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Showing 1 to 20 of 33 for “"Cephalopods"”.
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Vision and Bioluminescence in Cephalopods
… and bioluminescence through an examination of cephalopods, a highly visual group that exhibits a broad diversity of eye adaptations and multiple evolutions of bioluminescence. My research investigates (1) vision and behavior in a deep-sea squid with dimorphic eyes, (2) depth-dependent patterns …
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Convergent cognitive evolution: what can be learnt from comparisons with corvids and cephalopods?
… similar vein, others have suggested that coleoid cephalopods (octopus, cuttlefish, squid) may have developed complex cognition convergently with large-brained vertebrates but current evidence is not sufficient to fully evaluate these propositions. The aim of my thesis is to gain further insight …
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Diet of albacore (Thunnus alalunga) and yellowfin tuna (Thunnus albacares) off the south-west coast of South Africa
… Prey items were initially grouped into fish, cephalopods and crustaceans and later identified to the lowest possible taxonomic level, counted, and weighed. The difference in diet between the species was investigated and modelled by Analysis of Similarity (ANOSIM), Non-Metric Multidimensional …
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Feeding ecology of franciscana dolphin, Pontoporia blainvillei (Cetacea:Pontoporiidae), and oceanographic processes on the Southern Brazilian coast
… and adults consumed larger fish prey and more cephalopods. Adult females had similar diet to juveniles, possibly related to parental guidance. Feeding regimes from northern and southern areas also revealed significant differences, where the most important fish prey from the northern area only …
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Protozoi ed Elminti parassiti dei molluschi cefalopodi delle acque circostanti la Sardegna. Morfologia, sistematica, epidemiologia, possibile utilizzo dei parassiti come indicatori bioecologici
Cephalopods are marine organisms which play a crucial role in the food webs of all the world oceans both as preys and predators. They are also actively exploited in many areas, with a rapid increase of their commercial value in the last decades. Despite this, the knowledge on the role of …
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Analysing the evolution of brain size in three clades of carnivora using model selection
… (arboreal, aquatic and fossorial) and dietary (cephalopods and durophagy) factors were associated with the evolution of brain size. Further, body mass was associated with environmental factors (arboreal and fossorial), dietary factors (cephalopods, durophagy, fish and insects), and activity time …
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Exploring Novel Biophysical Mechanisms In Evolved Optical Systems
… The reflectin protein is responsible for giving cephalopods the remarkable ability to manipulate incident light to camouflage with their environment. This unique capability is made possible by iridescent cells composed of over 90% reflectin protein. The highly evolutionarily conserved region of …
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Exploring the Cephalopod Brain: Towards Mapping the First Whole Brain Connectome and Whole Animal Projectome of a Pygmy Squid
Cephalopods have arguably the most complex central nervous system of all studied invertebrates. They possess large, highly centralised brains for processing sensory information, higher cognitive functioning, motor control, and feeding. Cephalopods are known for their ability to solve problems in …
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Variability in the diet of cape fur seals and their interaction with fisheries off the South African coast, 2010-2019
… equations. Fifty-three prey taxa (43 fish, 6 cephalopods, 4 seabirds) were identified from scats, and indices of relative importance (%IRI), mass contribution (%M), numerical abundance (%NA), and frequency of occurrence (%FO) were used to determine the importance of each prey taxon to the …
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Molluscan paleontology of the Pierre Shale (Upper Cretaceous), Bowman County, North Dakota
… of bivalves, and 13 species in 6 genera of cephalopods. </p><p> The stratigraphy of the Pierre Shale in Bowman County was not compiled into a composite section because of the homogeneity of the shale, the lack of distinctive lithologic units, and the slumped condition of the shale. However, …
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Studio sui calamari Loligo vulgaris (Lamarck, 1798) e Loligo forbesii (Steenstrup, 1856) delle acque della Sardegna
… the eye lens, tested here for the first time on cephalopods decapods, has allowed to estimate for both species a life cycle of about 18-20 months. For both squids were also performed morphometric analysis of the beaks and calculated specific correlations with the animal size. Considering the …
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Ecological segregation of burrowing petrels (Procellariidae) at Marion Island
… grew fastest. All three species took mainly cephalopods although Kerguelen Petrels took the most crustaceans and fish. 4. Subantarctic Skuas Catharacta antarctica were important predators of petrels. They preyed upon whatever petrel species were most abundant in an area, although large …
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Revisão taxonômica da família Rajidae no Brasil (Chondrichthyes, Elasmobranchii, Rajiformes)
… diet are crustaceans, polichetes, nematoids, cephalopods and teleost f ishes. Distribution data has revealed that the rajids from the slope presents a great distribution range. The mouth of the main rivers, acting directly abiotic factors, presented important influence in rajid distribution. …
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Nico's bubbles : the story of a whale, some crows, and the search for sentience
… in a vast array of nonhuman species, from cephalopods to primates. In this particular search, science has been increasingly successful as researchers report that New Caledonian crows can use tools to solve rather complex problems; that dolphins and songbirds can identify themselves in …
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Hydrodynamic and structural constraints on ammonoid shell shape
… been thought that the the shells of chambered cephalopods served as buoyancy compensation devices. However, it was not until the 1960's that the internal pressure of the shell was demonstrated to be less than one atmosphere, and that the shell structure supports hydrostatic load. It is …
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Paleozoology of cores from the Tyler Formation (Pennsylvanian) in North Dakota, U.S.A.
… 15 brachiopods, 14 bivalves, 2 gastropods, 2 cephalopods, 2 annelids, 2 branchiopoda, at least 2 ostracodes, 2 malacostracans, 1 insect, and 1 echinoderm. Chordates include 1 "nonmarine" shark, at least 1 paleoniscoid fish, and 1 possible crossopterygian fish. A new genus and species of …
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Molecular and morphological factors contributing to the resolution of the taxonomy of Octopus vulgaris Type III
… background to the cryptic species problem within cephalopods and discusses the significance of resolving the taxonomy of O. vulgaris Type III. Chapters 2 and 3 sequence and annotate the first complete mitochondrial genomes (mitogenomes) of O. vulgaris ss and O. vulgaris Type III respectively. …
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Dispersion of seabirds at sea in the Southern Ocean
… (penguins excluded). Birds eating plankton and cephalopods are the most abundant; few birds eat fish. Plankton- and cephalopod-eaters occur most abundantly in the south and north of the study area, respectively. An association between their distribution and the availability of their principal …
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A computational approach to the quantification of animal camouflage
… camouflage strategies in the animal kingdom. Cephalopods like cuttlefish and octopus mastered a rather unique skill: they can rapidly adapt the way their skin looks in color, texture and pattern, blending in with their backgrounds. Showing a general resemblance to a visual background is one of …
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A computational approach to the quantification of animal camouflage
… camouflage strategies in the animal kingdom. Cephalopods like cuttlefish and octopus mastered a rather unique skill: they can rapidly adapt the way their skin looks in color, texture and pattern, blending in with their backgrounds. Showing a general resemblance to a visual background is one of …
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