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  • 2025-2025  (1)
  • 1990-1994  (10)
  • 1980-1984  (8)
  • 1
    Book
    Book
    Cephalopod life cycles (1983-)
    London [u.a.] : Academic Press
    Details Availability
    Type of Medium: Book
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean: analysis of morphometric data and tests of causal hypotheses (1994)
    Springer
    Marine biology 119 (1994), S. 541-547 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Geographic variation in the squid Loligo forbesi was investigated using multivariate analysis of morphometric and meristic characters in samples of squid taken from 13 localities in the Northeast Atlantic Ocean. Two character sets, body morphometrics and beak morphometrics, indicated similar patterns of variation, with squid from the Azores differing markedly from those on the continental shelf. No consistent pattern was apparent in meristic data. Partial Mantel tests indicated that similarity matrices for morphological data were significantly correlated with distance matrices for (a) geographic proximity, (b) whether the capture site was on the continental shelf or the Azorean bank, and (c) (beak data only) average seasurface temperature at site of capture. Partial Mantel tests on allozyme data for the same individuals support hypothesis (b). The results suggest that L. forbesi in the Azores may reasonably be regarded as a distinct stock, differing significantly from L. forbesi on the continental shelf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354316
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optic gland enlargement and female gonad maturation in a population of the octopuseledone cirrhosa: a multivariate analysis (1984)
    Springer
    Marine biology 79 (1984), S. 127-132 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eleven principal component analyses were performed on morphometric data from a series of monthly samples of the octopusEledone cirrhosa (Lamarck) collected from March 1978 through January 1979 in the Aberdeen (Scotland) area. This technique has allowed a partitioning of general growth effects from variation in the reproductive system. Optic gland size varies as a reproductive character together with ovary and oviducal glands. Optic gland size not clearly associated with other cerebral organs, the brain and optic lobes. The association between the reprountive characters developed during the onset of the main period of reproductive maturation in the early summer of 1978 and persisted for the remainder of that year. This result supports the experimental evidence linking optic gland enlargement with female gonad maturation and suggests that this process occurs normally in the field population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951821
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    Paper (German National Licenses)
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  • 4
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    Identification of fish otoliths and bones in faeces and digestive tracts of seals (1991)
    Wiley-Blackwell
    In:  Journal of Zoology, 224 (2). pp. 320-328.
    Details
    Publication Date: 2020-07-17
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1469-7998.1991.tb04810.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Components of body pattern displays in the octopus Eledone cirrhosa (Mollusca: Cephalopoda) (1981)
    Taylor & Francis
    In:  Marine Behaviour and Physiology, 8 (2). pp. 135-148.
    Details
    Publication Date: 2020-07-14
    Description: The major light and dark components of body displays are described and classified for the octopus Eledone cirrhosa (Lamarck) under aquarium conditions. Comparisons are made with Octopus vulgaris and Eledone moschata. Upon the basic similarity of white display components in the three species is superimposed a trend of modification. Dark components are less various in Eledone cirrhosa and although the chromatophores are organised with leucophores into chromatic units these are not clearly limited morphologically by “grooves”. The mottle patterns of Eledone seem to be arranged along the longitudinal and latitudinal (radial) axes of the animal, the grade of mottle does not respond to grade of background contrast.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/10236248109387010
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Sexual maturation in the octopus Eledone cirrhosa Lamarck (1982)
    Institute of Malacology
    In:  Malacologia, 22 (1-2). pp. 189-196.
    Details
    Publication Date: 2020-07-15
    Description: Studies of sexual maturation have been made on a large sample of Eledone cirrhosa from the North Sea off Aberdeen, Scotland. In females the wet weights of the ovary and oviducal glands have been recorded for a wide range of body sizes and related to the total body weight. The length dlstribution of a sample of eggs from each ovary was also measured. Assessed either by ovary enlargement or the mean egg length, female E. cirrhosa become mature at a wide ränge of body size and so state of maturity is not predictable from size of the animal. In males the total weight of genital bag is, by contrast, clearly correlated with body weight although this is not true for testis alone, presumably because of transfer of sperm from testis to spermatophoric sac.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    On growth of the octopus Eledone cirrhosa (1982)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 62 (2). pp. 277-296.
    Details
    Publication Date: 2020-07-16
    Description: The growth of the octopus Eledone cirrhosa has been studied in a population from the North Sea off Aberdeen. Data are presented for the growth of individuals isolated in aquarium conditions; the growth of size classes in thefieldpopulation; and preliminary information on the growth relationships of gonad, somatic, cardiac and brain components of the body. At 15 °C Eledone cirrhosa is capable of growing from 10 to 1000 g in 270 days. From octopuses which feed readily in captivity, weight specific growth rates of up to about 3–5 % day-1 for animals of 100 g body weight are recorded, falling to a maximum of about 1–5 % day-1 at body sizes above 500 g. Females stop growing when sexually mature, but in the sample captured they were consistently larger than males, a feature which may account for the 7:1 bias towards the incidence of females. On a wet-weight basis, the mean food incorporation into growth is 37 % of the food ingested, which is 49% of the gross weight of crabs killed. Field data for 1978/79 suggest that animals recruited to the population at the beginning of the year grew steadily until December, overwintered without growing, then grew rapidly for several months in the subsequent year before disappearing from the samples. The estimated average age of those animals and by implication, the life span, is 20 months.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    Prey handling and salivary secretions in octopuses (1990)
    Aberdeen University Press
    In:  In: Trophic Relationships in the Marine Environment : Proceedings of the 24. European Marine Biology Symposium. , ed. by Barnes, M. and Gibson, R. N. Aberdeen University Press, Aberdeen, pp. 541-552.
    Details
    Publication Date: 2020-01-17
    Description: Octopuses are known to be highly efficient at the extraction of flesh from their crustacean prey. Experiments on capture and handling of crabs (Carcinus maenas) by the octopus Eledone cirrhosa show that paralysis of the crab invariably precedes hole boring of the carapace. The time course of feeding is described and it is shown that the ingestion of crab meat does not occur before about 40 min after capture for this specific predator-prey interaction although crabs are paralysed after 1-5 min. Comparative observations on hole-boring behaviour are given for Octopus vulgaris and O. dofleini. The results are discussed in relation to recent data on the biochemical composition of the secretions of the posterior salivary gland.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 9
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    Population variation and growth in Loligo forbesi (Cephalopoda: Loliginidae) from Scottish waters (1993)
    Tokai University press
    In:  In: Recent advances in cephalopod fisheries biology. Tokai University press, Tokyo, pp. 49-59.
    Details
    Publication Date: 2021-01-19
    Description: Samples of Loligo forbesi were obtained from commercial sources and research cruises in Scottish waters for the period May 1984 to October 1986. The sea areas sampled fell into ICES fishery statistical sub-dividons VIb Rockall, VIa west coast, IVa nothern North Sea and IVb central North Sea. Within this area there were sexual and spatial variations in size, length-weight and body component/DML relationships. Males have larger overall mean size (DML and weight) and for both sexes the mean size of L. forbesi from the north eastern Atlantic is larger than those from the North Sea. The length-weight relationship in females was significantly different from that of males, and in both sexes the length-weight relationship was significantly different between samples from the north eastern Atlantic and those from North Sea waters. Multivariate analyses of fifteen morphometrical characters have identified variation in the morphometrics of L. forbesi within this range of distribution in Scottish waters. Growth rates were estimated for males and females separately from monthly increments in modes of length frequency histograms. Fishery recruitment occured mainly during April/May of each year at ~130mm DML (males) and ~100mm DML (females) followed by maximum growth rates of 286mm DML/month and 17.5mm DML/month respectively. There was some evidence for a second, weaker recruitment in November which showed slower growth rates.
    Type: Book chapter , PeerReviewed
    Format: text
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  • 10
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    The female reproductive cycle of the octopus, Eledone cirrhosa (1983)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 63 . pp. 71-83.
    Details
    Publication Date: 2020-07-16
    Description: Changes in the relative size of the ovary, oviducal glands and eggs are described for Eledone cirrhosa captured from the North Sea off Aberdeen over a 3 year period (N = 488). The analysis is based only on freshly caught animals, excluding those held in aquarium conditions (〉 5 days). Ovary enlargement and egg size estimates are used as indices of sexual maturity. Between 0–15% and 18–95% of total body weight is contributed by the ovary. Maximum egg length in the ovary ranges up to 7 mm. On these criteria, sexual maturation typically occurs at body sizes between 400–1000 g although some animals of 1000–1200 g are found showing no evidence of ovary enlargement. The majority of the monthly sample is always immature but maturation can apparently occur at almost any time of the year. Increase in mean ovary index and mean values for egg size are strongly seasonal and indicate a peak incidence of sexual maturity over 2–3 months in the July-September period. Spawning is presumed to follow within 1 month. Estimates of the fecundity of the females, based on the egg sample from the ovary, range from 2·2 × 103 to 55 × 10 3 eggs with a mean of 11 × 10 3 and a mode of 7·5 × 10 3 eggs.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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