Relevant bibliographies by topics / Loligo gahi

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  2. Dissertations / Theses

Academic literature on the topic 'Loligo gahi'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Loligo gahi"

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Brierley, Andrew S., and John P. Thorpe. "Biochemical genetic evidence supporting the taxonomic separation of Loligo gahi from the genus Loligo." Antarctic Science 6, no. 2 (June 1994): 143–48. http://dx.doi.org/10.1017/s0954102094000222.

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Fifteen specimens of Loligo gahi caught within the Falkland Islands Interim Conservation and Management Zone during March 1988 were subject to genetic analysis using horizontal starch gel electrophoresis. Comparison of allele frequencies at 22 clearly resolving putative enzyme loci showed these animals to exhibit a degree of genetic differentiation from samples of Loligo forbesi and Loligo vulgaris vulgaris (I = 0.19 and 0.22 respectively) greater than that normally expected between congeneric species. The degree of difference was of the order typically exhibited between members of different but confamilial genera, for example as here between Loligo forbesi and Alloteuthis subulata (I = 0.22). It is therefore concluded that Loligo gahi should no longer be regarded as a member of the genus Loligo. Genetic analysis of further species is necessary to clarify whether or not Loligo gahi should, as has been suggested on morphological grounds, be united in a separate genus with other American myopsid species also currently ascribed to the genus Loligo.
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Arkhipkin, Alexander. "Statolith Microstructure and Maximum age of Loligo Gahi (Myopsida: Loliginidae) on the Patagonian Shelf." Journal of the Marine Biological Association of the United Kingdom 73, no. 4 (November 1993): 979–82. http://dx.doi.org/10.1017/s0025315400034871.

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Statoliths of Loligo gahi were sampled in the fishery region 45–47°S on the Patagonian shelf during September 1989. Peculiarities of the growth zones in the ground statoliths of adults are described. Maximum age of large maturing and mature females (130–160 mm of mantle length, ML) was estimated to be 325–345 d, that of large mature males (250–290 mm ML) ranged from 360 to 396 d.The squid Loligo gahi d'Orbigny, 1835, occurs in temperate shelf and upper slope waters of the Atlantic and Pacific coasts of South America and is caught commercially by the international fleet in the southern part of the Patagonian shelf within the Falkland Islands Interim Conservation Zone (FICZ) (Roper et al., 1984; Csirke, 1987). Occasionally, dense shoals of L. gahi appear in the fishery region 45–47°S off the Exclusive Economic Zone of Argentina (EEZA) and have been caught in significant numbers by trawlers at depths of 120–150 m in September-October (Chesheva, 1990). Loligo gahi is a medium sized loliginid; in Falkland waters males attain 350 mm ML, females 210 mm ML (Hatfield, 1991), while in the fishery region 45–47°S maximum size is 260 mm and 160 mm, respectively (Chesheva, 1990). Patterson (1988) revealed two Falkland spawning stocks of L. gahi of unclear status, spring-spawners and autumn-spawners (austral seasons) and pointed out that the life span of squid of each stock lasted ~1 y. Recently Hatfield (1991) used statoliths to elucidate Patterson's (1988) estimations of age and growth of Falkland stocks of L. gahi and confirmed the 1-y duration of L. gahi's life span.
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3

Rasero, M., and J. M. Portela. "Relationships Between Mating and Sexual Maturation of Loligo Gahi Females in Falkland Waters." Journal of the Marine Biological Association of the United Kingdom 78, no. 2 (May 1998): 673–76. http://dx.doi.org/10.1017/s0025315400041734.

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Observations on samples from Spanish trawlers between September and November of 1995 revealed the presence of mated females of Loligo gahi (Cephalopoda: Loliginidae) from 164–285 m depth, in the Western area of the Falkland Islands Conservation Zone. 93.8% of the mature females, and 31.0% of the maturing ones, were mated. Deposition of spermatophores always took place in the oral membrane between the connectives of arms IV. The relationships between sexual maturation and copulation have been analysed, and the hypothesis of mating acting as a ‘trigger’ of the final sexual maturation in Loligo gahi females is proposed and discussed.
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Barón, Pedro J., and María E. Ré. "Morphometry of the northern Patagonian sympatric populations of Loligo sanpaulensis and Loligo gahi." Journal of the Marine Biological Association of the United Kingdom 82, no. 2 (April 2002): 269–78. http://dx.doi.org/10.1017/s0025315402005453.

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Loligo gahi and Loligo sanpaulensis (Mollusca: Cephalopoda), two squid species presently under exploitation in the south-west Atlantic, are sympatric in coastal waters of northern Patagonia. In the present study, the morphometry of both species' northern Patagonian populations was analysed and compared. Relationships between the morphometric variables and mantle length, the standard measure of size for squids, are allometric in most cases. Weight and fin length show different rates of growth relative to mantle length in males and females of both species. Fin length, fin width and mantle length are the best morphometric variables to discriminate the mantle/fin complexes. Free rachis length, gladius length and gladius width are the most useful to separate both species' pens. The best discrimination of the tentacles is provided by the diameter of the central and marginal suckers and the number of teeth on the three largest sucker rings. Discriminant functions are provided to allow the classification of individuals from both species and the identification of pens and tentacle clubs found in predators digestive contents.
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Baron, P. J. "The paralarvae of two South American sympatric squid: Loligo gahi and Loligo sanpaulensis." Journal of Plankton Research 25, no. 11 (November 1, 2003): 1347–58. http://dx.doi.org/10.1093/plankt/fbg093.

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6

George, Magnus J. A., and Emma M. C. Hatfield. "First Records of Mated Female Loligo Gahi (Cephalopoda: Loliginidae) in the Falkland Islands." Journal of the Marine Biological Association of the United Kingdom 75, no. 3 (August 1995): 743–45. http://dx.doi.org/10.1017/s0025315400039151.

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This communication presents the first records of mated female Loligo gahi in Falkland Island waters. In October 1993 fully mature mated female L. gahi were identified in samples taken from the commercial fishery in waters east of Lively Island, East Falkland, at depths of 145–174 m. Spermatophores were found in both the mantle cavity and buccal sites of deposition. These records, combined with past records of spent females, suggest spawning periods in late October/early November and April/May. These concur with two of the three periods of spawning suggested from previous studies of juvenile and adult L. gahi.
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7

Guerra, Angel, and Bernardino G. Castro. "Reproductive-somatic relationships in Loligo gahi (Cephalopoda: Loliginidae) from the Falkland Islands." Antarctic Science 6, no. 2 (June 1994): 175–78. http://dx.doi.org/10.1017/s0954102094000271.

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Samples of Loligo gahi from the Falkland Islands Interim Conservation and Management Zone collected in March 1987 were analysed to determine the relationships between mass of reproductive and somatic organs during maturation. There was a progressive increase in mass of the reproductive organs with growth in males, while in females these organs did not show a conspicuous increase in mass until a body mass of c. 40 g was reached. No change was found in the mass of the digestive gland in relation to body mass or in the water content of male and female somatic tissues during maturation. Growth of reproductive organs in L. gahi seems to be supported by diet and not at the expense of somatic tissue.
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8

Agnew, D. J., R. Baranowski, J. R. Beddington, S. des Clers, and C. P. Nolan. "Approaches to assessing stocks of Loligo gahi around the Falkland Islands." Fisheries Research 35, no. 3 (May 1998): 155–69. http://dx.doi.org/10.1016/s0165-7836(98)00083-6.

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9

Shaw, P. W., and G. J. Adcock. "Polymorphic microsatellite DNA markers for the Patagonian squid, Loligo gahi (Cephalopoda)." Molecular Ecology Notes 2, no. 3 (September 2002): 331–33. http://dx.doi.org/10.1046/j.1471-8286.2002.00235.x.

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10

Hatfield, E. M. C., and P. G. Rodhouse. "Distribution and abundance of juvenile Loligo gahi in Falkland Island waters." Marine Biology 121, no. 2 (December 1994): 267–72. http://dx.doi.org/10.1007/bf00346735.

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Dissertations / Theses on the topic "Loligo gahi"

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Dávila, Robles Miguel Germán. "Aspectos histológicos de la Gónada del Loligo Gahi ¨CALAMAR¨ (cephalopoda: loliginidae) procedente del litoral de Chorrillos." Bachelor's thesis, Universidad Ricardo Palma, 2009. http://cybertesis.urp.edu.pe/handle/urp/803.

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En el presente trabajo se evalúa la estructura histológica de las gónadas del calamar Loligo gahi como también su comportamiento reproductivo en determinados meses. De Enero a Marzo de 2007 se realizaron muestreos mensuales de 56 ejemplares de calamar Loligo gahi del muelle de la playa Pescadores de la costa de Lima, Perú. Fueron procesadas por técnica histológica convencional de hematoxilina–eosina para poder determinar las etapas de la ovogénesis, espermiogénesis y describir la organización histológica del ovario y del testículo. En las hembras de Loligo gahi la ovogénesis presenta 6 etapas o fases de desarrollo. En el macho la espermiogénesis constó de 5 etapas de desarrollo, lo que facilitará predecir adecuadamente el ciclo reproductivo. El análisis histológico se complementó con la obtención del índice gonadosomático, cuyos resultados permiten predecir que los meses de enero a marzo son los más adecuados para la maduración sexual y el desove en esta especie. The present work evaluates the histological structure of gonads of the squid Loligo gahi as well as their behavior in certain months. From January to March 2007 were conducted monthly sampling of 56 specimens of the squid Loligo gahi Beach pier fishermen along the coast of Lima, Peru. Were processed by conventional histological technique of hematoxylin-eosin to determine the stages of ovogénesis, espermiogénesis and describe the histological organization of the ovary and testis. In females of Loligo gahi 6 presents the ovogénesis phases or stages of development. In the male espermiogénesis consisted of 5 stages of development, which provide adequately predict the reproductive cycle. The histological analysis was supplemented by obtaining Gonadosomatic The results predict that the months of January through March are the most suitable for sexual maturation and spawning in this species
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Hatfield, Emma Maria Claire. "Recruitment, demography and growth of the Patagonian squid Loligo gahi (D'Orbigny, 1835) in Falkland Island waters." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315332.

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3

Auzanneau, Jérôme. "Etudes d’association dans des variétés synthétiques : Cas du gène GAI et de la croissance foliaire chez le ray-grass anglais." Rennes, Agrocampus, 2007. http://www.theses.fr/2007NSARC091.

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L’identification des gènes ou des régions du génome responsables de la variabilité des caractères quantitatifs est généralement réalisées à partir de populations de cartographie dérivées d’hybrides F1. Cependant, ces populations sont peu variables et parfois difficiles à obtenir. Une autre approche possible est la conduite d’études d’association à l’aide de collections d’individus, construites pour représenter une grande variabilité. Cependant, ces collections sont souvent structurées, ce qui peut induire la détection de « fausses » associations entre marqueurs et caractères. Ainsi, un matériel végétal idéal pour des études d’association serait des populations multi alléliques et non structurées. C’est le cas des variétés fourragères qui sont des variétés synthétiques, obtenues après plusieurs générations successives de panmixie, à partir d’un n ombre plus ou moins grand d’individus. L’objectif de cette thèse est de tester si les variétés synthétiques peuvent être utilisées pour identifier les gènes ou les régions du génome responsables de la variabilité des caractères quantitatifs dar des études d’association
Identification of genes or of genome regions which explain variationin quantitative traits is generally obtained from QTL analyses using F1 hybrids derived populations. However, these population exhibit a low variability and are sometimes difficult to obtain. An alternative would be association studies using collections of individuals, built to be highly variable. Howevre, these collections are often structured which could lead to detection of spurious associations between markers and traits. So, an ideal plant material for association studies would be multi-allelic and unstructured populations. It is the case of perennial forage varieties which are synthetics, obtained after several panmictic multiplication generations, from a variable number of parents. The objective of this thesis was to test whether synthetic varieties could be used for association studies to identify genes or genome regions responsible for variation in quantitative traits
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