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#extinction

3 Beiträge3 Beteiligte0 Beiträge heute
Wen

I am not a fish eater, but even so this must worry people? Does anyone remember the Passenger Pigeon?

Scientists have uncovered genomic evidence that intensive fishing has driven rapid evolutionary changes that have contributed to these fish roughly halving in average body length since the 1990s.

theguardian.com/environment/20

The Guardian · Overfishing has caused cod to halve in body size since 1990s, study findsVon Hannah Devlin
#OverFishing#Oceans#EvolutionInAction
JuneSim63

The latest State of the World’s Birds report found nearly half of the planet’s bird species are in decline. Habitat loss, logging, invasive species, exploitation of natural resources and climate breakdown were highlighted as the main threats.

#Birds #Extinction #Biodiversity #Environment #Nature

‘Extinction crisis’ could see 500 bird species vanish within a century – report | Birds | The Guardian
theguardian.com/environment/20

The Guardian · ‘Extinction crisis’ could see 500 bird species vanish within a century – reportVon Phoebe Weston
Antwortete im Thread
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DoomsdaysCW

So, the waters off the Maine coast have been warming up (it was very warm when I last waded in the waters in May). Seems
Karenia mikimotoi has appeared here as well. I expect to see it return with warming waters... Also, this article claims it's less toxic that Red Tide (a cousin) -- but from what I just read in the ABC News article, I would disagree with that! @anne_twain @Tooden

From WHOI:

"Karenia mikimotoi

- Globally distributed, can cause mass die-offs of shellfish, crustaceans, echinoderms and fish
- Karenia mikimotoi produces several toxic compounds, blooms can also lead to anoxic conditions
- First bloom in Maine occurred in 2017, with a second bloom in 2019
- Karenia mikimotoi is also found in Massachusetts waters

"What is Karenia mikimotoi?

"In recent years, the genus Karenia has made the news in the United States as a result of the massive #RedTides caused by #KareniaBrevis [That's the one I know about]. These blooms have caused widespread fish and wildlife mortalities and impacted public health in Florida leading to significantly disrupted tourism and fisheries industries which have cost local economies millions of dollars in damages on an almost annual basis.

"Compared to this notorious HAB species, its sister species, Karenia mikimotoi, is less toxic [!!! Ummmm....] but more globally widespread with blooms reported in Ireland, Norway, India, Japan, Korea Australia, South Africa, Alaska, Texas, and the east coast of the U.S. The blooms of this species can stretch many kilometers, persist for multiple months, and reach concentrations of several million algal cells per liter.

"There have not been confirmed reports of direct impacts to human health by #KareniaMikimotoi, but blooms of this species can cause large-scale mortality events of marine fauna such as shellfish, echinoderms, crustaceans, and fish. Karenia mikimotoi has been shown to produce several toxic compounds as well as reactive oxygen species, but toxicity is highly variable by strain and the factors contributing to mortality events are still not entirely understood. Although overall concentrations of toxins in K. mikimotoi appear to be relatively low, there is evidence that their effect may be enhanced when the cells come into direct contact with fish gills. Anoxic conditions can also occur when K. mikimotoi cells die in large numbers and subsequent breakdown by bacteria deplete oxygen in the surrounding waters. These anoxic events have also contributed to die-offs."

What is the history of Karenia in the Northeast?

"Karenia mikimotoi was first isolated from a coastal lagoon near Woods Hole, MA in 1957 and classified at that time as Gyrodinium aureolum. Since this time, large scale blooms of K. mikimotoi appear to be an emerging problem in New England, with the first occurrence in Maine reported in August, 2017. This bloom was concentrated in the Fore River, Portland Harbor, and parts of the Harpswell coastal waters, and coincided with a die-off of softshell clams in Brunswick, ME. This mortality event cost fishermen $250,000, but a direct causal link between the bloom and shellfish mortality was not established. In August 2019 another bloom occurred in Casco Bay, with no mortalities recorded. Karenia mikimotoi is periodically found in Massachusetts waters, usually in the summer and early fall."

northeasthab.whoi.edu/habs/kar

#AlgalBloom #HABs #ToxicAlgae
#Climate #OceanTemperature
#Extinction #ClimateCatastrophe
#ELE #ExtinctionLevelEvent

Northeast HABKarenia mikimotoi - Northeast HABKarenia mikimotoi - Photo by FWC Fish and Wildlife Research Karenia mikimotoi Globally distributed, can cause mass die-offs of shellfish, crustaceans, echinoderms and fish Karenia mikimotoi produces several toxic compounds, blooms can also lead to anoxic conditions First bloom in Maine occurred in 2017, with a second bloom in 2019 Karenia mikimotoi is…
Antwortete im Thread
DoomsdaysCW

"Many people living in or near impacted areas told the ABC they felt they had been left in the dark by authorities.

"While state government bodies including SA Health, the Department of Primary Industries and Regions, South Australia (PIRSA) and the EPA have issued information on their websites and through the media, a lack of information in the days and weeks after the bloom prompted a movement of citizen scientists to collect their own samples and share their findings online."

@anne_twain @Tooden

abc.net.au/news/2025-05-24/sa-

#Australia #algalBloom #ToxicAlgae #OceansAreLife
#Climate #OceanTemperature
#Extinction #ClimateCatastrophe
#ELE #ExtinctionLevelEvent #KareniaMikimotoi

ABC News · An ecological disaster has been unfolding on Australia's coastVon Jessica Haynes
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Petra van Cronenburg

The decline of insects and pollinators is catastrophically huge. Did you know that you can do something for insects even with only a balcon or very small garden? If all try it ... Some small, easy to start steps that could change your behaviour: theguardian.com/environment/20

The Guardian · Insects are dying: here are 25 easy and effective ways you can help protect themVon Tess McClure
#insects#decline#biodiversity
Lukas VFN 🇪🇺

Fish #biofluorescence has evolved more than 100x in 112 million years phys.org/news/2025-06-fish-bio

Marine fishes exhibit exceptional variation in biofluorescent emission spectra journals.plos.org/plosone/arti & Repeated and widespread #evolution of #biofluorescence in marine fishes nature.com/articles/s41467-025 by Emily Carr et al.

"#fish that live in or around #CoralReefs evolve biofluorescence at about 10 times the rate of non-reef species, with an increase following the Cretaceous-Paleogene #extinction"

Martin Rundkvist

Living things on Earth always bounce back after a mass extinction, re-speciate and re-populate. It will take all of human ingenuity to make sure that any of us are still around after the ongoing mass extinction that we have caused. We started this way back in the late Ice Age and it has only accelerated since, prominently when we invented agriculture and then industrialism. We didn't know better back then.

#environment#climate#extinction
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