Browsing by Author "Abad, Esther"
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- Impacts of anthropogenic activities on cephalopodsPublication . Pierce, Graham; Abad, Esther; Allcock, Louise; Badouvas, Nicholas; Barrett, Christopher; González-Gómez, Roberto; Hendrickson, Lisa; Lefkaditou, Evgenia; Lonsdale, Jemma; Matos, Fábio; Moustahfid, Hassan; Oesterwind, Daniel; Perales-Raya, Catalina; Pita, Cristina; Power, Anne Marie; Roumbedakis, Katina; Seixas, Sónia; Valeiras, Julio; Villasante, Sebastián; Laptikhovsky, Vladimir; Robin, Jean-Paul; Lishchenko, FedorIn past centuries, the impacts on cephalopods from humankind were negligible. The first documented small-scale exploitation of cephalopods occurred in the Mediterranean and Asia. Between 1950-2019, global cephalopod catches increased by about an order of magnitude, from 0.5 million tones to a peak of 4.85 million tons. The human impact on the oceans also increased substantially in this period. Human-induced climate change, habitat destruction, increased marine traffic, development of coastal infrastructure, pollution and growing fishing effort, may all have had negative impacts on cephalopod populations. But while the responses to anthropogenic impacts have been investigated for many ecosystem components, those for cephalopods are largely unknown. Cephalopods are sensitive to multiple environmental variables such as ocean temperature and dissolved oxygen concentrations, while geographic shifts in distribution in response to temperature changes are already documented. Their sensitivities to other human pressures are beginning to emerge, but most of these still need to be examined. How much habitat has been lost? How does noise affect cephalopods? What are the lethal thresholds for various chemical pollutants, or how may these act to inhibit reproduction? Does light pollution impact cephalopods? With such knowledge gaps, it is difficult to predict how cephalopods will respond to increasing human impacts. Our study aims to provide a review of what is known about anthropogenic impacts on cephalopods and their potential responses to these impacts. This information can be used to identify the research priorities for improving our understanding of human-induced impacts on cephalopods and the development of mitigation measures.
- Management for sustainable cephalopod fisheries in Europe: review and recommendationsPublication . Pierce, Graham; Abad, Esther; Ainsworth, Gill; Alcock, Loise; Bobowski, Bianca; Gonzalez, Angel; Gras, Michael; Hendrickson, Lisa; Iriondo, Ane; Laptikhovsky, Vladimir; Larivain, Angela; Longo, Katie; Macho, Gonzalo; Matos, Fabio; Monteiro, Silvia; Montero-Castaño, Carlos; Moreno, Ana; Moustahfid, Hassan; Oesterwind, Daniel; Pita, Cristina; Roa-Ureta, Ruben; Robin, Jean- Paul; Roumbedakis, Katina; Seixas, Sónia; Sobrino, Ignacio; Valeiras, Julio; Villasante, Sebastian; Power, Anne MarieAlthough cephalopod fisheries are of world-wide importance, in Europe catching cephalopods is managed only in small-scale fisheries, at national level, and few stocks are formally assessed. Because cephalopods are not quota species under the EU’s Common Fisheries Policy, there is currently no requirement for assessment or management at European level. Given increasing interest in targeting cephalopods in Europe, there is a risk that they will be fished unsustainably. Although there have been recent review papers on progress in stock assessment and fishery forecasting for commercially fished cephalopods there has been no recent review of cephalopod fishery management. We aim to fill this gap, with a particular focus on European cephalopod fisheries.We review potential barriers to sustainable fishing and reasons why management of cephalopod fisheries differs from that for finfish fisheries, e.g. due to the high inherent volatility and the possibly cyclic nature of year-to-year variation in cephalopod abundance, reflecting their short lifespan, rapid growth and high sensitivity to environmental conditions. We review fishery management approaches in important cephalopod fisheries worldwide (e.g. in the USA, Japan, Falklands, South Africa, Australia and Russia) and current management of small-scale cephalopod fisheries in Europe. We identify knowledge gaps and limitations to current monitoring programmes and stock assessments and discuss the options available for cephalopod fishery management in Europe, considering the suitability or otherwise of catch and effort limits, use of closed areas and seasons, restrictions on sizes caught and types of fishing gear, and the ole of market-based sustainability pathways.
- Spatial distribution of Cephalopods of the European Shelf and their associated oceanographic parameters based on occurrence in standardized demersal fishing trawlsPublication . Oesterwind, Daniel; Matos, Fábio; Abad, Esther; Certain, Gregoire; Fotiadis, Nikolaos; Gonzales, Ángel; Laptikhovsky, Vladimir; Lishchenko, Fedor; Moreno, Ana; Monteiro, Silvia; Montero, Carlos; Moustahfid, Hassan; Pierce, Graham; Power, Anne Marie; Robin, Jean-Paul; Seixas, Sónia; Valeiras, JulioChanging oceans impact the whole marine ecosystem in different ways. For example, rising ocean temperatures can affect the presence / absence of species, especially when local environmental conditions exceed individual species’ physiological tolerances. Accordingly, climate change has caused shifts in distribution and expansions for various cephalopods worldwide. Cephalopods play an important role in the ecosystem, especially in food webs. Consequently, spatial distribution shifts might help explain observed ecosystem changes. Therefore, maps for cephalopod distributions need to be reviewed and updated. Meanwhile, information on the associated environmental conditions will permit future occurrence of cephalopods to be modelled, which is interesting from a fishery and ecological perspective. Some information about physiological tolerances of cephalopods are known from laboratory studies and aquaculture experience, as well as from field observations. Laboratory data are often based on narrow ranges, depending on the experimental design, and can therefore provide only a limited understanding of physiological tolerances. On the other hand, field observations are also limited due to the spatial and temporal limitations of surveys, but these might provide a more realistic picture of natural tolerances. Here, we use the ICES Datras dataset to, first, describe the current distribution of cephalopods associated with the European shelf and, second, advance the knowledge regarding environmental ranges of the various species included in the analysis by combining occurrence data with in-situ oceanographic data. An additional literature review will provide information about the different environmental requirements of various life stages. The results allow us to increase the knowledge of physiological preferences of various cephalopod species within the North-East Atlantic Ocean. Finally, we will discuss and present potential future trends in cephalopod occurrence within the NE Atlantic. In order to further strengthen our knowledge of physiological tolerances of various cephalopod species more data on life history and life stages is needed to develop a more advanced mechanistic model.
- Working group on cephalopod fisheries and life history (WGCEPH; outputs from 2019 meeting)Publication . Abad, Esther; Badouva, Nicholas; Fotiad, Nikolaos; González, Ángel; Iriondo, Ane; Juarez, Ana; Karatza, Alexandra; Laptikhovsky, Vladimir; Larivain, Angela; Lefkadito, Evgenia; Lishchenko, Fedor; Matos, Fábio; Moreno, Ana; Monteiro, Silvia; Oesterwind, Daniel; Perales-Raya, Catalina; Petroni, Michael; Piatkowski, Uwe; Pierce, Graham John; Pita, Cristina; Power, Anne Marie; Robin, Jean-Paul; Rocha, Alberto; Samara, Elina; Santurtun, Marina; Seixas, Sónia; Silva, Luis; Smith, Jennifer; Sobrino, Ignacio; Valeiras, Julio; Villasante, Sebastian
- Working group on cephalopod fisheries and life history (Wgceph; outputs from 2022 meeting)Publication . Abad, Esther; Ainsworth, Gillian; Akselrud, Caitlin; Allcock, Louise; Badouvas, Nicholas; Baker, Krista; Barrett, Christopher; Bobowski, Bianca; Carreira, Xose; Certain, Gregoire; Dinis, David; Escánez, Alejandro; Fotiadis, Nikolaos; Ganias, Konstantinos; Golikov, Alexey; Gonzalez, Angel; Gonzalez Gomez, Roberto; Gonzalez, Jose Gustavo; Hendrickson, Lisa; Iriondo, Ane; Seixas, Sónia; Jone, Jessica; Juare, Ana; Jurado-Ruzaf, Alba; Karatz, Alexandra; Kousteni, Vasiliki; Laptikhovsky, Vladimir; Larivain, Angela; Lefkaditou, Eugenia; Lishchenko, Fedor; Rivero, Gonzalo; Matos, Fábio; Marcou, Anna; Maximenko, Darya; Monteiro, Sílvia; Montero, Carlos; Moreno, Ana; Moustahfid, Hassan; Oesterwind, Daniel; Otero, Jaime; Perales-Raya, Catalina; Petroni, Michael; Pierce, Graham; Pita, Cristina; Pita, Pablo; Marie Power, Anne; Roa-Ureta, Ruben; Robin, Jean-Paul; Rocha, Alberto; Roumbedakis, Katina; Sheerin, Edel; Silva, Luis; Sobrino, Ignacio; Smith, Jennifer; Spence, Michael; Valeiras, Julio; Vidoris, Pavlos; Villanueva, Roger; Villasante, Sebastian; Vossen, Kathrin; Zimina, VictoriaWGCEPH worked on six Terms of Reference. These involved reporting on the status of stocks; reviewing advances in stock identification, assessment for fisheries management and for the Ma- rine Strategy Framework Directive (MSFD), including some exploratory stock assessments; re- viewing impacts of human activities on cephalopods; developing identification guides and rec- ommendations for fishery data collection; describing the value chain and evaluating market driv- ers; and reviewing advances in research on environmental tolerance of cephalopods. ToR A is supported by an annual data call for fishery and survey data. During 2019–2021, com- pared to 1990–2020, cuttlefish remained the most important cephalopod group in terms of weight landed along the European North Atlantic coast, while loliginid squid overtook octopus as the second most important group. Short-finned squid remained the least important group in land- ings although their relative importance was almost double in 2019–2022 compared to 1992–2020. Total cephalopod landings have been fairly stable since 1992. Cuttlefish landings are towards the low end of the recent range, part of a general downward trend since 2004. Loliginid squid landings in 2019 were close to the maximum seen during the last 20 years but totals for 2020 and 2021 were lower. Annual ommastrephid squid landings are more variable than those of the other two groups and close to the maximum seen during 1992– 2021. Octopod landings have generally declined since 2002 but the amount landed in 2021 was higher than in the previous four years. Under ToR B we illustrate that the combination of genetic analysis and statolith shape analysis is a promising method to provide some stock structure information for L. forbsii. With the sum- mary of cephalopod assessments, we could illustrate that many cephalopod species could al- ready be included into the MSFD. We further provide material from two reviews in preparation, covering stock assessment methods and challenges faced for cephalopod fisheries management. Finally, we summarise trends in abundance indices, noting evidence of recent declines in cuttle- fish and some octopuses of the genus Eledone. Under ToR C, we describe progress on the reviews of (i) anthropogenic impacts on cephalopods and (ii) life history and ecology. In relation to life history, new information on Eledone cirrhosa from Portugal is included. Under ToR D we provide an update on identification guides, discuss best practice in fishery data collection in relation to maturity determination and sampling intensity for fishery monitoring. Among others, we recommend i) to include the sampling of cephalopods in any fishery that (a) targets cephalopods, (b) targets both cephalopods and demersal fishes or (c) takes cephalopods as an important bycatch, ii) Size-distribution sampling, iii) the use of standardized sampling pro- tocols, iv) an increased sampling effort in cephalopod. Work under ToR E on value chains and market drivers, in conjunction with the Cephs & Chefs INTERREG project, has resulted in two papers being submitted. Abstracts of these are in the report. Finally, progress under ToR F on environmental tolerance limits of cephalopods and climate en- velope models is discussed, noting the need to continue this work during the next cycle.