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PT J
AU Voss, R
Clemmesen, C
Baumann, H
Hinrichsen, HH
TI Baltic sprat larvae: coupling food availability, larval condition and
survival
SO MARINE ECOLOGY-PROGRESS SERIES
LA English
DT Article
DE Baltic Sea; sprat larvae; condition; food availability; mortality;
hydrodynamic modelling
ID COD GADUS-MORHUA; RNA-DNA RATIO; RNA/DNA RATIOS; NORTH-SEA; RECRUITMENT
SUCCESS; FISH LARVAE; GROWTH-RATE; LIFE STAGES; STOCK; FIELD
AB Eggs and larvae of Baltic sprat Sprattus sprattus L. were collected
during 14 cruises covering the spawning season in 2002 in Bornholm
Basin. Main egg and larval production was in April, with a second small
peak in June 2002. The in situ larval abundance was corrected for
transport processes by hydrodynamic model runs. Corrected larval
abundance estimates were compared to initial larval production to
derive an index of larval mortality. This index suggested a much higher
survival of summer-over spring-born sprat larvae, with pronounced
differences in survival for larvae > 11 mm. Independent evidence for
this survival pattern was gained by measured RNA:DNA ratios in sprat
larvae hatched from April to July 2002 and was linked to temporal
variability in potential prey abundance. We found higher mean but less
variable RNA:DNA ratios in spring- than in summer-born larvae,
indicating a strong selection for fast growth in April and May but a
less selective environment in June and July. Zooplankton data revealed
high naupliar concentrations of Acartia spp. (a key dietary component
of sprat) in April and May, but very low concentrations of larger prey
items such as copepodites or adults. In contrast, abundance of larger
prey increased considerably in June and July. The results suggest that
larger sprat (> 11 mm) in April and May 2002 may have been food limited
and, therefore, had lower rates of survival, supporting the underlying
hypothesis of size-specific, temporally limited 'windows of survival'
linked to the availability of suitable prey.
C1 Univ Kiel, Leibniz Inst Marine Sci, D-24105 Kiel, Germany.
Univ Hamburg, Inst Hydrobiol & Fisheries, D-22767 Hamburg, Germany.
RP Voss, R, Univ Kiel, Leibniz Inst Marine Sci, Dusternbrooker Weg 20,
D-24105 Kiel, Germany.
EM rvoss@ifm-geomar.de
NR 67
TC 0
PU INTER-RESEARCH
PI OLDENDORF LUHE
PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY
SN 0171-8630
J9 MAR ECOL-PROGR SER
JI Mar. Ecol.-Prog. Ser.
PY 2006
VL 308
BP 243
EP 254
PG 12
SC Ecology; Marine & Freshwater Biology
GA 023QO
UT ISI:000236141500020
ER
PT J
AU Koster, FW
Mollmann, C
Hinrichsen, HH
Wieland, K
Tomkiewicz, J
Kraus, G
Voss, R
Makarchouk, A
MacKenzie, BR
St John, MA
Schnack, D
Rohlf, N
Linkowski, T
Beyer, JE
TI Baltic cod recruitment - the impact of climate variability on key
processes
SO ICES JOURNAL OF MARINE SCIENCE
LA English
DT Article
DE eastern Baltic cod; egg survival; hydrography; larval prey
availability; predation; recruitment
ID GADUS-MORHUA L.; SPRAT SPRATTUS-SPRATTUS; YOLK-SAC LARVAE;
VERTICAL-DISTRIBUTION; ENVIRONMENTAL VARIABILITY; TROPHODYNAMIC
CONTROL; SPAWNING STOCK; BORNHOLM BASIN; EGG-PRODUCTION; LIFE STAGES
AB Large-scale climatic conditions prevailing over the central Baltic Sea
resulted in declining salinity and oxygen concentrations in spawning
areas of the eastern Baltic cod stock. These changes in hydrography
reduced the reproductive success and, combined with high fishing
pressure, caused a decline of the stock to the lowest level on record
in the early 1990s. The present Study aims at disentangling the
interactions between reproductive effort and hydrographic forcing
leading to variable recruitment. Based on identified key processes,
stock dynamics is explained Using updated environmental and life
stage-specific abundance and production time-series. Declining
salinities and oxygen concentrations caused high egg mortalities and
indirectly increased egg predation by clupeid fish. Low recruitment,
despite enhanced hydrographic conditions for egg survival in the
mid-1990s, was due to food limitation for larvae, caused by the decline
in the abundance of the copepod Pseudocalanus sp. The case of the
eastern Baltic cod stock exemplifies the multitude effects climatic
variability may have oil a fish stock and underscores the importance of
knowledge of these processes for understanding stock dynamics. (c) 2005
International Council for the Exploration of the Sea. Published by
Elsevier Ltd. All rights reserved.
C1 Danish Inst Fisheries & Marine Res, DK-2920 Charlottenlund, Denmark.
Univ Kiel, Leibniz Inst Marine Sci, D-24105 Kiel, Germany.
Greenland Inst Nat Resources, DK-3900 Nuuk, Greenland.
Latvian Fisheries Res Agcy, LV-1007 Riga, Latvia.
Univ Hamburg, Inst Hydrobiol & Fisheries Sci, D-22767 Hamburg, Germany.
Sea Fisheries Res Inst, Gdynia, Poland.
RP Koster, FW, Danish Inst Fisheries & Marine Res, DK-2920 Charlottenlund,
Denmark.
EM fwk@difres.dk
NR 60
TC 0
PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 1054-3139
J9 ICES J MAR SCI
JI ICES J. Mar. Sci.
PD OCT
PY 2005
VL 62
IS 7
BP 1408
EP 1425
PG 18
SC Fisheries; Marine & Freshwater Biology; Oceanography
GA 989FW
UT ISI:000233659300021
ER
PT J
AU Hinrichsen, HH
Kraus, G
Voss, R
Stepputtis, D
Baumann, H
TI The general distribution pattern and mixing probability of Baltic sprat
juvenile populations
SO JOURNAL OF MARINE SYSTEMS
LA English
DT Article
DE hydrodynamic modeling; advective mixing; hydroacoustics; sprat nursery
grounds; spatial overlap analysis
ID EARLY-LIFE STAGES; NORTH-SEA; COD; CIRCULATION; HADDOCK; LARVAE; MODEL
AB Transport of Baltic sprat Sprattus sprattus L. larvae spawned on
different spawning grounds was investigated by detailed drift model
simulations for the years 1979-2002. Modeling approaches with and
without diurnal vertical migration were applied. We used recently
collected data on spawning location, vertical distribution and the
timing of spawning as input to a particle tracking model. Results of
this modeling study enabled the identification of potential nursery
grounds for sprat originating from different spawning grounds. On
average, westerly winds are prevailing over the Baltic Sea. This leads
to on average higher abundance of juvenile sprat along the southern and
the eastern coast lines of the Baltic. The horizontal distribution of
simulated larval or 0-group sprat is consistent with the observed
distribution of 0-group sprat obtained from the hydroacoustic field
surveys.
In addition, this analysis identifies the potential for advective
mixing between juveniles originating from different spawning sites or
from the same spawning site throughout the spawning season. High
spatial overlap was found between Arkona-and Bornholm Basin larvae
hatched at the beginning of the spawning season. Mixing probability of
sprat juveniles between Arkona-and Gotland Basin as well as between
Bornholm- and Gotland Basin were on relatively low levels. (c) 2005
Elsevier B.V. All rights reserved.
C1 Leibniz Inst Marine Sci, D-24105 Kiel, Germany.
Inst Hydrobiol & Fisheries Sci, Hamburg, Germany.
RP Hinrichsen, HH, Leibniz Inst Marine Sci, Dusternbrooker Weg 20, D-24105
Kiel, Germany.
EM hhinrichsen@ifm-geomar.de
NR 31
TC 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0924-7963
J9 J MARINE SYST
JI J. Mar. Syst.
PD OCT
PY 2005
VL 58
IS 1-2
SI Sp. Iss. 1
BP 52
EP 66
PG 15
SC Geosciences, Multidisciplinary; Marine & Freshwater Biology;
Oceanography
GA 984QU
UT ISI:000233320200004
ER
PT J
AU Hinrichsen, HH
Schmidt, JO
Petereit, C
Mollmann, C
TI Survival probability of Baltic larval cod in relation to spatial
overlap patterns with their prey obtained from drift model studies
SO ICES JOURNAL OF MARINE SCIENCE
LA English
DT Article
DE Baltic cod; Baltic Sea; drift model; spatial overlap
ID EARLY-LIFE STAGES; BORNHOLM BASIN; VERTICAL-DISTRIBUTION; WIND-DRIVEN;
SEA; VARIABILITY; RECRUITMENT; CIRCULATION; DYNAMICS; FISH
AB Temporal mismatch between the occurrence of larvae and their prey
potentially affects the spatial overlap and thus the contact rates
between predator and prey. This might have important consequences for
growth and survival. We performed a case study investigating the
influence of circulation patterns on the overlap of Baltic cod larvae
with their prey. A three-dimensional hydrodynamic model was used to
analyse spatio-temporally resolved drift patterns of larval Baltic cod.
A coefficient of overlap between modelled larval and idealized prey
distributions indicated the probability of predator-prey overlap,
dependent on the hatching time of cod larvae. By performing model runs
for the years 1979-1998 investigated the intra- and interannual
variability of potential spatial overlap between predator and prey.
Assuming uniform prey distributions, we generally found the overlap to
have decreased since the mid-1980s, but with the highest variability
during the 1990s. Seasonally, predator-prey overlap on the Baltic cod
spawning grounds was highest in summer and lowest at the end of the cod
spawning season. Horizontally variable prey distributions generally
resulted in decreased overlap coefficients. Finally, we related
variations in overlap patterns to the variability of Baltic cod
recruitment success. (c) 2005 International Council for the Exploration
of the Sea. Published by Elsevier Ltd. All rights reserved.
C1 Leibniz Inst Marine Sci, D-24105 Kiel, Germany.
Danish Inst Fisheries & Marine Res, DK-2920 Charlottenlund, Denmark.
RP Hinrichsen, HH, Leibniz Inst Marine Sci, Dusternbrooker Weg 20, D-24105
Kiel, Germany.
EM hhinrichsen@ifm.uni-kiel.de
NR 32
TC 0
PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 1054-3139
J9 ICES J MAR SCI
JI ICES J. Mar. Sci.
PD AUG
PY 2005
VL 62
IS 5
BP 878
EP 885
PG 8
SC Fisheries; Marine & Freshwater Biology; Oceanography
GA 952JD
UT ISI:000230998900005
ER
EF
