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Titolo:
Transport and retention of flounder larvae (Platichthys flesus L.) in the Dollard nursery (Ems estuary)
Autore:
Jager, Z;
Indirizzi:
Natl Inst Coastal & Marine Management, RIKZ, NL-9750 AE Haren, NetherlandsNatl Inst Coastal & Marine Management Haren Netherlands NL-9750 AE lands
Titolo Testata:
JOURNAL OF SEA RESEARCH
fascicolo: 2, volume: 45, anno: 2001,
pagine: 153 - 171
SICI:
1385-1101(200105)45:2<153:TAROFL>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLAICE PLEURONECTES-PLATESSA; WESTERN WADDEN SEA; NORTH-SEA; POPULATION-DYNAMICS; JUVENILE FLATFISH; TIDAL TRANSPORT; RECRUITMENT; IMPACT; PREDATION; CAROLINA;
Keywords:
Platichthys flesus; flounder; nursery; transport; retention; wind;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Jager, Z Natl Inst Coastal & Marine Management, RIKZ, POB 207, NL-9750 AE Haren, Netherlands Natl Inst Coastal & Marine Management POB 207 Haren Netherlands NL-9750 AE
Citazione:
Z. Jager, "Transport and retention of flounder larvae (Platichthys flesus L.) in the Dollard nursery (Ems estuary)", J SEA RES, 45(2), 2001, pp. 153-171

Abstract

Variability in tidal transport of larval flounder (Platicthys flesus L.) in the Dollard was investigated to estimate the quantity of larvae that are annually retained in the nursery based on simultaneous measurements of water transport and larval concentrations. Sampling was done three times per hour in the main channel in the Dollard, during 35 tidal cycles divided over 1993, 1993 and 1995. In 1993, additional sampling was carried out simultaneously during eight tidal cycles in a subsidiary channel. Larval concentrations showed marked tidal variations at all time scales and indicated a patchy spatial distribution. The estimated net tidal transport of larvae was notcorrelated to the net tidal transport of water. However, a higher net water transport coincided with higher retention, defined as the percentage of net larval transport divided by the flood larval transport. Also, relativelylonger duration of the flood than the ebb period (tidal asymmetry) was positively correlated with both net tidal water transport and larval retention. The wind direction significantly affected the net water transport at the cross-section in the main channel, whereas wind speed was not significant. The flood transport, but not the ebb or net transport, was significantly higher during spring tide following full moon than during the other lunar phases. The net tidal transport of larvae was much more variable in 1993 than in 1993 and 1995, frequently resulting in ebb surpluses in larval transport. Despite higher mean concentrations, the estimated net larval input was lower in 1994 than in 1993. This corresponded neither with the observed abundanceestimates of juvenile flounder in the Dollard in these two years, nor withthe abundance index obtained from routine surveys. The total larval input better reflects the juvenile Bounder abundance. Variability in water circulation, influenced by varying wind conditions, and its effect on larval transport and retention is an important source of variability in larval immigration in the nursery and is held responsible for a poor correlation between net larval input and juvenile abundance. (C) 2001 Elsevier Science B.V. Allrights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 09:31:00