Evolutionary Theory: Mathematical and Conceptual Foundations, by , tries to not use any more math than is needed. This only holds off the PDEs until the case of multiple alleles at one locus, p. 24.
Theoretical Ecosystem Ecology: Understanding Element Cycles, and , is PDE-free all the way to a concept of substrate quality, page 37. Those aren't bad, actually; the persnickety equations are often just ODEs.
Theoretical... compares its results to quite a lot of empiric data, considering that it's a short book on mathematics. Also, there's some odd, odd Nordic poetry (in translation) and some worked exercises; very useful, and I must get back to it after this quarter's class in PDEs.
Somewhere else asserts nitrogen:food-energy:water::carbon:fossil-fuel-energy:air. In the soil, it's more like potential and ?metabolic? energy, but they're still wonderfully linked.
ISBN: 0521580226 (Theoretical...)
LCCN: QH 344 A35 1996 (Theoretical...)
ISBN: 0878937021 (Evolutionary...)
LCCN: QH 366.2 R523 2004 (Evolutionary...)
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