Study ID 452

Year-to-year dynamics of total nekton biomass (thous. tons) in the upper epipelagic of the North-West Pacific in June-July of 2000s

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Realm: Marine
Climate: Temperate
Biome: Temperate shelf and seas ecoregions
Central latitude: 47.000000
Central longitude: 160.000000
Duration: 8 years, from 2004 to 2012

100 records

13 distinct species

Across the time series Boreoteuthis borealis is the most frequently occurring species

Citation(s):

Khoruzhiy, A. A. & Naydenko, S. V. (2014) Species structure and year-to-year dynamics of nekton biomass in the upper epipelagic layer of the Pacific waters at Kuril Islands in summer periods of the 2000s. Izv. TINRO, 176, 16–36.

Methods

Data on the species composition and biomass of nekton collected during the expeditions of TINRO-center in the North-West Pacific waters at Kuril Islands in June-July 2004-2012 was the material for this work. During this period of research 8 standard trawl surveys were carried out in the upper epipelagic layer (0?50 m) of this area. These surveys have continued a series of long-term field research of Pacific salmon and their environment nekton (fish squid) which was launched in the region in the 1980s. Averaging of the received information carried out by standard biostatistical areas (Shuntov 1986 1988;. Volvenko 1998 2003; Nekton ... 2005; Macrofauna ... 2012). Trawls were performed on the same type scientific research vessels TINRO and Professor Kaganovsky by midwater trawls 80/396 m with fine-meshed insertion. Average trawling speed was 46 with an average area of the trawl fishing on 0417 km2 for 1 h. Removal and retention of flap on the surface are achieved when the length of the warp was 238-354 m on average 278.6 m. As a spacer device used pterygopalatine-tapered planks 6.0 m2 and weighing 1300 kg. trawl Disclosure determined by sensor of the apparatus SIMRAD FS 20/25. Vertical disclosure was on the average 33.1 m horizontal - 48.5 m. Abundance and biomass of each species or group of Nekton per unit area - square kilometer (ind. / km2 kg / km2.) calculated according to the formula for each trawl station below <...>. This method of calculation is different from the classic square (Aksyutina 1968) only by the introduction of two amendments p and the k compensating underestimation of aquatic organisms. In our case k - is ?ku? trawl catchability coefficient applied individually for each type of aquatic organisms according to the accepted practice in similar ecosystem surveys gradations (Volvenko 1998; Nekton ... 2005; Macrofauna ... 2012). All tables graphs and figures used in the work were built based on Nekton database TINRO center. The species names of fish were checked and corrected according to the classification adopted by Eshmayeru (http://research.calacademy.org/research/ichthyology/catalog/fishcatmain.asp) squid list was refined by KN Nesis (1982). Biomass of mesopelagic species committing vertical migrations at night (in particular all myctophids and some squid) have been translated only for a night trawling. Original text: ?????????? ??? ?????? ????????? ?????? ?? ??????? ? ???????? ??????? ????????? ? ??????????? ?????-?????? ? ????????????? ????? ?????? ?????? ? ????-???? 2004?2012 ??. ?? ????????? ?????? ???????????? ? ??????? ???????????? ????????????? ??? ?????? ?????? ???? ????????? 8 ??????????? ??????????? ??????. ??? ?????? ?????????? ??? ??????????? ?????????????? ???????????? ????????????? ??????? ? ?? ?????????? ????????? (??? ?????????) ??????? ? ?????? ?????? ? 1980-? ??. ?????????? ?????????? ?????????? ????????? ?? ??????????? ????????????????? ??????? (?????? ? ??. 1986 1988; ???????? 1998 2003; ?????? ? 2005; ?????????? ? 2012). ???????? ??????????? ?? ?????????? ??? ??????? ? ?????????? ???????????? ?????????????? ?????? 80/396 ? ? ???????????? ???????? ? ?????. ???????? ???????? ? ??????? ????????? 46 ?? ??? ??????? ??????? ?????? ????? ?? 1 ? 0417 ??2. ????????? ? ????????? ????? ?? ??????????? ??????????? ??? ????? ???????????? ?????? 238?354 ? ? ??????? 2786 ?. ? ???????? ????????? ??????? ?????????????? ??????????-?????????? ????? ???????? 60 ?2 ? ?????? 1300 ?? ??????. ????????? ????? ???????????? ???????? ??????? SIMRAD FS 20/25. ???????????? ????????? ? ??????? ?????????? 331 ? ?????????????? ? 485 ?. ??????????? ? ???????? ??????? ???? ??? ?????? ??????? ?? ??????? ??????????? ??????? ? ?????????? ???????? (???./??2 ? ??/??2) ? ??? ?????? ???????? ??????? ??????????? ?? ???????? ????. ???? ?????? ??????? ?????????? ?? ????????????? ???????????? (???????? 1968) ?????? ????????? ???? ???????? p ? k ?????????????? ???????? ????????????. ? ????? ?????? k ? ??? ?? ??????????? ??????????? ????? ?????????? ????????????? ??? ??????? ???? ???????????? ???????? ???????? ? ???????? ??????????? ???????????? ?????? ????????? (???????? 1998; ?????? ? 2005; ?????????? ? 2012). ??? ??????? ??????? ? ??????? ?????????????? ? ?????? ???? ????????? ?? ?????????? ????????? ???? ?????? ?????-??????. 2. ??????? ???????? ??? ??????????? ? ?????????? ? ???????????? ? ?????????????? ???????? ?? ???????? (Eschmeyer W.N. (ed). Genera species references (http://research.calacademy.org/research/ichthyology/catalog/fishcatmain.asp). Electronic version accessed 2013) ?????? ????????? ????????? ?? ?.?. ?????? (1982). ???????? ???? ???????????????? ????? ??????????? ???????????? ???????? ? ?????? ????? ????? (? ????????? ??? ????????? ? ????????? ????????) ???? ??????????? ?????? ?? ?????? ?????????. Unit of abundance = NA, Unit of biomass = Weight