01331nas a2200145 4500008004100000245012900041210006900170300001200239490000700251520082600258100001601084700001801100700001701118856005001135 2014 eng d00aAlternative spawning strategy and temperature for larval emergence of longfin dace (Agosia chrysogaster) in stream mesocosms0 aAlternative spawning strategy and temperature for larval emergen a277-2800 v593 a

To determine if the strategy of spawning in saucer-like depressions is obligate or facultative for longfin dace (Agosia chrysogaster), we collected adults from four sites in the upper Gila River (southwestern New Mexico), stocked them in separate outdoor stream-mesocosms lined with cobble substrate, and made daily observations for the presence of saucer-nests and hatched larvae. Larvae were observed from three of the four mesocosms and emerged at temperatures ranging from 19.2–24.0°C. The absence of saucer-nests in all mesocosms throughout the study indicates that longfin dace can spawn over cobble substrate and have larvae hatch successfully, suggesting that longfin dace can use an alternate spawning strategy when sand substrate is not available for construction of saucer-nests.

1 aTroia, M.J.1 aWhitney, J.E.1 aGido, K., B. uhttp://www.bioone.org/doi/10.1894/N03-MP-09.1