Micronekton diel migration, community composition and trophic position within two biogeochemical provinces of the South West Indian Ocean: Insight from acoustics and stable isotopes

被引:25
作者
Annasawmy, P. [1 ,2 ]
Ternon, J. F. [1 ]
Marsac, F. [1 ,2 ]
Cherel, Y. [3 ]
Behagle, N. [4 ]
Roudaut, G. [4 ]
Lebourges-Dhaussy, A. [4 ]
Demarcq, H. [1 ]
Moloney, C. L. [2 ]
Jaquemet, S. [5 ]
Menard, F. [6 ]
机构
[1] IFREMER, CNRS, UM2, UMR MARBEC 248,IRD, Ave Jean Monnet,CS 30171, F-34203 Sete, France
[2] Univ Cape Town, Dept Biol Sci, Private Bag X3, ZA-7701 Cape Town, South Africa
[3] Univ La Rochelle, CNRS, UMR7372, Ctr Etud Biol Chize, F-79360 Villiers En Bois, France
[4] UBO, CNRS, UMR LEMAR 195, IRD, Campus Ifremer,BP 70, F-29280 Plouzane, France
[5] Univ Reunion, UMR ENTROPIE, CNRS, IRD, Ave Rene Cassin CS92003, F-97744 St Denis 9, Reunion, France
[6] Univ Toulon & Var, Aix Marseille Univ, CNRS, IRD,MIO, Marseille, France
关键词
Micronekton; Diel vertical migration; Indian South Subtropical Gyre; East African Coastal province; Trophic level; MESOSCALE FEATURES; MOZAMBIQUE CHANNEL; VERTICAL-DISTRIBUTION; MESOPELAGIC FISHES; MYCTOPHID FISHES; NORTH-ATLANTIC; EQUATORIAL ATLANTIC; RESPIRATORY CARBON; FEEDING ECOLOGY; YELLOWFIN TUNA;
D O I
10.1016/j.dsr.2018.07.002
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Spatial distribution, community composition and trophic roles of micronekton (crustaceans, fishes and squids) were investigated in the Indian South Subtropical Gyre (ISSG) province and the East African Coastal province (EAFR), by combining acoustic surveys, mid-water trawls and stable isotope analyses from scientific cruises conducted in 2009 and 2010. Mesopelagic micronekton performed diel vertical migrations in both provinces, from deep (400-740 m) to surface (0-200 m) layers at dusk and in the opposite direction at dawn, with some species migrating below 740 m. The EAFR province was more dynamic than the oligotrophic ISSG province, with enhanced eddy activity and enhanced yearly productivity. The active enrichment mechanisms in the EAFR, in terms of available primary production, led to high micronekton acoustic density (as a proxy of micronekton abundance) and large micronekton weight and abundance estimates from trawl data. Particulate organic matter in the EAFR exhibited greater enrichment in C-13 and N-15 compared to the ISSG and, consequently, tissues of selected micronekton organisms in the EAFR were more enriched in N-15 (higher delta N-15 values). In both provinces, micronekton encompassed a wide range of isotopic niches, with large overlaps between species. Micronekton and swordfish in the EAFR had an overlapping range of delta N-15 values, contrasting with the ISSG province where swordfish were two trophic levels higher than the sampled micronekton. Our results provide some evidence that the combined action of riverine input and the dynamics of eddies might influence productivity in the EAFR, and hence the abundance of micronekton and the enrichment of tissues in N-15, compared to the oligotrophic ISSG province.
引用
收藏
页码:85 / 97
页数:13
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