Skip to content

Research at St Andrews

Seamount influences on mid-water shrimps (Decapoda) and Gnathophausiids (Lophogastridea) of the South-West Indian ridge

Research output: Contribution to journalArticle

Abstract

Maintenance of often-observed elevated levels of pelagic diversity and biomass on seamounts, that are of relevance to conservation and fishery management, involves complex interactions between physical and biological variables that remain poorly understood. To untangle these biophysical processes we explore factors influencing the distribution of epi- and meso-pelagic (0–1000 m) micronektonic crustaceans (>15 mm; order Lophogastridea, family Gnathophausiidea; and order Decapoda) on and off seamounts along the South West Indian Ridge (SWIR, 27° to 42°S) and on a seamount off the Madagascar Ridge (31.6°S, 42.8°E). Thirty-one species of micronektic crustaceans were caught using mid-water trawls within the study are but there was no apparent latitude-related patterns in species richness or abundance. Species richness predicted by rarefraction curves and numerical abundance was highest in the vicinity (<1 km) of seamounts (species richness: 15 to 21; abundance: 10±2 to 20±1 ind.10−3 m−1) compared with over the abyssal plains and ridge slopes (species richness: 9.2–9.9; abundance: 24±2 to 79±8 ind.10−3 m−1). Multivariate analysis of assemblage composition revealed significant groupings of individual net samples with respect to whether the sample was on or off a seamount and hydrographic region, but not with time of sampling relative to diel cycle (day/night or dawn) or depth of sampling (0–500, 500-800,>800 m). The dominant species assemblage comprised the shrimps Systellaspis debilis (37%) and Sergia prehensilis (34%), and was restricted to seamounts on the subtropical SWIR. Our observations suggest that the ‘oasis effect’ of seamounts conventionally associated with higher trophic levels is also applicable to pelagic micronektic crustaceans at lower trophic levels. We suggest that the enhanced biomass and species richness attributed is due to ‘habitat enrichment’, whereby seamounts provide favourable habitats for both pelagic and bentho-pelagic mid-water crustaceans.
Close

Details

Original languageEnglish
Pages (from-to)85-97
Number of pages13
JournalDeep Sea Research Part II: Topical Studies in Oceanography
Volume136
Early online date27 May 2015
DOIs
Publication statusPublished - Feb 2017

    Research areas

  • Conservation, Indian ocean, Decapod shrimp, Gnathophausia, Deep sea

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea

    Seco, J., Xavier, J. C., Coelho, J. P., Pereira, B., Tarling, G., Pardal, M. A., Bustamante, P., Stowasser, G., Brierley, A. S. & Pereira, M. E., Apr 2019, In : Environmental Pollution. 247, p. 332-339 8 p.

    Research output: Contribution to journalArticle

  2. Internal lee waves and baroclinic bores over a tropical seamount shark ‘hot-spot’

    Hosegood, P. J., Nimmo-Smith, W. A. M., Proud, R., Adams, K. & Brierley, A. S., Mar 2019, In : Progress in Oceanography. 172, p. 34-50 17 p.

    Research output: Contribution to journalArticle

  3. Use of micronekton data and models to improve ecology of top predators

    Proud, R. & Brierley, A. S., 30 Nov 2018, Zenodo. 23 p.

    Research output: Book/ReportCommissioned report

Related by journal

  1. Beluga whales in the western Beaufort Sea: current state of knowledge on timing, distribution, habitat use and environmental drivers

    Stafford, K. M., Ferguson, M. C., Hauser, D. D. W., Okkonen, S. R., Berchok, C. L., Citta, J. J., Clarke, J. T., Garland, E. C., Jones, J. & Suydam, R. S., Jun 2018, In : Deep Sea Research Part II: Topical Studies in Oceanography. 152, p. 182-194

    Research output: Contribution to journalArticle

  2. Distribution, abundance and habitat use of deep diving cetaceans in the North-East Atlantic

    Rogan, E., Cañadas, A., Macleod, K., Santos, M. B., Mikkelsen, B., Uriarte, A., Van Canneyt, O., Antonio Vázquez, J. & Hammond, P. S., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 8-19

    Research output: Contribution to journalArticle

  3. Estimating cetacean density and abundance in the Central and Western Mediterranean Sea through aerial surveys: implications for management

    Panigada, S., Lauriano, G., Donovan, G., Pierantonio, N., Cañadas, A., Vázquez, J. A. & Burt, L., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 41-58 18 p.

    Research output: Contribution to journalArticle

  4. Grey and harbour seals in France: distribution at sea, connectivity and trends in abundance at haulout sites

    Vincent, C., Huon, M., Caurant, F., Dabin, W., Deniau, A., Dixneuf, S., Dupuis, L., Elder, J-F., Fremau, M-H., Hassani, S., Hemon, A., Karpouzopoulos, J., Lefeuvre, C., McConnell, B. J., Moss, S. E. W., Provost, P., Spitz, J., Turpin, Y. & Ridoux, V., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 294-305

    Research output: Contribution to journalArticle

  5. Harbour porpoise distribution can vary at small spatiotemporal scales in energetic habitats

    Benjamins, S., van Geel, N., Hastie, G., Elliott, J. & Wilson, B., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 191-202 12 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Deep Sea Research Part II: Topical Studies in Oceanography (Journal)

    Patrick Miller (Editor)
    2007 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

ID: 191125146