Report of the Fourteenth Meeting of the Scientific Committee
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Review: the Energetic Value of Zooplankton and Nekton Species of the Southern Ocean
Marine Biology (2018) 165:129 https://doi.org/10.1007/s00227-018-3386-z REVIEW, CONCEPT, AND SYNTHESIS Review: the energetic value of zooplankton and nekton species of the Southern Ocean Fokje L. Schaafsma1 · Yves Cherel2 · Hauke Flores3 · Jan Andries van Franeker1 · Mary‑Anne Lea4 · Ben Raymond5,4,6 · Anton P. van de Putte7 Received: 8 March 2018 / Accepted: 5 July 2018 / Published online: 18 July 2018 © The Author(s) 2018 Abstract Understanding the energy fux through food webs is important for estimating the capacity of marine ecosystems to support stocks of living resources. The energy density of species involved in trophic energy transfer has been measured in a large number of small studies, scattered over a 40-year publication record. Here, we reviewed energy density records of Southern Ocean zooplankton, nekton and several benthic taxa, including previously unpublished data. Comparing measured taxa, energy densities were highest in myctophid fshes (ranging from 17.1 to 39.3 kJ g−1 DW), intermediate in crustaceans (7.1 to 25.3 kJ g−1 DW), squid (16.2 to 24.0 kJ g−1 DW) and other fsh families (14.8 to 29.9 kJ g−1 DW), and lowest in jelly fsh (10.8 to 18.0 kJ g−1 DW), polychaetes (9.2 to 14.2 kJ g−1 DW) and chaetognaths (5.0–11.7 kJ g−1 DW). Data reveals diferences in energy density within and between species related to size, age and other life cycle parameters. Important taxa in Antarctic food webs, such as copepods, squid and small euphausiids, remain under-sampled. -
Age and Growth of Brauer's Lanternfish Gymnoscopelus Braueri and Rhombic Lanternfish Krefftichthys Anderssoni (Family Myctophidae) in the Scotia Sea, Southern Ocean
Received: 22 July 2019 Accepted: 14 November 2019 DOI: 10.1111/jfb.14206 REGULAR PAPER FISH Age and growth of Brauer's lanternfish Gymnoscopelus braueri and rhombic lanternfish Krefftichthys anderssoni (Family Myctophidae) in the Scotia Sea, Southern Ocean Ryan A. Saunders1 | Silvia Lourenço2,3 | Rui P. Vieira4 | Martin A. Collins1 | Carlos A. Assis5,6 | Jose C. Xavier7,1 1British Antarctic Survey, Natural Environment Research Council, Cambridge, UK Abstract 2MARE - Marine and Environmental Sciences This study examines age and growth of Brauer's lanternfish Gymnoscopelus braueri and Centre, Polytechnic of Leiria, Peniche, Portugal rhombic lanternfish Krefftichthys anderssoni from the Scotia Sea in the Southern Ocean, 3CIIMAR/CIMAR, Interdisciplinary Centre of Marine and Environmental Research, through the analysis of annual growth increments deposited on sagittal otoliths. Oto- University of Porto, Matosinhos, Portugal lith pairs from 177 G. braueri and 118 K. anderssoni were collected in different seasons 4 Centre for Environment Fisheries and from the region between 2004 and 2009. Otolith-edge analysis suggested a seasonal Aquaculture Sciences, Lowestoft, UK change in opaque and hyaline depositions, indicative of an annual growth pattern, 5MARE-ULisboa – Marine and Environmental Sciences Centre, Faculty of Sciences, although variation within the populations of both species was apparent. Age estimates University of Lisbon, Lisbon, Portugal varied from 1 to 6 years for G. braueri (40 to 139 mm standard length; LS)andfrom 6Department of Animal Biology, Faculty of Sciences, University of Lisbon, Lisbon, Portugal 0 to 2 years for K. anderssoni (26 to 70 mm LS). Length-at-age data were broadly con- 7Department of Life Sciences, MARE-UC, sistent with population cohort parameters identified in concurrent length-frequency University of Coimbra, Coimbra, Portugal data from the region for both species. -
Trophic-Based Analyses of the Scotia Sea Ecosystem with an Examination of the Effects of Some Data Limitations and Uncertainties
Trophic-based analyses of the Scotia Sea ecosystem with an examination of the effects of some data limitations and uncertainties Sarah Collings Doctor of Philosophy University of York Biology September 2015 Abstract The Scotia Sea is a sub-region of the Southern Ocean with a unique biological operation, including high rates of primary production, high abundances of Antarctic krill, and a diverse community of land-breeding predators. Trophic interactions link all species in an ecosystem into a network known as the food web. Theoretical analyses of trophic food webs, which are parameterised using diet composition data, offer useful tools to explore food web structure and operation. However, limitations in diet data can cause uncertainty in subsequent food web analyses. Therefore, this thesis had two aims: (i) to provide ecological insight into the Scotia Sea food web using theoretical analyses; and (ii) to identify, explore and ameliorate for the effects of some data limitations on these analyses. Therefore, in Chapter 2, I collated a set of diet composition data for consumers in the Scotia Sea, and highlighted its strengths and limitations. In Chapters 3 and 4, I constructed food web analyses to draw ecological insight into the Scotia Sea food web. I indicated the robustness of these conclusions to some of the assumptions I used to construct them. Finally, in Chapter 5, I constructed a probabilistic model of a penguin encountering prey to investigate changes in trophic interactions caused by the spatial and temporal variability of their prey. I show that natural variabilities, such as the spatial aggregation of prey into swarms, can explain observed foraging outcomes for this predator. -
Electrona Carlsbergi (Taning, 1932), the Principal Component of a Deep Scattering Layer in the Pacific Sector of the Antarctic Ocean
POLISH POLAR RESEARCH (POL. POLAR RES.) 4 1 ~4 71 -78 1983 POLSKIE BADANIA POLARNE Tomasz В. LINKOWSKI Department of Ichthyology, Sea Fisheries Institute, al. Zjednocze- nia 1, 81-345 Gdynia, Poland Electrona carlsbergi (Taning, 1932), the principal component of a deep scattering layer in the Pacific sector of the Antarctic Ocean ABSTRACT: During a cruise of the fishing vessel m/t "Sagitta" around the Antarctic, the occurrence of DSL was noted in a small area of the Pacific sector of the Antarctic waters. The layers were found at depths of 50—150 m. Their main component was E. carlsbergi (family Myctophidae), whose maximum density was within the range of 219—437 x 10" fish/m3. Key words: Antarctic, Myctophidae, DSL 1. Introduction The occurrence of water layers with sound-scattering properties (the so-called deep scattering layers, DSL) is typical for most areas of the open ocean (Marshall 1951). The absence of DSL in the Antarctic waters south of the Antarctic Convergence was noted by Dietz (1948) and Batzler and Vent (1967). Deep scattering layers were first observed in Antarctic waters by Nunez and Novarini (1976) who investgated the Drake Passage area by means of a 12 kHz echosounder. It was noted that myctophids are often the main component of deep scattering layers (Pearcy and Laurs 1966, Barham 1966, Backus et al. 1968, Backus et al. 1970, Baird et al. 1974, Taylor 1968, Gjosaeter 1981, and others). 2. Material and methods Materials for the present paper were collected during a research cruise of a commercial trawler m/t "Sagitta", taking part in the 3rd Polish Marine 72 Tomasz В. -
The Antarctic Circumpolar Current The
Chapter 36H. Southern Ocean Contributors: Viviana Alder, Maurizio Azzaro, Rodrigo Hucke-Gaete, Renzo Mosetti, José Luis Orgeira, Liliana Quartino, Andrea Raya Rey, Laura Schejter, Michael Vecchione, Enrique R. Marschoff (Lead member) The Southern Ocean is the common denomination given to the southern extrema of the Indian, Pacific and Atlantic Oceans, extending southwards to the Antarctic Continent. Its main oceanographic feature, the Antarctic Circumpolar Current (ACC), is the world’s only global current, flowing eastwards around Antarctica in a closed circulation with its flow unimpeded by continents. The ACC is today the largest ocean current, and the major means of exchange of water between oceans; it is believed to be the cause of the development of Antarctic continental glaciation by reducing meridional heat transport across the Southern Ocean (e.g., Kennett, 1977; Barker et al., 2007). The formation of eddies in the Antarctic Circumpolar Current has a significant role in the distribution of plankton and in the warming observed in the Southern Ocean. As with the ACC, the westward-flowing Antarctic Coastal Current, or East Wind Drift (EWD), is wind-driven. These two current systems are connected by a series of gyres and retroflections (e.g., gyres in the Prydz Bay region, in the Weddell Sea, in the Bellingshausen Sea) (Figure 1). © 2016 United Nations 1 The boundaries and names shown and the designations used on this map do not imply official endorsement or acceptance by the United Nations. Figure 1. From Turner et al. (eds.), 2009. Schematic map of major currents south of 20ºS (F = Front; C = Current; G = Gyre) (Rintoul et al., 2001); showing (i) the Polar Front and Sub-Antarctic Front, which are the major fronts of the Antarctic Circumpolar Current; (ii) other regional currents; (iii) the Weddell and Ross Sea Gyres; and (iv) depths shallower than 3,500m shaded (all from Rintoul et al, 2001). -
Prey Composition and Daily Rations of Myctophid Fishes in the Southern Ocean
MARINE ECOLOGY PROGRESS SERIES Vol. 134: 1-14, 1996 Published April 25 Mar Ecol Prog Ser I I Prey composition and daily rations of myctophid fishes in the Southern Ocean E. A. Pakhomov*, R. Perissinotto, C. D. McQuaid Southern Ocean Group. Department of Zoology and Entomology, Rhodes University. PO Box 94, Grahamstown. 6140, South Africa ABSTRACT. The feeding ecology of myctophids was studied using data collected during 5 South African scientific cruises to the Southern Ocean from 1985 to 1995, A total of 362 specimens, compris- ing 36 species, were analyzed for gut contents. Myctophid biomass levels, estimated from Bongo net tows, are among the lowest yet recorded for the Southern Ocean. Peak biomass levels were associated with the main frontal zones and with a permanent polynya region in the Lazarev Sea. Results show that all myctophid species are opportunistic mesozooplankton feeders exhibiting a high degree of overlap in their food spectrum and consuming primanly the most abundant species of copepods, euphauslids, hyperiids and pteropods. Daily rations were estimated using 3 different approaches and ranged from 0.2 to 4.4% of dry body weights. Generally, the daily food intake was equivalent to 0.5 (lower mean] to 2.9 (upper mean) of dry body weight for Antarctic and subantarctic species, and between 1.2 and 3.8% for temperate and s~~btrop~calspecies. Antarctic krill, Euphausia superba, was usually poorly repre- sented in the stomachs of all but 1 myctophid specles. The I-esultsof this study therefore do not support the hypothesis that krill plays a major role in the feeding ecology and budget of myctophids. -
Thirty Three
thirty three (*and whose homes must be protected) www.antarcticocean.org Image by John B. Weller introduction Simply put, the oceans are our life support system. unusual species that thrive in this harsh but beautiful They are the blue heart of the planet. But despite environment. Protecting these magnifcent creatures and this, we have witnessed the ocean undergo massive their home is critical for the knowledge base we need. changes in just the last 50 years. Overfshing has reduced thriving populations of big fsh to tiny The 33 species profled here are a small sample of remnants of their formerly prosperous masses. the many that live in the Southern Ocean. Each one Dead zones incapable of supporting marine life have matters, whether beautiful or ugly, large or small, arisen in some places around the world and climate predator or prey. Antarctica is known for its iconic change is placing ever increasing stresses on marine penguins, seals, and whales, but its other species species and habitats. It is not only marine life that are just as interesting. From coral that can pick itself has been affected: even the water itself has begun up and move across the ocean foor in search of to acidify because of rising carbon dioxide levels in food to a squid that has the largest eye of any known the atmosphere. animal, Antarctica’s ecosystems have a richness and complexity that we are only beginning to appreciate. Despite these and other problems, there is still hope New species are discovered regularly. Perhaps most that we can restore and protect the health of the ocean. -
(Copepoda: Pennellidae) Parasitizing Myctophid Fishes in the Southern Ocean: New Information from Seabird Diet
J. Parasitol., 90(6), 2004, pp. 1288±1292 q American Society of Parasitologists 2004 SARCOTRETES (COPEPODA: PENNELLIDAE) PARASITIZING MYCTOPHID FISHES IN THE SOUTHERN OCEAN: NEW INFORMATION FROM SEABIRD DIET Yves Cherel and Geoffrey A. Boxshall* Centre d'Etudes Biologiques de ChizeÂ, UPR 1934 du Centre National de la Recherche Scienti®que, BP 14, F-79360 Villiers-en-Bois, France. e-mail: [email protected] ABSTRACT: Copepods are common parasites of marine ®shes, but little information is available on the biology of species that parasitize mesopelagic ®shes in oceanic waters. In this study, we report the ®nding of large numbers of Sarcotretes spp. (n 5 2,340) in dietary samples of king penguins collected at Crozet and the Falklands Islands. Analysis of penguin food indicates that S. scopeli Jungersen parasitizes myctophid ®shes, Protomyctophum tenisoni (Norman), in the southern Indian Ocean and P. choriodon Hulley in the southern Atlantic. It suggests that the much rarer S. eristaliformis (Brian) also parasitizes myctophids, but the host species of that copepod remains to be determined. The new data add signi®cant information concerning the hosts and distribution of Sarcotretes spp. in the Southern Ocean and emphasize the usefulness of ichthyophagous predators in revealing valuable information on the biology of organisms that parasitize their prey. Copepods are common parasites of marine ®shes. They have and in February 2001 at Volunteer Beach, East Falkland (518299S, been studied extensively in coastal and neritic waters, where 578509W; Falkland Islands). Dietary samples were collected using the stomach-¯ushing method on randomly chosen adult king penguins re- they have become pests of ®sh species of commercial impor- turning ashore to feed their chicks. -
MARIVE Orvitηologu
MARINE ORNITHOLOGY Journal of Seabird Science and Conservation Volume 40(2) October 2012 MARINE ORNITHOLOGY An International Journal of Seabird Science and Conservation Published by the Pacific Seabird Group On behalf of the African, Australasian, Dutch, Japanese, Pacific and UK Seabird Groups ISSN 1018-3337 EDITOR-IN-CHIEF Tony Gaston, Environment Canada EDITORS Rob Barrett, University of Tromsø, Norway Alan Burger, University of Victoria, Canada Peter Dann, Phillip Island Nature Park, Australia Sebastien Descamps, Norwegian Polar Institute, Norway Tony Diamond, University of New Brunswick, Canada Peter G.H. Evans, University of Bangor, UK Nina Karnovsky, Pomona College, California, USA Kathy Kuletz, US Fish and Wildlife Service, Anchorage, Alaska, USA Yan Ropert-Coudert, CNRS-Strasburg, France BOOK REVIEW EDITOR Patricia Baird, Simon Fraser University, Canada FOUNDING EDITOR John Cooper, South Africa TECHNICAL EDITOR Carolyn Brown, carolynjbrown.wordpress.com DTP Reber Creative reberco.com Marine Ornithology is abstracted/indexed in the Antarctic Bibliography, Aquatic Sciences and Fisheries Abstracts, Biological Abstracts, BIOSIS Previews, Current Advances in Ecological and Environmental Sciences, Current Antarctic Literature, Ecological Abstracts, Ecology Abstracts, Geo Abstracts, Geobase, Oceanographic Literature Review, Ornithological Abstracts, Polar and Glacialogical Abstracts, Recent Ornithological Literature, Wildlife Review and Zoological Record – Aves. Front cover picture: An albino Guanay Cormorant Phalacrocorax bougainvillii stands out among its normal conspecifics at Isla Pescadores, Peru (see Delord et al., p. 123). Photo courtesy Karine Delord. Dutch Seabird Group MARINE ORNITHOLOGY VOL. 40 NO. 2 ISSN 1018-3337 2012 CONTENTS CONTRIBUTED PAPERS FIJN, R.C., VAN FRANEKER, J.A. & TRATHAN, P.N. Dietary variation in chick-feeding and self-provisioning Cape Petrel Daption capense and Snow Petrel Pagodroma nivea at Signy Island, South Orkney Islands, Antarctica . -
Feeding Ecology of Myctophid Fishes in the Northern Scotia Sea
Vol. 386: 221–236, 2009 MARINE ECOLOGY PROGRESS SERIES Published July 2 doi: 10.3354/meps08064 Mar Ecol Prog Ser Feeding ecology of myctophid fishes in the northern Scotia Sea R. S. Shreeve1, M. A. Collins1, 2,*, G. A. Tarling1, C. E. Main1, 3, P. Ward1, N. M. Johnston1 1British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK 2Present address: Government of South Georgia and South Sandwich Islands, Government House, Stanley, Falkland Islands 3Present address: Fisheries Research Services, 375 Victoria Road, Aberdeen AB11 9DB, UK ABSTRACT: The diets of 9 species of myctophid fishes, Electrona carlsbergi, E. antarctica, Gymno- scopelus fraseri, G. nicholsi, G. braueri, Protomyctophum bolini, P. choriodon, Krefftichthys ander- ssoni and Nannobrachium achirus, were investigated during austral autumn in the northern Scotia Sea. Based on the percent index of relative importance (%IRI), the data suggest dietary specialisation in some species, which may permit resource partitioning. Hierarchical agglomerative cluster analy- sis of Bray-Curtis similarity (60% threshold) separated the myctophid community into distinct feed- ing guilds. One group (G. braueri and E. antarctica) fed principally on Themisto gaudichaudii, another (P. choriodon and G. fraseri) primarily on copepods (Metridia spp. and Rhincalanus gigas), and a third group (G. nicholsi and P. bolini) consumed copepods and euphausids (mostly Metridia spp. and Euphausia frigida). The diets of E. carlsbergi and K. anderssoni differed from the other spe- cies, with E. carlsbergi being the only species that consumed salps. There was a general switch in diet from copepods to euphausiids and amphipods as the myctophid predator size increased. -
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Vol. 503: 23–40, 2014 MARINE ECOLOGY PROGRESS SERIES Published April 29 doi: 10.3354/meps10731 Mar Ecol Prog Ser Species composition and acoustic signatures of mesopelagic organisms in a subtropical convergence zone, the New Zealand Chatham Rise Stéphane Gauthier1,2,*, Johannes Oeffner1, Richard L. O’Driscoll1 1National Institute of Water and Atmospheric Research, Private Bag 14-901, Kilbirnie, Wellington, New Zealand 2Fisheries and Oceans Canada, Institute of Ocean Sciences, PO Box 6000, Sidney, British Columbia V8L 4B2, Canada ABSTRACT: The Chatham Rise is a submarine ridge east of New Zealand. The subtropical conver- gence occurs over this ridge and it is an area of high productivity, associated with important deep- water fisheries. Acoustic recordings suggest that there is a relatively high biomass of mesopelagic fish over the Chatham Rise, but little is known about the species composition, distribution, and spatio-temporal dynamics of the organisms responsible for the acoustic scattering layers. Two research trawl and acoustic surveys were carried out in May and June 2008 and November 2011 to assess the distribution and acoustic signatures of mesopelagic animals on the Chatham Rise. A total of 171 species or species groups were caught in 86 midwater trawls to a maximum depth of 1000 m. Seven species assemblages were described corresponding to different acoustic mark types. These 7 assemblages were dominated by euphausiids, Maurolicus australis (Stomiiformes), Lam pa nyc - todes hectoris, Symbolophorus boops, Electrona carlsbergi, Diaphus danae and Gymnoscopelus piabilis (all Myctophiformes). Euphausiids could be separated from mesopelagic fish species based on their multi-frequency acoustic response, but the 6 fish groups could not be separated based on their frequency response alone. -
Latitudinal and Bathymetric Patterns in the Distribution and Abundance of Mesopelagic fish in the Scotia Sea
Deep-Sea Research II 59-60 (2012) 189–198 Contents lists available at ScienceDirect Deep-Sea Research II journal homepage: www.elsevier.com/locate/dsr2 Latitudinal and bathymetric patterns in the distribution and abundance of mesopelagic fish in the Scotia Sea Martin A. Collins a,b,n, Gabriele Stowasser a, Sophie Fielding a, Rachel Shreeve a, Jose´ C. Xavier c, Hugh J. Venables a, Peter Enderlein a, Yves Cherel d, Anton Van de Putte e a British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK b Oceanlab, Aberdeen University, Newburgh, Aberdeenshire AB41 6AA, UK c Institute of Marine Research, University of Coimbra, 3001-401 Coimbra, Portugal d Centre d’Etudes Biologiques de Chize´, UPR 1934 du CNRS, 79360 Villiers-en-Bois, France e Katholieke Universiteit Leuven, Laboratory of Animal Diversity and Systematics, Ch. Deberiotstraat 32, B-3000 Leuven, Belgium article info abstract Available online 27 July 2011 Mesopelagic fish are a key component of the pelagic ecosystem throughout the world’s oceans. Opening Keywords: and closing nets were used to investigate patterns in the distribution and abundance of mesopelagic Myctophid fish from the surface to 1000 m on a series of transects across the Scotia Sea from the ice-edge to the Myctophidae Antarctic Polar Front. A total of 141 non-target net hauls were undertaken during three cruises (Nov Bathylagidae 2006, Jan 2008 and Mar 2009), with 7852 teleost fish captured, representing 43 species in 17 families. A Biomass further 1517 fish were caught in targeted net hauls. The dominant families were the Myctophidae Southern Ocean (6961 specimens; 21 species) and Bathylagidae (1467 specimens; 4 species).