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  • Other Sources  (16)
  • Blackwell Publishing Ltd
  • Nature Publishing Group
  • Taylor & Francis
  • Wiley-Blackwell
  • 1975-1979  (16)
  • 1950-1954
  • 1
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    Comparison of prey of the black Procellaria petrels of New Zealand (1976)
    Taylor & Francis
    In:  New Zealand Journal of Marine and Freshwater Research , 10 (1). pp. 119-130.
    Details
    Publication Date: 2020-06-22
    Description: Stomach contents of 68 black petrels, Procellaria parkinsoni, 12 Westland black petrels, P. westlandica, and 3 white‐chinned petrels, P. aequinoctialis, were compared. The main prey were Cephalopoda and fish, and these indicated predominantly nocturnal feeding with selection for bioluminescent forms. There is marked latitudinal variation in the Cephalopoda available to these petrels.
    Type: Article , PeerReviewed
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  • 2
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    Evidence for exploitative interspecific competition in mud snails (Hydrobiidae) (1976)
    Wiley-Blackwell
    In:  Oikos, 27 (3). pp. 367-376.
    Details
    Publication Date: 2017-03-31
    Description: Some of the basic assumptions implied in the theory of limiting similarity of coexisting competitors were investigated experimentally in the case of three congeneric, deposit feeding snails. The species show character displacement with respect to size when coexisting. In experimental containers with a natural substrate, interspecific, exploitative competition between snails of the same size range is as intense as intraspecific competition. Diatoms of a given size range, which constitute the most important food, show a "logistic" growth response to grazing, and individual growth of the snails is linearly related to diatom density. The previous observation that the snails show size dependent selection for ingested particle sizes is extended to show that this mechanism leads to a real resource partitioning between snails of different sizes. Size frequency distribution of diatoms in the sediment is a function of the sizes of grazing snails. Size selection of ingested sand grains may also be significant for resource partitioning since the migration rate of the attached microflora between sand grains seems to be slow relative to its growth on the individual sand grains.
    Type: Article , PeerReviewed
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  • 3
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    The blind octopus, Cirrothauma (1978)
    Nature Publishing Group
    In:  Nature, 275 (5680). pp. 547-549.
    Details
    Publication Date: 2019-06-20
    Description: THE rare deep-sea octopod Cirrothauma murrayi Chun 1910 was first described from a single specimen caught during the Michael Sars Expedition of 1910 (ref. 1). Until now it has been caught only four more times2. We describe here three specimens of this species that were recently caught during biological cruises of RRS Discovery (Fig. 1). All of these animals, including the Discovery ones, have been caught at depths of more than 1,500 m, except one that was dip-netted through the ice of the Arctic Ocean3.
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  • 4
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    Volcanics from the Sierra Leone Rise (1978)
    Nature Publishing Group
    In:  Nature, 275 (5680). pp. 536-538.
    Details
    Publication Date: 2018-01-22
    Description: THE Sierra Leone Rise, located in the east equatorial Atlantic, forms a discontinuous chain of seamounts as shallow as 2 km extending with a general NE–SW trend from near the Sierra Leone coast of Africa, to the St Paul fracture zone near the Mid-Atlantic Ridge (Fig. 1). The origin of this feature has remained a topic of discussion. Sheridan et al.1 have hypothesised that the Sierra Leone Rise is a volcanic structure formed at the beginning of the opening of the Atlantic in the early Cretaceous period. The twin features of the Sierra Leone and the Ceara Rises are probably of oceanic origin and were created 80 Myr ago or later in their present-day position with respect to Africa and South America2. The Atlantic ocean exhibits several similar aseismic structures which appear symmetrically oriented with respect to the mid-oceanic ridge, such as the Walvis–Rio Grande Rise and the Iceland Faeroes–Iceland Greenland Ridges. These structures are volcanic edifices having a composition similar to that found in their associated islands3–7. Deep sea drilling of the Ceara Rise8,9 penetrated a basaltic basement of the upper Cretaceous period (Maestrichtian) (Leg 39, Site 354). Similarly, a DSDP hole (Leg 41, Site 366) on the Sierra Leone Rise, penetrated sediments of the same period, without reaching basement10. We report here the discovery of alkali-rich volcanics in an area of the Sierra Leone Rise. The sediment overlying the rock fragments is aged ∼45 Myr.
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  • 5
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    Coordination in physonectid siphonophores (1978)
    Taylor & Francis
    In:  Marine Behaviour and Physiology, 5 (4). pp. 325-346.
    Details
    Publication Date: 2018-05-22
    Description: Intracellular and extracellular recordings from the stem, gastrozooids, palpons, tentacles and nectophores of physonectid siphonophores are presented. The stem organization previously described for Nanomia applies with only minor differences to Forskalia and Agalma. The endodermal epithelium of the stem is shown to be the pathway for slow potentials. Pumping cycles and feeding activities are organized locally in gastrozooids and palpons. Protective retractions are coordinated, probably through a direct nervous link with the stem. This is also true of tentacles. The ectoderm of bracts is a conducting epithelium; excitation in it can induce nervous activity in the stem, but the mechanism is unknown. Impulse traffic between stem and zooids is erratic and breaks down rapidly with repeated stimulation. The motor centres of the nectophores are connected to the stem by a labile nervous link, but an alternative epithelial pathway exists.
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  • 6
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    The peripheral fields of octopusstellar nerves (1979)
    Taylor & Francis
    In:  Marine Behaviour and Physiology, 6 (1). pp. 25-31.
    Details
    Publication Date: 2020-07-14
    Description: Afferent activity in the stellar nerves of Octopus vulgaris has been recorded in response to a probe applying a mechanical stimulus of approximately 5 gm/mm2 to the inner surface of the mantle. Mechanical sensitivity is distributed throughout the mantle surface and there is a large degree of overlap between the peripheral fields of nearby stellar nerves but no overlap of either ventral or dorsal midline. The afferent activity probably results from stimulation of sensory receptors located in the mantle and skin, but antidromic discharge in motor fibres is also possible.
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  • 7
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    Palaeogene ostracods from the continental shelf off Natal, South Africa (1976)
    Taylor & Francis
    In:  Transactions of the Royal Society of South Africa, 42 (1). pp. 35-79.
    Details
    Publication Date: 2020-05-04
    Description: Fifty-two species of Ostracoda are distinguished in the Palaeogene succession of Soekor borehole Jc-1 on the continental shelf off Natal. Two species and one new genus are described, and the ostracod faunas can be grouped into four well-defined assemblages. Vertical variations in the make-up of the ostracod faunas, together with various parameters measured in the forminifera populations, are used to discriminate changes in the conditions of deposition and rates of sediment accumulation. These can be summarized: lower Palaeocene environments were hyposaline, restricted circulation, with rapid accumulation; upper Palaeocene through Eocene conditions were normal marine, alternating restricted and open water circulation, with rapid accumulation in the Palaeocene, and slower accumulation in the Eocene; Oligocene conditions were normal marine, with open water given way to restricted circulation, shallow water environments in the upper part. Sediment accumulation rates in the Oligocene vary rapidly, major changes in the composition of the ostracod populations are recognized as important local biostratigraphical events.
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  • 8
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    Continental margin fault pattern mapped south-west of Ireland (1977)
    Nature Publishing Group
    In:  Nature, 268 (5622). pp. 720-722.
    Details
    Publication Date: 2016-04-15
    Description: A SIMPLE model for continental basement structures at rifted continental margins comprises large fault blocks which trend approximately parallel to, and step down towards, the continental–ocean boundary (for example, see ref. 1). These blocks may be cut by faults which strike across the margin, and, in many theoretical discussions, are shown as being separated from the true oceanic crust by an intermediate zone (see transitional crust of Fig. 3, ref. 2). On many rifted margins these features are deeply buried by young sediments and cannot be stutied in detail. On Goban Spur (Fig. 1), a marginal plateau south-west of Ireland, the young sediment cover is abnormally thin, however, and we have been able to map in detail a 150 km wide continental basement fracture pattern of horsts and grabens using a simple seismic reflection system (160 inch3 air-gun and two-channel hydrophone array). We also suggest a location for the continent–ocean boundary between the Spur and Porcupine Abyssal Plain. There are few previously published data from Goban Spur relevant to our study, although valuable sampling3 and geophysical3–5 results have been obtained north and south of the area.
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  • 9
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    Habitat Selection and Distribution Patterns of Five Species of the Amphipod Genus Gammarus (1979)
    Wiley-Blackwell
    In:  Oikos, 33 (2). pp. 316-322.
    Details
    Publication Date: 2015-10-06
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  • 10
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    The Wadi Natrun: Chemical composition and microbial mass developments in alkaline brines of Eutrophic Desert Lakes (1979)
    Taylor & Francis
    In:  Geomicrobiology Journal, 1 (3). pp. 219-234.
    Details
    Publication Date: 2015-03-10
    Description: Six lakes of the Wadi Natrun, Egypt, were studied with respect to the chemical composition of their brines and the occurrence of microbial mass developments. All investigated lakes showed pH values of approximately 11 and a total salt content of generally more than 30%. The main components were sulfate, carbonate, chloride, sodium, and minor amounts of potassium. Only traces of magnesium and calcium were present, but unusually high concentrations of organic carbon compounds, nitrogen compounds, and phosphate were found. Mass developments of phototrophic sulfur bacteria, halobacteria, cyanobacteria, and green algae were observed. The functions of complete nitrogen and sulfur cycles in the alkaline brines are discussed. The properties of the lakes and their ecology are compared with data on the Dead Sea and Great Salt Lake, Utah.
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