802 research outputs found
Age estimation of the Southern Ocean squid Moroteuthopsis longimana using beaks collected from predators' diet: number and increment widths in the rostrum sagittal section of the lower beak
No full textIn this work we used upper and lower beaks of Moroteuthopsis longimana collected from the diet of Antarctic toothfish Dissostichus mawsoni from the Pacific (Ross and Amundsen Seas) and Atlantic (South Sandwich Islands) sectors of the Southern Ocean to study the feasibility of using beaks collected from predators’ stomachs to study the age of Southern Ocean oceanic squid and to estimate the age and growth patterns of M. longimana. We analysed the presence of micro-increments in the rostrum sagittal section (RSS) and the lateral wall of both upper and lower beaks. Lower beak’s RSS was the only section where it is possible to observe and count a readable sequence of increments that allowed to estimate the age of oceanic squid using beaks collected from predators’ stomachs.
This dataset contains the number and width of increments found in the RSS of the 10 M. longimana’s lower beaks used in this study. Further information related with the studied beaks such as beak measurements, origin and sample date can be found in the published article.
This dataset is associated with the article: Queirós JP, Bartolomé A, Piatkowski U, Xavier JC, Perales-Raya C (2023) Age and growth estimation of Southern Ocean squid Moroteuthopsis longimana: can we use beaks collected from predators’ stomachs? Marine Biology 170, 10. DOI 10.1007/s00227-022-04156-2This work was supported by the strategic program of Marine and Environmental Sciences Centre (MARE), financed by the FCT (UIDB/704292/2020). JPQ was supported by a FCT/MCTES through national funds (PIDDAC) and Portuguese Polar Program (PROPOLAR) and by FCT PhD scholarship co-financed by FSE (SFRH/BD/144320/2019)
A phylogeny of fossil and living neocoleoid cephalopods
No full textColeoid cephalopod phylogeny is well studied via both molecular and morphological data, yet although some agreement has been reached (e.g. that extant Decapodiformes and Octopoda are monophyletic) many details remain poorly resolved. Fossil coleoids, for which much data exists, have hitherto not been incorporated into analyses. Their inclusion is highly desirable for the support of neontological phylogenies, to better reconstruct character-state histories, and to investigate the placement of the fossil groups themselves. In this study we present and analyse a morphological data matrix including both extinct and extant taxa. Homology assumptions in our data are discussed. Our results are presented both with and without the constraint of a monophyletic Decapodiformes imposed. When analysed with this constraint our results are strikingly congruent with those from molecular phylogeny, for instance placing Idiosepius in a basal position within Decapodiformes, and recovering Oegopsida and Bathyteuthoidea (although as grades). Our results support an Octopodiformes clade (“vampire squid” Vampyroteuthis as sister to Octopoda) and an octopodiform interpretation for most fossil coleoids. They suggest the fossil sister taxon to the octopods to be Plesioteuthididae. Most fossil higher taxa are supported, although many genera, especially within suborder Teudopseina, appear para- or polyphyletic.5,250
Age and growth estimation of Southern Ocean squid Moroteuthopsis longimana: can we use beaks collected from predators’ stomachs?
No full textSquid play a major role in the Southern Ocean food web. However, their age and growth remain poorly studied. Here, using upper and lower beaks of Moroteuthopsis longimana collected from the diet of Dissostichus mawsoni from Pacific and Atlantic sectors of the Southern Ocean, we studied: (1) Feasibility of using beaks collected from predators’ stomachs to study the age of Southern Ocean oceanic squid; and (2) Age estimation and growth patterns of M. longimana. The rostrum sagittal section (RSS) of both beaks had micro-increments, with the lower beak being the best to observe and count a readable sequence of increments to estimate the age. Assuming a daily deposition of increments, our results suggest that M. longimana can live up to 820 days and may hatch throughout the year. Studied individuals presented a consistent growth rate from hatching to death but with, at least, one period of faster growth. A novel pattern of regular cycles, composed of 7–10 lighter increments followed by a darker one, was found in the medium-anterior region of the RSS. Differences were found in the growth rate and size reached at the same age between individuals from the Pacific and Atlantic sectors, which might be related with different environmental conditions between both capture sites. This study shows that lower beaks from predators’ stomachs can be used to study the age of Southern Ocean squids and that M. longimana hatches in all seasons, being available year round to predators that feed of this species
Maximum age of the common octopus (Octopus vulgaris) in its natural habitat and stress marks by using beaks of spent individuals
No full textBeaks have been used for ageing cephalopods, mainly in octopods where statoliths are not suitable for ageing. Recently it has been validated the daily deposition of beak increments in Octopus vulgaris (Cuvier, 1797) both, in the internal lateral wall surfaces (LWS) (Canali et al., 2011; Perales-Raya et al., under review) and also in the rostrum sagittal sections (RSS) (Perales-Raya et al., under review). LWS is more accurate for estimation of absolute age because RSS seem to underestimate the absolute ages due to tip erosion of the beak during feeding (Perales-Raya et al., 2010). However, RSS have recently shown in captive individuals the deposition of stress marks (checks) related to induced events such as capture, confinement, thermal changes and the handling during chemical marking (Perales-Raya et al., under review). This is the first study of beaks as life recorders of environmental stress in the wild
Identifying author-inventors from Spain: methods and a first insight into results
No full textThe aim of this paper is to describe a matching and disambiguation methodology for the identification of author-inventors located in the same country. It aims to maximize precision and recall rates by taking into account national name writing customs in the name matching stage and by including a recursive validation step in the person disambiguation stage. An application to the identification of Spanish author-inventors is described in detail, where all SCOPUS 2003-2008 publications of Spanish authors are matched to all 1978-2009 EPO applications with Spanish inventors. Using this data, we identify 4,194 Spanish author-inventors. A first look at their patenting and publication patterns reveal that Spanish author-inventors make quite a significant contribution to the overall country’s scientific and technological production in the time periods considered: 27% of all EPO patent applications invented in Spain and 15% of all SCOPUS scientific articles authored in Spain, with important differences across fields and excluding journals in non-technologically relevant fields.Peer reviewe
Ontogeny of upper beak in Octopus vulgaris (Cuvier, 1797)
No full textThe beak is a fundamental component of the digestive system and is also used for age estimation in Octopus vulgaris. Nevertheless, the embryonic development of the beak is still largely unexplored. With this aim, upper jaws were observed and photographed using a wet coverslip with Differential Interference Contrast microscope. Pictures were analysed to obtain the measurements of upper jaws. We described the successive embryonic phases, and the beak structural features to assess the presence of pre-hatching increments in Lateral walls and the Rostrum. Three main phases were identified during the embryonic beak ontogeny. In a first phase the beak is a rudiment. The second phase begins when appears the layer originating the Hood. The third phase is characterized by the begin of sclerotization process. The Rostrum starts to be visible when embryos assume the hatching competence and the accuracy of the ageing method using the Rostrum surface was confirmed. On the contrary, several increments are visible on the lateral walls and none of them is related to specific embryonic event. A morphometric analysis was carried out, exploring similarities between growth pattern of different regions of the beak. In terms of growth rate, in the Rostrum the relative growth rate decreased in late ontogeny suggesting that modifications could be related with hardness, rather than size increase.In a second experiment the influence of temperature on beak growth was analysed. Using egg clusters reared at different temperatures, overall sizes of beaks and similarities between growth pattern of different beak regions are compared for a better understanding of the environmental effect in the beak development. In terms of beaks’ overall size, individual variability increased in the temperature conditions other than 19° and beaks reared at warm temperature, which were smaller than the rest of individuals. A relationbetween growth rate and areas of beak and effect of temperature was not confirmed
Determinación de la edad y estudio del crecimiento del choco (Sepia hierredda Rang, 1837), el calamar (Loligo vulgaris Lamarck, 1798) y el pulpo (Octopus vulgaris Cuvier, 1797) de la costa noroccidental africana
No full textSe aplicó el método anatómico para determinar la edad en las especies de cefalópodos de la pesquería existente en la costa noroccidental africana: el choco (Sepia hierredda Rang, 1837) el pulpo (Octopus vulgaris Cuvier, 1797) y el calamar (Loligo vulgaris Lamarck, 1798). Se investigaron los estatolitos, las conchas internas, las mandíbulas y los cristalinos, desarrollándose en algunos casos técnicas pioneras en este campo, debido a la carencia de este tipo de estudios en especies bentónicas. Finalmente se seleccionaron 150 estatolitos y 60 conchas internas de choco, 121 estatolitos de calamar y 70 mandíbulas en pulpo (la superior e inferior de 25 individuos del Banco Sahariano y la superior de 20 hembras post-puesta de Cabo Blanco, para una posible validación indirecta en la naturaleza). Dichas hembras se dividieron en dos grupos de edad según el desarrollo de la puesta, ya que mueren tras la eclosión de los últimos embriones. El análisis de los estatolitos con microscopía óptica y electrónica reveló la existencia de nuevos elementos estructurales, no descritos con anterioridad y donde se identificaron ocasionalmente incrementos. Se utilizaron los incrementos del domo lateral y del rostro en los estatolitos de choco y de calamar respectivamente, y los incrementos de la mandíbula superior de pulpo, donde no se observaron indicios de erosión mecánica. La relación logarítmica entre el número de lamelas de la concha interna del choco y la edad podría permitir su estimación a partir de los sepiones, cuya preparación y lectura es más sencilla. El ritmo de deposición de las lamelas resultó elevado, incrementándose con la maduración del individuo. En las tres especies se asignó una periodicidad diaria a cada incremento, que el choco y el calamar ha sido validada para especies similares. En el choco, el cambio observado en la anchura de los incrementos a partir del incremento 70 parece estar relacionado con el inicio de la maduración sexual, mientras que en pulpo el cambio que se produce en el incremento 45 se relacionó con el cambio de vida pelágica a bentónica. El aumento de talla con la edad fue potencial en las tres especies, existiendo en el choco y el calamar un crecimiento diferencial según la época de eclosión, y según la madurez en las hembras de calamar. El crecimiento en peso del pulpo fue exponencial, haciéndose lineal al iniciarse la puesta y negativo en las hembras terminales de mayor edad. Las edades máximas de entre 8 y 10 meses obtenidas para las tres especies en el Banco Sahariano indicaría un ciclo de vida anual, aunque el pulpo de Cabo Blanco mostró un ciclo biológico semestral, que indicaría la existencia de dos cohortes sucesivas al año
Applying the Data Collection Framework (DCF) to fisheries systems in the ORs: state of play and challenges in the Canary Islands
No full text- …
