Добірка наукової літератури з теми "Spineurs de Cauchy"
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Статті в журналах з теми "Spineurs de Cauchy":
1
Pohle, Gerhard W. "Larval development of Canadian Atlantic oregoniid crabs (Brachyura: Majidae), with emphasis on Hyas coarctatus alutaceus Brandt, 1851, and a comparison with Atlantic and Pacific conspecifics." Canadian Journal of Zoology 69, no. 11 (November 1, 1991): 2717–37. http://dx.doi.org/10.1139/z91-384.
Анотація:
Larval development of Hyas coarctatus alutaceus Brandt, 1851, consisting of two zoeal stages followed by a megalopa, is described for the first time from larvae of known parentage. Mean duration of the first and second zoeal stages was 41 and 30 days at ambient temperature (3–12 °C) and 30 and 36 days at 9 °C, respectively. First megalopae appeared after 69 and 62 days post-hatching at ambient temperature and 9 °C, respectively. For comparison, all larval stages of Hyas araneus, Hyas coarctatus coarctatus, and Chionoecetes opilio were also cultured from local populations. Zoeae of all these species were found to be very similar. Larvae of H. c. alutaceus were significantly larger than those of H. c. coarctatus, surpassing even those of H. araneus. Laboratory-reared and wild-caught larvae from different geographic areas were also compared. Characters potentially useful in the interspecific and subspecific differentiation of zoeae are presented. These include (i) relative dimensions of the carapace, spinules on carapace spines, setae on antennal exopodites, lateral abdominal spines relative to abdominal somites, spines on the telson furca, and dorsolateral spines on abdominal somite 3; (ii) presence or absence of spinules on lateral abdominal spines and knobs on eyestalks; (iii) setation of appendages; and (iv) pigmentation. Megalopae are also compared morphometrically and meristically. Larvae vary more than appeared previously. A key for the identification of larval stages of C. opilio and Hyas spp. is provided.
2
BÉAREZ, PHILIPPE, and HIROYUKI MOTOMURA. "Description of a new scorpionfish (Scorpaenoidei, Sebastolobinae) from the tropical eastern Pacific." Zootaxa 2277, no. 1 (October 30, 2009): 61–68. http://dx.doi.org/10.11646/zootaxa.2277.1.5.
Анотація:
A new spiny scorpionfish, Trachyscorpia verai, is described from a single specimen caught by deepwater longline off Puerto López (Ecuador, Tropical Eastern Pacific). This scorpionfish is distinguished from all other species of Trachyscorpia by a unique combination of characters: dorsal-fin spines 12, vertebrae 26, and gas bladder absent. Other diagnostic characters are: maxilla unscaled, third dorsal spine long, and pelvic spine short. This is the second species of Trachyscorpia known from the TEP and the sixth worldwide.
3
AL-AIDAROOS, ALI M., A. A. J. KUMAR, AHMED E. AL-HAJ, ABDULMOHSIN AL-SOFYANI, MICHAEL P. CROSBY, and MOHSEN M. EL-SHERBINY. "Morphology of the complete larval stages of Portunus segnis (Forskål, 1775) (Crustacea: Brachyura: Portunidae) from the Gulf of Aqaba, Saudi Arabia." Zootaxa 4638, no. 2 (July 16, 2019): 199–218. http://dx.doi.org/10.11646/zootaxa.4638.2.2.
Анотація:
Portunus pelagicus (Linnaeus, 1758) sensu lato has been recognized as a species complex comprising four species. Of these four species, the larval stages of all except Portunus segnis (Forskål, 1775), have been described. The larvae of P. segnis, hatched from an ovigerous female, caught in the Gulf of Aqaba, were cultured in the laboratory up to the megalopa stage. All the larval stages are described herein for the first time. The number of aesthetascs of the antennules of all the zoeal stages of P. segnis differs from those of the larvae of the other species of the P. pelagicus species complex. In the telson forks of zoea I–IV of P. segnis, there is a pair of ventral spines and two pairs of dorsal spines, whereas in the other P. pelagicus species complex larvae, there is a pair each of ventral and dorsal spines. Another unique feature, in the megalopa of P. segnis, are two endopod hooks in pleonites I–V. Different zoeal and megalopal stages of P. segnis can be distinguished clearly from the other P. pelagicus species complex larvae based on the number of setae and patterns of different appendages.
4
BYRKJEDAL, INGVAR, and ALEXEI M. ORLOV. "A new species of Cottunculus (Teleostei: Psychrolutidae) from the Mid Atlantic Ridge." Zootaxa 1580, no. 1 (September 10, 2007): 63–68. http://dx.doi.org/10.11646/zootaxa.1580.1.5.
Анотація:
Cottunculus tubulosus n.sp. is described from one specimen caught in the summer of 2004 in the Northeast Atlantic, at about 2000 m depth in the Mid Atlantic Ridge. The species is characterised by a slender body, a long head, large pointed cranial spines, large bony tubules along the lateral line, prominent dermal prickles along the back, dorsal and anal fins set far posterior, a short caudal peduncle, and no banded colour patterns. From morphological characters, the species seems closely related to the South African species C. spinosus.
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Akther, M., A. Alam, J. D'Silva, A. I. Bhuiyan, G. A. Bristow, and B. Berland. "Goezia bangladeshi n. sp. (Nematoda: Anisakidae) from an anadromous fish Tenualosa ilisha (Clupeidae)." Journal of Helminthology 78, no. 2 (June 2004): 105–13. http://dx.doi.org/10.1079/joh2003219.
Анотація:
AbstractA total of 1432 hilsa shad, Tenualosa ilisha (=Hilsa ilisha) from 11 fresh water, brackish water and marine localities in Bangladesh yielded 13 adult Goezia bangladeshi n. sp., all specimens being found in the intestine of a single fish host caught in the lower Ganges. A total of 2372 Goezia juveniles were recovered from 490 infected fish (prevalence 34.2%). This is the first Goezia species recorded from Bangladesh, and it differs from other valid species by the number of caudal papillae (pre 7–9, para 3, post 6); encircled by tiny spines, the position of double papillae, the arrangement of body spines, and the length ratio of the intestinal caecum and the ventricular appendix (1: 3.33–4.72). Juveniles were free in the gut, embedded in the gut wall and encapsulated in mesenteries. Tenualosa ilisha serves as the definitive host, but the predominance of juveniles may indicate that piscivorous hosts may also serve as such. A list of the nominal Goezia species with important characters is provided.
6
Garrone Neto, Domingos, and Virgínia Sanches Uieda. "Ingestion of catfish by freshwater stingray: possible mistake or inexperience." Biota Neotropica 9, no. 4 (December 2009): 265–67. http://dx.doi.org/10.1590/s1676-06032009000400029.
Анотація:
We report an individual of the freshwater stingray Potamotrygon falkneri caught with a decomposing catfish, Pimelodella gracilis, stuck in its oral cavity. The ingestion of catfishes by stingrays is possibly rendered difficult or hazardous due to the serrated spines on the dorsal and pectoral fins of this prey type. There are at least two possible explanations for the rotting catfish we found stuck in the mouth of a potamotrygonid ray: mistake or inexperience of the analyzed specimen. Both possibilities may be due to the fact that the ray was a young individual.
7
Aprianti Lestari, Tia, Murwantoko Murwantoko, and Eko Setyobudi. "Morphological and molecular identification of hairtail (Trichiurus spp.) caught in Pangandaran Waters." E3S Web of Conferences 147 (2020): 02021. http://dx.doi.org/10.1051/e3sconf/202014702021.
Анотація:
This study aimed to identify the species of hairtail caught in Pengandaran waters based on morphological, meristic character and molecular approach. In total 135 fish samples were collected from Pangandaran Waters, during March-April 2017. Each sample was identified, measured on 22 morphometric and 4 meristic characters, then analyzed using Principal Component Analysis (PCA). Molecular identification was conducted by sequenced of 16S rRNA gene. The result of the research showed that hairtail characterized by III spines and 125-140 soft rays of dorsal fin (D.III, 125-140), the anal fin situated below 38th to 41th of dorsal-fin soft ray, I spine and 10 soft rays of pectoral fin (P.I.10), and I spine and 91 to 112 spinules of anal fin (A.I.91-112). Based on the morphological identification, the hairtail was belonged to Trichiurus lepturus. Principal Component Analysis showing the morphometric variation was presented in the caudal peduncle length. Molecular analysis of mitochondrial DNA of the partial 16S rRNA gene confirmed the hairtail as T. lepturus with similarity 98-99% based on previously published data. Phylogenetic analysis showed that T. lepturus from Pangandaran were closely similar to related species caught from the Southern Coast of Yogyakarta Special Territory (Indian Ocean) and Hainan China (Pacific Ocean).
8
Miskiewicz, Anthony G., Francisco J. Neira, and Sharon E. Tait. "Development and ecology of larvae of the monotypic Australian fish family Dinolestidae." Australian Journal of Zoology 47, no. 1 (1999): 37. http://dx.doi.org/10.1071/zo98068.
Анотація:
The development and seasonal distribution of larvae of Dinolestes lewini, the sole species of the endemic Australian family Dinolestidae, are described for the first time using larvae 1.88–14.13 mm in body length caught in south-eastern Australia. Larvae have a moderately deep body, 27–29 myomeres, a moderate to large head, a large mouth with prominent, early-forming premaxillary teeth, small to moderate preopercular spines, a coiled and compact gut, and are moderately pigmented. Notochord flexion takes place between 4.8 and 7.0 mm and transformation at a size >14 mm. Larvae closely resemble those of Apogonops (Acropomatidae), Pomatomus (Pomatomidae) and Scomber (Scombridae), genera that have been postulated to be related to Dinolestes, but can be distinguished using a combination of myomere and fin-ray counts, and pigmentation. Larvae have been caught in marine waters off central New South Wales between January and November, and off western Victoria in late January, at depths between 30 and 0 m and within 8 nautical miles of the coast. The limited data on larval occurrence in New South Wales indicate that D. lewini spawns over an extended period, with a peak in autumn/winter.
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Katandukila, Jestina V., and Nigel C. Bennett. "Pattern of ovulation in the East African root rat (Tachyoryctes splendens) from Tanzania: induced or spontaneous ovulator?" Canadian Journal of Zoology 94, no. 5 (May 2016): 345–51. http://dx.doi.org/10.1139/cjz-2015-0217.
Анотація:
The East African root rat (Tachyoryctes splendens (Rüppell, 1835)) is a solitary subterranean rodent that exhibits a marked seasonal reproduction linked to the bimodal rainfall pattern of East Africa. The current study sets out to determine whether the East African root rat is an induced or spontaneous ovulator. Five wild caught adult females were monitored noninvasively for ovarian cyclicity by measuring urinary progesterone every 2 days over a period of 120 days. Females were subjected to three different experimental treatments, namely, initially singly housed or control (C), nonphysical contact with a male (NPC), and physical contact with a vasectomised male (PC), respectively. The concentration of urinary progesterone was higher during PC than during either NPC or C. The act of coitus appears to be necessary for ovulation to occur in the females. The male East African root rats were found to possess epidermal spines on the penis that can be used to bring about cervical stimulation during coitus. The spines result in the induction of ovulation as has been proposed for other solitary subterranean rodents. The findings from the female progesterone profiles and the assessment of penile morphology suggest that the female East African root rat is an induced ovulator stimulated by penile intromission during coitus.
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THATCHER, Vernon E. "Anphira branchialis GEN. ET SP. NOV. (CRUSTACEA, ISOPODA, CYMOTHOIDAE) A GILL CAVITY PARASITE OF PIRANHAS (Serrasalmus SPP.) IN THE BRAZILIAN AMAZON." Acta Amazonica 23, no. 2-3 (1993): 297–307. http://dx.doi.org/10.1590/1809-43921993233307.
Анотація:
Anphira branchialisgen. et sp. nov. (Crustacea, Isopoda, Cymothoidae) is described from the dorsal areas of the gill chambers of three species of piranhas (Serrasalmusspp.). The fishes were caught in rivers near Manaus, Amazonas State and on Maracá island, Federal Territory of Roraima, Brasil. The new genus and species is characterized by having large, flat coxal plates on ail 7 pereonites. These plates usually extend beyond the margins of the following segments and the 7th ones extend nearly to the pleotelson and cover the lateral margins of the pleonites. The mandible of this species is rounded, "foot shaped" and without incisor. The mandibular palp is short and stout. The maxillules have 3 terminal and 2 subterminal spines. The pleopods are simple lamellar structures with rounded tips. Evidence is presented that these parasites feed on gill filaments.
Дисертації з теми "Spineurs de Cauchy":
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Flamencourt, Brice. "On some problems in spectral analysis, spin geometry and conformal geometry." Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPASM014.
Анотація:
Cette thèse se divise en deux grandes parties. Dans la première, on s'intéresse à deux problèmes d'analyse spectrale portant sur la convergence des valeurs propres d'opérateurs à paramètres. D'une part, on considère l'opérateur de Schrödinger dans le plan, avec un potentiel singulier supporté par une courbe fermée Γ admettant un point de rebroussement. Ce potentiel s'écrit formellement −αδ(x−Γ), et l'on décrit le comportement du spectre de l'opérateur dans la limite α→∞. D'autre part, on étudie l'opérateur de Dirac qui apparaît dans le modèle MIT Bag, en le généralisant aux variétés spin. Lorsque le paramètre de masse de cet opérateur tend vers l'infini, on observe une convergence des valeurs propres. Dans la seconde partie, on discute différents problèmes de géométrie. On démontre tout d'abord des résultats de structure et de classification en dimension 3 pour une classe particulière de spineurs, appelés spineurs de Cauchy, qui apparaissent naturellement comme restrictions de spineurs parallèles à des hypersurfaces orientées de variétés spin. Enfin, on s'intéresse aux connexions de Weyl sur les variétés conformes. On définit les structures localement conformément produits (LCP) par la donnée d'une structure de Weyl fermée, non-exacte, non-plate et à holonomie réductible sur une variété conforme compacte. On analyse les variétés LCP afin d'initier une classificationThis thesis is divided into two main parts. In the first one, we focus on two problems of spectral analysis concerning the convergence of eigenvalues of operators with parameters. On the one hand, we consider the Schrödinger operator in the plane, with a singular potential supported by a closed curve Γ admitting a cusp. This potential is formally written −αδ(x−Γ), and we describe the behaviour of the spectrum of the operator as α→∞. On the other hand, we study the Dirac operator which appears in the MIT Bag model, by generalizing it from Euclidean spaces to spin manifolds. We observe a convergence of the eigenvalues of this operator when the mass parameter tends to infinity. In the second part, we discuss two different geometric problems. First, we prove structure and classification results in dimension 3 for a particular class of spinors, called Cauchy spinors, arising as restrictions of parallel spinors to oriented hypersurfaces of spin manifolds. Finally, we focus on Weyl connections on conformal manifolds. We define a locally conformally product (LCP) structure as a closed, non-exact, non-flat Weyl structure with reducible holonomy on a compact conformal manifold. We analyse the LCP manifolds in order to initiate a classification
Частини книг з теми "Spineurs de Cauchy":
1
"Biology and Management of Dogfish Sharks." In Biology and Management of Dogfish Sharks, edited by Susan D. Hazlett, Nicole Misarti, Alexander G. Andrews, Gordon A. McFarlane, and Matthew J. Wooller. American Fisheries Society, 2009. http://dx.doi.org/10.47886/9781934874073.ch23.
Анотація:
Abstract.—Spiny dogfish <em>Squalus acanthias </em>are an abundant and commercially important species of fish off both the Atlantic and Pacific coasts of North America. They are opportunistic feeders and have a varied diet that can include many fish species, especially small forage fish such as herring, capelin, and sand lance as well as crustaceans, worms, euphausiids, gelatinous zooplankton, and cephalopods. The purpose of our present study is to investigate the utility of the second dorsal spine in providing multiyear information on the feeding habits of dogfish using stable isotope (C and N) analysis. The outer dentine and enamel layers of a spine from three dogfish (caught off the coast of British Columbia) were analyzed to obtain their stable nitrogen and carbon isotope composition (δ<sup>15</sup>N and δ<sup>13</sup>C, respectively). Each sample had annuli from multiple years, allowing possible seasonal migrations to be averaged over samples. The δ<sup>15</sup>N ranged from a low of 11.6‰ to a high of 14.9‰ over the three spines and δ<sup>13</sup>C ranged from –11.5‰ to –18.4‰. The variable isotopic signatures along the spine indicate that the method may be used to assess ecological changes. Stable isotope measurements of dogfish spines could be a valuable means of determining long-term changes in habitat usage and feeding ecology.