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Old 05-14-2009, 08:17 PM
Ed Ed is offline
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Default Re: So, you want a reason to not mix species?

Quote:
Originally Posted by Rich Conley View Post
No, it is not.


If anything, there should be slightly less aggression between two males of similar species than between two males of the same species. Yes, there will still be aggression, but theres no reason that it would be MORE than two same species same sex animals. )
This cannot be used as a broad based rule with species that are strongly territorial as the competition for niches and resources can be just as intense between the species as within a species. A reputable source reported about a male O. pumilio repeatedly attaching a D. tinctorius in an attempt to drive it from the tank... this is an example of different species same behaviors, same shape.. (for a good source of peer reviewed data look at that for plethodontid salamanders, there is even direct competition between plethodontids and amybstomids for resources and if the ambystomid is too small to eat the plethodontid, it will bite at the nares in an attempt to damage them inhibiting not only the plethodontid's ability to not only feed but court and reproduce).
When discussing this keep in mind, one of the background drives is on whether or not the species will compete for space with offspring.. there is an evolutionary pressure to discourage competition by species with the same niche requirements (one of the driving forces for speciation is niche specialization...)

This is one of the reasons why in general density within a species enclosure doesn't directly translate to multispecies enclosures..as competition between species with similar body shapes and niche requirements can actually be more intense.


Quote:
Originally Posted by Rich Conley View Post
(unless, of course, rather than 4 leucs in a tank, you're talking 4 leucs and 2 tincs, in which case, increased aggression is more caused by increased population density than any mixing concerns)
If one uses a species that doesn't have the same shape and/or behaviors then the animal is going to be ignored as it will be "viewed" as being a non-competitor for the same resources. This is why in multispecies enclosures, there isn't a problem with a small hylid for example.....

Unless you are really have a lot of experience and design ability I do not suggest housing different dendrobatids together...

Ed
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