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Structural changes in the Barents Sea fish community 2004-2009

BarEcoRe AM Herdla 4-6 Oct 2011 WP1: Fish and benthos communities, past changes and regime shifts. Structural changes in the Barents Sea fish community 2004-2009. Fossheim M, Primicerio R, Johannesen E, Dolgov A and Aschan M. Barents Sea fish. Objective

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Structural changes in the Barents Sea fish community 2004-2009

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  1. BarEcoRe AM Herdla 4-6 Oct 2011 WP1: Fish and benthos communities, past changes and regime shifts Structural changes in the Barents Sea fish community 2004-2009 Fossheim M, Primicerio R, Johannesen E, Dolgov A and Aschan M

  2. Barents Sea fish • Objective • Document the spatial pattern and temporal changes in the Barents Sea fish community and relate to environmental parameters • Spatial patterns • Fish assemblages in 2007 • Temporal change • In the years 2004-2009 (ecosystem survey) • From 1992-2004 – adding to Aschan et al (shrimp survey)

  3. Barents Sea fish Given the recent warming in the Barents Sea (20042009), are there any structural changes in the fish community? • Hyp0: There are no structural changes in the BS in the period 2004-2009 • Hyp1: Southern species are moving northward • Hyp2: Southern communities are moving northward • Hyp 3: P/D ratio is increasing = Pelagic species increasing vs demersal species

  4. Barents Sea fish 2007 High Arctic South-west deep Central and east

  5. Barents Sea fish 2007 Gradient in species density?

  6. Barents Sea fish DA 2007 Clu ana 2007

  7. Barents Sea fish DA 2007 DA biplot 2007 Preliminary results – unweighted average

  8. Barents Sea fish Yellow and green groups increasing; red and blue group decreasing? 2004 2005 2006 2007 2008 2009

  9. depth 2 1 2 ma_be my_spp mer_me 2006 ba_spi di_ba gai_ar ar_gl 1 lat sal ph_bl co_sa 1 re_hi se_me co_mi mi_po et_spi ag_ca am_hy an_de ra_fy lip_spp se_juv di_ba zoa_spp eu_de tr_ny ma_mu ze_no 2005 ma_mu 2007 cy_mc se_juv my_sc tr_pi le_de temp ar_at se_no po_po 0 0 en_ci am_ra le_wh 2006 2004 2007 an_me ga_ac gy_tr mi_po hi_hi ul_ol 2008 my_spp le_ma ic_spp ch_mo hi_pl cy_lu tr_mu lip_spp co_mi se_vi re_hi ra_fy CCA2 0 CCA2 ar_at le_ma li_li po_vi le_de an_mi me_ae tr_es lu_la lu_fa 2009 tr_ny an_mi eu_sp zoa_spp gl_cy ga_mo hi_pl pl_pl an_lu se_vi mi_ki me_ae gai_ar am_ra 2005 2004 br_br an_de se_no ga_mo gl_cy br_br co_sa tr_es se_me cy_lu et_spi lu_la am_sp eu_sp en_ci ma_be an_lu lo_pi lu_fa co_ru tr_mu mo_mo ic_spp po_vi ba_spi ph_bl tr_pi lon am_hy lo_pi mo_mo me_me me_me am_sp ch_mo le_ja an_me -1 ar_gl po_po ga_ac 2008 hi_hi mi_ki eu_de gy_tr di_li -1 ul_ol my_sc ar_sc ze_no li_li -1 -2 pl_pl ag_ca ar_sc -2 2009 -3 -2 -1 0 1 -2 -1 0 1 2 CCA1 CCA1 Barents Sea fish All habitat variables incl. Lat, lon, depth as covariates

  10. Barents Sea fish CCA1: Higher importance of warm-water species 2004-2005  2006-2009 Hyp1/2 can not be rejected (Hyp1/2: Southern species/communities are moving northward) 2 mer_me 2006 1 ag_ca di_ba eu_de ma_mu ze_no cy_mc se_juv my_sc tr_pi po_po le_wh 2007 an_me ga_ac gy_tr mi_po hi_hi ul_ol my_spp le_ma ic_spp cy_lu tr_mu lip_spp co_mi re_hi ra_fy CCA2 0 ar_at li_li po_vi le_de an_mi me_ae lu_la lu_fa tr_ny eu_sp zoa_spp gl_cy hi_pl pl_pl an_lu se_vi mi_ki gai_ar am_ra 2005 2004 an_de se_no ga_mo br_br co_sa tr_es se_me et_spi am_sp en_ci ma_be lo_pi co_ru ba_spi ph_bl am_hy mo_mo me_me ch_mo le_ja ar_gl 2008 di_li -1 ar_sc -2 2009 -2 -1 0 1 2 CCA1

  11. Barents Sea fish CCA2: Higher importance of shallower species? 2006-2007  2008-2009 Hyp 3 can not be rejected? (Hyp 3: P/D ratio is increasing = Pelagic species increasing vs demersal species) 2 mer_me 2006 1 ag_ca di_ba eu_de ma_mu ze_no cy_mc se_juv my_sc tr_pi po_po le_wh 2007 an_me ga_ac gy_tr mi_po hi_hi ul_ol my_spp le_ma ic_spp cy_lu tr_mu lip_spp co_mi re_hi ra_fy CCA2 0 ar_at li_li po_vi le_de an_mi me_ae lu_la lu_fa tr_ny eu_sp zoa_spp gl_cy hi_pl pl_pl an_lu se_vi mi_ki gai_ar am_ra 2005 2004 an_de se_no ga_mo br_br co_sa tr_es se_me et_spi am_sp en_ci ma_be lo_pi co_ru ba_spi ph_bl am_hy mo_mo me_me ch_mo le_ja ar_gl 2008 di_li -1 ar_sc -2 2009 -2 -1 0 1 2 CCA1

  12. Barents Sea fish Next: Which species are responsible for the warming trend? Species/species group (pelagics?) or communities? Artefact or true signal? Compare with previous studies (Aschan et al 1992-2004) 2 mer_me 2006 1 ag_ca di_ba eu_de ma_mu ze_no cy_mc se_juv my_sc tr_pi po_po le_wh 2007 an_me ga_ac gy_tr mi_po hi_hi ul_ol my_spp le_ma ic_spp cy_lu tr_mu lip_spp co_mi re_hi ra_fy CCA2 0 ar_at li_li po_vi le_de an_mi me_ae lu_la lu_fa tr_ny eu_sp zoa_spp gl_cy hi_pl pl_pl an_lu se_vi mi_ki gai_ar am_ra 2005 2004 an_de se_no ga_mo br_br co_sa tr_es se_me et_spi am_sp en_ci ma_be lo_pi co_ru ba_spi ph_bl am_hy mo_mo me_me ch_mo le_ja ar_gl 2008 di_li -1 ar_sc -2 2009 -2 -1 0 1 2 CCA1

  13. Barents Sea fish • The Barents Sea fish can be grouped into five assemblages • Central groups expanding? • The main biogeographical boundary is the Polar front • Hydrographic and bathymetric division – less important? • Temporal change? • Increasing importance of warm-water species in the last three years compared to earlier years • Include ecosystem survey for 2010?

  14. Barents Sea fish  Thank you for your attention Fossheim M, Primicerio R, Johannesen E, Dolgov A and Aschan M Structural changes in the Barents Sea fish community 2004-2009 In prep.

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