#marine biogeochemistry

[roundearthsociety]

Also it's funny how the closest thing to a religion tag I have is "biogeochemistry". Didn't set out to be that but it's about the "you are dust and to dust you will return" of it I guess

[watcherscrown]

“I basically told my students, just put the sensors back in the box. We’ll ship them back to the manufacturer and get them tested because they’re just giving us gibberish,” said Sweetman, a professor at the Scottish Association for Marine Science and lead of the institution’s seafloor ecology and biogeochemistry group. “And every single time the manufacturer came back: ‘They’re working. They’re calibrated.’"

COOL

[starlite-writes]

can you tell us more about dr silk and dr tussah?

Sure! Putting it under the cut since it got a little long.

Dr Adaliah Silk (formerly Elysia Soros) is the head of the Aether Research Institute and the public face of IGORA as a whole, as I've said before. She has two doctorate degrees (astrophysics and computer science) and a master's in aerospace engineering! All in all, she's a very pragmatic and intelligent woman who is often seen as friendly and helpful despite actually being the epitome of corporate coldness. She's also quite curious about the possibility of alternate realities!

She has a couple of AIs she's programmed for various reasons! Their names are Azalea (her admin), Tocelyn (her personal assistant/pet fox), Maximilian (speech/language pathologist). She also has Del (space exploration), Tey (repair), and Sar (repair), who all belong to @packedlunchmeat!

All of her children hate her, with the exception of Azalea and Tocelyn. She's a bad mother (not a maternal bone in her body). Most of her kids have been kidnapped at least once.

Silk is one of those people who really likes to bully the people under her but in the way of like. she pretends she's just playing or it's an inside joke. For example, on April Fool's Day, she pays her interns in Monopoly money. Objectively not funny to the person missing out on a day's worth of pay, but hilarious to her.

Silk has three siblings! They're named Lysander (who works as IGORA's lawyer), Valeria (a history teacher), and, of course, Dr Tussah.

And Dr Caspian Tussah (formerly Aurelius Soros) is the head of the Nautilus Research Institute! He's more seen than heard, because he's not as good at the whole. politics thing. He's really just here to study fish! He has two doctorates (marine biogeochemistry and computer science) and a master's in oceanography.

Tussah is typically thought of as the hardass out of the two, but he's actually not. He's not soft, but he's definitely nicer (potentially attributed to his better work-life balance lol). The bar was on the floor, though. He has a pretty decent relationship with most of his employees but he's also prone to outbursts of violence (namely hitting people across the shins with his cane).

He's got a few AIs of his own! They are August and Tenebris, and they're both medical AIs. August is the sole surviving AI from the Coelacanth disaster (and that's a whole story on its own, honestly). He probably has more by this point but I can't remember them right now 😭

Tussah also did the physical designs for all of Silk's programs! He's an artist. Silk doesn't care about aesthetics but her brother very much does. If not for Tussah, all of Silk's AIs would be just. blobs or stick figures. The only one she designed was Tocelyn, by way of origami.

Silk's birthday is May 30th, and she's 38 years old! Tussah's is July 3rd and he's 36! They don't tell people they're siblings and keep it a secret, so there are a lot of bets around the office about if they're siblings, lovers, or old friends.

If you've made it this far, thanks! You might be interested to know that they both have... complicated relationships with two Very Notorious red and blue coded viruses. :)

If you think you know who they are... you're probably right!

[news-wtf]

“I basically told my students, just put the sensors back in the box. We’ll ship them back to the manufacturer and get them tested because they’re just giving us gibberish,” said Sweetman, a professor at the Scottish Association for Marine Science and lead of the institution’s seafloor ecology and biogeochemistry group. “And every single time the manufacturer came back: ‘They’re working. They’re calibrated.’”

Photosynthetic organisms such as plants, plankton and algae use sunlight to produce oxygen that cycles into the ocean depths, but previous studies conducted in the deep sea have shown that oxygen is only consumed, not produced, by the organisms that live there, Sweetman said.

Now, his team’s research is challenging this long-held assumption, finding oxygen produced without photosynthesis.

“You’re cautious when you see something that goes against what should be happening,” he said.

The study, published Monday in the journal Nature Geoscience, demonstrates how much is still unknown about the ocean depths and underscores what’s at stake in the push to exploit the ocean floor for rare metals and minerals. Its finding that there’s another source of oxygen on the planet other than photosynthesis also has far-reaching implications that could help unravel the origins of life.

fuuuuuuuuuuuuuuuuuuuck

[botanyone]

Algae Perform Photosynthetic Manoeuvres In The Dark

Algae Perform Photosynthetic Manoeuvres In The Dark https://ift.tt/JnYeDUG Hoppe and colleagues discovered that Arctic microalgae can photosynthesize and grow in incredibly dim light, challenging our understanding of ocean productivity. Their findings suggest that marine life in polar regions and deep waters may be more active than we realized. The researchers found algal growth resumed under sea ice at daily average light levels of just 0.04 μmol photons m⁻² s⁻¹ in late March. This is 10-100 times lower than previous estimates and approaches the theoretical minimum light requirement for photosynthesis. As part of the expedition, they froze the German research icebreaker Polarstern in the icepack of the central Arctic for a year in 2019, in order to investigate the annual cycle of the Arctic climate and ecosystem. The team used autonomous light sensors deployed under Arctic sea ice during the year-long expedition. They also tracked algal growth by measuring chlorophyll concentrations and carbon uptake in water samples, The extremely low light levels supporting net growth were unexpected and suggest marine primary production may occur more extensively than previously thought. The photosynthetic habitat in the global ocean could therefore be significantly larger than previously assumed. [O]ur threshold would deepen the bottom of the euphotic zone from 23 to 54 m. This substantially increases the vertical extent and thus the total volume of the euphotic zone in the world’s oceans and may change our view on upper twilight zone ecology and biogeochemistry. Hoppe, C. J. M., Fuchs, N., Notz, D., Anderson, P., Assmy, P., Berge, J., … & Wloka, J. (2024). Photosynthetic light requirement near the theoretical minimum detected in Arctic microalgae. Nature Communications, 15(1), 7385. https://doi.org/10.1038/s41467-024-51636-8 Cross-posted to Bluesky, Mastodon & Threads. Cover image: MOSAiC Ocean City during Leg 3. Alfred-Wegener-Institut / Saga Svavarsdottir The post Algae Perform Photosynthetic Manoeuvres In The Dark appeared first on Botany One. via Botany One https://botany.one/ September 06, 2024 at 04:30AM

[jobtendr]

(17) PhD, Postdoc and Academic Jobs at Radboud University in the Netherlands

Radboud University invites application for vacant (17) PhD, Postdoc and Academic Jobs   Radboud University invites application for vacant PhD, Postdoc and Academic Positions, a public university with a strong focus on research located in Nijmegen, the Netherlands. Postdoctoral Researchers: Environmental Science, Hydrology, Socioeconomics, Toxicology or Ecology of Pollutants  Job opportunity 0.8 – 1.0 FTE Gross monthly salary: € 3,226 – € 5,090 Faculty of Science Are you eager to learn how emission, fate and effects of pollutants (and the water, material and biomass flows that carry them) are related to the size of cities, catchments, organisms and communities? Then join the ERC Advanced Grant project ’The… PhD Candidates: Environmental Science, Hydrology, Socioeconomics, Toxicology or Ecology of Pollutants  Job opportunity 0.8 – 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Science Are you eager to learn how emission, fate, and effects of pollutants (and the water, material and biomass flows that carry them) are related to the size of cities, catchments, organisms, and communities? Then join the ERC Advanced Grant project “The… PhD Candidate: The Conceptual History of Ethics in Modern Arabic  Job opportunity 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Philosophy, Theology and Religious Studies Are you fascinated by the history of ideas in the Arab world? By how the Arabic language developed in the modern age? By its discourse on ethics and how it has affected society? In this funded PhD position, you will research the modern history of the… PhD Candidate: Biogeochemistry  Job opportunity 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Science Would you like to contribute to understanding the impact of climate change on nutrient dynamics in high-latitude marine environments? Do you thrive in the dynamic blend of fieldwork adventures, laboratory experiments and geochemical modelling? As a… Postdoctoral Researcher: Growing Cancer Organoids in Synthetic Matrices  Job opportunity 1.0 FTE Gross monthly salary: € 3,226 – € 5,090 Faculty of Science Progress in cancer biology is hampered by the difficulty to grow them in a realistic environment. The best models currently available are 3D tumour organoids. 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Then join the Software Science group at the Institute for Computing and Information Sciences as a PhD… PhD Candidate in Condensed Matter Physics for the Synthesis of 2D Materials  Job opportunity 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Science The goal of this PhD project is to develop, build and operate a vacuum compatible exfoliation center for the creation of heterostructures constructed from reactive 2D materials. PhD candidate Metaphysics and Philosophical Anthropology  Job opportunity 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Philosophy, Theology and Religious Studies Are you a creative and independant thinker who is passioned about German Philosophy? Are you interested in anthropological theories of the late 18th and early 19th centuries? And do you hold a Master’s degree in Philosophy, or are you close to…     Assistant/Associate Professor of Chemistry Education  Job opportunity 0.8 – 1.0 FTE Gross monthly salary: € 4,332 – € 8,025 Faculty of Science Are you an enthusiastic scientist in the field of chemistry education with a drive to work at the cutting edge of the field? Would you like to help us translate fundamental insights into engaging activities in teacher education? And are you willing… PhD Candidate: Philosophy of Science: Causal Inquiry in the Social Sciences  Job opportunity 0.8 – 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Philosophy, Theology and Religious Studies Are you a creative and independent thinker and passionate about analytic philosophy of science? Are you interested in exploring how social scientists uncover causes and effects in the social world? 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PhD Candidate: Computational Cognitive Neuroscience – Decision Confidence  Job opportunity 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Science We conduct weekly interim selections; therefore, we advise you to apply in a timely manner. The vacancy will close on August 1st or earlier if we find a suitable candidate before then. PhD Candidate: Apocalypticism in Contemporary Indigenous Literatures: Ways of Knowing the End of Times  Job opportunity 0.8 – 1.0 FTE Gross monthly salary: € 2,770 – € 3,539 Faculty of Arts Today’s complex global questions require new scientific talents, whose fresh insights can shift the frontiers of research. As a PhD Candidate at Radboud University, you can become an expert in apocalypticism in contemporary Indigenous literatures. We… Read the full article

[evoldir]

Fwd: Postdoc: BrynMawrC_Philadelphia.GeneticDiversity

Begin forwarded message: > From: evoldir@evol.biology.mcmaster.ca > Subject: Postdoc: BrynMawrC_Philadelphia.GeneticDiversity > Date: 9 February 2024 at 05:56:56 GMT > To: rdmpage@gmail.com > > > > Eco-Evo Postdoctoral Position at Bryn Mawr College > > The Mozdzer Lab in the Department of Biology at Bryn Mawr College is > searching for a postdoctoral scholar. The postdoctoral scientist will > work on a collaborative “Bridging Ecology and Evolution” National > Science Foundation (NSF) project with colleagues at the Smithsonian > Environmental Research Center and the University of Tennessee at > Knoxville. Our collaborative project aims to link genetic diversity and > genomic variation to measures of carbon cycling. The collaborative project > will leverage an ongoing global change experiment at the Smithsonian > Global Change Research Wetland and a de novo quantitative genetic study > of trait variation at Bryn Mawr College. > > The Mozdzer Lab seeks a postdoctoral scholar with expertise > in biogeochemistry, functional plant ecology, and/or computational > modeling to complement our research program. The postdoctoral scholar > will work as part of a team to measure biogeochemical processes and will > design experiments allowing our group to bridge the fields of ecosystem > ecology with evolutionary ecology. The team will include undergraduate > students and a full-time research assistant in both the field and in the > laboratory.  The position requires week-long travel to our field sites, > monthly from May to November with the successful candidate conducting > fieldwork campaigns in Maryland. > > Term: > The initial appointment for this grant funded position is for one year > and may be renewed for one additional year. > > Minimum Qualifications: > > - Completed Ph.D. > > - Expertise in biogeochemistry, functional plant ecology, and/or >  computational modeling > > - Must be authorized to work in the U.S. > > - Must possess a valid U.S. driver’s license with a clean >  driving record. > > - Must be able to travel for business. > > Preferred Qualifications: > > - Expertise in Ecology, Evolutionary Biology, or relevant field. > > - Experience in measuring greenhouse gas fluxes, biogeochemical >  processes, plant functional traits and/or willingness to learn. > > - Experience in evolutionary processes, ecosystem modelling, and/or >  willingness to learn. > > - Data management and analysis in R, SAS, or other programming language. > > - Research background with strong writing ability. > > Physical Requirements: > > Must be capable of rigorous outdoor activity (lifting approx. 50 pounds, > bending or kneeling for long periods of time, carrying heavy equipment, > moving large potted plants, and the capability to walk through waist-high > marine waters, tidal wetland habitat, and/or forests on narrow boardwalks > to access field sites). > > Application Process: > > Interested candidates should submit via Interfolio, > https://ift.tt/OSDP8sU 1) a cover letter identifying > availability for the position and addressing all the required and > preferred qualifications, 2) a full curriculum vitae, and 3) three letters > of recommendation. The review of applications will begin immediately > and continue until the position is filled. > > About the Institution > > Bryn Mawr College is a private liberal arts institution located in the > Philadelphia, Pennsylvania region. The College serves a population of > approximately 1,700 students at both the undergraduate and graduate > levels. It has a long tradition of educational excellence and offers a > dynamic and challenging work environment. The campus is easily reached > by public transportation as well as most major highways. Bryn Mawr > College is an equal opportunity employer that believes that diversity > strengthens our community; candidates from underrepresented groups are > especially encouraged to apply > > Thomas Mozdzer

[eddieintheocean]

In addition to your response about unis making marine ecology/bio students take physics and chemistry - almost all will do that. As you said, it's to make sure everyone is at the same level, but it's also because it WILL come up in the weirdest ways in later years in the ecology modules (I have to learn about thermodymanics, for example)

yeah i've already had this happen a little bit

i have a module about biogeochemistry, and on the first lecture we did stuff about hydrothermal vents and that came up like a couple weeks later in a completely different module which was fun

i can already see alot of what i've done coming up again but if i see any physics i will scream

[oupacademic]

Episode Two of Blue Planet II takes us to the deepest, darkest depths of the ocean floor, where crushing pressure, brutal cold, and pitch-black darkness make this one of the most extreme environments on our planet. Leading up to the episode this week, we’ll discover alien worlds, volatile landscapes, and a host of bizarre creatures that call this almost-inhospitable environment their home:

The first systematic deep sea exploration took place between 1872 and 1876, and was conducted by the Challenger Expedition on board the ship H.M.S. Challenger, led by Charles Wyville Thomson. The expedition led to the discovery of two new forms of deep-sea Ascidians (sac-like marine invertebrate filter feeders).

Benthic deep-sea environments are the largest ecosystem on Earth, covering approximately 65% of the planet’s surface and account for <95% of the volume of the biosphere. Increasing evidence suggests that global climate changes affect even this most remote of ecosystems.

Deep-ocean animals have adapted to the lack of light and scarcity of food in a number of ways. These include: greatly overdeveloped eyes, huge mouths, and being often equipped with numerous long, sharp, inward-pointing teeth.

Day-to-day you may not notice our bioluminescent aquatic friends, but in reality glow-in-the-dark critters comprise 5–59% of the abundance and 10–15% of the biomass in the world's oceans.

In addition to being home to a vast number of deep-sea critters, the Mid Ocean Ridge is also rich in minerals such as copper, zinc, and gold due to high amounts of volcanic activity.

The nature of a deep sea vent is dependent on the nature of the rock beneath. Most vents are Basalt-hosted, rich in sulphides and silica. However, ‘Rainbow’ in the Mid Atlantic Ridge is one of only two hydrothermal vents situated on ultramafic rock, causing more acidic fluid, rich in metals such as iron and manganese, and high in methane. Yet one species of shrimp has managed to adapt to call this harsh environment home.

In 2015, two new species of deep-sea starfish (Forcipulatacea) were discovered, including the first known sea star from hydrothermal vent habitats. This led to a new family and genus of starfish within the class Asteroidea.

Rubyspira osteovora is an unusual deep-sea snail from California, and has only been found on decomposing whales, thought to use bone as a novel source of nutrition.

While they may be one of the ocean’s most voracious predators, even the Humboldt Squid is feeling the impact of climate change. Squid habitats are becoming displaced as they respond to varying levels of ocean warming, and are having to find even deeper water to call home to avoid hypoxic waters and thermal stress in shallower waters.

Squid are the favoured food of sperm whales, and titanic struggles have been witnessed between them and giant squid. The giant squid may also have given rise to the Norwegian myth of the sea-monster, the Kraken. The cock-eyed squid has one big eye and one small eye, and its underside if studded with light organs. Cranchid squid are jelly-like and concentrate ammonia in their blood. This makes them neutrally buoyant, so they do not have to swim constantly. 

There is so much of our ocean yet to explore. Scientists are still finding new species in the depths of the ocean – such as new crustacean genus’ and species in the Abyssal depths in the Japan trench.  While there is much we still don’t know about the deepest, darkest parts of our oceans, one thing we do know is that deep sea farming can be detrimental to those species of both flora and fauna that call those parts home.

Images: 1) Champagne vent white smokers by NOAA. Public domain via Wikimedia Commons. 2) Octopus by glucosala. Public domain via Pixabay. 3) Chauliodus sloani abissal fish arriving in surface waters in the Straits of Messina (permission of prof. Francesco Costa). CC BY-SA 3.0 via Wikimedia Commons. 4) ALVIN submersible by NOAA. Public domain via Wikimedia Commons.

[focusonthegoodnews]

Microscopic ocean predator with a taste for carbon capture

Microscopic ocean predator with a taste for carbon capture

Good News Notes: “Scientists at the University of Technology Sydney (UTS) have discovered a new species that has the potential to sequester carbon naturally, even as oceans warm and become more acidic. The microbe, abundant around the world, photosynthesises and releases a carbon-rich exopolymer that attracts and immobilizes other microbes. It then eats some of the entrapped prey before…

[mbari-blog]

The Global Ocean Biogeochemistry (GO-BGC) Array is building a network of chemical and biological sensors that will monitor ocean health from pole to pole. Building on the Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) program which deployed hundreds of robotic floats with biogeochemical sensors in the Southern Ocean, this game-changing technology is transforming how oceanographers and climate scientists observe and understand our changing ocean. 

The MATE ROV Competition uses underwater robots to inspire and challenge students to learn and creatively apply science, technology, engineering, and math (STEM) to solve real-world problems and strengthen their critical thinking, collaboration, entrepreneurship, and innovation. As part of the GO-BGC outreach efforts, the MATE ROV Competition offered a MATE Floats! “satellite” challenge. In this challenge, teams of students in grades 4–16 are tasked with building a float that uses active ballasting to descend to depth and back to the surface.

At the 2022 Monterey Bay Regional MATE ROV Competition, students showcased their floats and learned about the challenges of developing, building, and deploying ocean science technology. This program inspires students to explore STEM fields and many of them go on to become the engineers and scientists that are building the next generation of ocean technology. In 2022, the MATE ROV Competition is highlighting the United Nations Decade of Ocean Science for Sustainable Development and inspiring our global community to embrace environmental, social, and governance (ESG) efforts to create a sustainable future on our ocean planet. 

The MATE ROV Competition was created by The Marine Advanced Technology Education (MATE) Center, a national partnership of organizations working to improve marine technical education and in this way help to prepare America’s future workforce for ocean occupations.

[esgounder]

New OCB Research :: Ocean Carbon & Biogeochemistry

[sciencespies]

'Subterranean estuaries' crucial to sustainable fishing and aquaculture industries

https://sciencespies.com/nature/subterranean-estuaries-crucial-to-sustainable-fishing-and-aquaculture-industries/

'Subterranean estuaries' crucial to sustainable fishing and aquaculture industries

Pioneering research, led by a team from Trinity College Dublin and the Marine Research Institute of the Spanish Research Council (IIM-CSIC) in Vigo (Galicia, Spain), suggests “subterranean estuaries” may be critical in managing sustainable fishing and aquaculture — two growing industries of global importance.

Subterranean estuaries are analogous to surface water estuaries, where freshwater flowing out to sea mixes with seawater, but are instead located underground, invisible to the naked eye. Yet the newly published research shows these hidden features are very important in the ecology of coastal systems and in filtering pollutants — some of which have been slowly travelling to sea for decades having leached from agricultural soils.

The research, just published open access in Limnology and Oceanography, uncovered subterranean estuaries in the Ria de Vigo in Galicia (one of the most productive coastal ecosystems in Europe and leader in bivalve production for human consumption) and assessed their importance to the coastal environment.

By employing a selection of natural environmental tracers that carry the chemical fingerprints of groundwater sources on land out to sea, the team estimated that almost 25% of the continental freshwater discharged to the Ria de Vigo comes from this invisible source.

The Biogeochemistry Research Group of Trinity’s School of Natural Sciences, led the study (Project SUBACID). Explaining the significance of the work, and its wider implications for Irish waters, Carlos Rocha, Professor in Environmental Change, said:

“Bivalve aquaculture is a strategic, expanding sector in Irish sustainable development and features highly in the national plans to diversify food production. While our work was conducted in the Ria de Vigo, this area was carefully selected because of its capability to support aquaculture and its biogeographic similarity to parts of the Irish coastline.

“These subterranean estuaries have a high capability to filter out pollutants, like fertilisers, from freshwater. Given the extent to which they supply large ecosystems with incoming freshwater, they have a much more important role to play than many would have believed.”

Juan Severino Pino Ibánhez, researcher from the Marine Research Institute-CSIC (Spain), added:

“We will now focus in more detail on which specific ecosystem services these invisible structures provide, and how they might affect, for example, the ongoing threat to this industry posed by ocean acidification caused by anthropogenic CO2 emissions to the atmosphere.

“We are currently strengthening the collaborative network established with the Marine Research Institute of Vigo to elucidate the functioning of these hidden ecosystems and their role in coastal health and resilience. Lessons learnt in Vigo together with ongoing research made by our group in Irish coastal ecosystems will help to understand the future of Irish coastal ecosystem services and food production.”

Story Source:

Materials provided by Trinity College Dublin. Note: Content may be edited for style and length.

#Nature

[nailsalon75034]

The T shirt king arowana fish for you

the-shirt-king-arowana-for-you by themagpie robinbird

Arowana is a very rare, freshwater fish listed in the Red Book of the world and is a fish that is extremely loved by aquarium hobbyists. However, this is also an easy fish to keep, if you do not learn carefully about habits, food or birth, it is difficult to maintain a beautiful arowana tank. Therefore, many people, when seeing arowanas, have been "attracted" but also "worked hard and hard" to raise this fish. welcome to learn the basic knowledge needed to be able to start nurturing arowanas, everyone! and Don't forget, if you own this arowana T shirt, the lucky will come to you

https://en.wikipedia.org/wiki/Aquarium

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[evoldir]

Fwd: Job: WoodsHoleOceanographicInst.MarineVirologist

Begin forwarded message: > From: evoldir@evol.biology.mcmaster.ca > Subject: Job: WoodsHoleOceanographicInst.MarineVirologist > Date: 21 October 2023 at 07:39:24 BST > To: rdmpage@gmail.com > > > > Note - not explicitly seeking an evolutionary biologist, but viral > evolution / diversity are areas of interest. - CT > > The Biology Department at the Woods Hole Oceanographic Institution > (WHOI) invites candidates to apply to the open full-time, Tenure Track > Scientist position in Marine Virology on our scientific staff*. We seek > to hire one scientist at the pre-tenure level. > > �We are seeking candidates with potential to complement or diversify > our existing strengths in biology and biological oceanography. We invite > expansive interpretations of our research, teaching, and scholarly > pursuits and welcome interdisciplinary approaches. While we invite > applications from researchers with interest in any area related to the > biology of marine systems, we are particularly interested in applicants > who conduct research in marine virology. Area of focus may include (but > not limited to) viral diversity, viral ecology, virus-host interactions > and evolution, and viral impact on animal health and/or > biogeochemistry.� Candidates employing experimental, observational, > and/or modeling approaches are welcome. > > Full details here: > > https://ift.tt/5vn3zNH > > > ctepolt@whoi.edu > > (to subscribe/unsubscribe the EvolDir send mail to > golding@mcmaster.ca