Re: NANFA-L-- stonerollers

anutej at loxinfo.co.th
Thu, 06 Oct 2005 00:41:11 +0700

Any work on floodplain fishes in NA? Here often the most abundant
cyprinids are ones that migrate between floodplains [and associated
pond/pool/canal] and main river between seasons.

Tony

Dave Neely wrote:
>
> Hey Tony,
>
> Good to hear from you.
>
> >What morphological and meristical difference between them?
>
> I'm currently away from my notes, but off the top of my head pullum has
> smaller scales (R.D. Ross noticed this back in the early 1960s and mapped
> fine-scale distribution of the two in NY and PA), michauxi has a different
> tuberculation pattern and pharyngeal tooth formula (usually), and plumbeum
> has bright red-orange fins. It ain't rocket science. Analyses of some of the
> others are still in the works.
>
> >BTW wondering what is the most numerous cyprinid in NA?
>
> Tough question... to my knowledge, no one has attempted a quantitative
> ranking of fish abundance across the US.
>
> The Maryland Biological Stream Survey performed a quantitative study of 955
> randomly selected Maryland streams between 1995-1997. This study identified
> blacknose dace as the most abundant cyprinid (n=64631), followed by creek
> chub (n=19685), rosyside dace (n=17205), longnose dace (n=15549), bluntnose
> minnow (n=12920), and central stoneroller (n=12069). This is probably
> consistent with other areas of the mid-Atlantic region. It is interesting to
> note that numerically dominant taxa primarily occupy 1st and 2nd order
> headwater streams. While it is dangerous and difficult to extrapolate from
> this data set to the entirety of North America, one could make a case that
> given the widespread nature of creek chubs and the numerical dominance of
> headwater habitats, they might beat out other minnows that are more abundant
> in larger stream channels. That said, it's a wild guess - and given the
> sheer abundance of stonerollers in the central US, who knows.
>
> cheers,
> Dave
> --
> Temporarily with no streams between me and the Pacific...
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