1 quantitative variability of the copepod assemblages in the northern adriatic sea from 1993 to 1997...

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Quantitative variability of the copepod assemblages in the northern Adriatic Sea fr

om 1993 to 1997在 1993~1997 年間北亞德里亞海橈足類群聚數量的變動

Frano Kršinićª,* ， Dubravka Bojanić b ，Robert Precali c ， Robert Kraus c

Estuarine, Coastal and Shelf Science(2007),74:528-538

Reporter: Meng-Yau Li

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Introduction The western part of this

area is higher productivity than eastern.

Comparison of these result ,total copepod population and phytoplankton blooms in past and present.

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Micro-phytoplankton (cells >20μm)

Calanoida 哲水蚤 Oithonids長腹劍水蚤

Oncaeid大眼劍水蚤

Nauplii 橈足類幼生

Ciliate 纖毛蟲

Nano-phytoplankton (cells 2-20μm)

Tintinnid水母類

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Objective Two characteristic stations in the northern Adriat

ic Sea between 1993 and 1997. It determine the quantitative aspect of the popul

ation structure ， seasonal abundance and vertical variability of all copepod assemblages .

Significantly influence changes in the ecosystem of this sensitive region.

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Materials and methods

Vessel : Vila Velebita ,43 Cruises Station: SJ107Eastern and SJ108Western Period : January 1993 to October 1997 Depth : 0.5m 、 10m 、 20m and near botto

m

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Fig.1. Map of the northern Adriatic Sea with location of sampling stations.

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Choice station region

CTD

bongo net

sample

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CTD

bongo net

sample Conductivity Temperature Depth Recorder

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CTD

bongo net

sample

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CTD

bongo net

sampling

2.5 formaldehyde﹪ 2 lugol’s solution﹪

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Multivariate analysis (perform)

multi-dimensional Scaling (MDS)

Bray-Curtis similarity (classification)

Similarity percentage Analysis (SIMPER)

Log(n+1)

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Result

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Result

2.Phytoplankton1.Hydrography3.Ciliated pr

otozoans

Abundance and

variable

4.Copepod assemblages

Oithonid and

OncaeidcalanoidaNuplii

Predominance and Significant species

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Result


otozoans

Abundance and

variable


Oithonid and



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1. Hydrography

1. tMin(7.40 ) ,tMax(29.83 )℃ ℃ ； sMin(21),sMax(38.77)2. tMax(29.83 ) and sMin(21) in SJ108℃

3.But , sMax(38.77) in SJ107 Southern current

1.Pronunced saltier and warmer water intrusion area.2.Lack of circulation.

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Result


otozoans

Abundance and

variable


Oithonid and



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2.Phytoplankton----compare SJ107E and SJ108W abundance

a. 40-70％ b. 10-30％

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Result


otozoans

Abundance and

variable


Oithonid and



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3.Ciliated protozoans

2. Max SJ108W1. Max SJ107E Min SJ107E

3. Max SJ108Tintinnopsis minuta =97%

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Result


otozoans

Abundance and

variable


Oithonid and



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4.Copepod assemblages-Nauplii

2. MaxD,20m1.MaxD,10m 3.SJ107E 10m and SJ108W MinD at the same time

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Nauplii total number of copepods

Year StationPercentage

(%)

1995 SJ107 67

1996 SJ107 55-67

1997 SJ107 84

1993 SJ108 74

1994~1995

SJ108 63

1997 SJ108 80

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Result


otozoans

Abundance and

variable


Oithonid and



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4.Copepod assemblages-Calanoida

3.SJ108W33-50% >SJ107E2.June to August 1.Surface 10m , Population Variation

SJ107E

SJ108W

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Predominance species August- Paracalanus parvus ( 小擬哲水蚤 )

November- Acartia clausi

( 刺尾紡錘水蚤 )

Average18~38%

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Significant species Ctenocalanus vanus

Temora longicornis( 寬水蚤 )

Centropages typicus( 刺水蚤 )

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Result


otozoans

Abundance and

variable


Oithonid and



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4.Copepod assemblages-Oithnid

1.SJ108W>SJ107E 3.1993 and 1994,50-64％2.MaxD,10m-20m

4.Oithona nana and oithona similis,20-47%

SJ107E

SJ108W

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4.Copepod assemblages-Oncaeids

1.Max value Autumn/Winter, except summer of 1997

24-40%

18-53%

SJ107E

SJ108W

2. 20m,1994Dec. SJ108W-Oncaea waldemari 1997Sep. SJ108W-Monothula subtilis bottom,Oncaea media and Oncaea zernovi

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Statistical analysis

SJ107 E

SJ107 E

1.In 1994 and 1995,Non-loricates(無甲殼類 ) from group C was high value.

2.Oncaeid(大眼劍水蚤 ) from group A2 at 1993.1994.1995

3.Nuplii(橈足類幼生 ) and Tintinnid(水母類 ) belong group B

4.Group D was Tintinnids in 1997.

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SJ108 W

1. Oncaeid (大眼劍水蚤 ) from group A2 at 1994 and 1995.

2. In 1994 and 1995,Nuaplii (橈足類幼生 )from group C was high value.

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Use SIMPER Analysis

Species group

variable

Percentage

(％ )

Nauplii 33

Oncaeids 24.3

Oithonids 22.9

Calanoids 19.8

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Fig.7. Average Max value SJ108 ； 5.8×106

Average Max value SJ107 ； 5.2×106

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1.Mainly depth 10-20m. 2.Seasonal influence category abundance

and Correlation coefficient is positive. 3.Interspecific Correlation.

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Conclusion The structure and variability of major group of

copepod population in northern Adriatic. Complex processes and regulation of

phytoplankton production levels during the warmer months.

Combine all methods in determine patterns in vertical distributeions,and during the stratification period.

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The End~

Thank you !!

1 quantitative variability of the copepod assemblages in the northern adriatic sea from 1993 to 1997...

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