A high percentage of accidental species
in forest communities indicates a more stable environment, while species listed as accessory are better adapted to the communities (Bernardi et al.
Bark-dwelling spiders have been classified according to how strongly connected they are to this habitat (Wunderlich 982) as follows: 1) Exclusive bark-dwellers are species that live on or under the bark during all or most part of their life cycle; 2) Facultative bark-dwellers are species that typically, but not exclusively, use this habitat; and 3) Accidental species
are typically from other habitats and use bark habitats by chance or as an alternative.
The last benthic community shows a low affinity and includes accidental species
with la < -0.
Recourse "Unto Mount Olivet" for the speaker is purely imaginative, even if excruciating: "A man so wrung with pains, that all his hair, / His skinne, his garments bloudie be" (lines 9-10) suggests a meditative sharing in Christ's sufferings, but poetic artifice renders sweet that which for another was truly agonizing, just as the accidental species
of a Roman sacrament veil even as they embody their substantial counterpart.
The addition or deletion of a single species can change important properties of an ecosystem, influencing the regulation of energy flow and the cycling of chemicals, Vitousek reports after considering examples of deliberate and accidental species