179,078 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
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
Ontogeny of upper beakin Octopus vulgaris Cuvier, 1797
No full textWe describe for the first time the formation of upper beak in Octopus vulgaris from embryonic stage XIV (Naef, 1928) up to paralarval stage, focusing on the main regions used for age estimation and assessing the presence of any pre-hatching increments in the beak microstructur
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
Jalur WisataTumbuhan Obat di Kebun Raya Bogor
No full textBuku ini menyediakan banyak informasi tentang manfaat tumbuhan obat yang dapat kita gunakan khususnya yang ada di Kebun Raya Bogor. Buku ini juga menyajikan jalur wisata yang akan kita lalui karena setiap jalur memiliki waktu tempuh rata-rata satu jam, namun memiliki perbedaan pada kondisi topografi dan jumlah kalori tubuh yang akan terbakar saat menelusuri jalur wisata. Mari memulai petualang dengan membaca buku ini terlebih dahulu, kemudian langkahkan kaki untuk menikmati koleksi tumbuhan obat di Kebun Raya Bogor.xvii, 276 p. : col. ill. 15 c
Types of Emotion Regulation and Their Associations with Gambling: A Cross-Sectional Study with Disordered and Non-problem Ecuadorian Gamblers (R code and JASP file)
No full textR Code and JASP file for analyses in Jara-Rizzo, M., Perales, J. C., Catena, A., & Navas, J. F. (2018). Against the odds in Ecuador: A cross-cultural replication and extension of the role of emotion regulation in gambling behavior. Submitted
Exploring the embryonic development of upper beak in Octopus vulgaris Cuvier, 1797: New findings and implications for age estimation
No full textThe beak of cephalopods (in particular octopods, where statoliths are not suitable) is a useful tool for age estimation and the aging method provides essential information on cephalopod growth and life cycles. These parameters are valuable in the assessment of population dynamics and stock management. The embryonic development of cephalopod beaks is poorly known. The presence of pre-hatching increments on the reading areas (rostrum and lateral walls) is unclear and there are no data on temperature influence. In this study, egg clusters of Octopus vulgaris were reared at 16, 19, 21, 23, and 26 °C. The extracted upper jaws were observed in order to validate the age of first daily increment formation, assessing the accuracy of age inferred from the two reading areas. Jaw dimensions were also measured in order to explore the development at different temperature conditions. The growth rate was calculated for beaks of rearing condition 21 °C, and the overall dimensions were compared among all incubation temperatures. Three ad hoc developmental stages are proposed for the upper beak of O. vulgaris embryos. Increments on lateral walls appear during the second phase, whereas the first increment on the rostrum is visible only at hatching. Consequently, only the accuracy of age inferred from the rostrum surface is confirmed for the early stages. The growth rate of the rostrum region accounted for a drop in growth during the third phase. Conversely, the growth rate increased until hatching in lateral walls, suggesting that the heterogeneity of the growth rate could be due to the different role played by the beak areas. Temperature influenced beaks in terms of overall size, as embryos reared at a warm temperature (23 °C) were smaller than the others. These results confirm that the incubation environment could alter hatchling characteristics thus affecting the recruitment conditions
The Implementation of English Learning in New Normal Situation at SDN Percobaan Palangka Raya
No full textThe research aimed to describe: (1) the implementation of English learning in new normal situation at SDN Percobaan Palangka Raya, (2) the obstacles faced of English learning in new normal situation at SDN Percobaan Palangka Raya, and (3) the efforts to overcome the obstacles faced of English learning in new normal situation at SDN Percobaan Palangka Raya. This research used the descriptive-qualitative method. The subjects were an English teacher and students of class IV-C. Research data was obtained through observation and interviews. Data analysis was analyzed through data reduction, data display, and conclusion drawing. The findings revealed that English learning in a new normal situation at SDN Percobaan Palangka Raya implements face-to-face learning where an English lesson is carried out within an hour. During English learning, students were passive. The English teacher used the lecture, demonstration, question-answer, and assignment methods to convey the material. The obstacles faced during English learning were the different students’ learning motivations and lack of understanding of the learning material. In overcoming the obstacles, an English teacher seeks to manage the classroom atmosphere and guide students who do not understand the material by repeating the learning explanation
- …
