Deep-sea amphipod community structure across abyssal to hadal depths in the Peru-Chile and Kermadec trenches

Toyonobu Fujii*, Niamh M. Kilgallen, Ashley A. Rowden, Alan J. Jamieson

*Corresponding author for this work

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Deep-sea necrophagous amphipods were sampled from 5 stations across the abyssal and hadal zones (4602 to 8074 m depth) of the Peru-Chile Trench (SE Pacific Ocean) and combined with comparative data taken from 7 stations at corresponding depths (4329 to 7966 m) in the Kermadec Trench (SW Pacific Ocean) to investigate the diversity and structure of the amphipod communities in the South Pacific Ocean. Four distinctive community groups were identified and their relationships with environmental factors were examined using a total of 6 variables (latitude, longitude, hydrostatic pressure, primary productivity, temperature, sediment characteristics), of which pressure (i.e. depth) and longitudinal (i.e. geographic isolation or dispersal distance) gradients best explained the observed variation in the amphipod assemblage structure. The composition of the abyssal community was dominated by cosmopolitan species belonging to the genera Paralicella, Abyssorchomene and Eurythenes. The 2 most dissimilar groups corresponded to the sites at deeper, hadal depths in both trenches: the hadal Kermadec sites (6890 to 7966 m), dominated by Hirondellea dubia, and the hadal Peru-Chile sites (7050 to 8074 m), characterised by the presence of E. gryllus and 3 undescribed Hirondellea species. The number of amphipod species decreased significantly with increasing depth across all the sampling stations, but the decreasing trend diverged markedly between the 2 hadal trench communities, possibly due to the stark contrast in overlying surface productivity between the 2 regions. Thus the environmental forcing exerted by the pressure and longitudinal gradients on the scavenging amphipod community structure is likely to be further influenced by the surface production and associated flux of food material to the trenches.

Original languageEnglish
Pages (from-to)125-138
Number of pages14
JournalMarine Ecology Progress Series
Volume492
DOIs
Publication statusPublished - 2013

Keywords

  • amphipoda
  • Hadal zone
  • community structure
  • Peru-Chile Trench
  • Kermadec Trench
  • Pacific Ocean
  • Central North Pacific
  • scavenging amphipods
  • eurythenes-gryllus
  • necrophagous amphipod
  • Atlantic-Ocean
  • patterns
  • crustacea
  • pressure
  • zone
  • lysianassoidea

Cite this

Deep-sea amphipod community structure across abyssal to hadal depths in the Peru-Chile and Kermadec trenches. / Fujii, Toyonobu; Kilgallen, Niamh M.; Rowden, Ashley A.; Jamieson, Alan J.

In: Marine Ecology Progress Series, Vol. 492, 2013, p. 125-138.

Research output: Contribution to journalArticle

Fujii, Toyonobu ; Kilgallen, Niamh M. ; Rowden, Ashley A. ; Jamieson, Alan J. / Deep-sea amphipod community structure across abyssal to hadal depths in the Peru-Chile and Kermadec trenches. In: Marine Ecology Progress Series. 2013 ; Vol. 492. pp. 125-138.
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abstract = "Deep-sea necrophagous amphipods were sampled from 5 stations across the abyssal and hadal zones (4602 to 8074 m depth) of the Peru-Chile Trench (SE Pacific Ocean) and combined with comparative data taken from 7 stations at corresponding depths (4329 to 7966 m) in the Kermadec Trench (SW Pacific Ocean) to investigate the diversity and structure of the amphipod communities in the South Pacific Ocean. Four distinctive community groups were identified and their relationships with environmental factors were examined using a total of 6 variables (latitude, longitude, hydrostatic pressure, primary productivity, temperature, sediment characteristics), of which pressure (i.e. depth) and longitudinal (i.e. geographic isolation or dispersal distance) gradients best explained the observed variation in the amphipod assemblage structure. The composition of the abyssal community was dominated by cosmopolitan species belonging to the genera Paralicella, Abyssorchomene and Eurythenes. The 2 most dissimilar groups corresponded to the sites at deeper, hadal depths in both trenches: the hadal Kermadec sites (6890 to 7966 m), dominated by Hirondellea dubia, and the hadal Peru-Chile sites (7050 to 8074 m), characterised by the presence of E. gryllus and 3 undescribed Hirondellea species. The number of amphipod species decreased significantly with increasing depth across all the sampling stations, but the decreasing trend diverged markedly between the 2 hadal trench communities, possibly due to the stark contrast in overlying surface productivity between the 2 regions. Thus the environmental forcing exerted by the pressure and longitudinal gradients on the scavenging amphipod community structure is likely to be further influenced by the surface production and associated flux of food material to the trenches.",
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T1 - Deep-sea amphipod community structure across abyssal to hadal depths in the Peru-Chile and Kermadec trenches

AU - Fujii, Toyonobu

AU - Kilgallen, Niamh M.

AU - Rowden, Ashley A.

AU - Jamieson, Alan J.

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N2 - Deep-sea necrophagous amphipods were sampled from 5 stations across the abyssal and hadal zones (4602 to 8074 m depth) of the Peru-Chile Trench (SE Pacific Ocean) and combined with comparative data taken from 7 stations at corresponding depths (4329 to 7966 m) in the Kermadec Trench (SW Pacific Ocean) to investigate the diversity and structure of the amphipod communities in the South Pacific Ocean. Four distinctive community groups were identified and their relationships with environmental factors were examined using a total of 6 variables (latitude, longitude, hydrostatic pressure, primary productivity, temperature, sediment characteristics), of which pressure (i.e. depth) and longitudinal (i.e. geographic isolation or dispersal distance) gradients best explained the observed variation in the amphipod assemblage structure. The composition of the abyssal community was dominated by cosmopolitan species belonging to the genera Paralicella, Abyssorchomene and Eurythenes. The 2 most dissimilar groups corresponded to the sites at deeper, hadal depths in both trenches: the hadal Kermadec sites (6890 to 7966 m), dominated by Hirondellea dubia, and the hadal Peru-Chile sites (7050 to 8074 m), characterised by the presence of E. gryllus and 3 undescribed Hirondellea species. The number of amphipod species decreased significantly with increasing depth across all the sampling stations, but the decreasing trend diverged markedly between the 2 hadal trench communities, possibly due to the stark contrast in overlying surface productivity between the 2 regions. Thus the environmental forcing exerted by the pressure and longitudinal gradients on the scavenging amphipod community structure is likely to be further influenced by the surface production and associated flux of food material to the trenches.

AB - Deep-sea necrophagous amphipods were sampled from 5 stations across the abyssal and hadal zones (4602 to 8074 m depth) of the Peru-Chile Trench (SE Pacific Ocean) and combined with comparative data taken from 7 stations at corresponding depths (4329 to 7966 m) in the Kermadec Trench (SW Pacific Ocean) to investigate the diversity and structure of the amphipod communities in the South Pacific Ocean. Four distinctive community groups were identified and their relationships with environmental factors were examined using a total of 6 variables (latitude, longitude, hydrostatic pressure, primary productivity, temperature, sediment characteristics), of which pressure (i.e. depth) and longitudinal (i.e. geographic isolation or dispersal distance) gradients best explained the observed variation in the amphipod assemblage structure. The composition of the abyssal community was dominated by cosmopolitan species belonging to the genera Paralicella, Abyssorchomene and Eurythenes. The 2 most dissimilar groups corresponded to the sites at deeper, hadal depths in both trenches: the hadal Kermadec sites (6890 to 7966 m), dominated by Hirondellea dubia, and the hadal Peru-Chile sites (7050 to 8074 m), characterised by the presence of E. gryllus and 3 undescribed Hirondellea species. The number of amphipod species decreased significantly with increasing depth across all the sampling stations, but the decreasing trend diverged markedly between the 2 hadal trench communities, possibly due to the stark contrast in overlying surface productivity between the 2 regions. Thus the environmental forcing exerted by the pressure and longitudinal gradients on the scavenging amphipod community structure is likely to be further influenced by the surface production and associated flux of food material to the trenches.

KW - amphipoda

KW - Hadal zone

KW - community structure

KW - Peru-Chile Trench

KW - Kermadec Trench

KW - Pacific Ocean

KW - Central North Pacific

KW - scavenging amphipods

KW - eurythenes-gryllus

KW - necrophagous amphipod

KW - Atlantic-Ocean

KW - patterns

KW - crustacea

KW - pressure

KW - zone

KW - lysianassoidea

U2 - 10.3354/meps10489

DO - 10.3354/meps10489

M3 - Article

VL - 492

SP - 125

EP - 138

JO - Marine Ecology Progress Series

JF - Marine Ecology Progress Series

SN - 0171-8630

ER -