Science8 min read
Counting Fish With Sound: Acoustic Surveys Explained
How do you count fish you can't see? Acoustic surveys use sonar to turn echoes into biomass estimates. Here's how echosounders work — and their limits.
Dr. Mara Ellison ·
#ocean-science
48 articles
Science11 min read
Argo Floats: The Ocean's Global Thermometer Network
Nearly 4,000 drifting robots take the ocean's temperature from within. How Argo profiling floats work, what they measure, and why the data is free.
Dr. Lena Fischer ·
Science10 min read
Benthic-Pelagic Coupling: How the Seafloor and the Water Column Talk
Food produced in sunlit surface water rains down to feed the seafloor, and the seafloor recycles nutrients back up. How benthic-pelagic coupling runs a kelp forest.
Dr. Mara Ellison ·
Science9 min read
Bioluminescence: Why the Sea Lights Up at Night
Glowing waves, sparkling wakes and milky seas: the chemistry and ecology of bioluminescence, and how to see the ocean light up yourself.
Dr. Mara Ellison ·
Blue Carbon11 min read
Field Sampling for Kelp Carbon: Plot Design, Replicates and Honest Error Bars
Good kelp carbon claims start with good field design. A practical guide to plots, transects, replicates, stratification and the statistics of underwater surveys.
Dr. Mara Ellison ·
Science9 min read
Eutrophication on the Coast: When Too Much Food Sinks the Forest
Nutrient pollution feeds opportunistic algae that shade and smother kelp, while rotting blooms strip oxygen. How eutrophication degrades kelp coasts.
Dr. Theo Nakamura ·
Science10 min read
The CTD Cast: How Oceanographers Read a Column of Water
A CTD cast reads temperature, salt and depth through the whole water column. Inside the instrument that gave oceanography its vertical vision.
Dr. Lena Fischer ·
Science9 min read
The Largest Commute on Earth: Diel Vertical Migration Below the Kelp
Every night, billions of animals rise hundreds of metres to feed, then sink before dawn. How the largest daily migration on Earth threads through kelp food webs.
Dr. Mara Ellison ·
Science9 min read
Internal Waves: The Invisible Surf Breaking on Reefs
The ocean's biggest waves never break the surface. How internal waves ride the hidden boundary between water layers and deliver cold nutrients to kelp forests.
Dr. Lena Fischer ·
Science10 min read
Kelp as Ecosystem Engineer: Building Habitat From Sunlight
Kelp doesn't just grow — it builds. As an ecosystem engineer, kelp reshapes light, flow, chemistry and shelter to create habitat for thousands of species.
Dr. Mara Ellison ·
Science8 min read
Where Kelp Carbon Goes: Detritus, Drift and the Deep Sea
Kelp grows fast and dies young. Follow its carbon from sunlit blade to beach wrack, deep-sea fall and seafloor sediment — the full journey of kelp detritus.
Dr. Lena Fischer ·
Blue Carbon11 min read
Where Kelp Carbon Goes: The Pathways from Canopy to Deep Sea
Kelp forests don't bury carbon where they grow — they export it. Tracing fragments, dissolved carbon and currents from canopy to the deep sea, and how science tracks them.
Dr. Mara Ellison ·
Science8 min read
Kelp Phenology: The Seasonal Clock of a Forest
Kelp forests run on an annual clock of light, temperature and nutrients. Learn how kelp phenology works, why it's shifting, and why timing runs restoration.
Dr. Theo Nakamura ·
Science10 min read
Kelp vs Seagrass: The Difference Between the Ocean's Two Great Meadows
Kelp is an alga; seagrass is a flowering plant. How the ocean's two great habitats differ in biology, range, carbon storage and the ways we restore them.
Dr. Theo Nakamura ·
Science9 min read
King Tides Explained: Perigee, Syzygy and the Highest Water of the Year
King tides are the year's highest tides — astronomy, not weather. How perigee, syzygy and the solstices stack up, and why they preview our coastal future.
Dr. Lena Fischer ·
Science9 min read
How Far Does a Spore Travel? Connectivity and Recovery in Kelp Forests
Kelp spores rarely travel far, while fish and invertebrate larvae ride currents for weeks. How dispersal distance shapes reef recovery and restoration design.
Dr. Elias Brandt ·
Science10 min read
Drifters and Swimmers: How Marine Life Colonises New Reefs
Almost every reef animal and alga spreads as a drifting larva or spore. How far they travel — and which reefs talk to which — decides how kelp recovers.
Dr. Mara Ellison ·
Science9 min read
The Marine Nitrogen Cycle: The Element Budget Behind Every Kelp Blade
Nitrogen feeds every kelp blade and limits most ocean growth. A plain-language tour of the marine nitrogen cycle — fixation, upwelling, uptake and loss.
Dr. Theo Nakamura ·
Science8 min read
Marine Snow: The Ocean's Slow Carbon Conveyor
Marine snow is the ocean's constant drizzle of sinking organic matter — and one of the main routes by which carbon reaches the deep sea. Here's how it works.
Priya Raman ·
Science8 min read
Marine Snow: The Ocean's Slow Carbon Rain
Marine snow is more than falling debris — each flake is a sticky, living microhabitat. How aggregates form, who lives on them, and why they matter.
Dr. Theo Nakamura ·
Blue Carbon10 min read
Measuring Kelp Carbon Export: The Methods Behind the Numbers
Kelp carbon counts only when it leaves the forest and stays gone. The traps, biomarkers, isotopes and models scientists use to track it into the deep.
Priya Raman ·
Science10 min read
Microplastics in Kelp Forests: What We Know and Don't
Tiny plastic fragments have reached every ocean habitat, kelp forests included. What the evidence shows about microplastics on reefs — and the honest gaps.
Dr. Mara Ellison ·
Science10 min read
Why the Ocean Changes Colour: Chlorophyll From Space
Why the sea turns green, turquoise or milky — and how ocean-colour satellites read chlorophyll from orbit to map blooms, currents and ocean life.
Dr. Mara Ellison ·
Science10 min read
Ocean Deoxygenation: The Ocean's Breathlessness
The ocean is losing oxygen — measurably and globally. How warming and nutrient stress squeeze marine life's air supply, and what that does to kelp forests.
Dr. Lena Fischer ·
Science11 min read
Ocean Gliders: Slow Robots, Long Missions
Ocean gliders ride buoyancy, not propellers, for months at sea. How these slow torpedo-shaped robots survey storms, currents and kelp coasts on sips of power.
Dr. Mara Ellison ·
Science10 min read
Ocean Gyres: The Great Slow Wheels of the Sea
Five vast gyres turn like slow wheels in every ocean basin, shaping currents, climate and where plastic gathers. Here's how ocean gyres actually work.
Dr. Lena Fischer ·
Science10 min read
Ocean Heat Content: How We Measure a Warming Ocean
Over 90 percent of the planet's trapped heat is in the ocean. How we measure ocean heat content, from expendable probes to 4,000 drifting floats — and why it matters.
Dr. Lena Fischer ·
Science12 min read
The Ocean's Nutrient Engine: Nitrogen, Phosphorus, Silica and Iron
Kelp blades and diatom blooms run on four nutrients: nitrogen, phosphorus, silica and iron. Where each comes from, where it runs out, and why that shapes the sea.
Dr. Theo Nakamura ·
Science9 min read
Wired Reefs: What Cabled Ocean Observatories See That Ships Can't
Cabled ocean observatories plug the deep sea into fibre and power, streaming data around the clock. What these wired reefs see that research ships can't.
Dr. Lena Fischer ·
Science9 min read
Turbidity: What a Storm Does to the Light Kelp Needs
Storms turn coastal water murky, dimming the light kelp depends on. How turbidity works, where the sediment comes from, and how long forests stay in the dark.
Dr. Mara Ellison ·
Science9 min read
Turbulence and Kelp: How Small-Scale Mixing Feeds Every Blade
Kelp blades can't drink faster than the water next to them allows. How blade-scale turbulence and boundary layers quietly control how fast a whole forest eats.
Dr. Lena Fischer ·
Science9 min read
Where Rivers Meet the Kelp: Freshwater Plumes, Sediment and Stress
River plumes deliver nutrients that feed kelp forests — and floods that smother them in sediment and fresh water. The double-edged physics of the river mouth.
Dr. Lena Fischer ·
Science8 min read
ROVs in Reef Science: When the Diver Can't Go
Some reefs are too deep, too cold or too dangerous for divers. Remotely operated vehicles take the instruments instead. How ROVs changed reef science.
Tom Okafor ·
Science10 min read
Sea Star Wasting Disease: The Epidemic That Starved a Coast
From 2013, sea star wasting liquefied stars from Alaska to Mexico and erased the sunflower star, a keystone urchin predator. The science, and the kelp fallout.
Dr. Mara Ellison ·
Science9 min read
Seascape Connectivity: How Kelp, Seagrass and Estuaries Talk to Each Other
Kelp forests, seagrass meadows and estuaries trade food, animals and larvae across the coastal mosaic. Why connectivity — not patch size — decides resilience.
Dr. Mara Ellison ·
Science8 min read
Sediment Traps: Catching Carbon on Its Way Down
How do we measure carbon sinking through ocean? Sediment traps — moored funnels hundreds of metres deep — catch marine snow and tally the export flux.
Dr. Lena Fischer ·
Science9 min read
Reading Diets in Isotopes: How Carbon and Nitrogen Ratios Trace Kelp Food Webs
Carbon and nitrogen isotope ratios let ecologists read what reef animals actually ate — and whether kelp carbon reached them. Here's how the method works.
Dr. Mara Ellison ·
Science8 min read
Stable Isotopes: Following Kelp Carbon Through the Food Web
Kelp carbon carries a chemical fingerprint. Stable isotope analysis lets ecologists trace it from blade to grazer to fish — and test restoration claims.
Dr. Theo Nakamura ·
Science8 min read
How Tides Work: Springs, Neaps and the Shape of the Shore
Tides move more water than all the world's rivers. A clear guide to why the sea rises and falls — moon, sun, spring and neap tides, and what it all means for kelp.
Dr. Lena Fischer ·
Science9 min read
Wave Refraction: Why Headlands Are Wild and Bays Are Calm
Waves bend toward shallow water, which concentrates energy on headlands and spreads it in bays. How refraction shapes reefs, kelp forests and coastlines.
Dr. Lena Fischer ·
Science9 min read
Why Is Kelp Brown? The Pigment Chemistry of Looking Alive
Kelp looks brown, red seaweeds look red, and grass is green — because each lineage solved the sunlight problem differently. Here's the pigment chemistry of the sea.
Dr. Theo Nakamura ·
Science8 min read
eDNA Surveys: Reading an Entire Kelp Forest from a Bottle of Seawater
Environmental DNA lets scientists census a kelp forest from a few litres of seawater. How eDNA surveys work, what they miss, and why they matter.
Dr. Mara Ellison ·
Blue Carbon9 min read
How Kelp Stores Carbon: The Science, the Sinks, and the Open Questions
Kelp grows as fast as any forest on Earth, but where does its carbon actually go? The genuine science, the real sinks and the honest uncertainties.
Dr. Mara Ellison ·
Science8 min read
How Kelp Photosynthesizes: Fucoxanthin and the Brown Light of the Undersea Forest
Why is kelp brown, not green? The answer is a pigment strategy tuned to underwater light — and it explains how kelp forests become some of Earth's most productive ecosystems.
Dr. Theo Nakamura ·
Science8 min read
The Solubility Pump: The Ocean's Quiet Carbon Conveyor
Cold water drinks CO2, and the overturning circulation locks it away for centuries. How the ocean's solubility carbon pump works — and what it costs.
Dr. Lena Fischer ·
Science9 min read
The Biological Carbon Pump: How Life Moves Carbon to the Deep
Every day, ocean life sends carbon raining into the deep. How the biological carbon pump works, who drives it, and how long its cargo stays buried.
Dr. Lena Fischer ·
Science8 min read
The Redfield Ratio: The Ocean's Chemical Recipe
One ratio — 106 carbon, 16 nitrogen, 1 phosphorus — runs through plankton and deep water alike. What the Redfield ratio reveals about a changing sea.
Dr. Theo Nakamura ·
Careers6 min read
Is a Marine Biology Degree Worth It? An Honest Look
What a marine biology degree actually delivers: the jobs it opens, the salaries it misses, when it pays off, and smarter alternatives for some students.
Dr. Theo Nakamura ·