Patricia Charvet
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patriciacharvet.bsky.social
Patricia Charvet
@patriciacharvet.bsky.social
1.5K followers 340 following 1 posts

Biologist, researcher working with sharks and rays🦈<:>—

Videos
Environmental science 56%
Biology 17%
Posts Replies Media Videos

Reposted by Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
What success looks like (5–10 years)
• Fishing mortality aligned with species’ life histories
• Species-level reporting becomes the norm
• Management completeness rises above critical thresholds
• Shark & ray populations stabilize and recover

Read the paper here: rdcu.be/eZ9n9
Bending back the curve of shark and ray biodiversity loss
Nature Reviews Biodiversity - Global shark and ray populations have declined sharply, driven by expanding fisheries and inequitable gaps in catch, trade and distribution data. This Review assesses...
rdcu.be

Reposted by Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
• 40% of global shark & ray catch comes from low- and middle-income countries
• Small-scale fisheries underpin livelihoods and food security
• Under-resourced management = high biodiversity & social risk
• Reduced fishing mortality reduces extinction & social risk, improving ecosystem functions.

Reposted by Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
Where investment has the highest leverage to bend back biodiversity loss?

Funding that strengthens:
• Species-level catch & trade data
• Compliance and enforcement
• Capacity in national agencies
• Monitoring in small-scale fisheries
→ Directly reduces fishing mortality
Bending back the biodiversity loss curve of sharks and rays. The loss of sharks and rays to date has involved serial depletion of the largest, most evolutionary and functionally distinct species, and the increasing prevalence of smaller-bodied species that have benefited from release from predation.

Reposted by Colin A. Simpfendorfer, Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
We don’t need new frameworks — we need to connect and implement the ones we have.

Fisheries management, trade rules, compliance, and demand must align to reduce fishing mortality at scale.
Implementation is the bottleneck.

@hollieboothie.bsky.social
@sharkcolin.bsky.social
A theory of shark and ray conservation change. Structural drivers of shark and ray decline can be addressed through three types of measures that target trade and demand management, fisheries management, and rehabilitation.

Reposted by Colin A. Simpfendorfer, Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
Decline is not inevitable.

Where fishing mortality has been reduced — through catch limits, retention bans, or spatial protection — shark and ray populations are stabilizing or recovering.

Recoveries documented for wide-ranging and restricted-range species @charlie-huveneers.bsky.social
Green List Status Assessment of the Banded Wobbegong (Orectolobus halei) The recovered (blue) status compared to what the past status might have been without conservation (Conservation Legacy, green) and future status unless management continues (Conservation Dependency, orange).

Reposted by Colin A. Simpfendorfer, Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
Gaps in catch limits, compliance, and enforcement mean fishing mortality stays high even where policies exist.

Where management is complete, risk is lower and recovery is possible.

@hollieboothie.bsky.social
@sharkcolin.bsky.social

Read the paper here: rdcu.be/eZ9n9
Progress and priorities in shark and ray fisheries management. The risk to species owing to incomplete management (‘M-Risk’, part a) can be described by Compliance, one of 19 attributes across four classes for requiem sharks and guitarfishes

Reposted by Colin A. Simpfendorfer, Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
Overfishing is compounded by under-management

Fishing mortality is the primary driver &
management completeness (for guitarfishes & requiem sharks) stands at ~49% globally.

@sammsherman27.bsky.social
@vanderwright.bsky.social
Read the paper here: rdcu.be/eZ9n9
Progress and priorities in shark and ray fisheries management. The risk to species owing to incomplete management (‘M-Risk’, part a) can be described by 19 attributes across four classes for requiem sharks and guitarfishes.

Reposted by Colin A. Simpfendorfer, Patrícia Charvet, Vincent Raoult

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
What’s driving the decline?

The crisis isn’t just fishing — it’s invisible fishing.

Much shark & ray catch is under-reported, aggregated, or mislabeled, masking real mortality & delaying management.

What we don’t measure, we don’t manage.

@cgmull.bsky.social
@nathanpacoureau.bsky.social
Taxonomic differentiation of catch. FAO (United Nations Food and Agricultural Organization) on the percentage of catch reported to the species level worldwide.

Reposted by Colin A. Simpfendorfer, Patrícia Charvet

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
Sharks & rays are sentinels of ocean health.

- Global abundance has been fished down by 65%,
- Now 37.5% of species are threatened,
- The current extinction rate is 25–250 times greater than the background fossil record, with greatest losses in tropical coastal seas. #BiodiversityTargets
Extinction risk and the spatial patterning of shark, ray and chimaera richness, including hotspots of coastal and deepwater richness, for wide-ranging and endemic species.

Reposted by Colin A. Simpfendorfer, Graeme S. Cumming, Trevor A. Branch , and 3 more

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · 2d
New paper out today in @natrevbiodiv.nature.com by the #GlobalSharkTrends team: Bending back the curve of shark & ray biodiversity loss;
Read the paper here: rdcu.be/eZ9n9
@sfu.ca
@sfubiosciences.bsky.social
@earth2ocean.bsky.social
Bending back the biodiversity loss curve of sharks and rays. The loss of sharks and rays to date has involved serial depletion of the largest, most evolutionary and functionally distinct species, and the increasing prevalence of smaller-bodied species that have benefited from release from predation.

Reposted by Patrícia Charvet

marcelaalvarenga.bsky.social
Marcela M. Alvarenga @marcelaalvarenga.bsky.social · Sep 19
✨ In collaboration with an incredible team of Brazilian researchers:
@ingridbunholi.bsky.social @patriciacharvet.bsky.social @rodrigodomingues.bsky.social @manirfeitosa.bsky.social + colleagues

Reposted by Patrícia Charvet

marcelaalvarenga.bsky.social
Marcela M. Alvarenga @marcelaalvarenga.bsky.social · Sep 19
🚨 New paper in Molecular Ecology Resources!
We compiled the most applied rapid DNA/eDNA-based ID tools & primers for #sharks and #rays 🦈
A practical guide to help scientists, managers & enforcement choose the right method for conservation action.
Read here: doi.org/10.1111/1755... #OpenScience #eDNA

Reposted by Patrícia Charvet

jonready.bsky.social
Jonathan Ready @jonready.bsky.social · Aug 22
Now published. Local reference data is essential for detecting species of interest such as these critically endanged sawfishes.
www.sciencedirect.com/science/arti...
Geographical variation in mitogenomes of the largetooth sawfish Pristis pristis: Challenges and perspectives for conservation efforts
Sawfishes (Pristidae) have been severely impacted by coastal development and unregulated fisheries and are considered Critically Endangered by the IUC…
www.sciencedirect.com

Reposted by Patrícia Charvet

jonready.bsky.social
Jonathan Ready @jonready.bsky.social · Feb 27
Local genetic reference sequences can be essential for species specific studies. Applying what worked for a species elsewhere in the world (in this case largetooth sawfish, Pristis pristis) may not work where you are!!! www.biorxiv.org/content/10.1...
Geographical variation in mitogenomes of the largetooth sawfish Pristis pristis: challenges and perspectives for conservation efforts
Sawfishes (Pristidae) have been severely impacted by coastal development and unregulated fisheries and are considered Critically Endangered by the IUCN Red List. Environmental DNA (eDNA) analyses have...
www.biorxiv.org

Reposted by Patrícia Charvet

sharkcolin.bsky.social
Colin Simpfendorfer @sharkcolin.bsky.social · Dec 6
And here is the second one. Status change by the three main ocean habitats of sharks, rays and chimaeras through time.
@nickdulvy.bsky.social @nathanpacoureau.bsky.social @iucnshark.bsky.social @sscmarine.bsky.social
#sharkscience #shark #sharkconservation

Reposted by Ulf Bergström, Patrícia Charvet

sharkcolin.bsky.social
Colin Simpfendorfer @sharkcolin.bsky.social · Dec 6
Yesterday our new #globalsharktrends paper came out in @science.org
@nickdulvy.bsky.social did a great thread on the paper and included some GIFs that we had made but they did not play here on @bsky.app
I'm hoping this now works.
Status change through time...
science.org/doi/10.1126/...

Reposted by Elliott L. Hazen, Joachim Claudet, Gareth J. Williams , and 3 more

nickdulvy.bsky.social
Nick Dulvy @nickdulvy.bsky.social · Dec 5
New #GlobalSharkTrends study published in @science.org reveals #overfishing has more than halved shark & ray populations over the past 50-years causing widespread erosion of ecological function and exceptionally high extinction risk
👉Full article bit.ly/GlobalSharkTrends
🧵1/20
Scalloped hammerhead sharks (Sphyrna lewini) IUCN Critically Endangered © Masayuki Agawa_Ocean Image Bank

Reposted by Andrew Chin, Ana Nuño, Rima W. Jabado , and 1 more

iucnshark.bsky.social
IUCN SSC Shark Specialist Group @iucnshark.bsky.social · Dec 2
BREAKING: The IUCN Species Survival Commission Shark Specialist Group has released a new report on the global conservation status of sharks and their relatives.

portals.iucn.org/library/node...
Cover of the new "global status of sharks, rays, and chimaeras" report

Reposted by Patrícia Charvet

sharkcolin.bsky.social
Colin Simpfendorfer @sharkcolin.bsky.social · Dec 2
The beast is out!
@iucnshark.bsky.social has released a major new report: "The global status of sharks, rays, and chimaeras".
2100+ pages of information from over 350 authors from around the world.
Available for free download: portals.iucn.org/library/node...
#sharkscience
The global status of sharks, rays, and chimaeras | IUCN Library System
portals.iucn.org

Reposted by Patrícia Charvet

iucnshark.bsky.social
IUCN SSC Shark Specialist Group @iucnshark.bsky.social · Dec 2
Here are the latest and most up-to date figures on how many species of sharks and their relatives are threatened. These animals are some of the most threatened vertebrate animals in the world.
Infographic highlighting the threatened status of sharks and their relatives

Reposted by Patrícia Charvet

ananuno.bsky.social
Ana Nuno @ananuno.bsky.social · Dec 2
This is such a fantastic resource amazingly led by Rima Jabado et al.! Happy to have played a very minor part as contributor to the chapter on São Tomé and Príncipe led by @gporrinos.bsky.social. Well done to the 353 contributors from over 110 countries! #OceanOptimism #Conservation
iucnshark.bsky.social IUCN SSC Shark Specialist Group @iucnshark.bsky.social · Dec 2
BREAKING: The IUCN Species Survival Commission Shark Specialist Group has released a new report on the global conservation status of sharks and their relatives.

portals.iucn.org/library/node...
Cover of the new "global status of sharks, rays, and chimaeras" report

Reposted by Patrícia Charvet

iucnshark.bsky.social
IUCN SSC Shark Specialist Group @iucnshark.bsky.social · Dec 2
#WeAreSSC #SpeciesSurvival #ConservationPartners #SSCleaders #ConservationImpact #VolunteerNetwork #SSCPublications #ConservationWorks #shark #ray #chimaera #conservation #marine #science

Reposted by Patrícia Charvet

iucnshark.bsky.social
IUCN SSC Shark Specialist Group @iucnshark.bsky.social · Dec 2
There are chapters for each major global region, and if you are a journalist writing about this report, we have experts from your region standing by to answer your questions. We also have a variety of high-quality images for journalists' use.

Reposted by Peter Stoett, Jamie Woodward, Patrícia Charvet

irishrainforest.bsky.social
Eoghan Daltun 🌍 @irishrainforest.bsky.social · Dec 2
Shifting baseline syndrome explains how we normalise the continual visceration of once unimaginably rich ecosystems.

Rewilding – our minds, lands, and seas – is the solution. 🌏

Reposted by Rima W. Jabado, Patrícia Charvet

iucnshark.bsky.social
IUCN SSC Shark Specialist Group @iucnshark.bsky.social · Nov 27
The IUCN SSC SSG was established to respond to growing awareness and concern of the severe impact of fisheries on shark, ray, and chimaera populations globally. The SSG is recognized as the leading authority on the status of these species, using science to support actions for conservation.

patriciacharvet.bsky.social
Patricia Charvet @patriciacharvet.bsky.social · Nov 19
Let’s keep that increasing!🦈🦈

Reposted by Patrícia Charvet

morphometrich.bsky.social
Dr. Rich B @morphometrich.bsky.social · Nov 18
Made a Paleontology version of this a few years ago. Since we're all sharing...