R. D'Andrea

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Despite the potential for competition to generate equilibrium coexistence of infinitely tightly packed species along a trait axis, prior work has shown that the classical expectation of system-specific limits to the similarity of stably coexisting species is sound. A key reason is that known instances of continuous coexistence are fragile, requiring(More)
The recently proposed tolerance-fecundity trade-off model represents a step forward in the study of seed size diversity in plant communities. However, it uses an oversimplified picture of seed tolerance, with an infinitely sharp threshold: the probability that a seed tolerate a given stress level is either 1 or 0. This invites a revision of the model,(More)
Community ecology lacks the success enjoyed by population genetics to quantify the relative roles played by deterministic and stochastic processes. It has been proposed that clustered patterns of abundance in genotype space provide evidence of selection in microbial communities, since no such clustering would arise in the absence of selection. We critique(More)
We introduce patch models, a computational modeling formalism for multivehicle combat domains, based on spatiotemporal abstraction methods developed in the computer science community. The framework yields models that are expressive enough to accommodate nontrivial controlled vehicle dynamics while being within the representational capabilities of common(More)
The DNA sequence of a chicken genomal fragment containing a histone H2A gene has been determined. It contains extensive 5' and 3' flanking regions and encodes a protein identical in sequence to the histone H2A protein isolated from chicken erythrocytes. In the 5' flanking region, a possible "TATA box" and three possible "cap sites" can be recognised(More)
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