[01:12:00] nolanbarrett leaves the room [01:46:56] robertcarney leaves the room [12:40:23] EX1803 DIVE10 Test message [12:45:01] EX1803_DIVE10 ROV powered off [12:49:28] EX1803_DIVE10 ROV powered off [12:52:31] randirotjan leaves the room [13:16:08] EX1803_DIVE10 ROV Launch [13:23:12] EX1803_DIVE10 ROV on Surface [13:23:58] EX1803_DIVE10 ROV Descending [13:29:33] pre-dive call at 830 CT [13:45:24] Good morning all. Great dive yesterday. Hope to follow it up again today. [13:48:58] ETA on bottom ~~10 CT [14:12:52] robertcarney leaves the room [14:47:50] wish you a good dive, will try to join in 4 hours [14:47:54] tinamolodtsova leaves the room [15:12:37] EX1803_DIVE10 ROV on Bottom [15:14:05] bedded sedimentary rock [15:14:11] scottfrance leaves the room [15:14:48] Holothurian [15:15:31] Mike promised me I wouldn't see any more expanses of sediment on this expedition... ;-) [15:16:36] There is rock just under that vast sediment cover [15:16:48] Cusk eel [15:17:58] Pteropod shells [15:19:00] Hello all [15:21:24] Am I the only one who has no audio on the video stream? [15:21:40] I don't have it either.... [15:21:50] Hi everyone - no audio for me either. [15:21:58] I don't have audio either [15:22:16] I thought they said something during descent about switching audio to local only. [15:22:53] I was just trying to check my audio and sound device on my computer but found anything [15:23:45] Hello everyone! There is a live interaction going on right now. That is why you are not hearing anything at the moment [15:24:18] Okay - thanks. Very odd to have a completely silent video playing. [15:24:36] sponge [15:24:54] larvacean [15:29:12] Slime star [15:31:02] emilycrum leaves the room [15:35:03] adamskarke leaves the room [15:35:53] ahh, thanks for clearing up the audio. I went to the public page to with similar lack of success. Looks interesting on camera 2 feed! [15:38:42] thomasritter leaves the room [15:38:53] Carbonate rock rubble [15:39:33] adamskarke leaves the room [15:39:50] Sometimes a full meal does not slow one down! [15:41:41] This is the first time I've seen a seastar skipping across the sediment! [15:41:51] Must be being lifted by ROV wash... [15:42:21] For newly joining folks in chatroom: lack of audio is due to live interaction on the ship. [15:48:45] day for moving stara not suckered tubefeet [15:49:00] note [15:49:32] heatherjudkins leaves the room [15:56:23] Is anyone else hearing an intermittent beeping? [15:59:09] Yes, I hear it on the phone call. [15:59:46] I think it may be associated with VOIP call... [16:00:46] It is also coming over the live stream [16:20:24] FYI, the chirp on the phone has been gone for some time now. [16:21:33] robertcarney leaves the room [16:22:30] Umbellula [16:23:35] May I suggest a collection of Umbellula, which we image frequently but never collect. The genus Umbellula has been shown to be polyphyletic. That means what we call "Umbellula" is actually multiple genera. [16:24:28] I don't know that we know how to distinguish them from in situ images. [16:24:38] got it scott [16:25:10] we are on the move, but hopefully see it again [16:25:37] That was poor English! I don't know that we know how to distinguish different Umbellula in in situ images. [16:26:17] if we collect the rock, we could probably turn around and get the Umbellula [16:27:34] Copy that Daniel. [16:28:37] @Dan: I suspect you've already looked, but I see in Cairns & Bayer that the depest recorded Umbellula in GoMex is U. lindahlii from 2866 m. So if this were the same species, it would be a deeper collection. [16:28:48] emmahickerson leaves the room [16:29:18] Yup, I am looking at that same record right now [16:30:48] @Dan: when I refer to the polyphyletic Umbellula, I am referencing the Dolan 2013 paper in MPE. [16:32:02] "Rock" is a loose term for that! [16:33:03] If you do try to collect that Umbellula, try pulling it from the bottom, not cutting it along the stalk. [16:33:31] A "rock" well on its way to mud [16:33:54] And not mud partly on its way to rock...? [16:34:15] That is, are you certain it is worn carbonate? [16:34:28] [questions from a non-geologist] [16:34:41] [but someone who is facinated by rocks] [16:37:20] BTW, I wouldn't spend much time trying to reacquire the Umbellula. If you see another one, we can consider collecting it then. [16:40:57] fernando leaves the room [16:44:03] It is entirely possible that the peduncle deflated once it was picked up. [16:44:34] I suspect that when you look at it on deck you will see it is entire at the base, i.e. not broken. [16:44:42] Well done Bobby! [16:46:18] adamskarke leaves the room [16:47:11] FYI, for interest, the genus Umbellula has been collected from >6000 m. [16:47:30] Deepest of the known sea pens [16:48:43] emmahickerson leaves the room [16:52:39] Nice echiuran feeding trace to right front of anemone [16:52:45] Excoelactinidae [16:54:38] Looks like dead bamboo coral [16:57:53] meganmcculler leaves the room [16:59:14] laurenjackson leaves the room [17:00:44] michaelvecchione leaves the room [17:02:24] danielwagner leaves the room [17:02:39] @scott - Answering your earlier question on the rock: To reach this location the rock had to have rolled downslope. To survive that trip, it must have previously been much more "solid" than it is now, so I suspect it has degraded substantially since that point. [17:04:01] But more to your point, all of the seafloor sediments are on there way to belong rock at some point in the future assuming they continue to be buried [17:04:12] *their [17:04:29] *becoming [17:05:42] isopod [17:09:37] iscwatch leaves the room [17:10:34] Hormethiidae [17:13:57] I, for one, am glad to hear we are seeing more in situ than in the museum! I'd prefer we keep more alive than pickled! (yes, I know that is not what Chris meant) [17:14:47] Deimatidae [17:18:07] Galacantha [17:19:47] cool outcrops [17:21:18] meganmcculler leaves the room [17:24:58] Sorry I missed it on the audio, which taxon was that coral? [17:26:25] Keratoisis [17:27:13] @Dan: wrote name in SeaScribe [17:28:27] thanks scott [17:28:49] Regarding the ipnopid Ipnops my best guess is that the cream-yellow retina (with a low density of receptor cells) may be a filter selective for blue light, the dominant type of bioluminescence produced in the deep ocean. There may be an advantage in spreading the retina flat, achieving as large a receptor/filter surface as possible. There is an optic nerve, albeit thin. Almost all ipnopid fishes are microvores specializing on boundary layer crustacea and other plankton of small size. Tripodfishes use specialized pectoral fin rays, spread like a dish antenna, to detect movements. Those pectoral rays are innervated with very robust nerves and extravertebral ganglia. The eyes in tripodfishes are minute, but functional. Ditto in Bathytyphlops, Bathymicrops, and Discoverichthys. Ipnops is the oddball with those flattened enlarged eyes lying under transparent cranial bones, eyes without a lens. All ipnopid genera sit upon prop-like pelvic fins to elevate the body - and mouth - into [17:28:58] the near-bottom water column, up away from the high-friction, low-velocity zone at the substrate. This promotes opportunities to intercept current-borne plankton, however sensed. Bathypterois grallator, with prop fins up to 1 m in length and large body size can feed upon larger prey, with some evidence of capturing sizable gelatinous zooplankton and midwater fishes. A ceratioid angler was found in the stomach of one specimen. B. grallator likes to perch atop sediment ridges, facing into the accelerated current sweeping up and over the ridge crest. Good feeding station. When the mouth is opened, it is capacious with gill arch elements forming a strainer basket. [17:29:24] kensulak leaves the room [17:30:14] thanks ken [17:31:54] Great info Ken! [17:34:19] I have to step out for a while. Continued good exploring! [17:36:15] carolynruppel leaves the room [17:37:41] iscwatch leaves the room [17:38:39] thomasritter leaves the room [17:41:22] adamskarke leaves the room [17:41:47] amandademopoulos leaves the room [17:48:29] carolynruppel leaves the room [17:52:59] adamskarke leaves the room [17:56:10] randirotjan leaves the room [17:58:03] scottfrance leaves the room [18:00:38] stevenauscavitch leaves the room [18:00:43] meganmcculler leaves the room [18:01:43] Bryozoan mats [18:04:24] adamskarke leaves the room [18:06:13] A beautiful sight to see on my return! [18:08:19] zachproux leaves the room [18:13:19] Losing video :( [18:13:32] Nope it's back. [18:14:30] Looked like Actinauge sp. [18:16:08] Adam: I don't think the CCD is an absolute for animals that secrete skeletons with CaCO3. I suspect they expend energy to deposit such skeletons in the face of the dissolution environment. At least, that is my impression based on distribution. For example, there are many bamboo corals below CCD around Aleutians, and they have lots of carbonate in the skeleton. [18:16:50] Possibly part of the difference is the degree to which the skeleton is "protected" by the epithelial tissue, e.g. it is not in direct contact with the water. [18:17:33] Once they die, then I guess the hard parts would dissolve. [18:17:40] charlesmessing leaves the room [18:31:11] enriquesalgado leaves the room [18:34:48] Like the last colony, this one has a single mysid swimming alongside it. [18:39:13] amybowman leaves the room [18:47:49] Deimatidae [18:52:20] Dave PAwson recently described a holothurian that armors itself with pteropod shell. BTW the shells are all from the genus Clio. [18:56:56] Pteropod and/or foram covered deep holothuroid common and previous assigned to Pseudostichopus [18:57:05] kristopherbenson leaves the room [19:09:19] Hi Adam or Daniel. We are doing a test for our interaction on Monday. Can you help by giving a Hello to Garrison Elementary? [19:11:19] Thanks Dan [19:14:06] Test is done. We'll have the live interaction Monday at 1:15 pm central time. [19:14:20] Of course I will let you know then. [19:14:45] roger that scott. we will be ready to give a shout out then as well [19:15:25] The teahcers were excited, so I'm sure the students will be! [19:15:38] Yikes. *teachers [19:16:28] adamskarke leaves the room [19:21:13] heatherjudkins leaves the room [19:21:46] hi here. any samp-ling done? [19:22:21] hi tina, one Umbellua sp. sample from ~~2900 m [19:23:36] heatherjudkins leaves the room [19:23:54] can we try to collect Relicanthus? [19:24:07] in fact [19:24:19] it is a tubeam\nemone [19:24:29] i think it will be too fragile [19:24:37] ? [19:24:50] I believe we saw the same species in a similar ravine during EX1711 in December. [19:25:26] scottfrance leaves the room [19:26:52] jillbourque leaves the room [19:30:21] Laptop crash! [19:31:26] nornal anemone [19:31:34] Another 200 m up (I mean in depth) and we're going to start to see the really good stuff! ;-) [19:33:04] @scott, you think because of dead things? [19:33:56] what is that substance covering?? [19:34:21] robertcarney leaves the room [19:34:38] @Tina: no, only because we often see around 2500 m in the Atlantic is where octocoral diversity and abundance picks up. [19:35:00] Sponge is my guess for overgrowth [19:35:15] slimy sponge? [19:35:28] Cousin of the slime star? [19:35:47] ... very distant... [19:35:56] cousin I mean [19:36:15] may be just a convergence.... [19:36:42] did we collect Acanella without roots yesterday? [19:37:13] ... even cucumber was slimy [19:37:34] slimy biotope with slimy animals [19:38:35] @Tina: no, I don't think we collected the Acanella. [19:38:45] no tina we did not collect it yesterday [19:38:52] This is at least superficially similar to some topography and substrates observed during EX1711. [19:39:53] emmahickerson leaves the room [19:40:54] polychaete tube, perhaps Sabellidae [19:41:30] yup. [19:41:51] no associates. [19:43:57] Is anyone familiar with the consensus about larval dispersal and recruitment of any of these extremely widely separated individuals (or colonies) of sponges and octocorals (etc.) at these depths? Or is there any consensus? [19:44:15] @Tina: another point about the 2500 m mark is that it is getting close to the top of the ridge-like feature we are climbing, and currents may be slightly higher there. [19:44:36] hahaha. Consensus. [19:44:52] @Chuck: No. Insufficient data so far on the deep ones. [19:45:24] @scott, following chuck's question... if Chrysogorgidae have males and females? [19:45:31] For the most part, I don't think we even know which ones are broadcast spwaners, which ones are brooders, what their larvae look like, etc. [19:45:45] @Tina: let me check to see what Anne Simpson found... [19:46:17] shrimp... [19:46:39] cerataspis [19:48:01] Understood. Even in far shallower water (400-500 m) in the Bahamas, I observed meadows of stalked crinoids at intervals for 8 years in the 1990s but never saw any juveniles. [19:49:27] @charles.. hypothes is that... there are some kind of recruitment years.... [19:49:39] Maybe they need to be lucky and recruit during a decade when roving hoardes of ravenous seastars are not about. [19:50:05] holothurian [19:51:03] another holothurian [19:52:04] Benthothuria funebris - lumpy purple holo. [19:54:08] @Tina: from Anne's text in our Deep-Sea Octocorals review: "In most octocorals, including all known deep-sea species, gonochorism occurs at the colony level. In a comprehensive review of reproduction, Kahng et al. (submitted) report 89% of octocoral species are gonochoristic and 9% are simultaneous hermaphrodites. Hermaphroditism appears to occur mostly in a limited number of shallow-water, soft coral species, especially in the families Alcyoniidae and Xeniidae. The only account to date of hermaphroditism in a deep-water octocoral is for a yetundescribed Drifa sp. (Alcyoniidae) from the North Atlantic" [19:54:40] That said, not many deep-sea species have actually been studied to my knowledge. [19:55:14] scottfrance leaves the room [19:55:17] good... Drifa [20:08:55] tubanemone [20:09:00] adamskarke leaves the room [20:10:23] perhaps 60 benthic species in 8 genera [20:11:27] фтв фищге 120 ызусшуы ифыув щт здфтсещтшс дфкмфу [20:11:33] sorry [20:11:51] about 20 spp of planktonic larvae [20:12:03] 120 [20:12:18] in ~~20 genera [20:13:00] erineaston leaves the room [20:13:01] Isopod [20:13:29] you have face here [20:15:52] tubeanemony may be Pachycerianthus... but not even 90% [20:16:12] thanks tina [20:17:50] michaelvecchione leaves the room [20:18:59] genus is not really reported from GoM. but a fragment I was sent few years ago is genetically align to this genus.. [20:19:21] looks like polychaete [20:19:35] may be polynoid [20:19:44] Or maybe on the back side of the sponge...? [20:25:06] another holothurian. nop many fish today [20:26:30] The more crumbly the rock, the less likely we see nice big sessile fauna growing on them. The bottom collapses out from under them. [20:27:32] No corals, no zooplankton hovering around corals, nothing for fish to feed on... An idle hypothesis as we transit this area. [20:28:34] @scott, you remember other day comb-jelly realm without any corals? corals are not necessary... to have fish around [20:29:55] @Tina: yup. I was just trying to shame the corals into making an appearance. [20:31:25] @scott, try harder) [20:32:13] perhaps we are just at wrong side [20:32:46] polychaete sabellidae [20:33:30] And a few tiny snails or hermits on that first tube. [20:34:30] they do not like this substrate... polychaete tube seems more attractive to all these animals [20:35:19] amybowman leaves the room [20:36:32] bivalve siphon? [20:36:49] Sponge? [20:37:11] fleshy. [20:37:20] can we poke it?) [20:37:32] Agreed, looks fleshy, but is too rigid for a siphon I think. [20:37:41] Plus it isn't open. [20:37:52] if it escape it is bivalve, if not it has to be sponge? [20:38:10] @scott, it had opening [20:38:23] I didn't see it. [20:38:51] Weird that we haven't seen more Umbellula today. [20:39:02] After the first one, I mean. [20:39:16] good thing we sampled [20:39:29] Agreed. [20:40:47] @adam, may be it was only one... stray umbellula without relatives [20:41:34] chiton! [20:41:38] andreaquattrini leaves the room [20:43:07] they look like family [20:43:15] @Tina: Re: that last thing we were imaging that we couldn't ID (sponge or siphon). I was thinking a young version of something like this: https://www.ncddc.noaa.gov/okeanos-animal-guide/Tetractinellida001.html [20:43:26] zoanthids [20:44:17] These look more like anemones than zoanthids to me. [20:44:32] Even though I know this is the place we usually see zoanthids. [20:44:43] They don't look connected... [20:45:00] And the column epithelium looks very thin. [20:45:27] Perhaps the connection is within the strands of silica rays and can't be seen. [20:45:37] more anemones for me.. [20:45:51] Sounds like all 3 of us agree those are anemones. [20:46:04] yup [20:47:52] paullarson leaves the room [20:48:44] Sargassum [20:49:04] how was situation with Sargassum at the surface this year? [20:52:23] we have been at MAR ~~ 13N this year, it was a lot of Sargassum at the seafloor. as well as at the surface [20:57:26] ipnops [20:58:24] kensulak leaves the room [21:02:24] crinoid passed [21:02:32] right [21:03:01] star [21:03:12] adamskarke leaves the room [21:03:50] starving goniasterid? [21:07:36] collection? [21:07:49] scottfrance leaves the room [21:07:54] robertcarney leaves the room [21:08:32] We haven't seen so much today that there is any guarantee of abundant collecting opportunities upslope [21:08:42] Fine by me [21:08:48] agreed [21:08:56] roger that [21:09:23] can someone type the name of the sea star ? or do you want me to use goniasterid ? [21:09:36] Naturally the chatroom logged me out as you asked for input. [21:09:50] Sibogaster [21:09:54] Looks small compared to the claw... [21:11:24] heatherjudkins leaves the room [21:11:47] Holding my breath here... [21:12:30] Never underestimate the talents of the ROV pilots! Bravo. [21:12:35] in the box [21:12:55] Fantastic collection [21:15:00] Umbellula again [21:15:13] umbellula [21:15:28] same? [21:15:42] Adam is right - I do have the power to conjure fauna! [21:16:03] Indeed! [21:16:42] no sclerites [21:17:00] heatherjudkins leaves the room [21:19:52] they are bioluminescent. Umbellula I mean [21:20:00] scottfrance leaves the room [21:20:12] adamskarke leaves the room [21:20:50] Gorgeous! [21:21:16] can we zoom more at siphonozoids?? [21:23:17] My cursed laptop keeps freezing on the screen saver, requiring rebooting... [21:23:31] sometime they have reduced tentacles [21:24:46] lonely in seasnow [21:25:26] @Tina That should be the title of a poem [21:26:15] @nolan, sometimes I have inspiration for titles.. ok, you can write a poem) [21:27:17] briankennedy leaves the room [21:27:30] When I finish one, I'll send it to you to see what you think!:) [21:27:35] stevenauscavitch leaves the room [21:28:57] it was not such seasnowstorm few minutes ago... [21:30:12] elizabethurbangedamke leaves the room [21:30:32] I live alone in the seasnow / the darkness all around / Until one day my day is brightened / And my polyps whirl around / What is this magnificent creature suspended above me? / A fellow deep-sea denizen? / Alas, a giant robot / Now moving away from me. [21:30:59] ))))))))))))))))))))))))))))))) [21:31:17] you have to read it aloud, scott))) [21:32:18] @Tina Yes! [21:33:08] Sea pens don't talk. [21:33:31] They keep their melancholy to themselves. [21:33:45] And thechat room. [21:33:55] @scott, you think they does write??? [21:33:59] But you already anthropomorphized them with them wearing lipstick [21:34:25] lol [21:34:30] Poor poor Umbellula. I'll be its friend [21:34:46] Now everone is bummed about Umbellula. [21:35:49] another Umbellula [21:36:09] Hurray! Its not lonely afterall! [21:36:18] Fewer polyps on this one. [21:36:53] @nolan, just ~~100 m away [21:37:59] If only they could just get up and walk to each other... [21:38:18] it looks different. but it is a headache to split these Umbellulas without sclerites.. [21:38:38] robertcarney leaves the room [21:38:44] @nolan.. they are not attached. they can crawl [21:39:03] For all we know, one has left the other in a huff. [21:39:25] See what happens in the chatroom on extended dives... [21:39:34] crawl in the dark through the seasnow... [21:39:56] @Scott:-D [21:40:25] @Tina Is the peduncle inflatable like the more iconic deep-sea pens? [21:40:58] @nolan, just a normal peduncle [21:41:38] @Tina Thank you! [21:42:16] @nolan, not like iconic peduncle of Pennatula inflata [21:42:29] ophiuroid [21:43:37] pteropod shell [21:43:55] Nicely swollen disk. [21:44:05] @Tina Would the peduncle of Umbellula grow narrow and deep or wide and shallow? [21:44:18] Clio included [21:45:59] @nolan, in Umbellula it is a bit expanded ... [21:48:11] @Tina Interesting. I was just wondering what morphology would be best for this type of sediment [21:48:19] Bathytyphlops? [21:48:36] do it from side [21:49:51] very strange fins [21:50:54] I think it is Bathytyphlops @Dan [21:52:03] iscwatch2 leaves the room: Replaced by new connection [21:52:14] I added a follow up tag to the observation [21:55:06] sponge is good [21:56:09] @Adam Carbonate rock? [21:57:09] @lauren- yes [21:57:18] andrewshuler leaves the room [21:58:07] put in geo [21:58:59] I missed the pick up. Did the sponge and anemone accompany the rock? [22:00:00] yup [22:00:32] Cool. What a serendipitous find at the end of the dive. [22:02:55] I hope the bios survive the trip back to and up on to the ship [22:03:21] Sooner is better than later for call. [22:03:40] thanks to pilots.... and to scott for the poem [22:03:48] Are we doing the call as rov's go up? [22:03:59] :-) [22:04:03] @Tina agreed [22:04:11] @Heather: yes. [22:04:13] In about 15 minutes, or sooner. [22:04:23] See everyone tomorrow! Thanks for a wonderful dive! [22:04:26] nolanbarrett leaves the room [22:04:43] tinamolodtsova leaves the room [22:04:45] CAll at 520 CT [22:04:56] sounds good [22:05:30] Thank you. [22:05:42] EX1803_DIVE10 ROV Ascending [22:06:13] charlesmessing leaves the room [22:10:08] GeorgeMatsumoto leaves the room [22:13:46] adamskarke leaves the room [22:13:53] heatherjudkins leaves the room [22:20:43] heatherjudkins leaves the room [22:24:17] Lampocteis? [22:24:33] one of the undescribed species I think [22:25:58] scottfrance leaves the room [22:26:55] iscwatch leaves the room [22:30:28] amybowman leaves the room [22:31:21] adamskarke leaves the room [22:34:06] laurenjackson leaves the room [23:02:47] Apolemia? [23:11:03] Solmissus [23:13:35] joshuacarlson leaves the room [23:17:21] adamskarke leaves the room [23:20:47] physonect. Apolemia? [23:23:21] asakomatsumoto leaves the room [23:24:55] Euplokamid cydippid ctenophore "round square" [23:32:22] too much wash. must be end of observations now. Thx for dive [23:32:29] dhugallindsay leaves the room [23:43:10] EX1803_DIVE10 ROV on Surface [23:56:44] EX1803_DIVE10 ROV Recovery Complete