[03:19:57] stevenauscavitch leaves the room [08:03:16] pierrejosso leaves the room [11:37:08] ***TEST - EX2104 - DIVE03*** [11:54:31] EX2104_DIVE03 ROV powered off [12:30:39] EX2104_DIVE03 ROV Launch [12:40:34] EX2104_DIVE03 ROV on Surface [12:41:25] EX2104_DIVE03 ROV Descending [12:42:14] LAT : 33.678508 , LON : -52.993526 , DEPTH : 13.3895 m, TEMP : 26.70915 C, SAL : 37.09419 PSU, DO : 6.78171 mg/l [12:47:15] LAT : 33.679851 , LON : -52.993571 , DEPTH : 82.1068 m, TEMP : 20.5561 C, SAL : 36.77607 PSU, DO : 7.50307 mg/l [12:52:16] LAT : 33.68146 , LON : -52.994005 , DEPTH : 233.8773 m, TEMP : 18.96483 C, SAL : 36.63403 PSU, DO : 6.91116 mg/l [12:57:16] LAT : 33.681767 , LON : -52.99408 , DEPTH : 400.7983 m, TEMP : 17.60922 C, SAL : 36.42043 PSU, DO : 6.26191 mg/l [12:58:58] dhugallindsay leaves the room [13:01:38] hi all what time to the bottom? [13:01:52] 70 minutes to bottom [13:01:56] too soon ;-)? [13:02:12] Thanks Jason! how is sea? [13:02:16] LAT : 33.681569 , LON : -52.99422 , DEPTH : 551.8551 m, TEMP : 15.38692 C, SAL : 36.04997 PSU, DO : 5.78319 mg/l [13:03:03] krill [13:03:13] it looked okay this morning at launch...I am sitting in a cabin in Maine, so it is very good for me! :-) [13:03:57] cyclothone? [13:07:17] LAT : 33.681256 , LON : -52.994261 , DEPTH : 710.6004 m, TEMP : 11.84091 C, SAL : 35.52929 PSU, DO : 5.01688 mg/l [13:08:31] Atolla vanhoeffeni? [13:08:54] Video really choppy so only get a few frames here and there for IDing animals.. [13:10:19] Forskalia formosa? [13:10:41] Serrivomer [13:11:24] Aeginura grimaldi? [13:11:42] Aeginura grimaldii [13:11:49] two of them [13:12:04] Beroe? [13:12:17] LAT : 33.680951 , LON : -52.994371 , DEPTH : 871.3621 m, TEMP : 8.6469 C, SAL : 35.20715 PSU, DO : 5.20387 mg/l [13:14:18] Solmissus [13:15:03] ctene [13:15:49] shrimp [13:17:07] Solmissus? [13:17:17] LAT : 33.680512 , LON : -52.994424 , DEPTH : 1036.0451 m, TEMP : 6.71674 C, SAL : 35.16132 PSU, DO : 6.45005 mg/l [13:17:36] Histioteuthis??! [13:17:49] madalynnewman leaves the room [13:17:51] big larvacean [13:22:18] LAT : 33.680227 , LON : -52.994575 , DEPTH : 1195.3581 m, TEMP : 5.59571 C, SAL : 35.11395 PSU, DO : 7.40594 mg/l [13:25:28] jasonchaytor leaves the room [13:26:59] mesochordeus? [13:27:18] LAT : 33.679867 , LON : -52.994608 , DEPTH : 1360.3366 m, TEMP : 4.90953 C, SAL : 35.06191 PSU, DO : 7.92683 mg/l [13:28:31] trachymedusae [13:29:53] physonect [13:30:12] Rhopalonematid [13:30:59] chaete [13:32:05] cutlassfish? [13:32:19] LAT : 33.679536 , LON : -52.994797 , DEPTH : 1516.329 m, TEMP : 4.45907 C, SAL : 35.01672 PSU, DO : 8.19091 mg/l [13:32:24] gempylid? [13:35:10] noellehelder leaves the room [13:35:26] switching to camera 2 [13:36:08] pretty dark... Some lights turned off or not deployed? [13:36:20] Usually a lot brighter than this.. [13:37:12] hi Dhugal - they're doing the light calibrations right now [13:37:19] LAT : 33.679163 , LON : -52.994927 , DEPTH : 1663.481 m, TEMP : 4.22678 C, SAL : 35.00171 PSU, DO : 8.26867 mg/l [13:37:24] which usually involves dimming and setting lights [13:37:40] on the TMS? [13:37:43] should be back to normal shortly [13:37:56] Not just the ROV? [13:40:02] ~~ 30 mins to bottom [13:40:10] ghost tail? [13:40:30] brown Bathykorus!!!!!!!!!!!!! [13:40:33] !!!!!!!!!!! [13:40:35] !!!!!!!!!!!!! [13:40:39] in camera 2 [13:41:07] 2nd ever sighting? [13:42:20] LAT : 33.678788 , LON : -52.995032 , DEPTH : 1813.4167 m, TEMP : 4.08946 C, SAL : 35.00532 PSU, DO : 8.19352 mg/l [13:42:52] primary tentacles bent at right angles. a little small but in focus for several seconds. Need to pull original quality video! [13:44:20] halicreatid? maybe.... [13:45:31] oik [13:45:52] probably a bit of a lag between video and comments here.. [13:46:31] oik [13:47:21] LAT : 33.678351 , LON : -52.99512 , DEPTH : 1960.7481 m, TEMP : 3.88463 C, SAL : 34.98831 PSU, DO : 8.23503 mg/l [13:47:34] big larvacean? narco? [13:48:31] camera one still has no black water [13:48:52] EX Chat Bot is now listening for nav data from okexnav [13:49:49] EX Chat Bot leaves the room [13:50:10] Hey ExChatBot, play Spamalot [13:51:01] ~~ 20 minutes to bottom [13:51:17] jasonchaytor leaves the room [13:52:20] EX Chat Bot is now listening for chat data from this chatroom [13:52:22] LAT : 33.677963 , LON : -52.995147 , DEPTH : 2107.9527 m, TEMP : 3.773 C, SAL : 34.99749 PSU, DO : 8.12752 mg/l [13:53:08] EX Chat Bot leaves the room [13:54:33] EX Chat Bot is now listening for chat data from this chatroom [13:57:21] LAT : 33.677693 , LON : -52.995238 , DEPTH : 2256.7234 m, TEMP : 3.53371 C, SAL : 34.97425 PSU, DO : 8.21415 mg/l [14:02:22] LAT : 33.677306 , LON : -52.995356 , DEPTH : 2405.316 m, TEMP : 3.43389 C, SAL : 34.9693 PSU, DO : 8.19912 mg/l [14:02:39] pierrejosso leaves the room [14:05:20] seems like camera one might be usable soon [14:05:51] switching back to camera one [14:07:22] LAT : 33.677075 , LON : -52.995264 , DEPTH : 2551.9509 m, TEMP : 3.31691 C, SAL : 34.96449 PSU, DO : 8.11747 mg/l [14:07:26] Have already video'ed one undescribed species and haven't eben reached the bottome yet [14:07:35] A jelly-eater called Bathykorus [14:07:37] Hi everyone [14:07:39] hi all! [14:07:39] noellehelder leaves the room [14:07:49] The only species currently described is from the Arctic [14:08:18] This is the prelude for a great dive then Dhugal! [14:08:31] Should be and always is [14:08:39] :) [14:08:41] Looks crowded in that control room! [14:09:01] bits of siphonophores? [14:09:10] Good morning! [14:09:40] @Scott as long as we social distance, it should be fine [14:09:46] :) [14:09:51] @Kim: Hmmm... [14:10:01] good morning peter [14:10:48] morning! [14:12:22] @Dhugal: I added your Bathykorus observation to SeaTube annotation so it is easy to find later. [14:12:23] LAT : 33.676471 , LON : -52.995001 , DEPTH : 2578.9957 m, TEMP : 3.2424 C, SAL : 34.96 PSU, DO : 8.13667 mg/l [14:12:40] Thanks very much Scott [14:14:28] andrewobrien leaves the room [14:14:29] 50m off bottom [14:15:55] This dive at this depth I am hoping we will find Botrynema brucei, a halicreatid trachymedusa that is roundish but with a stiff gelatinous projection on the top of the bell. Like the teat of a baby bottle. Have no records from the North Atlantic yet but I would imagine it is here and at this depth [14:16:19] good to know - we'll be on the lookout! [14:16:22] At least my 3D habitat models assume that it is ;-) [14:16:22] EX Chat Bot leaves the room [14:16:42] Should be between 1800-2600m or so [14:16:54] EX Chat Bot is now listening for chat data from this chatroom [14:17:02] more probably shallower than 2300m [14:17:10] EX Chat Bot leaves the room [14:17:23] LAT : 33.676406 , LON : -52.995167 , DEPTH : 2621.6251 m, TEMP : 3.22748 C, SAL : 34.9596 PSU, DO : 8.167 mg/l [14:17:34] EX Chat Bot is now listening for chat data from this chatroom [14:18:12] Wonder if this seamount will also be overrun with zoanthids.. [14:18:33] haroldcarlson leaves the room [14:18:42] Pests... but don't tell James I said that! [14:18:55] it will be interesting to see [14:19:08] bottom in sight [14:19:36] pests) [14:19:47] we are shallower than yesterday? [14:19:48] I actually did not think there were more zoanthids than normal. I wonder if you all focused more on the zoanthids because there wasn't huge coral diversity... [14:19:52] soft sediment [14:19:55] EX2104_DIVE03 ROV on Bottom [14:20:11] seeing two species on the one coral was new to me [14:20:17] pierrejosso leaves the room [14:20:25] 2641 m [14:20:28] But only probably there because it was dead? [14:20:32] Scott, it was more zoantids. [14:20:48] Relative to the HYPAC on camera 3, is the tack to the right? e.g. heading to the steeper bathymetric lines? [14:21:08] I want to call that last seamount the "coral graveyard" [14:21:34] .. with zomby-zoanthids [14:21:36] So we are likely in the flat area at the bottom of the slope and hopefully we'll see steeper exposed rock a little later. [14:22:03] Zombyanthid Seamount site [14:22:13] ;-) [14:22:24] love it) [14:22:25] LAT : 33.676304 , LON : -52.994995 , DEPTH : 2642.1698 m, TEMP : 3.21062 C, SAL : 34.95856 PSU, DO : 8.13419 mg/l [14:23:11] I like soft bottoms [14:23:21] @Tina: someone will have to quantify the zoanthids from the video and compare to other dives to convince me! Nice project for somone. [14:23:33] Might be little benthopelagic medusae on them [14:23:45] Clio everywhere [14:23:53] The key is to compare to a dive where there are lots of available skeleton to settle on. [14:23:58] Clio pyramidata [14:24:29] and others [14:24:39] peterauster leaves the room [14:25:19] Exactly, there were way more zoanthids because there was a lot of dead coral skeletons still standing upright [14:26:36] You don't think the zoanthids contributed to coral mortality? [14:27:25] LAT : 33.676356 , LON : -52.994982 , DEPTH : 2641.5043 m, TEMP : 3.20667 C, SAL : 34.95839 PSU, DO : 8.13019 mg/l [14:27:35] @Dhugal: thta is not my starting hypothesis. I think they take advantage of exposed surface to settle on. Some may overgrow live coral, but I don't think I've seen a lot of that. [14:28:08] Best examples of the overgrowing ones are on Paragorgia and the "gold coral" on bamboo corals. [14:28:26] Former Gerardia - forget the new name... [14:28:34] Interesting. i just assumed because there is such tight host specificity that the zoanthid would win every time [14:28:51] Not in my opinion, but it could be possible. We did look under some zoanthids that were on Paragorgia and found only bare axis. But I have a specimen of coral from Gulf of Mexico with a little coral growing on it, and under that coral were all the sclerites from the host coral. So it seems in that case the little coral was a parasite [14:29:38] Yeah, the gold coral of the Pacific might be killing the host bamboo, but again the evidence for that is not strong [14:29:48] Looked a bit like a tumbled over sponge [14:30:23] Looks like some meandering tracks in the seds [14:30:32] ripples in sed [14:30:33] Burrowing urchins? [14:31:10] wondering if it is ripples generated by changing current directions, but could be tracks [14:31:38] noellehelder leaves the room [14:32:01] sediment looks quite mixed with a lot of coarse-grained material [14:32:26] LAT : 33.676207 , LON : -52.995146 , DEPTH : 2640.7567 m, TEMP : 3.20383 C, SAL : 34.96011 PSU, DO : 8.12221 mg/l [14:32:31] very coarse [14:32:36] ripples seems to be aligned with current direction indicated by the seapen, so probably lateral flow currents [14:32:38] kelseyviator leaves the room [14:33:48] meganmcculler leaves the room [14:35:28] Sponge [14:36:13] any guesses on sed thickness? [14:36:52] probably 10's of centermeters at least [14:37:26] LAT : 33.6763 , LON : -52.994869 , DEPTH : 2638.5389 m, TEMP : 3.20477 C, SAL : 34.95768 PSU, DO : 8.18638 mg/l [14:37:36] is there a black coral on that rock? [14:37:49] yes - @scott any idea of species? [14:38:05] mysid [14:38:13] noellehelder leaves the room: Replaced by new connection [14:38:25] kelseyviator leaves the room [14:38:28] Bathypathes, I think. But my video has frozen. [14:38:47] it looked like a white bathypathes - do they come in white?? [14:39:35] @Rhian: yes [14:39:48] I'm actually still frozen on it! [14:41:45] another pen [14:42:27] LAT : 33.676081 , LON : -52.994916 , DEPTH : 2630.265 m, TEMP : 3.21346 C, SAL : 34.95929 PSU, DO : 8.1099 mg/l [14:42:32] Cup coral! [14:43:13] Caryophyllid or dendrophyllid? [14:43:14] Is that an ascidian? [14:43:29] These little circular patches look like sponges to me [14:44:07] @Scott, encrusting sponges? [14:44:10] With a single squirt? [14:44:33] @Rhian: SeaTube "demands" we commit to a family when entering "cup coral" (at least using the WoRMS taxonomy). Do you know what family that was? I guessed Caryophyllidae [14:45:03] caryophyllidae [14:45:07] Thx [14:45:21] it's almost certainly one of those being circular, but it could also be a javania.......bummer it makes you choose one..... [14:45:50] @Kim: I think they can be classified encrusting. I feel like we collected a rock with some on it back in 2019 at Joanna's direction. Does that sound familiar? [14:45:58] notable current scour all around that errant boulder is evidence of multidirectional and substantial currents are active here at times - if not today [14:46:53] @Scott, I can't recall exactly, but they do look familiar when Shirley Pomponi and Christi chimed in a few times during 1907 [14:47:06] Can't say if it was collected or not. [14:47:27] LAT : 33.676176 , LON : -52.994679 , DEPTH : 2625.1247 m, TEMP : 3.23349 C, SAL : 34.96008 PSU, DO : 8.13586 mg/l [14:47:47] 1907? You guys been around longer than me ! ;-) [14:48:03] :) [14:48:12] What species might we find burrowing in the sediment? Marine worms or other species? [14:48:18] ahh dive number maybe not year.. [14:48:21] umbellula [14:49:12] yes, expedition number [14:49:23] Quite a few mysids around. Inder a large input of marine snow [14:49:30] infer [14:49:42] Just a note on the "just another Umbellula". Phylogenetics show there are at least 3 unrelated genera that are all being referred to as "Umbellula", plus two others that look very similar to the none expert. So I don't think we should dismiss them so quickly. [14:50:00] *non-expert [14:50:17] I didn't think I was dismissing them sorry! [14:50:31] Like many of the corals, we get fooled by taking on a cursory glance and so miss much of the actual biodiversity. [14:50:44] kelseyviator leaves the room [14:50:46] seems like buried pavements of FeMn crusts [14:51:44] nice hydroids [14:51:49] Is that a stalked sponge behind? [14:51:50] meganmcculler leaves the room [14:52:27] LAT : 33.676418 , LON : -52.994475 , DEPTH : 2619.456 m, TEMP : 3.23333 C, SAL : 34.95901 PSU, DO : 8.08577 mg/l [14:52:31] I think there is a small branched foram to back left, if that is what you mean Peter [14:52:51] Behind this glass sponge to the left of the base [14:53:14] Could be a scale worm on the inside, but could also be an amphipod. Hard enough to identify the good views let alone the shadows! [14:53:17] yes peter - there is a small stalked sponge there [14:53:25] For sure @scott [14:53:57] Cyclocordyla? We see these in the Gulf of Maine - Wilkenson Basin [14:54:12] in the northeast Atlantic most of the rissoid snails collected from seamounts were new species, so these are likely to be as well [14:54:58] it is not too large for rissoid? [14:55:05] noellehelder leaves the room [14:55:16] Nice botryoids on the pillows indeed, could we try to snap a fragment from the layer atop the pillows? [14:56:14] @jason - rock sample? Snapping pillows is hard unless we see one really sticking out, but there are some loose ones.... [14:56:35] bamboo? [14:57:28] LAT : 33.676284 , LON : -52.994447 , DEPTH : 2617.812 m, TEMP : 3.23027 C, SAL : 34.96018 PSU, DO : 8.15186 mg/l [14:58:07] the one in th emiddle here maybe? [14:58:54] midnight in Japan and no visible jellies so I might call it a night. Have a good dive! [14:59:39] kensulak leaves the room [14:59:42] it was one just two minute ago. not jelly-jelly, but more tunicate-jelly [14:59:44] Alternative rock target might be on the lower right portion of the screen now. [14:59:55] Could just be broken crust. [15:00:10] leswatling leaves the room [15:00:40] Together with Bram and Kira, we are quite interested in the crusts! But getting some nice igneous rocks is as also essential for dating the whole chain [15:01:13] weve had some great crusts so far on the previous two dives! [15:01:25] Well, not hardened in place evidently... [15:01:59] Vanishing rocks are the hardest to sample. [15:02:29] LAT : 33.676191 , LON : -52.994563 , DEPTH : 2618.839 m, TEMP : 3.23333 C, SAL : 34.96034 PSU, DO : 8.11249 mg/l [15:02:33] must be a good one if it is trying to get away [15:02:51] playing hard to get [15:03:31] rename the biobox the geobox! [15:03:50] it is the rock box! the bioboxes are the white ones! [15:04:22] surprise surprise [15:04:25] ;-) [15:05:22] nice soft touch [15:07:04] worm [15:07:10] you can see very small tracks on the sed surface so some small critters are here [15:07:13] Thank you pilots! [15:07:18] dhugallindsay leaves the room [15:07:27] well done thanks pilots [15:07:28] upasanaganguly leaves the room [15:07:31] LAT : 33.676204 , LON : -52.994506 , DEPTH : 2618.626 m, TEMP : 3.22971 C, SAL : 34.95864 PSU, DO : 8.12587 mg/l [15:08:49] kimberlygalvez leaves the room [15:09:18] peterauster leaves the room [15:09:27] Something like Corymorpha or related [15:09:31] Ectopleura like hydroid [15:09:47] Yes, I have seen growing off of skeleton [15:10:39] beautiful image [15:12:31] LAT : 33.676308 , LON : -52.994497 , DEPTH : 2616.0318 m, TEMP : 3.20845 C, SAL : 34.96347 PSU, DO : 8.14978 mg/l [15:12:44] that is bizarre! [15:13:20] looks like one of those sclerite-less octocorals [15:13:39] it is juvenile of unstalked crinoid - they often have stalk. Baby [15:13:44] haroldcarlson leaves the room [15:13:51] @Les: Don't think I've seen that in an unbranched colony... [15:14:38] christopherkelley leaves the room [15:15:16] no, me either... very weird [15:15:22] kelseyviator leaves the room [15:15:53] if we see that again I wonder if it could be taken with suction [15:16:11] carolynruppel leaves the room [15:16:24] @Tina, yeah you are probably right... didn't think of that [15:16:35] I missed the beginning @Les, which associate were you looking at? [15:16:41] @Scott - wonder what the rate of predation needs to be in order to produce these localized effects ... bet pretty low? [15:16:55] Some type of demosponge, perhaps another Geodia but not sure [15:17:32] LAT : 33.676173 , LON : -52.994439 , DEPTH : 2611.7519 m, TEMP : 3.2306 C, SAL : 34.95982 PSU, DO : 8.15893 mg/l [15:17:43] @Peter: not enough to have completed killed off that bamboo coral, but certainly in bad shape. [15:17:47] down lower on that bamboo was a couple of small things that looked like small octocorals, but Tina noted they were probably baby comatulids, which has a stalk. Scott and I saw that in Aleutians in 2004, but I forgot about it [15:18:17] Yup, there was definitely a juvenile comatulid on that whip. [15:18:37] kimberlygalvez leaves the room: Replaced by new connection [15:19:48] the pinnuled tentacles had me thinking octocoral all the way.... confirmation bias! [15:20:24] Halosaur [15:20:27] This looks like a halosaur to me. [15:20:28] kiramizell leaves the room [15:20:39] halosaur [15:21:02] Very dark... [15:21:19] Don't know the atlantic species. Any thoughts Peter? [15:21:26] such a beauty [15:21:47] never have seen black halosaur [15:21:51] Amen Tina. Very cool fish [15:22:08] In close up those raised fins give me the impression of raised eyebrows, like it is very interested in what this giant source of light is. [15:22:11] Halosauropsis macrochir [15:22:12] a now blind halosaur... wonder how long it takes for their eyes to recover from the light... [15:22:32] LAT : 33.676269 , LON : -52.994459 , DEPTH : 2608.058 m, TEMP : 3.21145 C, SAL : 34.95831 PSU, DO : 8.1197 mg/l [15:23:22] kelseyviator leaves the room [15:23:24] nice crust [15:24:41] noellehelder leaves the room [15:26:51] 2 different sponges... [15:27:31] they do not like to settle on crust [15:27:34] LAT : 33.676141 , LON : -52.994394 , DEPTH : 2604.9724 m, TEMP : 3.21234 C, SAL : 34.96146 PSU, DO : 8.11605 mg/l [15:28:23] Chris K: comments on sponges? [15:29:14] We're at about a 25-30 degree slope here [15:29:22] kelseyviator leaves the room [15:30:37] Hyalonema sponge, or related? [15:31:15] Not Hyalonema. A stalked euplectellid [15:32:02] bamboo [15:32:06] How about Hyalostylus! :-) [15:32:12] Or related [15:32:18] peterauster leaves the room [15:32:26] But yes, as Chris says, a stalked Euplectellid [15:32:33] LAT : 33.676234 , LON : -52.994279 , DEPTH : 2597.8463 m, TEMP : 3.21479 C, SAL : 34.95972 PSU, DO : 8.08017 mg/l [15:32:46] May be a species of Amphidiscella or Hyalostylus as Scott suggested [15:32:54] definitely a growth texture of FeMn oxides from low current strength, botryoids from from accumulation of small particles in between the columns. stronger currents tends to create smoother laminated surfaces [15:33:10] leswatling leaves the room [15:33:14] The curled lip of the sponge is more similar to Amphidiscella [15:34:30] @Thanks Pierre! [15:34:36] Just a note that there is a different branching coral tucked low and to left of the whip. May be just dead skeleton. [15:34:41] possible black coral at the background [15:35:22] kelseyviator leaves the room [15:36:38] Thank you Andrew O'Brien :-) I finally got into the chatroom :-) [15:37:34] LAT : 33.676129 , LON : -52.994442 , DEPTH : 2592.7099 m, TEMP : 3.19431 C, SAL : 34.95812 PSU, DO : 8.12514 mg/l [15:39:49] That is a very nice view of the polyp sclerites. That ewill help for later ID [15:40:15] Is there a reason for why we are seeing these corals growing so spread apart from each other? Is it a random chance of where they are settling based on currents or another factor? [15:42:10] Jasonisis, or at least J clade I think... [15:42:34] LAT : 33.67599 , LON : -52.994292 , DEPTH : 2592.1329 m, TEMP : 3.19336 C, SAL : 34.95973 PSU, DO : 8.11504 mg/l [15:42:52] georgematsumoto leaves the room [15:43:34] haroldcarlson leaves the room [15:44:11] @jocelyn I am no coral expert, but we have certainly been seeing the widely distributed colonization of corals on all the dives so far. Hard to tell if it is an environmental processes, or over time different colonies die off and give the appearance of wider spacing [15:45:41] looks like an abandoned larvacean house [15:46:00] bramleymurton leaves the room [15:47:35] LAT : 33.676182 , LON : -52.994094 , DEPTH : 2587.3209 m, TEMP : 3.19843 C, SAL : 34.95907 PSU, DO : 8.09047 mg/l [15:47:58] noellehelder leaves the room [15:48:37] Probably more than a million dollar question given how many dives it would take to experimentally test! [15:48:57] johndeitz leaves the room [15:49:27] kimberlygalvez leaves the room [15:49:31] hah - true @scott! [15:49:51] True! That is good to know! There is still so much to learn about all these incredible species! [15:51:56] georgematsumoto leaves the room [15:52:35] LAT : 33.676271 , LON : -52.994098 , DEPTH : 2580.2289 m, TEMP : 3.19492 C, SAL : 34.95819 PSU, DO : 8.06653 mg/l [15:55:01] Looks like a sheet flow breakout texture just went off screen to the bottom [15:56:25] jasonchaytor leaves the room [15:57:36] LAT : 33.675926 , LON : -52.99396 , DEPTH : 2569.7274 m, TEMP : 3.19954 C, SAL : 34.95895 PSU, DO : 8.10336 mg/l [15:58:02] jasonchaytor leaves the room [15:59:17] Could be another Amphidiscella or at least a stalked euplecteillid [16:00:46] Yea, perhaps Scott. Not sure about that sponge after looking at the closeup [16:01:10] Evidently good sponge habitat... [16:01:22] Very! [16:01:33] Watch change and then we can do some zooms [16:01:52] haroldcarlson leaves the room [16:02:22] kelseyviator leaves the room [16:02:37] LAT : 33.676151 , LON : -52.993963 , DEPTH : 2562.1831 m, TEMP : 3.20032 C, SAL : 34.95917 PSU, DO : 8.09904 mg/l [16:02:55] LAT : 33.676183 , LON : -52.993945 , DEPTH : 2567 [16:03:23] Any chance of getting a sample of the manganese crust would be absolutely fantastic [16:03:37] hi Bram, we got one a little earlier [16:03:54] I think corals are more dependent on higher water flow than sponges since sponges can create their own water flow. We see sponges in very dead current places but often not so many corals. [16:03:56] the crust is growing over some beautiful pillow lava structures [16:04:09] @Chris: agreed. [16:04:13] these are classic pillows [16:04:32] we have seen some really nice transitions from sheet flows to pillows [16:04:34] I feel like I could be looking at the MAR. [16:04:53] meganmcculler leaves the room [16:05:27] noellehelder leaves the room [16:05:50] bramleymurton leaves the room [16:06:38] alright got to go, thanks for these fantastic images [16:06:41] Sponges tend to need some flow or they become clogged... [16:06:49] This one definitely looks like Amphidiscella [16:06:57] @pierre, thanks for your help [16:07:26] pierrejosso leaves the room [16:07:37] LAT : 33.67615 , LON : -52.993879 , DEPTH : 2559.7279 m, TEMP : 3.19954 C, SAL : 34.9593 PSU, DO : 8.08402 mg/l [16:08:27] Need to check to see if that genus is in the Atlantic [16:09:31] leswatling leaves the room [16:11:05] this coral looks like the D1&D2 bramble we have collected before; the base especially, but then some branches grow upright. [16:11:35] Something I've long wondered about these stalked sponges is the degree to which the stalk grows (in length) vs size of the sponge body. [16:11:37] very fine and fragile looking branches - but attached to those thicker branches that were taken over by the zooanthid [16:12:31] That is, do you get a big sponge balanced on a short stalk, which can then extend "pushing" the sponge upwards, or does the sponge body remain small until the stalk is tall enough to get into best food area, and then body increases in size. [16:12:37] big sponge? [16:12:40] LAT : 33.676013 , LON : -52.994034 , DEPTH : 2556.293 m, TEMP : 3.1967 C, SAL : 34.95855 PSU, DO : 8.08852 mg/l [16:12:43] this what can happen when you build your house on coral rubble [16:13:46] Don't know this sponge. Sorry. By the way, no point in collecting dead sponges. They lose their microscleres (tiny spicules) when they die which are crucial for taxonomic identification [16:13:56] @Les: exactly! The point I have been making over past couple of dives is that one needs a stablke substrate to get the big long-lasting colonies. So we have that substrate now - we just need beter food supply, aka currents, and recruits! [16:14:19] @Scott, totally agree [16:14:28] Scott, these stalked sponges look like Hyalostylus [16:14:31] the corals look starved to me [16:14:36] Iridescence in the jelly... [16:14:41] bramleymurton leaves the room [16:14:54] looked like Arctapodema [16:15:33] @Chris: so possibly we've had both Amphidiscella (or related) and Hyalostylus today...? [16:16:03] That would be my guess. Wish I knew more about what species are in the Atlantic. [16:16:22] bramleymurton leaves the room: Replaced by new connection [16:16:29] kelseyviator leaves the room [16:17:31] Sorry, just don't know these [16:17:39] LAT : 33.676249 , LON : -52.993881 , DEPTH : 2552.6134 m, TEMP : 3.19564 C, SAL : 34.95997 PSU, DO : 8.09884 mg/l [16:17:56] that's okay, really helpful! [16:18:17] the thickness and consolidation of the crusts indicate extreme stability of the seafloor here over millions of years - unlike much of dive 2 where we saw mainly rubble. [16:19:35] Just checked World Porifera database and all of of the listed Hyalostylus species. This sponge looks like a farreid. [16:20:23] leswatling leaves the room [16:20:26] Sorry, didn't finish the message. All of the listed Hyalostylus are in the Pacific. No examples from the Atlantic [16:21:12] meganmcculler leaves the room [16:21:12] @Chris: so worth a collection? Or are you suggesting we just don't have the right genus for ID purposes. [16:21:42] Nice diverse sponge garden on this wall. [16:21:46] I agree Rhian. It may also be a live version of the dead one you came across a few minutes ago. [16:21:59] I think I see 5 different species in a single view. [16:22:04] @Jason do you think its worth collecting a thick piece of crust like we did on dive 1? It can tell us a lot about the palaeo-oceanographic conditions [16:22:24] EX Chat Bot is now listening for chat data from this chatroom [16:22:26] I am pretty sure this is an Euretidae, subfamily chonelasmatinae, probably Chonelasma sp [16:22:31] yes, it would be good to know er: collections, we need to do a move here as we're at he end of the tether, but we could look on the next jump [16:22:40] LAT : 33.676083 , LON : -52.993832 , DEPTH : 2548.5038 m, TEMP : 3.20127 C, SAL : 34.95778 PSU, DO : 8.0896 mg/l [16:24:08] Given how many of these stalked sponges are here, it would be a good collection. Could be a new species but also its a dominant animal at this particular part of the dive [16:24:14] we have seen these sponges before but they have not been collected. Would be good to do so we know who they in fact are... the large one we called "trumpet sponge" in our paper because that is all we knew [16:24:24] if there is coarse sediment inside the sponge, then there must have been strong currents at some point to re-suspend that material [16:24:37] benthic storm? [16:26:30] EX Chat Bot leaves the room [16:26:44] noellehelder leaves the room [16:27:05] Chonelasma sp again? [16:27:09] @Bram: couldn't those particles in the sponge have come from the water column rather than resuspension? [16:27:19] How big is the biobox? ;-) [16:27:41] LAT : 33.676048 , LON : -52.993966 , DEPTH : 2541.0364 m, TEMP : 3.19709 C, SAL : 34.95925 PSU, DO : 8.11093 mg/l [16:27:57] Wizard hat sponge... [16:28:35] The older the vase is, the more curled the edges at least in my opinion. So this sponge is pretty old I think [16:29:13] @Bram: thta is, the pelagic sediments were interecepted by the sponge rather than making it to the bottom. [16:29:50] Inside brown area is dead. [16:30:03] @scott - Possibly, but there isn't much sdiment on the seafloor, despite the crusts being XX millions of years old. [16:30:04] Agree Rhian [16:30:09] say ah! [16:30:35] @Les :) [16:31:22] I think that qualifies as a wizrd hat... [16:31:37] Chonelasma species are typically characterized by very thin sheet-like walls that are almost transparent. Its because their dictyonal framework is so thin. [16:32:07] @Bram, I don't think there is much production out here; we are south of the bloom zone and more into surface waters that are subtropical and in the middle of the basin [16:32:41] LAT : 33.676209 , LON : -52.993763 , DEPTH : 2537.6558 m, TEMP : 3.19709 C, SAL : 34.95906 PSU, DO : 8.0665 mg/l [16:32:49] @les good point [16:33:13] @jason if there is a rock with crust on that would be great [16:33:33] haroldcarlson leaves the room [16:33:45] Dive 1 we got a nice piece from the edge of a ledge/sheet [16:34:17] We did get a nice sample of the crust earlier in the dive [16:35:07] For dating the magmatism and connecting NE seamounts to Corner Rise seamounts, there is strong interest in a lava sample. [16:35:30] @thomas the crusts at different depths record different water masses, so another from nearer the top would be good to compare - if possible. [16:35:45] Sorry I'm late. How's the dive going? [16:36:18] This is great video - we are seeing the primary lava flows albeit they are covered in FeMn crusts. [16:36:26] @bramley, good to know! Hopefully we can find a sample that meets both needs [16:36:31] Becasue we have a crust piece already, the next geo sampling priority is a primary rock sample, but if we fail at that, we will likely grab crust or other material that is available [16:36:57] @jason - do you have a piece of the volcanics yet? [16:37:10] echinid, possible Echinus sp [16:37:27] What is worse is that I am so delayed I no doubt said sponge when you were clearly looking at urchin! [16:37:35] Not sure, the sample we did get was weak and definitely had crust, but hard to tell if volcanics were there as well [16:37:41] LAT : 33.67623 , LON : -52.993729 , DEPTH : 2528.6543 m, TEMP : 3.22843 C, SAL : 34.95929 PSU, DO : 8.09508 mg/l [16:38:07] Wow! [16:38:12] @kevin, good afternoon/morning, very interesting dive from geology standpoint...abundat flow textures and a lot of FeMn crust [16:38:17] Holy guacamole! That's a big one! [16:38:22] Sponge sediment trap! [16:38:47] @Jason - in that case you'll need a nice angular piece, but here the crust is several cm thick and looks to cover everything.... [16:39:21] yep, the pilots are on the lookout [16:39:37] √ [16:39:54] Cool stuff, I'll be back in a few. Thanks [16:39:56] kevinkonrad leaves the room [16:40:19] jocelyncooper leaves the room [16:41:21] Good close up of the dictyonal framework [16:41:57] faecal pellets? [16:42:00] bramleymurton leaves the room [16:42:29] These frameworks, characteristic of "hard" sponges, is created by the fusion of adjacent spicules. Soft sponges don't glue their spicules together whereas hard sponges do. [16:42:33] the sponges here must be more capable of handling low food input than the octocorals [16:42:41] LAT : 33.676158 , LON : -52.99383 , DEPTH : 2523.8243 m, TEMP : 3.23839 C, SAL : 34.96093 PSU, DO : 8.03455 mg/l [16:43:09] This wizard had a very big head... [16:43:34] I am back on briefly - scanned back through the video to find really nice imagery of the halosaur Halosauropsis macrochir, called 'abyssal halosaur' but really an inhabitant of continental rise depths. Large cruising and drifting benthopelagic fish, that moves slowly over the substrate. Feeds by ingesting mouthfuls of soft sediment when it detects infaunal prey. [16:43:52]