[10:26:24] iscwatch leaves the room [11:24:24] DIVE04 test message from Okeanos Explorer [11:49:30] EX2104_DIVE04 ROV powered off [12:15:02] EX2104_DIVE04 ROV Launch [12:20:00] jasonchaytor leaves the room [12:22:33] EX2104_DIVE04 ROV on Surface [12:23:11] EX2104_DIVE04 ROV Descending [12:24:58] LAT : 34.390763 , LON : -51.768409 , DEPTH : 33.1263 m, TEMP : 21.57294 C, SAL : 36.689 PSU, DO : 7.84683 mg/l [12:29:58] LAT : 34.390844 , LON : -51.769701 , DEPTH : 114.4604 m, TEMP : 18.98446 C, SAL : 36.64102 PSU, DO : 6.87101 mg/l [12:32:10] jocelyncooper leaves the room [12:33:18] jasonchaytor leaves the room [12:33:51] jasonchaytor leaves the room [12:34:59] LAT : 34.390882 , LON : -51.771026 , DEPTH : 260.8704 m, TEMP : 18.35103 C, SAL : 36.55699 PSU, DO : 6.63197 mg/l [12:39:59] LAT : 34.391029 , LON : -51.772322 , DEPTH : 404.7188 m, TEMP : 16.91956 C, SAL : 36.30911 PSU, DO : 6.00457 mg/l [12:44:03] jocelyncooper leaves the room [12:44:59] LAT : 34.391158 , LON : -51.773594 , DEPTH : 548.4115 m, TEMP : 14.71209 C, SAL : 35.94667 PSU, DO : 5.55768 mg/l [12:50:00] LAT : 34.391396 , LON : -51.774687 , DEPTH : 695.5141 m, TEMP : 11.52235 C, SAL : 35.48569 PSU, DO : 5.252 mg/l [12:55:00] LAT : 34.391581 , LON : -51.775656 , DEPTH : 848.1223 m, TEMP : 8.83275 C, SAL : 35.24043 PSU, DO : 5.29885 mg/l [13:00:01] LAT : 34.391481 , LON : -51.775847 , DEPTH : 992.8847 m, TEMP : 6.78396 C, SAL : 35.1334 PSU, DO : 6.32069 mg/l [13:04:35] iscwatch leaves the room [13:04:55] jasonchaytor leaves the room [13:05:01] what time to the bottom? [13:05:03] LAT : 34.391328 , LON : -51.775699 , DEPTH : 1148.9537 m, TEMP : 5.74284 C, SAL : 35.10689 PSU, DO : 7.25039 mg/l [13:05:31] morning Rhian, Jason [13:06:08] Good morning - we should be on bottom around 45 minutes [13:10:02] LAT : 34.39113 , LON : -51.775478 , DEPTH : 1299.4798 m, TEMP : 5.37165 C, SAL : 35.12307 PSU, DO : 7.7014 mg/l [13:15:02] LAT : 34.39098 , LON : -51.775332 , DEPTH : 1448.375 m, TEMP : 4.98683 C, SAL : 35.09523 PSU, DO : 7.94661 mg/l [13:19:50] kimberlygalvez leaves the room [13:20:03] LAT : 34.390852 , LON : -51.775278 , DEPTH : 1600.9774 m, TEMP : 4.37354 C, SAL : 35.01644 PSU, DO : 8.22127 mg/l [13:24:08] bramleymurton leaves the room [13:25:03] LAT : 34.390833 , LON : -51.775217 , DEPTH : 1753.0652 m, TEMP : 4.15125 C, SAL : 35.00764 PSU, DO : 8.24889 mg/l [13:27:12] jasonchaytor leaves the room [13:30:03] LAT : 34.39112 , LON : -51.775183 , DEPTH : 1908.4699 m, TEMP : 3.95971 C, SAL : 34.9959 PSU, DO : 8.22902 mg/l [13:31:30] jocelyncooper leaves the room [13:35:04] LAT : 34.391069 , LON : -51.775076 , DEPTH : 2058.2063 m, TEMP : 3.82385 C, SAL : 34.98989 PSU, DO : 8.19288 mg/l [13:40:04] LAT : 34.391089 , LON : -51.775064 , DEPTH : 2212.6942 m, TEMP : 3.62712 C, SAL : 34.97706 PSU, DO : 8.21933 mg/l [13:45:02] good morning tina [13:45:06] LAT : 34.391171 , LON : -51.774917 , DEPTH : 2364.6177 m, TEMP : 3.43045 C, SAL : 34.96637 PSU, DO : 8.21368 mg/l [13:47:15] 55m off bottom [13:50:06] LAT : 34.391347 , LON : -51.775123 , DEPTH : 2402.9042 m, TEMP : 3.3744 C, SAL : 34.96332 PSU, DO : 8.23245 mg/l [13:51:18] bottom in sight [13:51:21] on bottom [13:52:24] EX2104_DIVE04 ROV on Bottom [13:53:49] cristianacastellobranco leaves the room [13:55:06] LAT : 34.391652 , LON : -51.775148 , DEPTH : 2413.0086 m, TEMP : 3.35718 C, SAL : 34.96221 PSU, DO : 8.21215 mg/l [13:55:31] Good morning! [13:55:41] Morning all! [13:57:15] Good morning everyone! [13:57:21] Good morning [13:59:44] Could be the radar dish type sponges we were seeing yesterday, just a different morph [14:00:07] LAT : 34.391634 , LON : -51.775058 , DEPTH : 2412.281 m, TEMP : 3.3559 C, SAL : 34.9632 PSU, DO : 8.226 mg/l [14:00:12] good morning jocelyn and thomas [14:01:09] haroldcarlson leaves the room [14:01:35] I think in family Euretidae [14:02:16] we're also seeing coral rubble around the area [14:03:34] bramleymurton leaves the room [14:04:03] upasanaganguly leaves the room [14:04:29] Possibly a serpulid polychaete tube on the dead tissue... [14:05:08] LAT : 34.391564 , LON : -51.774803 , DEPTH : 2410.9366 m, TEMP : 3.34691 C, SAL : 34.96299 PSU, DO : 8.21719 mg/l [14:05:13] Aphrocalistes? [14:06:46] I was only going to offer Euplectellidae! But that could be wrong. [14:06:56] I have to re-learn these sponges on each expedition [14:10:08] LAT : 34.391516 , LON : -51.774959 , DEPTH : 2412.7053 m, TEMP : 3.34452 C, SAL : 34.96223 PSU, DO : 8.18327 mg/l [14:11:06] Cerianthid to its right? [14:11:30] Desmophyllum was here.... [14:12:56] amphipod [14:13:02] floater [14:13:08] photobombed by an amphipod [14:13:40] I'm guessing a stegocephalid, a group that likes to swim [14:14:12] That one seemed to prefer to float with slight kicks! [14:14:28] kimberlygalvez leaves the room [14:15:08] LAT : 34.391593 , LON : -51.774987 , DEPTH : 2412.8438 m, TEMP : 3.33219 C, SAL : 34.95924 PSU, DO : 8.20371 mg/l [14:15:24] Chrysogorgia abludo? [14:16:04] Mysid on branch [14:16:22] No, sorry, last view shows its C. tricaulus [14:17:08] Could just see down the axis and spotted the widely separated branches [14:17:30] Interesting how our memories focus on different things: on the Corner Seamounts I remember long stretches of coarse sediments with occasional Acanella colonies popping up! [14:17:36] THanks Les! [14:17:42] @Les: classic tricaulis [14:17:49] Hah - my focus on scleractinians is showing! [14:18:14] No, this is a contracted zoanthid [14:18:21] But your description is good! [14:18:24] haha [14:19:10] dhugallindsay leaves the room [14:19:28] the D. are all dead so maybe colonized during last glacial as suggested in Laura Robinson paper [14:20:08] LAT : 34.3915 , LON : -51.774918 , DEPTH : 2408.9478 m, TEMP : 3.34802 C, SAL : 34.9617 PSU, DO : 8.21467 mg/l [14:21:26] Isidid or primnoid...? If later, the biggest we've seen. [14:21:32] *latter [14:22:33] I think after the ctenophore we really want a look at thta large coral fan. I think it will be new for expedition [14:23:26] Everything here is interesting because we didn't dive this deep in 2005 [14:23:37] jaymesawbrey leaves the room [14:23:49] @Les: maybe that is why this looks so different to me! [14:24:03] Asteronyx loveni or relative [14:25:06] @Scott, yep! [14:25:10] LAT : 34.391558 , LON : -51.774849 , DEPTH : 2402.3415 m, TEMP : 3.35035 C, SAL : 34.96233 PSU, DO : 8.19899 mg/l [14:25:21] bramleymurton leaves the room [14:26:56] The stalked sponge could be Rhabdopectella sp [14:28:48] michaelvecchione leaves the room [14:28:50] jaymesawbrey leaves the room: Replaced by new connection [14:30:09] LAT : 34.391535 , LON : -51.774733 , DEPTH : 2396.3368 m, TEMP : 3.3619 C, SAL : 34.96433 PSU, DO : 8.21642 mg/l [14:30:19] @Chris: I missed the specific sponge you were referencing. So many! [14:31:03] jaymesawbrey leaves the room [14:31:03] That ophiuroid seen earlier was probably Astrochele, not Asteronyx [14:33:08] Yeah Scott, we passed over it pretty quickly but it has a distinctive look that I could recognize even without a closeup [14:33:31] chrysogorgiid on the left [14:35:09] LAT : 34.39155 , LON : -51.774633 , DEPTH : 2396.2454 m, TEMP : 3.35668 C, SAL : 34.96314 PSU, DO : 8.18917 mg/l [14:36:15] Closeup on the branching stuff? [14:36:34] Do we know why the squat lobsters only appear to be associating with the chrysogorgia corals? [14:36:35] nice bryozoan [14:36:57] yeah, that is what I was wondering Les [14:37:48] The branching seemed to have more hydroid like polyps on the big screen, but they're so hard to tell and they were at full zoom. [14:38:17] Fuzzy sponge in the back is either a rossellid or a demosponge. Plate like sponges are probably all euretids. Don't know about the holey one [14:38:28] @Jocelyn: It might have something to do with the open branching structure - like they are living in an open cage. But note there are other chirostylid species that live on other types of corals, e.g. on black corals [14:39:27] e.g. squat lobsters in general are not restricted t o Chrysogorgia, but there are specific species that are restricted to Chrysogorgia (or so it seems) [14:39:45] @Jason, looks more like sheet flows here, a transition from the pillows we saw earlier? [14:40:09] LAT : 34.391591 , LON : -51.77458 , DEPTH : 2390.5459 m, TEMP : 3.36157 C, SAL : 34.96312 PSU, DO : 8.20219 mg/l [14:40:13] @scott that is really interesting! [14:40:56] haroldcarlson leaves the room [14:41:07] @scott, these sticks are bamboo? [14:41:34] @Tina: sorry - wasn't paying attention [14:41:37] Farreids, possibly Amphidiscella, and euretids. Its a spongitopia! [14:42:03] Rosellid vase is the yellower one [14:42:12] @there are small sticks in-between and on sponges.. [14:42:33] leswatling leaves the room [14:42:40] Looks like a Corallium [14:42:46] @Jason there are some bllocky piesces in the mid-far range CAm1 [14:42:52] With anotrher Astrochele [14:42:55] at least corallidae [14:43:09] Thought I saw what could be a tretodictyid off to the right of the coral [14:44:23] bramleymurton leaves the room [14:44:59] Can you zoom the branching sponge? [14:45:09] LAT : 34.391607 , LON : -51.774619 , DEPTH : 2389.3775 m, TEMP : 3.35924 C, SAL : 34.96332 PSU, DO : 8.19135 mg/l [14:45:26] May have been 2 aplocaphorans on that Corallium [14:45:38] *aplacophorans [14:46:06] I don't recognize the coral fan to far right... [14:46:38] one sponge of many [14:46:48] Yes, I think it is a tretodictyid possibly in the genus Sclerothamnus. Thanks very much [14:48:14] kelseyviator leaves the room [14:48:15] Primnoid [14:48:28] you can see worls [14:48:56] just noting the unidentified fish several minutes ago [14:48:59] I agree Tina. Paracalyptrophora maybe??? [14:49:34] coral predators here, but not the tissue clearance we saw on previous dive? [14:49:49] haroldcarlson leaves the room [14:50:04] @Cindy: not so far. [14:50:09] LAT : 34.3916 , LON : -51.774498 , DEPTH : 2389.068 m, TEMP : 3.37029 C, SAL : 34.96325 PSU, DO : 8.16538 mg/l [14:50:21] @Cindy: maybe they ate so many of those corals it was time to migrate! ;-) [14:51:14] upasanaganguly leaves the room [14:51:29] it was a species described by Pasternak off Rockway seamount. Calyptrophora microdentata [14:51:58] but much shalower ~~ 950 m deep [14:52:15] We saw C. microdentata several times on the NES dives. [14:52:37] Possibility for a rock sample from that crevice? [14:52:37] leswatling leaves the room [14:52:40] @Jason, are there loose blocks in front of tjhe ROV? [14:52:51] Just wondering if something has been trapped there [14:53:00] @Tina: including as deep as 2300 meters [14:53:27] @Jason: and ROVs! [14:53:38] The pilots are on lookout for a collecable rock [14:53:43] Don't say "We want you to squeeze into that crevice" [14:53:53] WE have not seen any thus far [14:53:57] no fish? [14:54:06] Peter says he saw one fish [14:54:11] Peter mentioned one above that we didn't zoom on [14:54:16] I did not see it [14:54:23] Neither did I. [14:54:25] halosaur? [14:55:10] LAT : 34.391611 , LON : -51.774366 , DEPTH : 2389.6268 m, TEMP : 3.36268 C, SAL : 34.96448 PSU, DO : 8.17811 mg/l [14:55:15] cristianacastellobranco leaves the room [14:55:53] bramleymurton leaves the room [14:56:14] peterauster leaves the room [14:57:33] have trouble with videofeed.. [14:58:14] Local high, so they are mving to waypoint 2 [14:58:41] so it is OK we are in mid-water [14:58:52] not much planktonic except for a few gammarid amphipods [14:59:00] They are coming down to bottom [14:59:04] Must have been a pinnacle [14:59:18] midwater="the blue screen of life" [14:59:45] nice one! [15:00:11] LAT : 34.391354 , LON : -51.774232 , DEPTH : 2396.2711 m, TEMP : 3.3303 C, SAL : 34.96189 PSU, DO : 8.21082 mg/l [15:00:19] @Mike: any further thoughts on the possible "real big squid" from earlier dive? [15:00:25] that pinicle may have been an eruptive centre where the local lava flows came from X million years ago! [15:00:29] mysid [15:00:40] kevinkonrad leaves the room [15:00:52] Fish! [15:01:28] Ophidiid cusk eel [15:01:58] bramleymurton leaves the room [15:02:18] keep getting knocked out of chat when I switch to another page! Need to log in each time! [15:02:27] Oh no! [15:02:59] Scott, stalked sponge to lower left is what I think is Rhabdopectella [15:03:20] Now its on lower right [15:03:24] Just off screen now? [15:03:45] @Chris: so, like a skinny vase? [15:03:51] yeah, it has a big body compared to stalk and also has holes [15:03:53] The one that is half dead? [15:04:05] Oh, I see it now! [15:04:10] It's now dead center low [15:04:12] There are 2 of them. [15:04:50] Yes [15:04:57] noellehelder leaves the room [15:05:12] LAT : 34.391399 , LON : -51.774231 , DEPTH : 2400.582 m, TEMP : 3.29317 C, SAL : 34.96013 PSU, DO : 8.17433 mg/l [15:05:30] @scott: I have been thinking about it a lot. It is either Architeuthis dux or Narrowteuthis nesisi (in sister family Neoteuthidae). One question is "how big was it?" Why did you say "real big squid"? [15:06:06] rocks look loose! [15:06:34] kelseyviator leaves the room [15:06:51] @Mike: I was being "flipant" and avoiding saying giant squid. [15:07:07] @Mike: in seriousness, I was not referring to its actual size. [15:07:13] The tablet shaped one there against the outcrop, if that is loose, looks great. [15:07:32] The really giant one @thomas :) [15:07:32] bramleymurton leaves the room [15:07:53] Gotta go for a while. will be back [15:07:57] I can never tell what is appropriate sampling size until the arm is on it. [15:08:07] christopherkelley leaves the room [15:08:14] mysid [15:08:22] I did not see lasers. I would be very happy if someone could give me a size estimate (even educated guess) on the squid. [15:08:27] peterauster leaves the room [15:09:02] @Mike: you should be able to go back to the dive on SeaTube and watch it and get some context from surroundings. [15:09:08] @michael we'd just landed so it was a quick zoom. Maybe a foot or two? [15:09:20] 15-20cm? [15:09:25] Lasers are now visible [15:10:00] vaguely remembered... [15:10:12] LAT : 34.391417 , LON : -51.77425 , DEPTH : 2408.0945 m, TEMP : 3.29873 C, SAL : 34.96099 PSU, DO : 8.1596 mg/l [15:12:06] dhugallindsay leaves the room [15:12:07] @rhian and scott: A foot or two makes the neoteuthid more likely. If it was a couple of inches I could argue for Archi. [15:12:49] noellehelder leaves the room: Replaced by new connection [15:15:12] LAT : 34.391354 , LON : -51.774162 , DEPTH : 2409.9215 m, TEMP : 3.28339 C, SAL : 34.96872 PSU, DO : 8.17003 mg/l [15:18:09] michaelvecchione leaves the room [15:20:13] LAT : 34.391421 , LON : -51.774046 , DEPTH : 2407.8259 m, TEMP : 3.29306 C, SAL : 34.96022 PSU, DO : 8.1606 mg/l [15:21:03] How big is athat rock? are the Lasers scalers on? [15:21:32] they're off screen with the zoom - it was about 20cm or so [15:22:31] bramleymurton leaves the room [15:23:57] nice try [15:25:13] LAT : 34.391326 , LON : -51.774071 , DEPTH : 2407.4972 m, TEMP : 3.29451 C, SAL : 34.96271 PSU, DO : 8.13796 mg/l [15:25:24] noellehelder leaves the room [15:25:39] bramleymurton leaves the room [15:26:37] tinamolodtsova leaves the room [15:27:48] anyone know how endemic these corals and sponges are to each individual seamount or are there high levels of homogeneity and hence connectivity ? [15:28:08] Chris K earlier IDed this as Rhabdopectella [15:29:29] bramleymurton leaves the room [15:29:35] Small Iridogorgia perhaps to lower right [15:30:14] LAT : 34.391381 , LON : -51.774173 , DEPTH : 2401.4475 m, TEMP : 3.32368 C, SAL : 34.95081 PSU, DO : 8.1822 mg/l [15:31:00] Don't understand why you can't hear me. [15:31:15] Nothing has changed on my end and I'm speaking in my very loud voice! [15:31:42] nice bramble, quite large, sparsely branched [15:32:17] kelseyviator leaves the room [15:32:17] Holothurian on left on sediment [15:32:56] @Bram, in our paper of last year we show that the assemblages are restricted to groups of seamounts, not any one seamount. [15:34:19] @Bram: we published on this for the New England/Corner Seamounts system: https://www.int-res.com/abstracts/meps/v397/p25-35/ [15:34:45] thnaks Scott [15:34:47] jasonchaytor leaves the room [15:35:15] LAT : 34.391351 , LON : -51.774077 , DEPTH : 2399.6433 m, TEMP : 3.29384 C, SAL : 34.96239 PSU, DO : 8.16855 mg/l [15:36:49] haroldcarlson leaves the room [15:38:32] scottfrance leaves the room [15:40:16] LAT : 34.391345 , LON : -51.773941 , DEPTH : 2398.6845 m, TEMP : 3.31135 C, SAL : 34.96157 PSU, DO : 8.18718 mg/l [15:42:13] yes ... synaphobranchid [15:42:16] Based on a brief review of my database our deepest dives on our previous trip to this region were at 2153 meters (on Goode Peak, Corner Seamount); most of our dives were shallower than 1900 m. This supports Les' earlier comment that the communities we observe here may look different to our first impressions because of the depth zones. [15:43:27] yes ... energetically conservative for sinusoidal swiming [15:43:45] hi rhian. hi everyone! great expedition so far. my lab group is currently watching the video [15:44:17] Hi Andrea! [15:44:19] Hey Andrea! [15:45:16] Hi Andrea, sounds like fun! [15:45:18] LAT : 34.391312 , LON : -51.773958 , DEPTH : 2397.0715 m, TEMP : 3.30974 C, SAL : 34.96045 PSU, DO : 8.17554 mg/l [15:45:37] say hi to everyone from the ship! [15:46:13] can we ask you a question or two? we have a few summer interns [15:46:40] sure thing! [15:46:41] I don't see anything particularly angular here... I realize the first priority is something loose... [15:46:57] Hi Andrea... happy that the interns can participate virtually. if your interns have an interest in chatting with MBARI interns (18), let me know [15:47:15] Yes, not as angular as we've had before for sure [15:47:25] @george that would be great! [15:47:50] how many interns do we have listening in? [15:48:42] 5 interns, 3 postdocs, 3 grad fellows [15:48:49] haroldcarlson leaves the room [15:49:22] questions: are the rocks made of basalt? what kind of analyses do you plan on performing? why a squeeze test? [15:49:27] bramleymurton leaves the room [15:50:17] LAT : 34.39131 , LON : -51.774017 , DEPTH : 2397.707 m, TEMP : 3.31546 C, SAL : 34.96086 PSU, DO : 8.14217 mg/l [15:50:21] @andrea sent you an email [15:50:48] michaelvecchione leaves the room [15:50:48] remind me, are the lasers 10 cm? [15:51:01] @andrea yes, 10 cm [15:51:05] Just curious if there is any more discussion about the 8.18 mg/l DO measurements coming in on okexnav. Just seems too high to be real. [15:53:08] leswatling leaves the room [15:53:58] @Chris: I'm told is apparently a conversion thing... Units differ on different screens. But I agree, this seems a high value. [15:54:06] kevinkonrad leaves the room [15:54:07] agree, looks like carbonate sediments loosely cemented by manganese oxides [15:54:15] christopherkelley leaves the room [15:54:25] agreed - looks like chalk covered in FeMn crusts [15:55:01] @christopher it does seem high, that 8 mg/l DO would be about 70% saturation which seems really high; perhaps good mixing? was there an oxygen minimum on the way down? [15:55:05] several of the peaks in this group have carbonate rocks on them. [15:55:09] @Chris: maybe because we are so close to source of NADW the [O2] is high. You are used to the end product in the central Pacific! [15:55:13] peterauster leaves the room [15:55:17] LAT : 34.391386 , LON : -51.773996 , DEPTH : 2397.7089 m, TEMP : 3.31724 C, SAL : 34.96144 PSU, DO : 8.16002 mg/l [15:56:28] bramleymurton leaves the room [15:56:34] jasonchaytor leaves the room [15:57:35] andreaquattrini leaves the room [15:57:54] is manganese crust deposition episodic? Depeninding on water mass shifts, shifts in hydrothermal activity? [15:58:02] Are ml/L and mg/L Dissolved oxygen one in the same? No - 10mL dissolved O2 /L is about 13.3 mg dissolved O2 /L. Here's an explanation: The concentration unit ml/L is equivalent to parts per thousand; i.e. for every 1 mL of O2, there are 1000mL = 1000mg of water. [15:58:05] @christopher I wonder if the sensor is accurate? be interesting to see the oxygen levels at the surface and the trace on the descent to see if it is responding. [15:58:32] we are used to seeing O2 levels in ml/l, and that value here should be around 5 [15:58:53] @George and Scott: I didn't watch the descent so don't know where they hit the lowest values but it is my understanding there isn't anything close to an OMZ like there is in the Pacific. Perhaps Scott's suggestion is what is going on. [15:59:01] Which it is. okexnav is showing mg/L, hence the "unit issue" that has been mentioned. [15:59:52] a Mars spacecraft crashed due to the mix-up in units.... just sayin.... [15:59:57] here's a nice little chart that allows you to determine % saturation if you know the temp and the concentration in mg/L http://dep.wv.gov/WWE/getinvolved/sos/Documents/SOSKit/DOSaturation.pdf [16:00:10] are they drifts ot pterrapod shells? [16:00:15] kiramizell leaves the room [16:00:17] LAT : 34.391366 , LON : -51.773678 , DEPTH : 2394.2724 m, TEMP : 3.32446 C, SAL : 34.96231 PSU, DO : 8.16188 mg/l [16:00:37] andreaquattrini leaves the room [16:01:05] any discussion as to why so many dead sponges? interns are curious [16:01:15] So Les, I haven't done the math to figure out what 8.18 is in ml/l, but whatever it is would still seem to be too high. [16:01:32] (1) the entire literature on dissolved oxygen is unnecessarily confusing because of the "unit issue". (2) Once you get away from the coast (e.g., Mississippi outflow) OMZs in the western N Atlantic are not physiologically limiting. [16:01:39] Jason noted yesterday the sensors were showing something around 5. [16:02:03] and 5 ml/l is pretty normal here [16:02:21] On camera 3 you can see value is 5.6 ml/L [16:02:57] Thanks George. Given Scott's comment, what is being recorded for the data package? Is it what the sensors are actually showing on the ship or is it what we are seeing? [16:03:13] bramleymurton leaves the room [16:03:28] and judging from the T and S the water mass here is a mix of LSW and Upper NADW, probably more of the latter [16:03:39] thank you rhian :) [16:04:38] Can't see the values well enough on my display of camera 3 Scott. Anyway, that sounds more reassuring. [16:04:44] @Chris: I'm still unclear on that (we had a bit of a discussion yesterday). What I see is that okexnav is showing us the confusing mg/l, but the ROV sensors shown on camera 3 are in ml/L. I think the latter will be the exported dataset. Perhaps we can check an earlier dive on SeaTube, but even there there was some question about what data are used. [16:05:17] LAT : 34.391361 , LON : -51.773646 , DEPTH : 2376.1013 m, TEMP : 3.3589 C, SAL : 34.96322 PSU, DO : 8.13841 mg/l [16:05:30] Scott, your grad students are going to quit the program when they get to annotating this dive. [16:05:36] andreaquattrini leaves the room [16:06:00] haha. They are actually live annotating, so they know what they are in for. [16:06:21] @cindy - there are hiatuses in FeMn crust deposition, but they are more usually linked to major changes is redox. There's usually a steady supply of Mn to deep ocean. Hydrothermal activity can increase growth rates, and water mass shifts can change the chemistry (especially trace metals) but not common to stop oxide deposition. [16:06:24] @Chris: in fact, this isn't "as bad" as the million mounds area off Florida. [16:06:29] kelseyviator leaves the room [16:06:34] any live octocorals yet today? [16:06:41] iscwatch leaves the room: Replaced by new connection [16:06:45] @Chris by "bad" I of course mean fantastically diverse! [16:06:53] @Andrea: absolutely [16:07:00] That's true. Andrea, yes, we've seen bamboos, a chrysogorgiid, and a primnoid [16:07:20] Also Anthomastus, zoanthids... [16:07:34] But no question sponges are ruling the day. [16:07:36] thank you [16:07:47] Did anyone note those large antler-like sponges? [16:07:48] michaelvecchione leaves the room [16:08:04] upasanaganguly leaves the room [16:08:10] Didn't see them. Will pay more attention [16:08:12] Mybe one dead one below, and we saw a couple of live ones earlier [16:08:25] Its likely that a steep wall like this is caused by the collapse of the flank of the seamount -what we call 'sector collapse' and can happen at any time, but often during the growth of the seamount. [16:08:27] I saw those! [16:09:19] Please point them out if you see any more Andrea. I am now quite curious [16:09:28] I mean Rhian [16:09:34] bramleymurton leaves the room [16:09:47] iscwatch leaves the room [16:09:52] primnoid [16:09:57] Calyptrophora...? [16:10:17] Looks like a non-chirstylid squat lobster [16:10:19] LAT : 34.391268 , LON : -51.773821 , DEPTH : 2362.6764 m, TEMP : 3.33296 C, SAL : 34.96423 PSU, DO : 8.17179 mg/l [16:10:25] *chirostylid [16:10:34] That group is not host specific [16:10:36] demosponge around the holdfast [16:10:38] this is the second time we have seen these two corals together... maybe third... [16:10:39] iscwatch leaves the room [16:10:47] Chrysogoriga tricaulis [16:10:52] jasonchaytor leaves the room [16:10:56] Lots of bramble in background [16:11:31] bramble in the background [16:11:42] FYI, I just checked on sensor data associated with earlier dive (dive 2) on SeaTube, and O2 readings are in ml/L, so there won't be the confusion we are experiencing here. [16:11:50] remind us please what kind of coral the bramble is? It is live, right? [16:11:54] Ah, its a farreid I think [16:12:06] Yes, bramble is a live Isididae (bamboo coral) [16:12:32] Looks like it is the one with few (or no) nodes [16:12:44] noellehelder leaves the room [16:12:48] this one is a Chonelasma like yesterday [16:13:12] there are three species of brambles that we have collected, all in different clades so probably in different genera. So, bramble is a growth form only that has shown up more than once [16:13:23] andreaquattrini leaves the room [16:13:29] Wonderful site. Great job picking where to dive. [16:14:05] thanks Scott, Les. I find it challenging to learn these names/types [16:14:06] this area is looking more and more like the deep communities on some of the New England seamounts rather than anything we are used to seeing at Corner Rise [16:14:15] same genus Chonelasma [16:14:28] well @Cindy, it has taken us a couple of decades! [16:15:01] andreaquattrini leaves the room [16:15:04] The bramble we are seeing here may be the one that so far has only been sampled from Nashville Seamount at 2218 and 2246 m depth. [16:15:18] LAT : 34.391509 , LON : -51.773951 , DEPTH : 2366.2087 m, TEMP : 3.33491 C, SAL : 34.96368 PSU, DO : 8.17747 mg/l [16:15:34] @Les: agree with you comment on similarity to NES. May be all about the depth! [16:15:49] Will be great to compare to what we see tomorrow farther north. [16:16:27] bramleymurton leaves the room [16:16:52] can you zoom lower yellow sponge? [16:16:58] Back to the bramble. I noted that we have 2 collections of this genetic type ("J3a"), both from Nashville Seamount. I find it interesting that they came from such a similar depth. [16:17:19] yes @Scott, a good opportunity to update what has been published.... [16:17:39] another chryso [16:17:57] kiramizell leaves the room [16:18:00] jaymesawbrey leaves the room [16:18:03] that's it the large one [16:18:16] The large vase in the center [16:18:41] @Scott, I think the species are tracking the water mass features... [16:19:06] andreaquattrini leaves the room [16:19:21] This is a rossellid, but not sure what genus. Could be Bathydorus. These sponges can form colonies with multiple vases [16:19:30] Thanks very much for that [16:20:01] @Chris: I find it fascinating the varying potential for morphology among some of the Hexacts. Some seem so fixed, and others so plastic. [16:20:18] LAT : 34.391332 , LON : -51.773803 , DEPTH : 2366.0112 m, TEMP : 3.35368 C, SAL : 34.96209 PSU, DO : 8.18146 mg/l [16:20:25] kimberlygalvez leaves the room [16:21:13] Agree Scott. Perhaps its in response to water flow rates and directions. Some are better at tayloring their colony shapes to maximize filtering where as others may be more constrained. [16:22:09] @Chris: the often interesting interaction of genetics and environment. [16:22:44] Also, the dogma is that funnel shaped sponges can take advantage of the venturi effect over the top of their central osculi, accelerated the flow rate through the tissue. Also just saw a dead Aphrocallistes [16:24:01] Bigger J3 isidid, e.g. possibly bramble growing out of its gangly bramble phase. [16:24:29] @scott is the J clade all Jasonisis? [16:24:44] Thanks Rhian. I was going to ask [16:24:54] We have sampled in the Bahamas 3 colonies that genetically match the Nashville bramble, but that are larger and have more "regular" colony morphology. [16:24:57] kiramizell leaves the room [16:25:19] LAT : 34.391374 , LON : -51.77378 , DEPTH : 2360.9759 m, TEMP : 3.34846 C, SAL : 34.96322 PSU, DO : 8.18278 mg/l [16:25:48] Hmmmmmmmm. Maybe a rossellid but I really don't know. Thanks for the closeup [16:25:53] @Andrea: All we can currently say is thta Jasonisis is the only member of that clade that has yet been formally described. But I would say based on the morphology and te subclades that there will eventually be more than just that one genus. [16:26:34] I don't remember either Rhian. [16:26:36] kelseyviator leaves the room [16:26:38] @Andrea: but they would all have to be newly described genera, not existing ones. [16:28:08] leswatling leaves the room [16:28:08] andreaquattrini leaves the room [16:29:10] I think that is some type of Euretid [16:29:39] Corallium ahead? [16:30:19] LAT : 34.391298 , LON : -51.773736 , DEPTH : 2359.2792 m, TEMP : 3.36196 C, SAL : 34.96319 PSU, DO : 8.18173 mg/l [16:30:56] Amen Scott. I love seeing how these communities transition as you go upslope [16:31:13] The plate one? [16:31:27] Not sure. Can you zoom [16:31:45] But what about this big one... [16:31:51] Farredidae? [16:32:03] *Farreidae [16:32:14] Wow, ok this needs a bit of thinking [16:32:44] I think it could be an euplectellid, perhaps Hertwigia. [16:33:20] But it could also be a farreid as Scott suggested or even a euretid. [16:33:27] @scott thanks [16:33:40] It herts to say [16:33:42] @Chris: so it could be anything! [16:33:49] @Chris: Nice! [16:33:57] @Chris: have been missing those [16:34:13] Exactly Scott. Lets go Hexactinellida for now [16:34:55] michaelvecchione leaves the room [16:35:02] I don't suppose there is any chance to grab a piece? Don't mean to be greedy since you got sponges yesterday [16:35:19] LAT : 34.391328 , LON : -51.773727 , DEPTH : 2356.9459 m, TEMP : 3.38039 C, SAL : 34.96443 PSU, DO : 8.15207 mg/l [16:35:22] Can we collect a sample of that unknown sponge? [16:35:32] cindyvandover leaves the room [16:36:14] kelseyviator leaves the room [16:36:38] This is clearly a sponge dominated community, so a sponge collection is warrented. [16:37:04] Even touching it and seeing how it responds would be helpful but a piece would be great. No idea if it might be brittle [16:37:32] If its a euplectellid, no. if its a farreid, yes. [16:38:07] Upasana just shared a paper thta had an image. Chris, could this be a Hexasterophora [16:38:18] Which would suggest pretty hard and brittle [16:38:51] Thanks. So has it been collected or is the paper just based on video imagery? [16:39:34] No collection. Just an image. Based on OkEx images! You must have the paer, Henry is a co-author. https://frontiersinzoology.biomedcentral.com/articles/10.1186/s12983-017-0191-3 [16:39:53] Have a look at figure 1 [16:39:57] kiramizell leaves the room [16:40:20] LAT : 34.391301 , LON : -51.77368 , DEPTH : 2357.1116 m, TEMP : 3.3926 C, SAL : 34.96481 PSU, DO : 8.1549 mg/l [16:40:36] BTW, that is only a subclass so it is not like I'm offering a very specific ID! [16:41:08] leswatling leaves the room [16:42:10] Is this similar to Figure 1B in the paper? [16:42:22] I looked at the paper and its one I coauthored with Martin Dohrman and others. I provided those images which are from Pacific sponges. [16:42:43] I don't think it is similar to any of those. [16:43:00] @Chris: see! I knew you'd be familiar! [16:43:27] @Chris: I meant only that the basic architecture resembled, e.g. the euretid [16:44:10] I think it would be good to grab a piece of the bamboo while we are here. [16:44:54] @Les: you mean the colony to the left? [16:45:20] LAT : 34.391365 , LON : -51.773635 , DEPTH : 2356.6416 m, TEMP : 3.40021 C, SAL : 34.95529 PSU, DO : 8.15942 mg/l [16:45:36] So I think it is soft and therefore a euplectellid, possibly Hertwigia [16:45:42] yeah, the tall one [16:45:58] bramleymurton leaves the room [16:46:06] @Kim: do you see the request to clip the bamboo before we leave? [16:46:10] But it could also be some other genus in that family. It is a very good collection so many thanks [16:46:12] They have to come back to open the biobox, but we can look out - bramble forms? [16:46:16] Good idea if we are stable here. [16:46:40] I mean stable with respect to ship movement [16:46:41] Yes I will ask, is there a specific portion of the coral you'd like? [16:46:44] based off what we saw [16:46:58] WE would want at least one branch point. [16:47:43] Re: bramble: the question at issue is whether this larger colony is a more fully grown bramble, or something different. So we aren't looking for "just any bramble" [16:48:14] bramleymurton leaves the room [16:48:22] correct @Scott [16:48:33] how does a bramble become a more 'organized' bamboo? branches fall off? [16:48:58] emilycrum leaves the room [16:49:05] @Cindy, I think with this one is that it just starts to grow upward [16:49:16] @Cindy: that or it simply grows so large we are ignoring the small branches at base. We should get a good close look at what is going on here at the base. [16:49:41] That is, is there evidence of lost small branches [16:49:57] At least that is what I think we have been seeing. The base looks very like the brambles we have seen before... and what Scott said....haha [16:50:21] LAT : 34.391249 , LON : -51.773738 , DEPTH : 2356.0507 m, TEMP : 3.38705 C, SAL : 34.96498 PSU, DO : 8.13304 mg/l [16:50:46] do all bramble morphs change shape as they grow? I had been thinking the bramble corals were a different species, but now I think you mean not. [16:52:20] there are three different brambles, and only this one seems to do this upward growth. But then, maybe this isn't a bramble at all but a separate species [16:53:40] andreaquattrini leaves the room [16:53:43] something happened at the base of this one [16:54:07] haroldcarlson leaves the room [16:55:22] LAT : 34.391305 , LON : -51.773681 , DEPTH : 2356.496 m, TEMP : 3.39926 C, SAL : 34.98392 PSU, DO : 8.19221 mg/l [16:55:31] It doesn't need to be so specific! Whatever is easiest for the pilot to reach so we don;'t have to spend time orinting the vehicle and arm to get a specific branch [16:55:47] It settled on a fossil coral, you can see it through the calcification [16:56:36] Tenative ID for the sample? [16:56:43] also, I will note that we know the growth forms, from young to old colony, of only a handful of octocorals. Maybe only three or four... [16:57:03] Tentative ID Keratoisis J3 clade [16:57:26] Thanks! [16:57:51] @Les: I think that is avery important point. So many of these coral we are guessing at (sponges to) because we don't have good knowledge of development. [16:58:33] The obvious case where we do - Metallogorgia, and perhaps even "Tridentisis" - shows they can be dramatically different if you don't know what you are looking for. [16:59:06] FYI, I think I am seeing nodal branching, or am I imaging that? [16:59:25] Couldn't see any nodes to confirm that [16:59:26] *imagining [16:59:44] If there are "no" nodes, that would be even more exciting! [16:59:47] We can confirm when we have it in the lab [17:00:14] @Kim: hah! I don't want to wait thta long! ;-) [17:00:22] LAT : 34.391324 , LON : -51.773727 , DEPTH : 2356.4823 m, TEMP : 3.44454 C, SAL : 34.95014 PSU, DO : 8.10253 mg/l [17:00:40] Patience grasshopper [17:01:14] kelseyviator leaves the room [17:02:44] I thought you were too young to know that TV show Rhian [17:03:07] Hah, you flatter Chris! [17:04:45] @Les: although I don't believe this is an S1 clade isidid, the very long distances between branch point are similar. [17:05:19] thomasmorrow leaves the room [17:05:23]