GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Document type
Language
Years
back to result list
1
Online Resource
Online Resource
The absence from sharks from abyssal regions of the world's oceans (2006)
Details Availability
In: Royal Society (London), Proceedings of the Royal Society of London. Series B, Biological sciences, London : The Royal Society, 1905, (2006), 1471-2954
In: year:2006
In: extent:7
Description / Table of Contents: The oceanic abyss (depths greater than 3000m), one of the largest environments on the planet, is characterized by absence of solar light, high pressures and remoteness from surface food supply necessitating special molecular, physiological, behavioural and ecological adaptations of organisms that live there. Sampling by trawl, baited hooks and cameras we show that the Chondrichthyes (sharks, rays and chimaeras) are absent from, or very rare in this region. Analysis of a global data set shows a trend of rapid disappearance of chondrichthyan species with depth when compared with bony fishes. Sharks, apparently well adapted to life at high pressures are conspicuous on slopes down to 2000m including scavenging at food falls such as dead whales. We propose that they are excluded from the abyss by high-energy demand, including an oil-rich liver for buoyancy, which cannot be sustained in extreme oligotrophic conditions. Sharks are apparently confined to ca 30% of the total ocean and distribution of many species is fragmented around sea mounts, ocean ridges and ocean margins. All populations are therefore within reach of human fisheries, and there is no hidden reserve of chondrichthyan biomass or biodiversity in the deep sea. Sharks may be more vulnerable to over-exploitation than previously thought.
Type of Medium: Online Resource
Pages: 7 , graph. Darst.
ISSN: 1471-2954
DOI: 10.1098/rspb.2005.3461
Language: English
Location Call Number Limitation Availability
BibTip Others were also interested in ...
GEOMAR CATALOGUE
Link to Library Catalog
get availability status
Associated Volumes
  • 2
    Online Resource
    Online Resource
    Influence of sexual selection and feeding functional morphology on diversification rate of parrotfishes (Scaridae) (2009)
    Details Availability
    In: Royal Society (London), Proceedings of the Royal Society of London. Series B, Biological sciences, London : The Royal Society, 1905, 276(2009), 1672, Seite 3439-3446, 1471-2954
    In: volume:276
    In: year:2009
    In: number:1672
    In: pages:3439-3446
    Description / Table of Contents: Scaridae (parrotfishes) is a prominent clade of 96 species that shape coral reef communities worldwide through their actions as grazing herbivores. Phylogenetically nested within Labridae, the profound ecological impact and high species richness of parrotfishes suggest that their diversification and ecological success may be linked. Here, we ask whether parrotfish evolution is characterized by a significant burst of lineage diversification and whether parrotfish diversity is shaped more strongly by sexual selection or modifications of the feeding mechanism. We first examined scarid diversification within the greater context of labrid diversity. We used a supermatrix approach for 252 species to propose the most extensive phylogenetic hypothesis of Labridae to date, and time-calibrated the phylogeny with fossil and biogeographical data. Using divergence date estimates, we find that several parrotfish clades exhibit the highest diversification rates among all labrid lineages. Furthermore, we pinpoint a rate shift at the shared ancestor of Scarus and Chlorurus, a scarid subclade characterized by territorial behaviour and strong sexual dichromatism, suggesting that sexual selection was a major factor in parrotfish diversification. Modifications of the pharyngeal and oral jaws that happened earlier in parrotfish evolution may have contributed to this diversity by establishing parrotfishes as uniquely capable reef herbivores.
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1471-2954
    URL: http://rspb.royalsocietypublishing.org/content/276/1672/3439.full.pdf+html
    DOI: 10.1098/rspb.2009.0876
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 3
    Online Resource
    Online Resource
    Costly major histocompatibility complex signals produced only by reproductively active males, but not females, must be validated by a 'maleness signal' in three-spined sticklebacks (2010)
    Details Availability
    In: Royal Society (London), Proceedings of the Royal Society of London. Series B, Biological sciences, London : The Royal Society, 1905, 277(2010), 1680, Seite 391-398, 1471-2954
    In: volume:277
    In: year:2010
    In: number:1680
    In: pages:391-398
    Description / Table of Contents: Olfactory information about individual major histocompatibility complex (MHC) immune genotypes is important for mate choice in several species. For example, during the mate choice decisions of three-spined sticklebacks, females assess males on the basis of odour cues that convey information about their MHC diversity. Here, we show that an additional 'maleness' signal is needed to validate the MHC signal. Furthermore, using interaction between natural odour of sticklebacks and synthetic MHC-ligand peptides, we show that MHC signals are conditional on the reproductive state in males. By contrast, we find that gravid females do not produce such signals. Since MHC olfactory signals relevant to mate choice decisions are conditional upon gender and reproductive state, we suggest that their manufacture is likely to be costly to senders, and therefore, potentially conditional on the health/parasitization status of the sender. We hypothesize that shedding of peptide-MHC complexes compromises immune function, selecting against unconditional use of these signals.
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1471-2954
    URL: http://rspb.royalsocietypublishing.org/content/277/1680/391.abstract
    DOI: 10.1098/rspb.2009.1501
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 4
    Online Resource
    Online Resource
    Multi-level trophic cascades in a heavily exploited open marine ecosystem (2008)
    Details Availability
    In: Royal Society (London), Proceedings of the Royal Society of London. Series B, Biological sciences, London : The Royal Society, 1905, (2008), 1471-2954
    In: year:2008
    In: extent:9
    Type of Medium: Online Resource
    Pages: 9 , graph. Darst
    ISSN: 1471-2954
    DOI: 10.1098/rspb.2007.1752
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 5
    Online Resource
    Online Resource
    Lifetime reproductive success is maximized with optimal major histocompatibility complex diversity (2008)
    Details Availability
    In: Royal Society (London), Proceedings of the Royal Society of London. Series B, Biological sciences, London : The Royal Society, 1905, (2008), 1471-2954
    In: year:2008
    In: extent:12
    Description / Table of Contents: Individual diversity at the major histocompatibility complex (MHC) is predicted to be optimal at intermediate rather than at maximal levels. We showed previously in sticklebacks that an intermediate MHC diversity is predominant in natural populations and provides maximal resistance in experimental multiple parasite infections in the laboratory. However, what counts ultimately is the lifetime reproductive success (LRS). Here, we measured LRS of six laboratory-bred sib-groupsto minimize the influence of non-MHC genesthree-spined sticklebacks (Gasterosteus aculeatus) during their entire breeding period, each in a seminatural enclosure in the lake of their parents, where they were exposed to the natural spectrum of parasites. We collected developing clutches at regular intervals and determined parenthood for a representative number of eggs (2279 in total) per clutch with 18 microsatellites. Both males and females with an intermediate MHC class IIB variant number had the highest LRS. The mechanistic link of MHC diversity and LRS differed between the sexes: in females, we found evidence for a trade-off between number of eggs and immunocompentence, whereas in males this correlation was concealed by different timing strategies of reproduction.
    Type of Medium: Online Resource
    Pages: 12 , graph. Darst.
    ISSN: 1471-2954
    DOI: 10.1098/rspb.2008.1466
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...