Browsing by Author "Lefkaditou, Evgenia"
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- Eledone moschata (Lamarck, 1798)Publication . Sobrino, Ignacio; Moreno, Ana; Jereb, Patrizia; Balguerias, Eduardo; Seixas, Sónia; Pierce, Graham; Lefkaditou, Evgenia; Allcock, Louise
- Gonatus fabricii (Lichtenstein, 1818)Publication . Piatkowski, Uwe; Zumholz, Karsten; Jereb, Patrizia; Seixas, Sónia; Oesterwind, Daniel; Lefkaditou, Evgenia; Allcock, Louise; Pierce, Graham; Oleg, Katugin
- 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.
- Loligo vulgaris Lamarck, 1798Publication . Moreno, Ana; Lefkaditou, Evgenia; Robin, Jean-Paul; Pereira, João; González, Angel F.; Seixas, Sónia; Villanueva, Roger; Pierce, Graham; Allcock, Louise; Jereb, Patrizia
- Sepia elegans Blainville, 1827Publication . Jereb, Patrizia; Sobrino, Ignacio; Allcock, Louise; Seixas, Sónia; Lefkaditou, Evgenia
- Sepia orbignyana Férussac in d’Orbigny, 1826Publication . Jereb, Patrizia; Sobrino, Ignacio; Allcock, Louise; Seixas, Sónia; Lefkaditou, Evgenia
- The significance of cephalopod beaks as a research tool: an updatePublication . Xavier, José C.; Golikov, Alexey V.; Queirós, José P.; Perales-Raya, Catalina; Rosas-Luis, Rigoberto; Abreu, José; Bello, Giambattista; Bustamante, Paco; Capaz, Juan C.; Dimkovikj, Valerie H.; González, Angel F.; Guímaro, Hugo; Guerra-Marrero, Airam; Gomes-Pereira, José N.; Kubodera, Tsunemi; Laptikhovsky, Vladimir; Lefkaditou, Evgenia; Lishchenko, Fedor; Luna, Amanda; Liu, Bilin; Pierce, Graham; Pissarra, Vasco; Reveillac, Elodie; Romanov, Evgeny V.; Rosa, Rui; Roscian, Marjorie; Rose-Mann, Lisa; Rouget, Isabelle; Sánchez, Pilar; Sánchez-Márquez, Antoni; Seixas, Sónia; Souquet, Louise; Varela, Jaquelino; Vidal, Erica A. G.; Cherel, YvesThe use of cephalopod beaks in ecological and population dynamics studies has allowed major advances of our knowledge on the role of cephalopods in marine ecosystems in the last 60 years. Since the 1960’s, with the pioneering research by Malcolm Clarke and colleagues, cephalopod beaks (also named jaws or mandibles) have been described to species level and their measurements have been shown to be related to cephalopod body size and mass, which permitted important information to be obtained on numerous biological and ecological aspects of cephalopods in marine ecosystems. In the last decade, a range of new techniques has been applied to cephalopod beaks, permitting new kinds of insight into cephalopod biology and ecology. The workshop on cephalopod beaks of the Cephalopod International Advisory Council Conference (Sesimbra, Portugal) in 2022 aimed to review the most recent scientific developments in this field and to identify future challenges, particularly in relation to taxonomy, age, growth, chemical composition (i.e., DNA, proteomics, stable isotopes, trace elements) and physical (i.e., structural) analyses. In terms of taxonomy, new techniques (e.g., 3D geometric morphometrics) for identifying cephalopods from their beaks are being developed with promising results, although the need for experts and reference collections of cephalopod beaks will continue. The use of beak microstructure for age and growth studies has been validated. Stable isotope analyses on beaks have proven to be an excellent technique to get valuable information on the ecology of cephalopods (namely habitat and trophic position). Trace element analyses is also possible using beaks, where concentrations are significantly lower than in other tissues (e.g., muscle, digestive gland, gills). Extracting DNA from beaks was only possible in one study so far. Protein analyses can also be made using cephalopod beaks. Future challenges in research using cephalopod beaks are also discussed.