A Quote by Ernst Mayr
A species is a reproductive community of populations reproductively isolated from others that occupies a specific niche in nature.
Related Quotes
A new species develops if a population which has become geographically isolated from its parental species acquires during this period of isolation characters which promote or guarantee reproductive isolation when the external barriers break down.
I think that my main criticism in that book was directed at the general assumption that adaptation characterizes populations and species, rather than simply the individuals in the populations and species.
The most irrevocable of [natures] laws says that a species cannot occupy a niche that appropriates all resources--there has to be some sharing. Any species that ignores this law winds up destroying its community to support its own expansion.
If new species arise very rapidly in small, peripherally isolated local populations, then the great expectation of insensibly graded fossil sequences is a chimera. A new species does not evolve in the area of its ancestors; it does not arise from the slow transformation of all its forbears.
co-author with Niles Eldridge
If any value is deeply evolutionarily familiar, it is reproductive success. If any value is truly unnatural, if there is one thing that humans (and all other species in nature) are decisively not designed for, it is voluntary childlessness. All living organisms in nature, including humans, are evolutionarily designed to reproduce. Reproductive success is the ultimate end of all biological existence.
The reduced variability of small populations is not always due to accidental gene loss, but sometimes to the fact that the entire population was started by a single pair or by a single fertilized female. These 'founders' of the population carried with them only a very small proportion of the variability of the parent population. This 'founder' principle sometimes explains even the uniformity of rather large populations, particularly if they are well isolated and near the borders of the range of the species.
A species may eat a particular bacterium, phytoplankton, smaller fish, or plant in an area. Lacking a predator, these species/populations will overgrow and alter the area's biology, overwhelming and driving to extinction dozens or hundreds or thousands of other local species.
The whole [scientific] process resembles biological evolution. A problem is like an ecological niche, and a theory is like a gene or a species which is being tested for viability in that niche.
Politicians need a better understanding of global ecology. We need to be freed from our species-specific arrogance. No evidence exists that we are chosen, the unique species for which all the others were made. Nor are we the most important one because we are so numerous, powerful and dangerous.
Politicians need a better understanding of global ecology. We need to be freed from our species-specific arrogance. No evidence exists that we are 'chosen', the unique species for which all the others were made. Nor are we the most important one because we are so numerous, powerful and dangerous.
But we must here state that we should not see anything if there were a vacuum. But this would not be due to some nature hindering species, and resisting it, but because of the lack of a nature suitable for the multiplication of species; for species is a natural thing, and therefore needs a natural medium; but in a vacuum nature does not exist.
The more isolated and disconnected we are, the more shattered and distorted our self-identity. We are not healthy when we are alone. We find ourselves when we connect to others. Without community we don't know who we are... When we live outside of healthy community, we not only lose others. We lose ourselves...Who we understand ourselves to be is dramatically affected for better or worse by those we hold closest to us.
It's a fair guess that at the rate we're destroying habitat, especially but not exclusively in the tropics, we're pushing to extinction about one species every hour. That doesn't count the species whose populations are being reduced so greatly that diversity within the population is essentially gone.
A species consists of a group of populations which replace each other geographically or ecologically and of which the neighboring ones integrate or hybridise wherever they are in contact or which are potentially capable of doing so (with one or more of the populations) in those cases where contact is prevented by geographical or ecological barriers.
We are in niche consumption mode, but 'niche' doesn't mean 'small' anymore. Niche can mean focused, and particularly with the Web, which is a global audience you can have something niche and still get 10 to 15 million views.
We are in niche consumption mode, but 'niche' doesn't mean 'small' anymore. Niche can mean focused, and particularly with the Web, which is a global audience... you can have something niche and still get 10 to 15 million views.
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