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Ian Duggan

@icdugg.bsky.social
134 followers 181 following 51 posts

#Freshwater #Invasion biologist, #zooplankton ecologist, and sometime environmental historian. Ngāi Tahu. Keyboards at Bitter Defeat and tweet for @gardhistnz.bsky.social

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Ian Duggan @icdugg.bsky.social · 11/09/2026
Using marmite as bait to find undescribed fish at the bottom of NZs deepest lakes. Amazing!
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Dan @danxduran.bsky.social · 11/09/2026
Sometimes you get assigned a story that basically writes its own headline... this was mine tonight
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Anthony Ricciardi @ecoinvasions.bsky.social · 26/08/2026
I highlighted this in my talk at #ICAIS2026: Regulation of ship ballast water release has caused a remarkable 85% decline in the rate of invasion of the Great Lakes over ~20 yrs. This success story is a model for Target 6 of the Kunming-Montreal GBF. conbio.onlinelibrary.wiley.com/doi/full/10....
conbio.onlinelibrary.wiley.com
Vector control reduces the rate of species invasion in the world's largest freshwater ecosystem
The Great Lakes-St Lawrence River basin is the world's most invaded freshwater system. Ballast water release from transoceanic shipping is deemed responsible for 65% of invasions in the basin since t....
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Ian Duggan @icdugg.bsky.social · 25/08/2026
As a rotiferologist from way back, it was nice to watch a talk on Kellicottia today, and its invasion of Brazil (well, that bit isn't so nice!). This genus isn't known from New Zealand yet, but is so distinctive, it is impossible to mistake it for anything else. #ICAIS2026
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Ian Duggan @icdugg.bsky.social · 25/08/2026
Nice talk, @milkinabag.bsky.social! A nice demonstration of how invader inoculation densities influence establishment success (i.e., propagule pressure). No, I wouldn't want to hang around mesocosms containing cholera also! #icais2026
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The International Conference on Aquatic Invasive Species @icaisorg.bsky.social · 25/08/2026
Welcome to day 2 of #ICAIS2026! We started today with our plenaries Ian Duggan with ‘Lessons from research on vectors for the movement of freshwater invertebrates in New Zealand’ and Melodie McGeoch with ‘Governing biological invasions under rapid environmental change’
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Ian Duggan @icdugg.bsky.social · 24/08/2026
What a wonderful way to start the regular sessions at ACAIS2026. Tony Ricciardi (@ecoinvasions.bsky.social) discusses changes in invasions in the Great Lakes: his gateway drug, the zebra mussel; why invasion rates have changed through time, and, cage fighting amphipods. #icais2026
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Ian Duggan @icdugg.bsky.social · 18/08/2026
Gold Clams have moved from the Waikato into Auckland, arriving at the most obvious place imaginable. Where the pipes carrying water from the Waikato River go to. www.teaonews.co.nz/2026/08/18/g...
teaonews.co.nz
Gold clams found near Glenbrook mill spark iwi fears
Invasive gold clams found near NZ Steel’s Glenbrook mill spark iwi fears for the mauri of ancestral waters. Authorities probe pipelines, await eDNA results, and assess spread risks
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Frank Burdon @fburdon.bsky.social · 10/06/2026
Read more about this research here:
link.springer.com
Invasive catfish linked to the decline of freshwater crayfish in two Aotearoa New Zealand lakes - Biological Invasions
The introduction of invasive species can have profound impacts on ecosystems, especially where endemic species have evolved in isolation. However, determining the influence of invasive species on nati...
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Australian Society for Fish Biology @austsocfishbiol.bsky.social · 01/07/2026
📑 #NewStudy by Kusabs et al. studied a catfish invasion of two lakes in Aotearoa New Zealand, to see if predation was causing a decline in a freshwater crayfish with severe cultural ramifications. 👀 doi.org/10.1007/s105...
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Ian Duggan @icdugg.bsky.social · 11/07/2026
Feeling a bit sore after a walk up to Wairoa Reservoir with the kids today! One of Auckland's water supply reservoirs, completed in 1975, at a time when Auckland was beginning to suffer from summer water shortages.
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Ian Duggan @icdugg.bsky.social · 25/06/2026
Never mind what Andy Zaltman - British comedian, author, broadcaster, and cricket statistician - is saying about the cricket, he is wearing a shirt covered in diatoms! @zaltzcricket.bsky.social
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The Ricciardians @ricciardilab.bsky.social · 11/06/2026
Cool study of the impact of an introduced North American freshwater fish on crayfish in New Zealand.
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Frank Burdon @fburdon.bsky.social · 10/06/2026
Invasive species are widely recognised as a major threat to biodiversity—yet quantifying their true impact can be challenging without long-term data. Our recent research highlights just how significant these effects can be.
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Ian Duggan @icdugg.bsky.social · 27/03/2026
For my lab today I wanted to add in some tardigrades, which I ended up finding living in moss and lichen on a tree. This is the same specimen, the second (in the comments) slightly more squashed as the water evaporated, where you can see the mouthparts and claws with a bit more clarity. #tardigrade
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Ian Duggan @icdugg.bsky.social · 23/03/2026
A nice big rotifer, Brachionus calyciflorus, whose massive spines suggest her mother was exposed to some predators (likely another rotifer, Asplanchna). Two different planes of focus.
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Ian Duggan @icdugg.bsky.social · 21/03/2026
Monarchs got to New Zealand by themselves, but couldn't survive here until swan plants/milkweed had been introduced, which was likely as seeds in the stuffing of pillows with arrivals from South Africa. The wasps have taken most of our monarchs the last few years, but this one has been a survivor.
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The International Conference on Aquatic Invasive Species @icaisorg.bsky.social · 17/03/2026
📢 📢 2 Weeks Remain | Early Registration for ICAIS 2026 ends on March 31. Register now to take advantage of reduced fees. Learn more and register: bit.ly/3J0O3JX
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Ian Duggan @icdugg.bsky.social · 20/03/2026
In my samples today, Wolffia australiana, which is recognized as one of the world’s smallest flowering plants.
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The International Conference on Aquatic Invasive Species @icaisorg.bsky.social · 05/03/2026
Plenary Speaker Announcement | We are pleased to announce that Ian Duggan will be presenting ‘Mitigation trumps remediation: Lesson from research on vectors for the movement of freshwater invertebrates in New Zealand’ at ICAIS 2026.
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Sascha Stronach🏳️‍⚧️, The Sunforge out now @understatesmen.bsky.social · 16/02/2026
Voting for New Zealand Bug of the Year closes in a few short hours! You don't need to be local to vote. This year I'm team Hellraiser Mite, because every year I pick the freakiest l'il guy I can find and just look at him. bugoftheyear.ento.org.nz/vote-here-20...
Neotrichozetes spinulosa, aka the Hellraiser Mite, a small big covered in urticating hairs that make it look like pinhead in this picture of a hellraiser mite its blood red colour is more obvious
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Ian Duggan @icdugg.bsky.social · 15/02/2026
Really happy with this pub from Gemma (@antarctibug.bsky.social), based on sequences of many NZ rotifer taxa we collected over many years. Most NZ rotifer lineages appear to be unique to NZ based on current knowledge, with a few possible invaders in the mix. Useful sequences for eDNA going forward.
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Ian Duggan @icdugg.bsky.social · 11/02/2026
My colleague Nick has been using Waikato University's electrofishing boat to remove huge numbers of non-native koi carp, goldfish, catfish and turtles from Auckland's Western Springs. For the turtles and goldfish, your unwanted pets can become monumental pests! www.rnz.co.nz/news/nationa...
rnz.co.nz
Pest cull at Auckland's Western Springs Lake using electrocurrents
Hundreds of goldfish, turtles and other pests are being pulled from a popular park's lake to be euthanised.
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Ian Duggan @icdugg.bsky.social · 06/02/2026
The Giant Penguin fossil at Waikato Museum - Kairuku waewaeroa - (= food-diver long-legs). It lived in the Oligocene, at a time when Zealandia was almost fully submerged, with small islands and shallow seas prefect for coastal marine life evolution.
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Ian Duggan @icdugg.bsky.social · 05/02/2026
At Waikato Museum, where we stumbled across a virtual microscope display of what's in the Waikato River, featuring a bdelloid rotifer! It's turned my day around!
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Te Pūnaha Matatini @tepunahamatatini.bsky.social · 04/02/2026
Go for length, Ian.
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Ian Duggan @icdugg.bsky.social · 04/02/2026
It's Bug of the Year time in NZ! Despite all being 'macroinvertebrates', there are some really good selections this year! Am I on team NZ Flatworm for being one of the invaders we have had go the other way? Or go aquatic Team Tadpole Shrimp or Intertidal Caddisfly...? www.rnz.co.nz/national/pro...
rnz.co.nz
Which bug is the mightiest of the year?
You've probably all heard of Bird of the Year, but Bug of the Year might be new to you. Much like the name suggests, it is a competition pitting critters against each other. (Yes, we know the word "bu...
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Ian Duggan @icdugg.bsky.social · 04/02/2026
This is so crazy! Invasive mallards in NZ have been observed preying on the chicks of our "bird of the century", pūteketeke. "This duck behaviour was unknown to DoC experts, and there was a concern that it would spread, as ducks learned from each other". www.nzherald.co.nz/nz/doc-fears...
nzherald.co.nz
'We were horrified': DoC shock as ducks filmed eating native chicks alive
DoC has euthanised three mallards from Lake Alexandrina to stop copycat attacks.
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Ian Duggan @icdugg.bsky.social · 22/01/2026
Gold clam detecting dogs - Some work from my colleagues. www.nzherald.co.nz/waikato-news...
nzherald.co.nz
Meet the dogs sniffing out a tiny clam threatening Waikato waterways
Gold clams can form carpets of up to 10,000 clams per square metre.
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Ian Duggan @icdugg.bsky.social · 29/11/2025
It's been a few months since the last dragon fruit update, but they have now been planted in a bigger pot outside.
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Ian Duggan @icdugg.bsky.social · 29/11/2025
Pleated inkcaps growing on the lawn.
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Ian Duggan @icdugg.bsky.social · 11/11/2025
Uh oh... Corbicula has spread byond the Waikato River to Lake Rotomanu in Taranaki. www.rnz.co.nz/news/nationa...
rnz.co.nz
Lake Rotomanu closed to motorised boats after discovery of invasive clam
Taranaki Regional Council said it was unknown how the clams got into the lake, but the focus now was making sure they did not spread to other Taranaki lakes or rivers.
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Ian Duggan @icdugg.bsky.social · 26/10/2025
Separated at birth. Ruud Kleinpaste's 'Scratching for a Living' and Witi Ihimaera's 'The Matriarch'.
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Margaret Stanley @ecostanley.bsky.social · 29/09/2025
A great initiative from Te Tira Whakamātaki - peltswithpurpose.raiselysite.com/en/ What is unwanted here (possums) is a taonga (treasure) in Te Whenua-a-Moemoeā (Australia). Māori possum hunters supply Aboriginal communities (for cultural revitalisation). Donations enable rangatahi exchanges.
peltswithpurpose.raiselysite.com
(Re)storying the Possum - Pelts with Purpose
Possums destroy native species. But what is unwanted here is a taonga across the Tasman. Help us gather and prepare possum pelts for Aboriginal communities to use, all while restoring biodiversity at ...
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Kathryn @shermarama.bsky.social · 12/08/2025
I know a man who is a university lecturer doing Proper Science with zooplankton, and is also New Zealand's leading garden gnome historian. This seems fine to me.
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Cilla Wehi @cillaw.bsky.social · 15/09/2025
Nice work Simon Stewart @troybaisden.bsky.social @icdugg.bsky.social et al. #Lakes are Earth’s eye indeed. 🧪
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Ian Duggan @icdugg.bsky.social · 29/08/2025
New paper! "Hypolimnetic Nutrient Subsidies to Surface Waters of a Large Lake: A Coupled Hydrodynamic Modelling and Nitrogen Isotope Field"; Upwelling of hypolimnetic water is important for lake littoral food webs, including for our freshwater mussel, kākahi (Echyridella menziesii) in Lake Taupō.
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Ian Duggan @icdugg.bsky.social · 29/08/2025
"A small live snake has been found at the home of a Christchurch traveller who had just returned home from Bali." www.rnz.co.nz/news/nationa...
rnz.co.nz
Live snake found in Christchurch traveller's suitcase
It slid past customs.
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Ian Duggan @icdugg.bsky.social · 04/07/2025
"Populations of the New Zealand flatworm are growing in Scotland and northern England... The sharp increase in non-native species in recent decades is attributed to global trade, particularly in potted plants and soils..." www.theguardian.com/environment/...
theguardian.com
Pot-plant trade is ‘hitchhiker pathway’ for invasive flatworms, say UK experts
Rise in sightings prompts call for ban on soil imports, to prevent entry of more species that eat earthworms and degrade soil
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INVASIVESNET @invasivesnet.bsky.social · 18/04/2025
Explore a Special Issue of Management of Biological Invasions (MBI) on advances in the study of the management of biological invasions in inland waters and the legacy of Gordon Howard Copp (1956–2023) 👇 buff.ly/yS9hwpf #INVASIVESNET #MBI #GuardIAS
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Ben Paris @nzbatman.bsky.social · 13/04/2025
Western Springs eels #tuna #longfineels #auckland
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The Ricciardians @ricciardilab.bsky.social · 08/04/2025
Tardigrades are finally recognized for being awesome. www.theguardian.com/commentisfre...
theguardian.com
It’s heroic, hardy and less than a millimetre long: meet the 2025 invertebrate of the year | Patrick Barkham
Guardian readers around the world voted in the this year’s contest, but which creature won, asks natural history writer Patrick Barkham
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Chrissie Painting @cpaintingnz.bsky.social · 05/04/2025
Wanna come work with me? We're advertising a fixed term Lecturer in Animal Behaviour at Waikato. We're especially keen on someone who works on birds, reptiles, bats etc. Let me know if you have questions! www.seek.co.nz/job/83279795...
seek.co.nz
Lecturer - Animal Behaviour Job in Hillcrest, Waikato - SEEK
Seeking an enthusiastic Lecturer in Animal Behaviour to teach, research, and supervise in ecology, biodiversity, and animal behaviour.
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Ian Duggan @icdugg.bsky.social · 30/03/2025
As the temperatures start to cool, we are finally getting a few monarch caterpillars making it to a decent age, safe from the wasps.
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Nina Munteanu @aliennextdoor.bsky.social · 29/03/2025
I've nominated the bdelloid rotifer for The Guardian's "Invertebrate of the Year" and out of over 2000 nominations it got shortlisted... WOOHOO! Go see and vote: #InvertebrateOfTheYear #TheGuardian #bdelloid #rotifer www.theguardian.com/environment/...
theguardian.com
All-female and able to survive 24,000 years on ice: all hail the resilient rotifer
Tiny aquatic animal can also withstand desiccation, radiation and extreme heat, and reproduces asexually
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Ian Duggan @icdugg.bsky.social · 30/03/2025
All hail the resilient rotifer! All-female and able to survive 24,000 years on ice - the bdelloid rotifer in the running for The Guardian's 2025 invertebrate of the year! www.theguardian.com/environment/...
theguardian.com
All-female and able to survive 24,000 years on ice: all hail the resilient rotifer
Tiny aquatic animal can also withstand desiccation, radiation and extreme heat, and reproduces asexually
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Ian Duggan @icdugg.bsky.social · 07/03/2025
Teaching zooplankton on the Tauranga campus today. These are some nice trophi ("teeth") eroded from the predatory rotifer Asplanchna priodonta.
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Shy🐶Berry @shyberry.bsky.social · 31/01/2025
Rotifers! Found in a marine turtle at the clinic today. Not strictly a parasite - they eat alge with their rotor shaped mouths but can cause G.I. blockage in turtles. #turtle #parasites #microscopy
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Ian Duggan @icdugg.bsky.social · 27/02/2025
Recently described species: Pentaceration forkandbrewer – a marine isopod that was given its scientific name after Wellington brewpub Fork and Brewer brewed the best beer as part of The Crustacean Beer Competition at the 10th International Crustacean Congress. niwa.co.nz/news/cheers-...
niwa.co.nz
Cheers to crustaceans: New species named after Welly brewery
A new species has been named after favourite Wellington brewpub Fork and Brewer
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Ian Duggan @icdugg.bsky.social · 13/02/2025
Interesting colours on this bit of detritus in my sample tonight, amongst the Ceratium and pine pollen. Probably a small fragment of plastic off something.
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