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  1. AU="Doug Beare"
  2. AU="Gisela Vecchio"
  3. AU="Sanguineti, M."
  4. AU="Cowie, Bruce"
  5. AU="Vílchez-Acosta, Alba"
  6. AU="Schierbaum, Luca"
  7. AU="Manea, M"
  8. AU=Slimano Florian
  9. AU="Awais, M."
  10. AU="Youn, Jong-Ung"
  11. AU="Song, Min-Gyu"
  12. AU="Sawada, Takashi"
  13. AU="Ferrucci, Francesco"
  14. AU="Agrawal, Karan"

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  1. Artikel ; Online: Overfishing and the replacement of demersal finfish by shellfish

    Carlotta Molfese / Doug Beare / Jason M Hall-Spencer

    PLoS ONE, Vol 9, Iss 7, p e

    an example from the English Channel.

    2014  Band 101506

    Abstract: The worldwide depletion of major fish stocks through intensive industrial fishing is thought to have profoundly altered the trophic structure of marine ecosystems. Here we assess changes in the trophic structure of the English Channel marine ecosystem ... ...

    Abstract The worldwide depletion of major fish stocks through intensive industrial fishing is thought to have profoundly altered the trophic structure of marine ecosystems. Here we assess changes in the trophic structure of the English Channel marine ecosystem using a 90-year time-series (1920-2010) of commercial fishery landings. Our analysis was based on estimates of the mean trophic level (mTL) of annual landings and the Fishing-in-Balance index (FiB). Food webs of the Channel ecosystem have been altered, as shown by a significant decline in the mTL of fishery landings whilst increases in the FiB index suggest increased fishing effort and fishery expansion. Large, high trophic level species (e.g. spurdog, cod, ling) have been increasingly replaced by smaller, low trophic level fish (e.g. small spotted catsharks) and invertebrates (e.g. scallops, crabs and lobster). Declining trophic levels in fisheries catches have occurred worldwide, with fish catches progressively being replaced by invertebrates. We argue that a network of fisheries closures would help rebalance the trophic status of the Channel and allow regeneration of marine ecosystems.
    Schlagwörter Medicine ; R ; Science ; Q
    Thema/Rubrik (Code) 333
    Sprache Englisch
    Erscheinungsdatum 2014-01-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Yellowfin Tuna Behavioural Ecology and Catchability in the South Atlantic

    Serena R. Wright / David Righton / Joachim Naulaerts / Robert J. Schallert / Chris A. Griffiths / Taylor Chapple / Daniel Madigan / Vladimir Laptikhovsky / Victoria Bendall / Rhys Hobbs / Doug Beare / Elizabeth Clingham / Barbara Block / Martin A. Collins

    Frontiers in Marine Science, Vol

    The Right Place at the Right Time (and Depth)

    2021  Band 8

    Abstract: The yellowfin tuna (Thunnus albacares: YFT) is a widely distributed, migratory species that supports valuable commercial fisheries. Landings of YFT are seasonally and spatially variable, reflecting changes in their availability and accessibility to ... ...

    Abstract The yellowfin tuna (Thunnus albacares: YFT) is a widely distributed, migratory species that supports valuable commercial fisheries. Landings of YFT are seasonally and spatially variable, reflecting changes in their availability and accessibility to different fleets and metiers which, in turn, has implications for sustainable management. Understanding the dynamics of YFT behaviour and how it is affected by biological and ecological factors is therefore of consequence to fisheries management design. Archival and pop-up satellite tags (PSAT) were used in the South Atlantic Ocean around St Helena between 2015 and 2020 to collect information on the movements, foraging and locomotory behaviour of YFT. The study aimed to (1) identify vertical behaviour of YFT within St Helena’s EEZ; (2) assess the timing and depth of potential feeding events and (3) to use the information to inform on the catchability of YFT to the local pole and line fishing fleet. Results indicate that the YFT daytime behaviour shifted between shallow with high incidence of fast starts in surface waters in summer months (December to April), to deep with high incidence of strikes at depth in colder months (May to November). Catchability of YFT was significantly reduced between May and November as YFT spent more time at depths below 100 m during the day, which coincides with a reduction in the quantity of YFT caught by the inshore fleet.
    Schlagwörter satellite tags ; archival tags ; acceleration ; fast-start ; tagging–internal tag ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
    Thema/Rubrik (Code) 551
    Sprache Englisch
    Erscheinungsdatum 2021-05-01T00:00:00Z
    Verlag Frontiers Media S.A.
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Artikel ; Online: The contribution of nearshore fish aggregating devices (FADs) to food security and livelihoods in Solomon Islands.

    Joelle A Albert / Doug Beare / Anne-Maree Schwarz / Simon Albert / Regon Warren / James Teri / Faye Siota / Neil L Andrew

    PLoS ONE, Vol 9, Iss 12, p e

    2014  Band 115386

    Abstract: Fish aggregating devices, or FADs, are used widely in developing countries to concentrate pelagic fish, making them easier to catch. Nearshore FADs anchored close to the coast allow access for rural communities, but despite their popularity among policy ... ...

    Abstract Fish aggregating devices, or FADs, are used widely in developing countries to concentrate pelagic fish, making them easier to catch. Nearshore FADs anchored close to the coast allow access for rural communities, but despite their popularity among policy makers, there is a dearth of empirical analysis of their contributions to the supply of fish and to fisheries management. In this paper we demonstrate that nearshore FADs increased the supply of fish to four communities in Solomon Islands. Estimated total annual fish catch ranged from 4300 to 12,000 kg across the study villages, with nearshore FADs contributing up to 45% of the catch. While it is clear that FADs increased the supply of fish, FAD catch rates were not consistently higher than other fishing grounds. Villages with limited access to diverse or productive fishing grounds seemingly utilized FADs to better effect. Villagers believed FADs increased household income and nutrition, as well as providing a source of fish for community events. FADs were also perceived to increase intra-household conflict and reduce fishers' participation in community activities. FADs need to be placed within a broader rural development context and treated as another component in the diversified livelihoods of rural people; as with other livelihood options they bring trade-offs and risks.
    Schlagwörter Medicine ; R ; Science ; Q
    Thema/Rubrik (Code) 590
    Sprache Englisch
    Erscheinungsdatum 2014-01-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Artikel ; Online: Long-term trends in calcifying plankton and pH in the North Sea.

    Doug Beare / Abigail McQuatters-Gollop / Tessa van der Hammen / Marcel Machiels / Shwu Jiau Teoh / Jason M Hall-Spencer

    PLoS ONE, Vol 8, Iss 5, p e

    2013  Band 61175

    Abstract: Relationships between six calcifying plankton groups and pH are explored in a highly biologically productive and data-rich area of the central North Sea using time-series datasets. The long-term trends show that abundances of foraminiferans, ... ...

    Abstract Relationships between six calcifying plankton groups and pH are explored in a highly biologically productive and data-rich area of the central North Sea using time-series datasets. The long-term trends show that abundances of foraminiferans, coccolithophores, and echinoderm larvae have risen over the last few decades while the abundances of bivalves and pteropods have declined. Despite good coverage of pH data for the study area there is uncertainty over the quality of this historical dataset; pH appears to have been declining since the mid 1990s but there was no statistical connection between the abundance of the calcifying plankton and the pH trends. If there are any effects of pH on calcifying plankton in the North Sea they appear to be masked by the combined effects of other climatic (e.g. temperature), chemical (nutrient concentrations) and biotic (predation) drivers. Certain calcified plankton have proliferated in the central North Sea, and are tolerant of changes in pH that have occurred since the 1950s but bivalve larvae and pteropods have declined. An improved monitoring programme is required as ocean acidification may be occurring at a rate that will exceed the environmental niches of numerous planktonic taxa, testing their capacities for acclimation and genetic adaptation.
    Schlagwörter Medicine ; R ; Science ; Q
    Thema/Rubrik (Code) 333
    Sprache Englisch
    Erscheinungsdatum 2013-01-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Artikel ; Online: Increased Chlorophyll Levels in the Southern Caspian Sea Following an Invasion of Jellyfish

    Ahmet E. Kideys / Abolghaseem Roohi / Elif Eker-Develi / Frédéric Mélin / Doug Beare

    Research Letters in Ecology, Vol

    2008  Band 2008

    Abstract: A significant correlation was observed between satellite derived chlorophyll a (Chl a) concentrations and the biomass of the invasive comb jellyfish Mnemiopsis leidyi in the southern Caspian Sea. By consuming the herbivorous zooplankton, the predatory ... ...

    Abstract A significant correlation was observed between satellite derived chlorophyll a (Chl a) concentrations and the biomass of the invasive comb jellyfish Mnemiopsis leidyi in the southern Caspian Sea. By consuming the herbivorous zooplankton, the predatory ctenophore M. leidyi may have caused levels of Chl a to rise to very high values (∼9 mg m−3) in the southern Caspian Sea. There might also be several other factors concurrent with predation effects of M. leidyi influencing Chl a levels in this region, such as eutrophication and climatic changes which play major roles in nutrient, phytoplankton, and zooplankton variations. The decrease in pelagic fishes due to overfishing, natural, and anthropogenic impacts might have provided a suitable environment for M. leidyi to spread throughout this enclosed basin.
    Schlagwörter Science ; Q ; Biology (General) ; QH301-705.5 ; Ecology ; QH540-549.5
    Sprache Englisch
    Erscheinungsdatum 2008-01-01T00:00:00Z
    Verlag Hindawi Limited
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel ; Online: The Coral Triangle Atlas

    Annick Cros / Nurulhuda Ahamad Fatan / Alan White / Shwu Jiau Teoh / Stanley Tan / Christian Handayani / Charles Huang / Nate Peterson / Ruben Venegas Li / Hendra Yusran Siry / Ria Fitriana / Jamison Gove / Tomoko Acoba / Maurice Knight / Renerio Acosta / Neil Andrew / Doug Beare

    PLoS ONE, Vol 9, Iss 6, p e

    an integrated online spatial database system for improving coral reef management.

    2014  Band 96332

    Abstract: In this paper we describe the construction of an online GIS database system, hosted by WorldFish, which stores bio-physical, ecological and socio-economic data for the 'Coral Triangle Area' in South-east Asia and the Pacific. The database has been built ... ...

    Abstract In this paper we describe the construction of an online GIS database system, hosted by WorldFish, which stores bio-physical, ecological and socio-economic data for the 'Coral Triangle Area' in South-east Asia and the Pacific. The database has been built in partnership with all six (Timor-Leste, Malaysia, Indonesia, The Philippines, Solomon Islands and Papua New Guinea) of the Coral Triangle countries, and represents a valuable source of information for natural resource managers at the regional scale. Its utility is demonstrated using biophysical data, data summarising marine habitats, and data describing the extent of marine protected areas in the region.
    Schlagwörter Medicine ; R ; Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2014-01-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel: A major increase in snake pipefish (Entelurus aequoreus) in northern European seas since 2003: potential implications for seabird breeding success

    Harris, Michael P / Derek R. A. Rushton / Doug Beare / Hendrik Dörner / Judy Foster-Smith / Kevin Peach / Leif Nøttestad / Matthias Kloppmann / Reidar Toresen / Sarah Wanless

    Marine biology. 2007 May, v. 151, no. 3

    2007  

    Abstract: Since the early 2000s routine fish surveys have recorded increasing numbers of snake pipefish, Entelurus aequoreus, in the northeast Atlantic. Fishermen and divers have also commented on this increase and pipefish have started to appear in the diet of ... ...

    Abstract Since the early 2000s routine fish surveys have recorded increasing numbers of snake pipefish, Entelurus aequoreus, in the northeast Atlantic. Fishermen and divers have also commented on this increase and pipefish have started to appear in the diet of seabirds and other marine predators. This paper collates information from these diverse sources and assesses the current status of snake pipefish. We found compelling evidence of a dramatic increase in the abundance of snake pipefish starting around 2003 and continuing up to the present (2006) and a range expansion northwards to Spitzbergen and the Barents Sea. Since 2004 snake pipefish have been increasingly recorded in the diet of many species of seabird breeding in colonies around the coast of the UK, and in Norway, Iceland and the Faeroe Islands. Information on the nutrient value of snake pipefish is currently lacking but their rigid, bony structure makes them difficult for young seabirds to swallow and there are numerous records of chicks choking to death. Thus, in the case of avian predators during the breeding season, it appears unlikely that increased abundance of snake pipefish will provide a useful alternative prey. The reason for the rapid and dramatic increase in numbers of snake pipefish is currently unclear but such events are characteristic of marine ecosystems and will almost certainly have an effect on food web dynamics.
    Schlagwörter breeding ; breeding season ; chicks ; coasts ; death ; deglutition ; diet ; Entelurus aequoreus ; fish ; fishermen ; food webs ; marine ecosystems ; nutritive value ; predators ; reproductive success ; seabirds ; surveys ; Atlantic Ocean ; Barents Sea ; Faroe Islands ; Iceland ; Norway ; United Kingdom
    Sprache Englisch
    Erscheinungsverlauf 2007-05
    Umfang p. 973-983.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1117-4
    ISSN 1432-1793 ; 0025-3162
    ISSN (online) 1432-1793
    ISSN 0025-3162
    DOI 10.1007/s00227-006-0534-7
    Datenquelle NAL Katalog (AGRICOLA)

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  8. Artikel: Increased Chlorophyll Levels in the Southern Caspian Sea Following an Invasion of Jellyfish

    Ahmet E. Kideys / Abolghaseem Roohi / Elif Eker-Develi / Fré / dé / ric Mé / lin / Doug Beare

    Abstract: A significant correlation was observed between satellite derived chlorophyll a (Chl a) concentrations and the biomass of the invasive comb jellyfish Mnemiopsis leidyi in the southern Caspian Sea. By consuming the herbivorous zooplankton, the predatory ... ...

    Abstract A significant correlation was observed between satellite derived chlorophyll a (Chl a) concentrations and the biomass of the invasive comb jellyfish Mnemiopsis leidyi in the southern Caspian Sea. By consuming the herbivorous zooplankton, the predatory ctenophore M. leidyi may have caused levels of Chl a to rise to very high values (∼9 mg m-3) in the southern Caspian Sea. There might also beseveral other factors concurrent with predation effects ofM. leidyi influencing Chl alevels in this region, such as eutrophication and climatic changeswhich play major roles in nutrient, phytoplankton, and zooplanktonvariations. The decrease in pelagic fishes due to overfishing,natural, and anthropogenic impacts might have provided a suitableenvironment for M. leidyi to spread throughoutthis enclosed basin.
    Dokumenttyp Artikel
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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