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Variations in the distributions of Centropages chierchiae and Temora stylifera (Copepoda: Calanoida) in the north-eastern Atlantic Ocean and western European shelf waters. Reporter : Li Chi-Tien. 東北大西洋和西歐沿海 Centropages chierchiae 與 Temora stylifera 分布之變動.

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Reporter li chi tien

Variations in the distributions of Centropages chierchiae and Temora stylifera (Copepoda: Calanoida) in the north-eastern Atlantic Ocean and western European shelf waters

Reporter:Li Chi-Tien

東北大西洋和西歐沿海 Centropages chierchiae與 Temora stylifera分布之變動

J. A. Lindley and S. Daykin

ICES Journal of Marine Science, 62: 869e877 (2005)


Introduction

Celtic Sea

English Channel

Bay of Biscay

Iberian coastal waters

(NAO)


Introduction

C. chierchiae

It restricted to the eastern Atlantic, Mediterranean, and western Indian Ocean

Celtic Sea

English Channel

T. stylifera

Bay of Biscay

It is known from all the oceans as well as the Mediterranean Sea and Red Sea

Iberian coastal waters

Found in the tropical and subtropical waters

The objective of this study was to provide detailed information on the occurrence of these species in the CPR survey and to analyse the changes in relation to some environmental variables.


Methods

Plankton sampling

CPR survey

Celtic Sea

English Channel

Bay of Biscay

Iberian coastal waters

C. chierchiae

T. stylifera


Methods

Environmental data

Statistical analyses

  • Sea surface temperature (SST)

    • in situ sea surface observations and satellite derived estimates

  • The shelf edge current (SEC)

  • described further in Holliday and Reid (2001) and Reid et al. (2001)

  • The North Atlantic Oscillation (NAO)

  • The Gulf Stream North Wall Index (GSNWI)

  • North hemisphere temperature (NHT)

  • Lamb weather types

Pearson’s correlation.

(NHT)

(NAO)

(GSNWI)


Results

Distributions

Celtic Sea

English Channel

Bay of Biscay

Iberian coastal waters


Results

Seasonal cycles


Results

Year-to-year changes


Results

1959

1989


Results

NHT:The lower values in the mid-1960s, and steady rise since 1977

NAO:The high value in 1989

GSI:Low values in the 1970s, and increase until 1995

SEC:A peak in 1989, and a decline to 2000, with exceptionally in 1998 and 1999

NW:The number of days of northwesterly weather over Britain, higher in 1979



Discussion

(NHT)


Discussion

ballast water

1959

1989


Discussion

The seasonal cycles of C. chierchiae in Bay of Biscay and Iberian coastal waters are similar to the frequent occurrence through late spring and summer.

The seasonal cycle of T. stylifera with its seasonal peak late in the year is consistent with the results from the southern coastal area of the Bay of Biscay


Conclusion
Conclusion

The results of the analyses of differences between the species in the correlations with the NHT, SEC and NAO, indicate that ecological differences between species will result in different responses to climate change.

Our results, therefore, support Villate et al. (1997) in suggesting that Temora stylifera can be a key species in monitoring climate changes in the Bay of Biscay (and now more northerly areas) but adding Centropages chierchiae would help to avoid dependence on the ecological characteristics of a single species.



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