A recent graduate of Darrin Hulsey's lab http://www.bio.utk.edu/hulseylab/ at UT just published a paper that links pelagic larval drift duration with extinction risk. It's really great that we have groups like Conservation Fisheries Inc. that gather really important life history characters like this so that we can do analyses like these. It would be great if those keeping and breeding darters and other North American native fishes would keep logs of larval development and be able to publish them so that we, or others, can use them in future analyses. American Currents and Southeastern Fishes Council Proceedings are great outlets for those!
http://rsbl.royalsoc...130672.abstract
Extinction risk in darters!
Started by
Guest_bpkeck_*
, Nov 15 2013 10:28 PM
7 replies to this topic
#2
Guest_FirstChAoS_*
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Posted 16 November 2013 - 02:21 AM
I skimmed the abstract (not sure if their is a way to vote the full article) and it got me thinking. I heard larval fish are more likely to drift with the current. Maybe that is why those with short larval stage are more extinction prone, they spread out less thus are more likely to be in a limited range. Makes me wonder if widespread darters (rainbow, tesselate, swamp) have long larval durations.
#3
Guest_fundulus_*
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Posted 16 November 2013 - 10:28 AM
The findings of the article are just the opposite, species with little or no larval drift face less extinction threat. Since most darters live in flowing waters, longer drift means your larvae may be swept out of good habitat which is generally limited for darters. It's an opposite problem to that faced by marine species who usually apparently benefit from long larval drift.
#4
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Posted 16 November 2013 - 02:38 PM
The findings of the article are just the opposite, species with little or no larval drift face less extinction threat. Since most darters live in flowing waters, longer drift means your larvae may be swept out of good habitat which is generally limited for darters. It's an opposite problem to that faced by marine species who usually apparently benefit from long larval drift.
I wonder if longer drift time is more prevalent in more generalist darters whose ability to handle varied current is greater? Not every darter is a riffle specialist, so maybe long drifters are those more able to handle inconvenient habitat. I got to find a way to look over the article and see.
#6
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Posted 17 November 2013 - 07:49 PM
I suppose it could also be interpreted that larval fish stages are particularly sensitive to begin with, and those species who have the longest durations for theirs would logically be prone to environmental harm/a harmful event for a longer period.
#8
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Posted 05 February 2014 - 09:40 AM
That bypass seems to be under construction. It will, of course, shred all sorts of land and habitats. But it doesn't seem to go through Turkey Creek, or through sensitive parts of the Highway 75 corridor with various species.
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