones de ocurrencia en esta área, requerimiento principal para poder dete...
Poster
Los análisis de los contenidos estomacales de mamíferos marinos proporcionan información valiosa sobre su dieta, ecología y uso de hábitat, además de ayudar a entender posibles conflictos con la pesca. Aunque las dietas de otras especies de cetáceos en el noroeste de la Península Ibérica se han estudiado en detalle, hay muy poca información disponi...
Article
Full-text available
Blue whales are sighted every year around the Azores islands, which apparently provide an important seasonal foraging area. In this paper we aim to characterize habitat preferences and analyze the temporal distribution of blue whales around São Miguel Island. To do so, we applied Generalized Additive Models to an opportunistic cetacean occurrence d...
Conference Paper
Full-text available
In the last few decades, there has been a remarkable development of niche models to help understand the ecological response of species to current rapid environmental changes. In the present study, we applied niche modelling to the predator community of the northern and northwestern shelf waters of the Iberian Peninsula to analyse the coexistence of...
Article
The unintended negative consequences of the drive towards open access publishing are becoming increasingly apparent. This paper examines the nature of open access publishing from the perspectives of authors and readers, considering issues of payment and ownership, and the question of open access for data. It discusses the origins of open access, it...
Article
Full-text available
Accurate species classification is essential to understand complete life cycles of cephalopods. Identifying freshly caught or fixed loliginid paralarvae to species level with the traditional taxonomic guides is challenging. Therefore, the aim of this work was to identify genetically loliginid paralarvae captured in NW Spain (a region where at least...
Presentation
Full-text available
Accurate species classification is essential to understand complete life-cycles and life-history strategies of cephalopods. Identifying freshly caught loliginid paralarvae to species level with traditional taxonomic guides is difficult, and classifying fixed paralarvae is exceptionally challenging. Hence, the aim of this work was the accurate genet...
Poster
Full-text available
The aim of this study was to identify genetically the cephalopod paralarvae captured in the Ría the Vigo in order to assess species richness. Additionally, we aimed to evaluate the influence of hydrographical variability and the spatio-temporal differences in cephalopod richness Total paralarvae N = 1328 N = 333 SURVEYS 30 night-time and 4 daytime...
Article
Harvesting and exploiting limited fisheries resources in a sustainable manner also implies achieving maximum added value from the raw material. However, the presence of parasites in the products may adversely affect consumer perception and/or pose a direct health hazard. As a major stepping-stone of the PARASITE project, an epidemiological survey w...