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algae affected by temp?
Bill Kirkpatrick wrote in message ...
I'm going to leave this with... For all you said, what you haven't answered is the riddle, other than to say "wrong". Ok, well, maybe we collectively are, that's fine... Well the scientist are not wrong, we can see that if you add nutrients, P or/or N to a lake with 50% or more surface coverage with macrophytes, the lake stays macrophyte dominated. Adding nutrients makes the plants grow faster. If the levels are less than 30-50%, often you will get algal pea soup domination. That's one reason we have such bad aquatic weed problems in Florida. But, if, as you say, higher plants need so very much more of "everything" v. algae, just to survive, and all of that must be in the water at all times, else our higher plants are just dead beyond redemption... then... How is it anyone, ever, controls algae? Shouldn't it simply explode, killing everyone, and everything? There's many ways, not just one way we control algae and it's controlled in nature. Algae is tasty and nutritious and grows back fast so this supports a large herbivore population, wereas there are few aquatic plant herbivores(Grass carp etc). Submersed Plants grow, but it takes them more time to establish. Algae and macrophytes occupy different niches/environments. High O2 level;s in lakes, aquariums seems to have a negative effect likely due to photorespiration to _some_ algae species. In our tanks we remove the algae, start off the tank with loads of plants, we always remove the algae and do water changes etc. Macrophytes main competitive advantage is light. Macrophytes grow fast enough to out pace the the algal colonization. We trim off the older leaves, replant thew tops. Something must be limiting them. You seem to propose nothing, other than the mear physical presence of healthy plants. Surely algae do not inspect their environment, approve the health, state, and quantity, of the higher plants, and give up. Why not? Plants do. Seeds will not grow unless precise environmental conditions exist, the same is true for algae spores. Try and induce green water without NH4, use NO3 for example, then try using NH4, you'll see quickly that algae do respond fast to this. (Aside - some higher plants to emit various biocides. Let's assume our swords do not. You'd be hard pressed to show this. See APD for more on allelopathy, I've made some very strong arguments against this happening. Further, reefs and silk plant tanks are known to exist w/o higher plants at all, yet are also subject to acute, resolvable, algae infections.) Reefs are not the same as planted tanks. There are marine planted tanks, but these are not reef tanks. Not all corals use algae. Silk plant tanks don't have higher lighting(why add more light?) People have gone from no apparent infection, to acute infection, and back. I have, even somewhat routinely on my reef tanks. I keep marine planted tanks, but like the FW plants, if the corals are not feed and kept healthy/ actively growing, the nuisance algae will bloom. We see this commonly with refugium folks, their macro's grow like gangbusters, peter out due to nutrient limitations, go sexual(in response to what? low, not high nutrients) and then afterwards, the bad algae come in. The conditions in marine tanks are more subtle, but many of the same issues still apply. If, as you seem to claim, all higher plants must fail before nutrients can limit the algae, then what IS doing the limiting? See above, there is likely a few things going on. Few researchers have really looked at this in terms of a planted tank, there's no grant money Something is allowing routine reclamation of all these obviously inoculated tanks? (and not everyone is pumping their tank full of anti-biotics, particularly on the reef side.) I feel I have spent enough time and supported my own arguments and assertions, it's now time for you to look into things for yourself and prove that adding PO4 to a planted tank causes algae. I can easily and handily prove that excess PO4 does not cause algae in a planted tank. You need to prove to me that it does. The research is against you, the practical experience is against you, even Paul Sears concedes otherwise about PO4. Just about every contest winner I know has used PO4 or has a lot in their tap water. It is rather easy to prove what something is not, it's tougher to prove what is going on, often it's several things. I'm not saying what precisely it is that causes plant domination, but it does exist and I've given several good plausible nmechanisms for this to occur. There are other mechanisms I have not listed but look around first. Regards, Tom Barr |
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