Rapport de Campagne - Station Biologique de Roscoff
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Rapport de Campagne - Station Biologique de Roscoff

Rapport de Campagne - Station Biologique de Roscoff Rapport de Campagne - Station Biologique de Roscoff

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COMPTE RENDU DE CAMPAGNE A LA MER SUR UN NAVIRE Ifremer Date : 16/05/1999 Observateur : POND David Pilotes : DUBOIS, LUBIN HOPE99 Plongée : 1385 Station : 13 N lat moy : N 12 45 long moy : W 103 59 Réferences de positionnement : Xo : 610000 Yo : 1410000 fuseau : 13 Sites explorés : ∑ Genesis Objectifs de la plongée : Find Plasma and release it Find the shuttle and bring it on site Settle the large trap at the base of the Riftia column Recover the whelk trap Deploy SMAC beyond the small chimneys (TRAC site) 1 multi-sampler on the Alvinella (under the TRAC or on the chimney to the left of it) 1 multi-sampler among the Riftia at the botttom of the trench Alvinella sampling in the box at the top of thr Riftia column Slurp the small orange amphipods swarm in bottle 1 Sample the coloured Riftia from the top of the trench. Slurp gun to clean up Résumé des travaux : Ont été effectués durant la plongee : * 7 prélèvements biologiques, * 8 prélèvements de fluides, 14 images ont été numérisées, 2 mouillages ont été posés. 2 mouillages ont été relevés. Rapport de plongée : Heure Localité X Y Prof (m) N° Photo Commentaires 16:35:00 13 N 4977 6655 2626 Nautile arrives on the bottom 16:35:00 13 N 5017 6528 2632 Numerous small white Galitheids 16:36:00 13 N 5012 6568 2631 White octopus (total length approx 25cm) 16:37:57 13 N 4980 6495 2625 Basalt pillar larva. Very little detrital material 16:41:01 13 N 5001 6497 2630 Small white eel like fish (10 cm) 16:46:08 Genesis 4996 6518 2630 Arrive at Genesis. Riftia on main chimney are very impressive 16:46:26 Genesis 4995 6519 2631 Large detrital particles in the water column. Also small zooplankton 16:46:32 Genesis 4990 6527 2631 Plasma in view 16:47:43 Genesis 4914 6418 2627 Particles in the water column moving left to right across video screen, coupled with the angle of the line attached to Plasma suggests the presence of a tidal stream 16:47:57 Genesis 4852 6263 2626 Swarm of small orange amphipods above the chimney and on the periphery of the shimmering water HOPE 99 Page 159 1385 / 57 / 29

COMPTE RENDU DE CAMPAGNE A LA MER SUR UN NAVIRE Ifremer 16:49:12 Genesis 4971 6490 2620 001 Photograph of the main genesis site with Plasma located 2 m away on what is possibly the up-cuttent side. The highest density of Riftia plumes is on the down-current side of the photograph to the right of the picture. 16:51:04 Genesis 4964 6535 2625 002 A photograph of Plasma from above showing that depite being located very close to the chimney, it was placed on detrital free basalt with numerous Galitheids 16:51:59 Genesis 4964 6792 2626 Nautile disturbes light brown detrital material 16:55:36 Genesis 4959 6498 2628 003 Substantial numbers of limpets encrusting the tubes of the large Riftia at the top of the chimney 17:06:57 Genesis 4955 6507 2627 Plasma released 17:17:00 Genesis 4906 6667 2629 L ascenseur located and transported to the genesis site 17:59:00 Genesis 4978 6544 2628 Arrival at the Genesis site with l ascenseur 18:06:00 Genesis 4988 6526 2628 L ascenseur deployed 18:17:00 Genesis 4963 6530 2632 Deployment of le grende nasse at the base of the genesis chimney 18:23:00 Genesis 4963 6530 2632 Recovery of whelk trap 18:25:00 Genesis 4964 6529 2630 004 Site of SMAC deployed beyond the small chimneys25 18:30:00 Genesis 6841 7203 2631 005 SMAC (E) deployed 18:32:00 Genesis 6321 5324 2634 Description by Max Dubois of the condition of the TRAC 18:42:00 Genesis 4985 6523 2629 Return to l ascenseur 18:52:04 Genesis 6924 7060 2634 Début de manip multi-préleveur, 20 cm from the TRAC at the small chimneys 18:54:04 Genesis 6900 7286 2634 10 cm from the TRAC 18:56:38 Genesis 6924 7125 2634 006 2cm from the TRAC 18:58:15 Genesis 6893 7323 2634 Underneath the TRAC 19:12:00 Genesis 4983 6762 2632 007 Coloured Riftia at the base of the trench 19:14:00 Genesis 4966 6675 2630 Just outside the Riftia 19:18:00 Genesis 6381 6303 2630 3cm inside the Riftia 19:20:00 Genesis 5923 5661 2631 The probe for this sample was pushed into the Riftia but may have protruded out of the colony 19:23:00 Genesis 4998 6673 2631 Fin de manip multi-préleveur,15 cm into the Riftia 20:01:00 Genesis 4995 6544 2627 L ascenseur returned to the surface 20:08:00 Genesis 4972 6506 2629 008 Alvinella sampling from the top of the Riftia column 20:26:00 Genesis 4983 6527 2631 009 Collection of the small orange amphipods using the Slurp gun (1). Sample taken from above the chimney plume. 20:32:00 Genesis 4989 6619 2631 010 Numerous limpets on Riftia tubes at the top of the genesis chimney 20:38:00 Genesis 6498 7539 2632 012 Blue coloured Riftia 20:39:04 Genesis 4979 6777 2631 013 Numerous dead/dying Riftia at the bottom of the chimney 20:39:50 Genesis 4978 6808 2631 014 Tremendous Serpulid growth on the basalt on the periphery of the Riftia colony 20:50:07 Genesis 5014 6822 2631 015 Sampling of the blue Riftia at the top of the trench 21:15:00 Genesis 4985 6546 2632 Blue Riftia site sampled for small animals with a slurp gun 21:21:00 Genesis 4998 6816 2623 Collection of orange shrimp (Alvinocaris) using the slurp gun 21:31:00 Genesis 4992 6560 2623 Return to the surface HOPE 99 Page 160 1385 / 57 / 29

COMPTE RENDU DE CAMPAGNE A LA MER SUR UN NAVIRE Ifremer<br />

Date : 16/05/1999<br />

Observateur : POND David<br />

Pilotes : DUBOIS, LUBIN<br />

HOPE99<br />

Plongée : 1385<br />

<strong>Station</strong> : 13 N lat moy : N 12 45 long moy : W 103 59<br />

Réferences <strong>de</strong> positionnement :<br />

Xo : 610000 Yo : 1410000 fuseau : 13<br />

Sites explorés :<br />

∑ Genesis<br />

Objectifs <strong>de</strong> la plongée :<br />

Find Plasma and release it<br />

Find the shuttle and bring it on site<br />

Settle the large trap at the base of the Riftia column<br />

Recover the whelk trap<br />

Deploy SMAC beyond the small chimneys (TRAC site)<br />

1 multi-sampler on the Alvinella (un<strong>de</strong>r the TRAC or on the chimney to the left of it)<br />

1 multi-sampler among the Riftia at the botttom of the trench<br />

Alvinella sampling in the box at the top of thr Riftia column<br />

Slurp the small orange amphipods swarm in bottle 1<br />

Sample the coloured Riftia from the top of the trench. Slurp gun to clean up<br />

Résumé <strong>de</strong>s travaux : Ont été effectués durant la plongee :<br />

* 7 prélèvements biologiques,<br />

* 8 prélèvements <strong>de</strong> flui<strong>de</strong>s,<br />

14 images ont été numérisées,<br />

2 mouillages ont été posés.<br />

2 mouillages ont été relevés.<br />

<strong>Rapport</strong> <strong>de</strong> plongée :<br />

Heure Localité X Y Prof (m) N° Photo Commentaires<br />

16:35:00 13 N 4977 6655 2626 Nautile arrives on the bottom<br />

16:35:00 13 N 5017 6528 2632 Numerous small white Galitheids<br />

16:36:00 13 N 5012 6568 2631 White octopus (total length approx 25cm)<br />

16:37:57 13 N 4980 6495 2625 Basalt pillar larva. Very little <strong>de</strong>trital material<br />

16:41:01 13 N 5001 6497 2630 Small white eel like fish (10 cm)<br />

16:46:08 Genesis 4996 6518 2630 Arrive at Genesis. Riftia on main chimney are very impressive<br />

16:46:26 Genesis 4995 6519 2631 Large <strong>de</strong>trital particles in the water column. Also small<br />

zooplankton<br />

16:46:32 Genesis 4990 6527 2631 Plasma in view<br />

16:47:43 Genesis 4914 6418 2627 Particles in the water column moving left to right across vi<strong>de</strong>o<br />

screen, coupled with the angle of the line attached to Plasma<br />

suggests the presence of a tidal stream<br />

16:47:57 Genesis 4852 6263 2626 Swarm of small orange amphipods above the chimney and on the<br />

periphery of the shimmering water<br />

HOPE 99 Page 159 1385 / 57 / 29

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