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  • 1
    Electronic Resource
    Electronic Resource
    Modulation of taurine uptake in the goldfish retina and axonal transport to the tectum¶Effect of crushing the optic nerve or axotomy (2000)
    Springer
    Amino acids 19 (2000), S. 687-703 
    Details
    ISSN: 1438-2199
    Keywords: Keywords: Amino acids – Optic nerve – Retina – Taurine – Taurine axonal transport – Taurine uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary. Although there are a great number of studies concerning the uptake of taurine in several tissues, the regulation of taurine transport has not been studied in the retina after lesioning the optic nerve. In the present study, isolated retinal cells of the goldfish retina were used either immediatly after cell suspension or in culture. The high-affinity transport system of [3H]taurine in these cells was sodium-, temperature- and energy-dependent, and was inhibited by hypotaurine and β-alanine, but not by γ-aminobutyric acid. There was a decrease in the maximal velocity (Vmax) without modifications in the substrate affinity (Km) after optic axotomy. These changes were mantained for up to 15 days after the lesion. The results might be the summation of mechanisms for providing extracellular taurine to be taken up by other retinal cells or eye structures, or regulation by the substrate taurine, which increases after lesioning the optic nerve. The in vivo accumulation of [3H]taurine in the retina after intraocular injection of [3H]taurine was affected by crushing the optic nerve or by axotomy. A progressive retinal decrease in taurine transport was observed after crushing the optic nerve, starting at 7 hours after surgery on the nerve. The uptake of [3H]taurine by the tectum was compensated in the animals that were subjected to crushing of the optic nerve, since the concentration of [3H]taurine was only different from the control value 24 hours after the lesion, indicating an efficient transport by the remaining axons. On the contrary, the low levels of [3H]taurine in the tectum after axotomy might be an index of the non-axonal origin of taurine in the tectum. Axonal transport was illustrated by the differential presence of [3H]taurine in the intact or crushed optic nerve. The uptake of [3H]taurine into retinal cells in culture in the absence or in the presence of taurine might indicate the existence of an adaptive regulation of taurine transport in this tissue, however taurine transport probably differentially occurs in specific populations of retinal cells. The use of a purified preparation of cells might be useful for future studies on the modulation of taurine transport by taurine in the retina and its role during regeneration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007260070016
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Attractiveness of tobacco budworm females altered by oral chemosterilants and dietary additives (1977)
    Springer
    Journal of chemical ecology 3 (1977), S. 127-131 
    Details
    ISSN: 1573-1561
    Keywords: Sex pheromone production ; Heliothis virescens (F.) ; attractiveness ; chemosterilants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract FemaleHeliothis virescens (F.) moths reared from larvae on diet treated (0.1%) with experimental chemosterilants or the dietary additive, DL-leucine, were used as bait in sex lure traps in field cages when they were 2–4 nights old. Catches of untreated released males were used to determine relative attractiveness of the chemically treated females. The catch (indicating quantity or production frequency of pheromone) was significantly increased whendl-leucine had been fed in the larval diet, and sulfanilamide caused a slight increase in female attractiveness. The catch of males was significantly reduced when either reserpine or quercitin had been added to the diet. The other chemicals, bisdicumarol, 2,4-dichlorophenoxyacetic acid, β-sitosterol, and dihydrocholesterol, did not significantly affect the catch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994139
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  • 3
    Electronic Resource
    Electronic Resource
    Aggregata sagittata n. sp. (Apicomplexa: Aggregatidae), a coccidian parasite from the European flying squid Todarodes sagittatus (Mollusca: Cephalopoda) (2000)
    Springer
    Systematic parasitology 47 (2000), S. 203-206 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A new species of the coccidian genus Aggregata Frenzel, 1885 (Apicomplexa, Aggregatidae) is described from the digestive tract of Todarodes sagittatus (Lamarck), an ommastrephid squid that lives in temperate waters in the northeastern Atlantic Ocean. Using light microscopy, oöcysts were 225–333 μm in length and 220–323 μm in width. Each oöcyst contained 600–1,000 sporocysts. Sporocysts were 16–18 μm in length and 15–17μm in width, with a smooth surface and thick wall. Each sporocyst contained 4–8 sporozoites each with a length of 11–13 μm. This paper presents the description of a new Aggregata species in a nerito-oceanic flying squid. Moreover, it extends the distribution of Aggregata to oceanic cephalopod host species. A. sagittata represents the third named species in the genus Aggregata in European waters and the seventh worldwide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006400619047
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  • 4
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    Age studies based on daily growth increments in statoliths and growth lamellae in cuttlebone of cultured Sepia officinalis (2001)
    Springer
    In:  Marine Biology, 139 (2). pp. 327-334.
    Details
    Publication Date: 2021-06-29
    Description: One hundred and six individuals of Sepia officinalis were cultured throughout its life cycle in two different temperature regimes: 13–15°C and 18–20°C. The number of increments in the statoliths and the number of lamellae in the cuttlebone were read at known ages in different individuals. The formation of growth increments in the statoliths was linearly related with individual age, but it was independent of temperature. By comparison between the slope of these linear relationships and the bisecting line, the hypothesis "1 increment=1 day" was validated in individuals as old as 240 days. In specimens older than 240 days, the number of increments was underestimated due to the poor resolution of the later growth increments. The maximum number of days in captivity (420) was about 80% of the life span estimated for this species in the area studied. Preliminary validation was also obtained from statoliths marked with tetracycline. Increments between tetracycline marks were not visible. The mean distance between marks in ten statoliths was 44 µm (±6). Considering the same distance in statoliths of wild individuals, the mean number of increments counted was 37 (±6). This result is very close to the 40 days passed between both tetracycline marks. A straight line significantly different for each culture temperature defined the relationship between number of the cuttlebone lamellae and age. The number of lamellae in the cuttlebone does not correspond to the real age. The time necessary for the formation of one lamella was 8±2.3 days at 13–15°C, whereas the deposition of one lamella lasted 3.1±1.06 days at 18–20°C. In conclusion, the periodicity for lamellar deposition can be defined only if the temperature where the animal lived is considered.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s002270100582
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  • 5
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    Planktonic egg masses of the diamond-shaped squid Thysanoteuthis rhombus in the eastern Atlantic and the Mediterranean Sea (2002)
    Oxford University Press
    In:  Journal of Plankton Research, 24 (4). pp. 333-338.
    Details
    Publication Date: 2021-07-02
    Description: Eight planktonic egg masses of the diamond-shaped Thysanoteuthis rhombus observed from 1995 to 2000 are described. Four were found in the western Mediterranean and the others were found off the Canary Islands. The egg masses from the Canary Islands are the first records for the eastern Atlantic. All were found near the surface at the end of summer and the beginning of autumn. The planktonic egg masses were dense, resilient oblong cylinders with rounded tips ranging from 80 to 130 cm in length and between 15 and 20 cm in diameter. Egg capsule dimensions ranged from 2.8 to 3.4 mm and total length of the newly hatched paralarvae was between 2.5 and 2.8 mm. Each egg mass contained an estimated 24 100–43 800 eggs. Some new characters that should help identification of the paralarvae, such as arm formulae, presence of an incipient keel-shaped membrane on some arms, and the type and chromatophore pattern are given. Ecological factors influencing the presence and distribution of these egg masses are discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/24.4.333
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  • 6
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    Feeding ecology of Cuvier's beaked whale ( Ziphius cavirostris ): a review with new information on the diet of this species (2001)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 81 (4). pp. 687-694.
    Details
    Publication Date: 2021-07-01
    Description: Published information on the diet of Cuvier's beaked whales Ziphius cavirostris (Odontoceti: Ziphiidae) is reviewed and new information on the stomach contents of three animals: two stranded in Galicia (north-west Spain) in February 1990 at A Lanzada, and in February 1995 at Portonovo; and the third stranded in February 1999 in North Uist (Scotland), is presented. The whale stranded in 1990 was a male; the other two were adult females. All animals were 〉5 m long. The limited published information on the diet of this species indicates that it feeds primarily on oceanic cephalopods although some authors also found remains of oceanic fish and crustaceans. Food remains from the three new samples consisted entirely of cephalopod beaks. The Scottish sample set is the largest recorded to date for this species. The prey identified consisted of oceanic cephalopods, mainly squid (Cephalopoda: Teuthoidea). The most frequently occurring species were the squid Teuthowenia megalops , Mastigoteuthis schmidti and Taonius pavo (for the Galician whale stranded in 1990), Teuthowenia megalops and Histioteuthis reversa (for the second Galician whale) and T. megalops , Gonatus sp. and Taonius pavo (for the Scottish whale). Other prey included the squid Histioteuthis bonnellii , Histioteuthis arcturi and Todarodes sagittatus as well as Vampiroteuthis infernalis (Cephalopoda: Vampyromorpha), Stauroteuthis syrtensis and Japetella diaphana (Cephalopoda: Octopoda). The squid eaten (estimated from the measurement of the lower beaks) included juvenile and mature individuals of the most important species ( Teuthowenia megalops , Gonatus sp.). The range of species found in the diet of Z. cavirostris is greater than that reported for sperm whales and bottlenosed whales in the north-east Atlantic.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1017/S0025315401004386
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  • 7
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    Worldwide Observations of Remarkable Deep-Sea Squids (2001)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 294 (5551). p. 2505.
    Details
    Publication Date: 2021-07-05
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1126/science.294.5551.2505
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  • 8
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    Identification of Illex coindetii , I. illecebrosus and I. argentinus (Cephalopoda: Ommastrephidae) throughout the Atlantic Ocean; by body and beak characters (2002)
    Springer
    In:  Marine Biology, 141 (1). pp. 131-143.
    Details
    Publication Date: 2021-07-05
    Description: Shortfinned squid species of the genus Illex support commercial fisheries throughout the Atlantic Ocean and Mediterranean Sea. Previous identification of interspecific and intraspecific populations by morphological and size-at-maturity studies have not provided conclusive results. We analysed morphometric body and beak variables (24 characters) in three species of the genus (I. coindetii, I. illecebrosus and I. argentinus), using a geographic and seasonal series of 33 populations for 1,500 specimens of I. coindetii, I. illecebrosus and I. argentinus. Residuals of the regression between each morphometric body and beak variable and mantle length were used as input in a stepwise discriminant analysis. Species discrimination by body and hectocotylus characters required at least eight variables and resulted in high correct-classification percentages for I. coindetii and I. argentinus (75% and 90%, respectively), whereas the best identification resulted from beak characters (83% correctly classified). Size of the suckerless basal arm, sucker-bearing length and beak lateral wall discriminated best among I. coindetii from northern Iberia, northwest Iberia (year-1996) and Ireland in the Atlantic and western Mediterranean versus middle and eastern Mediterranean samples. Canadian shelf and American samples were discriminated from Canadian slope I. illecebrosus. Winter/shelf and winter/slope samples of I. argentinus seemed to form a single biological group separated from Falkland Island, 46°S/autumn spawners and 46°S/1996 specimens along the Patagonian Shelf. No significant sexual or maturity polymorphism was obtained. Discriminant analysis optimised population diagnosis on a morphometric basis of interest in fisheries strategies.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00227-002-0796-7
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  • 9
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    Scratching the sporocyst surface: characterisation of European Aggregata species by atomic force microscopy (2002)
    Springer
    In:  Parasitology Research, 88 (3). pp. 242-246.
    Details
    Publication Date: 2021-07-05
    Description: The application of atomic force microscopy to the understanding of surface structure and atomic-scale measurements on the sporocyst of European Aggregata species, intracellular coccidia of the cephalopods Octopus vulgaris and Sepia officinalis, is presented here. Using the roughness mean surface (RMS) as an index, we reveal texture to be a key parameter for characterisation of the sporocyst surface properties, which resolve the historical synonymy within the European Aggregatidae. Roughness measurements from RMS algorithms may also be an important diagnostic taxonomic character for the differentiation of Aggregata species in the future.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00436-001-0534-y
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  • 10
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    Embryonic stages of the Patagonian squid Loligo gahi (Mollusca: Cephalopoda) (2001)
    California Malacozoological Society
    In:  The Veliger, 44 (2). pp. 109-115.
    Details
    Publication Date: 2021-07-12
    Description: The embryonic development of Loligo gahi was observed from 4-day-old eggs to natural hatching. Egg strands spawned in the Valparaiso Bay, Chile, were transported to an open system tank for incubation. Temperatures ranged from 12.9°C to 13.5°C, salinities from 34%0 to 35%0, and the photoperiod was 12L: 12D. The period from spawning to hatching ranged from 30-35 days. The diameter of individual eggs ranged from 2.5-3.2 mm, and the dorsal mantle length of hatchlings varied from 2.6-3.1 mm. The pattern of chronological appearance of organs was quite similar to loliginid species previously examined (Loligo aff. gahi, Loligo bleekeri, Loligo pealei, Loligo vulgaris reynaudii, and Loligo forbesii). However, L. gahi had a different (faster) development time and a smaller embryo and hatchling size than L. bleekeri (Japan) and L. forbesii (eastern Atlantic Ocean). Differences (heterochronies) among species are discussed. Allometric growth of embryonic development in L. gahi using seven morphometric parameters was undertaken.
    Type: Article , PeerReviewed
    Format: text
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