Believes survival of species with no $$ value is important. Professor, marine conservation, Tasmania, ex-President Reef Life Survey.
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Graham Edgar retweeted
Happy to share my first #PhD paper is now published! We identified 82 shallow reef species around Australia facing extinction risk with decadal declines (>30%) that would qualify them in a threatened category based on the @IUCNRedList criteria🌿🦞🐟 doi.org/10.1016/j.biocon.202…
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Graham Edgar retweeted
🚨New research shows that tropical reef fish communities can be ecologically healthy while providing significant benefits to people, challenging the classical view that #conservation must favour one over the other.
cell.com/one-earth/abstract/…
@FlandrinU, D.Mouillot @CamilleAlbouy @sonia_beja, N.Casajus @JoshuaCinner @gedgar33 @MattiaGhila @FLeprieur @NiLoiseau, A.MacNeil @Eva__Maire @mcleamj, V.Parravicini @loic_pellissier @NinaSchiett, R.Stuart-Smith @Seb_Villeger @NicolasMouquet
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Graham Edgar retweeted
The Ponzi scheme known as population and GDP GROWTH is about to be busted. Good. Time to re-engineer our global economy to clever, conservative circularity = quality of life. >> The world’s population is poised to decline – and that’s great news - johnmenadue.com/the-worlds-p…
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Bi et al mainly looked at variation, not bias.
They assessed depletion relative to BMSY rather than unfished biomass. and found BMSY affected by subjective management decisions on reference points that could change greatly between assessments.
They didn't consider covariates.
Do you have a good sense for why your results are so different from this paper two years ago doing basically the same analysis?
onlinelibrary.wiley.com/doi/…
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Fisheries stocks that are most overfished and in need of management safeguards also suffer from the largest assessment biases.
Our new study indicates that nearly twice as many fishery stocks have collapsed as currently recognized.
science.org/doi/10.1126/scie…
A deep dive into stock assessments of fisheries worldwide has revealed their sustainability is overstated. And it has implications for fisheries management and consumer awareness. Find out more about the IMAS-led study: tinyurl.com/mwyth629
📸 Renata Romeo | Ocean Image Bank
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And support for protecting the Great Southern Reef, where 95% of Australia's unique marine life resides?
Also most people and marine industries?
Heatwave currently off the scale (black) off Tasmania. Current heating plot from NOAA below (6 Mar 24).
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Graham Edgar retweeted
Are fish smaller in warmer waters? If you look at the average fish in the community, then - yes. And we can quantify just how much smaller! @Am_Ro_Co - excellent work. @ReefLifeSurvey @IMASUTAS
NEW STUDY: Mean reef fish body size decreases towards warmer waters
Coghlan et al. analysed 15,000+ surveys across a 15°C SST gradient to find a significant decrease in mean fish body size with warmer waters, averaging a 5% reduction per 1°C increase.
doi.org/10.1111/ele.14375
ALT Temperature gradients in the length-structure of Australian reef fish communities. (a) Mean individual length (cm) of all fishes (bony and cartilaginous) per transect, with mean annual sea surface temperature (SST; °C) across space. (b) As for a, but with mean length calculated for each trophic guild, per transect, separately (note different scales on y-axes). Dashed line shows the average prediction lines. Grey bands show full confidence intervals from both fixed and random effects. Fish icons illustrate the approximate relative mean length of fishes at 15°C and 30°C. Coghlan, Amy Rose, et al. “Mean reef fish body size decreases towards warmer waters.” Ecology Letters, vol. 27, no. 2, 5 Feb. 2024, https://doi.org/10.1111/ele.14375.
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Graham Edgar retweeted
From Adelaide to Tasmania, the @ReefLifeSurvey #greatsouthernreef leg of #lapofaus expedition continued, stopping at Margaret Bock Reef in SA's southeast. Chilly 13°C waters, thanks to Bonney Upwelling. Stunning seaweed assemblages including giant kelp. Images by Stefan Andrews.
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thanks @GSR_Australia and @SBennett_131 for sharing the wonders,
also for contributing so much to our recent voyage with @ReefLifeSurvey volunteers
@SBennett_131 & @gedgar33 from the GSR Research Partnership recently completed a remarkable journey across the #GreatSouthernReef, revisiting sites first surveyed in the '90s to study changes in biodiversity as part of the @ReefLifeSurvey #lapofaus. More from Scott this week.
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Graham Edgar retweeted
Looking for an opportunity to make meaningful contributions to the conservation of marine biodiversity in Australia and globally. Two fully-funded PhDs and a postdoc (details to come). PM me for more details @IMASUTAS
utas.edu.au/research/degrees…
utas.edu.au/research/degrees…
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Graham Edgar retweeted
Climate change & ecology of fishes @PLOSClimate by Nagelkerken @UniofAdelaide @_seachange Booth @DrJDonel @jcu @gedgar33 @ravasi_lab @physiologyfish @adriatix @MellinCamille journals.plos.org/climate/ar…
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Graham Edgar retweeted
“I consider myself a remarkable fella.”
#OnThisDay 1963: David Attenborough met Jack Mulholland, an Irishman who preferred the peace of a ghost town in Borroloola to the pressures of conventional life.
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Port Davey Marine Park, within the Tasmanian Wilderness World Heritage Area, differs from all other divable locations worldwide, with many deepwater species in shallow water.
onlinelibrary.wiley.com/doi/…
After 8 days resurvey:
heating impacts
many missing species
many new species.
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Graham Edgar retweeted
'Resolving when (and where) the Thylacine went extinct' published in STOTEN. Full text now available for free (open access): sciencedirect.com/science/ar… Last #Thylacine almost certainly not the zoo animal that died in 1936. Most likely wild extinction occurred between 1960s to 1980s.
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🧵Supported by 150 volunteer @ReefLifeSurvey divers, AIMS and park managers, our Australia-wide reef life census showed:
# most (57%) of 1037 species were declining; 43% increasing
# cool water species are disappearing, many now below detectable limits
nature.com/articles/s41586-0…
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The giant creeper Campanile symbolicum.
A living fossil.
Also the only species in its family.
Badly affected by the 2011 heatwave off southwestern Australia, with little population recovery.
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