Application of these data to Cathaymyrus (Cambrian period of China) and Metaspriggina (Cambrian period of Canada) highlights the difficulties: these fossils cannot be placed reliably in the chordate or vertebrate stem because they could represent the decayed remains of any non-biomineralized, total-group chordate. The taphonomic loss of synapomorphies and relatively higher preservation potential of chordate plesiomorphies will thus result in bias towards wrongly placing fossils on the chordate stem. Their results indicate that some of the earliest fossils from our part of the tree of life may have been more complex than has previously been thought.įrom the abstract : The experimental decay of amphioxus and ammocoetes show that loss of chordate characters during decay is non-random: the more phylogenetically informative are the most labile, whereas plesiomorphic characters are decay resistant. Palaeontologists have discovered that studying rotting fish sheds new light on our earliest ancestry.The researchers devised a new method for extracting information from 500 million year old fossils - they studied the way fish decompose to gain a clearer picture of how our ancient fish-like ancestors would have looked. Colors are caused by interference between the experimental equipment and the light illuminating the specimens. A sequence of images showing how the characteristic features of the body of amphioxus, a close living relative of vertebrates, change during decay. One of these days, I'll figure them both out.Credit: Mark Purnell, Rob Sansom, Sarah Gabbott, University of Leicester These are three rotting heads. They seem to both be interested in similar things. I quit doing that, and have been lucky enough to catch a few, while focusing more on wipers. I spent about 2 seasons, trolling and focused on them, and ZERO boated. ![]() They are in there, but those that know, don't really want it to be public knowledge. ![]() Getting tips on walleye on this lake, is kind of rough. The lakes that they survey, they are pretty spot on, from what I have read. Many of their maps are drawn from public records, and not from their own survey boats. That said, Lowrance is fishing focused, and like Mako said, it is still off. Not to talk down on Magellan, but I think their core market is hiking and more land based use. You might want to talk to Magellan and see if they have any map updates. I complained to the company, and they sent me the 2008 model, and worked great (some things still a bit off, but not too bad). The 2007 model, I think, of Navionics map had the entire lake shifted about 50 feet to the South. last year 40 additional tons of rubble for Rock Reefs were installed near the Old 422 Launch and 50 Crib Structures were added as a result of the partnership with these clubs. In recent years Butler Basscasters and Three Rivers Musky have been donating funds that match park funding to add to the amount of structures placed. Looking at the map you will see thousands of structures have been placed since the 1980's. A structure map for Lake Arthur is available at. Moraine is not placing any new structures: Fact: Artificial Fish Habitat Structure are critical to the fishery - The park places artificial structures every year to make up for the natural loss of structure in this man made reservoir. Keep in mind spraying accounts for approx 21 acres out of 3,225Ģ. Spray is injected underwater using an airboat and clings to the target plants and does not drift. If the areas listed above were not treated, access would be difficult or impossible, and the beach areas would be unsafe for visitors. There have been many "banner" years at Lake Arthur since the onset of spraying. Any attempt to try to tie recent declines in Musky populations to weed spraying is unscientific for this reason. DCNR/Moraine sprays large areas of the lake to kill weedbeds for sailboats: Fact: DCNR/Moraine State Park has been treating weeds at Launch areas/Swim Beaches/Cabin Docks/Marinas ONLY since the 1970's - Treating weeds at these areas in not a "new" thing. Listed below are a few answers to misconceptions I am hearing at the Park Office relating to Pittsburgh Post Gazette Article from October 9th ġ.
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