Effects of temperature and photoperiod on lure display and glochidial release in a freshwater mussel

  • Authors: Gascho-Landis, Andrew M.; Mosley, Tyler L.; Haag, Wendell R.; Stoeckel, James A.
  • Publication Year: 2012
  • Publication Series: Scientific Journal (JRNL)
  • Source: Freshwater Science 31:775-786.

Abstract

Freshwater mussels use an array of strategies to transfer their parasitic larvae (glochidia) to fish hosts. We examined the effects of temperature, photoperiod, and female gravidity on mantle lure display and conglutinate release by Ligumia subrostrata (Say, 1831) in 2 laboratory experiments. In the 1st experiment, we examined the use of these strategies in 4 temperature treatments (5, 15, 25, 35°C) and 3 photoperiods (10:14, 12:12, and 14:10 h light: dark). In the 2nd experiment, we observed infection strategies under ambient conditions with flow-through pond water. Water temperature appeared to be the primary cue governing use of these strategies. Lure display occurred over a protracted period, but the highest display frequency occurred between ,11 and 20°C. Lure display declined rapidly above this range and ceased altogether .28°C. Release of conglutinates increased coincident with the decrease in lure display but, at ambient temperatures, occurred over a protracted period similar in duration to lure display. Females that were not gravid at the beginning of the experiment did not display lures, and gravid females whose gills were flushed of glochidia displayed for only a short period during which frequency of display was much lower than gravid individuals. Ligumia subrostrata exhibits a temperature-mediated switch between alternate host strategies. We present evidence that lure display is a primary strategy for host infection and conglutinate release is a secondary, bet-hedging strategy to reduce wastage of glochidia that ultimately must be cleared from the gills at the end of the reproductive season.

  • Citation: Gascho-Landis, Andrew M.; Mosley, Tyler L.; Haag, Wendell R.; Stoeckel, James A. 2012. Effects of temperature and photoperiod on lure display and glochidial release in a freshwater mussel. Freshwater Science 31:775-786.
  • Keywords: life-history strategies, parasites, conglutinates, Unionidae, Ligumia subrostrata, host infection, thermal regime
  • Posted Date: September 24, 2012
  • Modified Date: September 25, 2012
  • Print Publications Are No Longer Available

    In an ongoing effort to be fiscally responsible, the Southern Research Station (SRS) will no longer produce and distribute hard copies of our publications. Many SRS publications are available at cost via the Government Printing Office (GPO). Electronic versions of publications may be downloaded, printed, and distributed.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.