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  • Other Sources  (8)
  • Cambridge University Press  (5)
  • American Meteorological Society
  • Wiley-Blackwell
  • 2005-2009  (8)
  • 1945-1949
  • 1
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    Concealment in epipelagic pterotracheid heteropods (Gastropoda) and cranchiid squids (Cephalopoda) (2009)
    Wiley-Blackwell
    In:  Journal of Zoology, 210 (1). pp. 137-147.
    Details
    Publication Date: 2020-07-17
    Description: Epipelagic pterotracheid heteropods and young cranchiid squids rely primarily on transparency for concealment; yet they have opaque structures, the eyes and visceral organs that compose the visceral nuclei, which can only be camouflaged in other ways. These two groups have achieved convergent solutions to this problem. The visceral nucleus has a narrow and conical shape and a covering layer of iridophores that lies parallel to the surface of the organ. The eyes also have iridophore layers and tapered shapes. A minimal ventral silhouette results when the long axes of the visceral nucleus and eyes are oriented vertically, with the narrowest ends directed downward. In pterotracheids, this is actively achieved by tilting the nucleus and eyes and flexing the body and proboscis. In cranchiids, tilting of the organs alone suffices and adjustments are accomplished much more rapidly than in the pterotracheids.
    Type: Article , PeerReviewed
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  • 2
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    Variability from scales in marine sediments and other historical records (2009)
    Cambridge University Press
    In:  In: Climate Change and Small Pelagic Fish. Cambridge University Press, Cambridge, pp. 45-63.
    Details
    Publication Date: 2018-05-03
    Type: Book chapter , NonPeerReviewed
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  • 3
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    The mandibular movements of Octopus vulgaris (2009)
    Wiley-Blackwell
    In:  Journal of Zoology, 188 (1). pp. 53-67.
    Details
    Publication Date: 2020-07-17
    Description: The movements of the isolated buccal mass of Octopus vulgaris have been investigated. The beaks undergo rhythmic cycles of activity in the absence of applied stimulation and after electrical stimulation of the inter-buccal connective. Initial opening, closing, retraction and re-opening phases of movement are described. This cycle of movements is taken to resemble those in the intact animal. Anatomical and electrical evidence identifies the superior mandibular muscle as being partly responsible for the closing and retraction phases of movement. The inferior buccal ganglion determines the sequence of these buccal movements, but modification by sensory feed-back from the musculature is also implied. The preparation will allow a closer comparison of the control of movement in cephalopods and gastropods.
    Type: Article , PeerReviewed
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  • 4
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    Gravitational spreading controls rift zones and flank instability on El Hierro, Canary Islands (2006)
    Cambridge University Press
    In:  Geological Magazine, 143 (3). pp. 257-268.
    Details
    Publication Date: 2019-09-23
    Description: Ocean island volcanoes frequently develop local rift zones associated with flank movement and flank collapses. The ocean island El Hierro grew by coalescence and collapse of three volcanic edifices, which are an elongated topographic ridge (the Southern Ridge) and two semi-circular volcanic cones (Ti˜nor volcano, El Golfo volcano). During edifice growth and volcano coalescence, eruption fissures nucleated into rift zones that developed a complex triangle pattern. In scaled analogue experimentswe could successfully reproduce the geometry of rift zones and unstable flanks as observed on El Hierro. The experimental results suggest that the rift configuration on El Hierro is the result of gravitational volcano spreading over deformable basal substrata, rather than of deep-seated magma updoming as thought previously. This paper elucidates the importance of the basal substratum and gravitational spreading, and the relationship to rifting and flank instability on El Hierro Island, and may help in understanding similar volcano architectures elsewhere.
    Type: Article , PeerReviewed
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  • 5
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    Rapid invasion and ecological interactions of Diplosoma listerianum in the North Sea, UK (2008)
    Cambridge University Press
    In:  Marine Biodiversity Records, 2 . e59.
    Details
    Publication Date: 2017-11-14
    Description: This paper documents the arrival of Diplosoma listerianum into a habitat with no previously known history of the species. Once established, D. listerianum exploited rapid growth rates relative to the other fouling species present, to quickly become the dominant species in a local fouling assemblage. Most resident macrofoulers were out-competed for space and overgrown, although some resistance to overgrowth was demonstrated by the bryozoan Umbonula littoralis and the tunicate Ascidiella aspersa. In this instance, traits traditionally considered to be relevant for community resistance towards invasion, such as diversity, richness, dominant species identity and open space were not important in controlling the spread of D. listerianum
    Type: Article , PeerReviewed
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  • 6
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    Hydroides dianthus (Polychaeta: Serpulidae), an alien species introduced into Tokyo Bay, Japan (2009)
    Cambridge University Press
    In:  Marine Biodiversity Records, 2 . e87.
    Details
    Publication Date: 2019-02-27
    Description: Calcareous tube polychaetes (family Serpulidae) are notorious biofoulers that are easily transported and introduced to allochthonous habitats. Here we report the recent introduction of Hydroides dianthus (Verrill, 1873) to eastern Japan as its first occurrence in East Asia, probably from European or American coasts. Specimens had been found on artificial hard substrata together with congeners H. ezoensis, H. exaltatus and H. fusicolus in Tokyo Bay, Japan in 2006. The origin, vector, source of introduction and possible impact of H. dianthus on Japanese coasts is discussed from a perspective based on worldwide Hydroides transport.
    Type: Article , PeerReviewed
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  • 7
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    Temporal variability of disturbances: is this important for diversity and structure of marine fouling assemblages? (2007)
    Wiley-Blackwell
    In:  Marine Ecology, 28 (3). pp. 1-9.
    Details
    Publication Date: 2017-10-05
    Description: Natural communities are constantly changing due to a variety of interacting external processes and the temporal occurrence and intensity of these processes can have important implications for the diversity and structure of marine sessile assemblages. In this study, we investigated the effects of temporal variation in a disturbance regime, as well as the specific timing of events within different regimes, on the composition and diversity of marine subtidal fouling assemblages. We did this in a multi-factorial experiment using artificial settlement tiles deployed at two sites on the North East coast of England. We found that although there were significant effects of disturbances on the composition of assemblages, there were no effects of either the variation in the disturbance regime or the specific timing of events on the diversity or assemblage composition at either site. In contrast to recent implications we conclude that in marine fouling assemblages, the variability in disturbance regimes (as a driving force) is unimportant, while disturbance itself is an important force for structuring robust ecosystems.
    Type: Article , PeerReviewed
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  • 8
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    Fossil argonauts (Mollusca: Cephalopoda: Octopodida) from late Miocene siltstones of the Los Angeles Basin, California (2005)
    Cambridge University Press
    In:  Journal of Paleontology, 79 (3). pp. 520-531.
    Details
    Publication Date: 2021-08-26
    Description: Fossilized argonaut egg cases have been recovered from marine siltstones of the late Miocene exposed around margins of the Los Angeles Basin, California. Low radial ribs on the thin, keelless, planispirally coiled egg cases suggest referring them to Mizuhobaris lepta new species. Occurrence of these egg cases in fine-grained Monterey Formation sediments with mesopelagic fish fossils, nannofossils, and Foraminifera indicate deposition in middle-to-upper bathyal depths. Argonaut egg cases have been described from Tertiary strata in Japan, New Zealand, Sumatra, and Europe, but this is the first report of fossilized argonaut egg cases from the Western Hemisphere. Secretion of egg cases by argonauts probably developed during the Paleogene as a solution to problems of spawning encountered by octopi as they acquired an epipelagic, open-ocean habitat. Shape and sculpture of the egg cases represent responses to hydrodynamics rather than an inheritance from or copying of ectocochliate cephalopods. The cases may provide the eggs with protection from ultraviolet radiation present in the argonauts' near-surface habitat.
    Type: Article , PeerReviewed
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