Wade VanderWright 🌊🦈

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Wade VanderWright 🌊🦈

Wade VanderWright 🌊🦈

@WVanderWright

Marine Biologist. PhD Student - Dulvy Lab @E2ocean. Gill Physiology, Metabolism, Population Dynamics.

Vancouver, British Columbia Katılım Mayıs 2016
562 Takip Edilen235 Takipçiler
Wade VanderWright 🌊🦈 retweetledi
Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
Brightspot countries for shark and ray conservation have: 👉 high catch-per-unit-effort 👉 fisheries subsidies that do not promote overfishing 👉 stronger governance science.org/doi/10.1126/sc… #OceanOptimism 17/20
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Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
Bright spots with some science-based fisheries management measure benefiting sharks & rays: 1. USA & Canada 2. NE Atlantic 3. S. Africa 4. Australia & New Zealand #OceanOptimism 🧵15/20
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Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
Researchers highlight troubling dark spots where shark & ray biodiversity is plummeting, w/ 👉 steep declines in RLI 👉 high richness & endemicity: 1. Japan–Taiwan 2. Indonesia to New Guinea 3. India & Bay of Bengal 4. Western Indian Ocean 5. SW Atlantic 6. Galapagos & SE Pacific 7. Gulf of California 🧵14/20
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Wade VanderWright 🌊🦈 retweetledi
Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
#GlobalSharkTrends Since we wrote the paper @SharkColin coded a mesmerizing GIF of the Red List Index for sharks, rays & chimaeras 🧵7/20
GIF
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Wade VanderWright 🌊🦈 retweetledi
Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
Overfishing has halved populations of the chondrichthyan fishes – sharks, rays, and chimaeras – since 1970. Target fisheries and incidental capture (bycatch), in particular, has resulted in over one-third threatened with extinction. #GlobalSharkTrends 🧵4/20 #EndOverfishing #SustainableDevelopmentGoals
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Wade VanderWright 🌊🦈 retweetledi
Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
Okay so today we got to see the BIG tanks @NRF_SAIAB and found the Reef Manta Ray Mobula alfredi; the #hottake was that this was just gills-on-fins... look at the length of those gill slits... #MetabolicMorphology
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Wade VanderWright 🌊🦈 retweetledi
Nicholas Dulvy
Nicholas Dulvy@NickDulvy·
Phew! after 2 weeks working @NRF_SAIAB its a wrap. We measured 25+ #MetabolicMorphology traits from 43 sharks & 240 ray specimens, spanning 60 species, from endemic catsharks, skates & electric rays to pelagic and deepsea sharks. The Coelocanth was discovered in East London by Marjorie Courtenay-Latimer and described here at the South African Institute for Aquatic Biodiversity (SAIAB) in 1938 Thanks to the fantastic support team at SAIAB and @SFUResearch & @NSERC_CRSNG
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Wade VanderWright 🌊🦈 retweetledi
Chris Mull
Chris Mull@Drsharkbrain·
While teleosts have demonstrated increased speciation with sexual selection, the highest rates of speciation were seen in Skates (Rajiformes) and Neotropical Freshwater Rays (Potamotrygonidae) which highlight the colonization of novel habitats.
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Chris Mull
Chris Mull@Drsharkbrain·
Understanding repro mode evolution in sharks and rays we can test different theories about how these traits relate to diversification dynamics (i.e. rates of speciation and extinction): the Viviparity Driven Conflict Hypothesis and the Novel Ecological Opportunity hypothesis.
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Wade VanderWright 🌊🦈 retweetledi
Chris Mull
Chris Mull@Drsharkbrain·
Egg-laying is ancestral and live-bearing and matrotrophy (additional maternal nourishment beyond the initial yolk) have evolved multiple times. While some groups are invariant (all skates lay eggs), groups like the requiem sharks exhibit diverse reproductive modes and habitats
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Wade VanderWright 🌊🦈 retweetledi
Chris Mull
Chris Mull@Drsharkbrain·
The sequence and drivers of the evolution of live-bearing and matrotrophy are fundamental questions in vertebrate macroecology, and sharks and rays with their reproductive diversity (everything from egg-laying to placentas) are an ideal group for addressing these questions.
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Wade VanderWright 🌊🦈
Wade VanderWright 🌊🦈@WVanderWright·
Another way to have more gill area is to add gills and gill slits, as seen in the six- and seven-gill sharks (red dots) which have quite large gill slits considering how deep they occur
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Wade VanderWright 🌊🦈
Wade VanderWright 🌊🦈@WVanderWright·
Also, what about endothermic sharks?…. Well it turns out that they have larger gill slits heights than the ectothermic sharks which is consistent with and expectation that they need greater oxygen uptake to sustain endothermy – see the purple dots
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Wade VanderWright 🌊🦈
Wade VanderWright 🌊🦈@WVanderWright·
P.S. Everytime we talk about this work folks ask… what about thresher sharks?…. Well they are not just swimming with their tails they are also smacking prey with it – see the blue dots and the nearby purple dot youtube.com/watch?v=Mn7NTA…
YouTube video
YouTube
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