Ian Duggan's Avatar

Ian Duggan

@icdugg.bsky.social

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

105 Followers  |  143 Following  |  31 Posts  |  Joined: 28.01.2025
Posts Following

Posts by Ian Duggan (@icdugg.bsky.social)

You are going to have a nice surprise to wake up to!

25.02.2026 18:32 — 👍 2    🔁 0    💬 1    📌 0
Neotrichozetes spinulosa, aka the Hellraiser Mite, a small big covered in urticating hairs that make it look like pinhead

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

in this picture of a hellraiser mite its blood red colour is more obvious

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...

16.02.2026 06:42 — 👍 189    🔁 31    💬 14    📌 3

You unfortunately missed it by a couple of weeks, @boondockallegorist.bsky.social!

16.02.2026 07:44 — 👍 0    🔁 0    💬 0    📌 0

I've never made it to Oamaru Botanic Gardens! Hopefully I will get there in the next couple of years....

15.02.2026 22:35 — 👍 2    🔁 0    💬 1    📌 0

Yes, a lot of work by a lot of people over a number of years, though it was also a little neglected in the last few years. It was great that Gemma could find some time to pull it all together, because it is a useful bit of work! I hope you are doing well Liz!

15.02.2026 22:06 — 👍 1    🔁 0    💬 1    📌 0
Preview
Diversity and Potential Endemism of New Zealand Freshwater Rotifers Revealed Using Mitochondrial DNA Barcodes Rotifers perform key functions in aquatic food webs and respond to environmental changes, thus providing sensitive indicators of water quality. However, rotifers are small, highly diverse, and diffic...

While my first 7 papers were on all rotifers, this is my first to focus exclusively on this group since 2002. It's especially great to publish with Gemma, who I first met while teaching a summer science experience for school kids back in 2007!

rsnz.onlinelibrary.wiley.com/doi/10.1002/...

15.02.2026 21:57 — 👍 1    🔁 0    💬 0    📌 0
Post image

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.

15.02.2026 21:57 — 👍 4    🔁 2    💬 2    📌 0
Preview
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.

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...

11.02.2026 23:52 — 👍 3    🔁 1    💬 1    📌 0
Post image

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.

06.02.2026 03:16 — 👍 3    🔁 1    💬 1    📌 0
Post image Post image Post image

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!

05.02.2026 23:46 — 👍 2    🔁 0    💬 0    📌 0

Go for length, Ian.

04.02.2026 20:56 — 👍 3    🔁 3    💬 1    📌 0

I've said it once, and I'll say it again - vote quality not quantity!

05.02.2026 05:18 — 👍 0    🔁 0    💬 0    📌 0
Preview
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...

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...

04.02.2026 09:38 — 👍 5    🔁 4    💬 0    📌 1
Preview
'We were horrified': DoC shock as ducks filmed eating native chicks alive DoC has euthanised three mallards from Lake Alexandrina to stop copycat attacks.

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...

04.02.2026 04:44 — 👍 1    🔁 0    💬 0    📌 0
Preview
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.

Gold clam detecting dogs - Some work from my colleagues.

www.nzherald.co.nz/waikato-news...

22.01.2026 19:04 — 👍 2    🔁 1    💬 0    📌 0
Post image Post image

It's been a few months since the last dragon fruit update, but they have now been planted in a bigger pot outside.

29.11.2025 23:24 — 👍 1    🔁 0    💬 0    📌 0
Post image

Pleated inkcaps growing on the lawn.

29.11.2025 21:07 — 👍 1    🔁 0    💬 0    📌 0
Preview
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.

Uh oh... Corbicula has spread byond the Waikato River to Lake Rotomanu in Taranaki.

www.rnz.co.nz/news/nationa...

11.11.2025 11:41 — 👍 0    🔁 1    💬 0    📌 0
Post image Post image

Separated at birth. Ruud Kleinpaste's 'Scratching for a Living' and Witi Ihimaera's 'The Matriarch'.

26.10.2025 01:03 — 👍 1    🔁 0    💬 0    📌 0
Preview
(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 ...

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.

29.09.2025 04:54 — 👍 21    🔁 13    💬 1    📌 1

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.

12.08.2025 11:22 — 👍 59    🔁 1    💬 1    📌 1

lol

15.09.2025 23:46 — 👍 0    🔁 0    💬 1    📌 0

Nice work Simon Stewart @troybaisden.bsky.social @icdugg.bsky.social et al. #Lakes are Earth’s eye indeed. 🧪

15.09.2025 07:07 — 👍 9    🔁 4    💬 0    📌 0
Preview
Hypolimnetic Nutrient Subsidies to Surface Waters of a Large Lake: A Coupled Hydrodynamic Modelling and Nitrogen Isotope Field Assessment - Ecosystems Upwelling of hypolimnetic water in lakes is important for littoral food webs as it enhances production through nutrient subsidies to surface waters. The aim of this study was to understand the role of...

link.springer.com/article/10.1...

29.08.2025 21:19 — 👍 0    🔁 0    💬 0    📌 0
Post image

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.

29.08.2025 21:18 — 👍 1    🔁 0    💬 1    📌 0
Preview
Live snake found in Christchurch traveller's suitcase It slid past customs.

"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...

29.08.2025 20:58 — 👍 0    🔁 0    💬 0    📌 0
Preview
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

"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/...

04.07.2025 12:57 — 👍 1    🔁 0    💬 0    📌 0

oops, haven't been her in a little while...! But it seems most likely to be a Lecane!

20.05.2025 04:37 — 👍 2    🔁 0    💬 0    📌 0
Post image

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

18.04.2025 06:00 — 👍 5    🔁 3    💬 0    📌 0
Video thumbnail

Western Springs eels #tuna #longfineels #auckland

12.04.2025 23:57 — 👍 17    🔁 4    💬 0    📌 0