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Generally, species that use a wide range of resources or tolerate a variety of abiotic conditions can establish more populations in more places than comparable species with relatively narrow niches (Brown, 1995; Cook and Quinn, 1995).Differences in the ability of species to distribute themselves across space have distinct consequences for the structure of communities.
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This evolutionary progression seems to be clearly demonstrated in that certain kinds of creatures in the upper layers are rarely if ever seen in lower layers.
Many of the layers also show a certain specialization.
Therefore, the best thing to do in science is to continually question and test previous hypothesis and theories to see if they continue to hold up under scrutiny.
So, let's take another look at the available evidence and see if any other possibilities present themselves.
Sites that encompass a greater area tend to have more species (Rosenzweig, 1995).
This is because large areas include a subset of species not found elsewhere. [These features are consistent with the hypothesis of] "isolated habitat 'islands'." Using this line of reasoning, one might reasonable hypothesize that trilobites appear in the fossil record before crabs and lobsters at least party because of the relative abundance of trilobites compared to crabs and lobsters.
Therefore, the nested subset pattern of species distribution in space is thought to reflect the gradient in abundance among species (Gaston, 1996; Leitner and Rosenzweig, 1997; Maurer, 1999). This hypothesis is at least plausible given the author's conclusion that, "Species identities and their relative abundances are non-random properties of communities that persist over long periods of ecological time and across geographic space.
This is consistent with species abundance contributing heavily to evolutionary patterns." After all, "It's very rare to find fossils of lobsters" ( Link ).
The scientific method is all about testing and retesting theories since no theory is ever proven by science.Tags: Adult Dating, affair dating, sex dating