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

J. A. Lindley and S. DaykinICES Journal of Marine Science, 62: 869e877 (2005)

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

Introduction

Celtic Sea

English Channel

Bay of Biscay

Iberian coastal waters

(NAO)

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.

C. chierchiae

T. stylifera

Found in the tropical and subtropical waters

Celtic Sea

English Channel

Bay of Biscay

Iberian coastal waters

Introduction

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

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

MethodsPlankton sampling

CPR survey

Celtic Sea

English Channel

Bay of Biscay

Iberian coastal waters

C. chierchiae T. stylifera

Environmental data• 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

(NAO) (GSNWI) (NHT)

Methods

Pearson’s correlation.

Statistical analyses

ResultsDistributions

Celtic SeaEnglish Channel

Bay of Biscay

Iberian coastal waters

Seasonal cyclesResults

Year-to-year changesResults

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

Results

Results

(NHT)

Discussion

Discussion

1959 1989 ballast water

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

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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