Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions
Southwestern Naturalist
By: Michael J. Horn, Paul C. Marsh, Gordon Mueller, and Tom Burke
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Abstract
High larval mortality has plagued efforts to raise razorback suckers (Xyrauchen texanus) in a Lake Mohave, Arizona-Nevada backwater. Observations indicate odonate nymph densities may be high enough to impact larval survival. In laboratory tests conducted in aquaria, damselfly (Coenagrionidae: Enallagma sp.) and dragonfly (Libellulidae: Tramea sp.) nymphs consumed 81% and 76% respectively of 11.8 ± 0.7 mm total length larval razorbacks in 7 days compared to 12% mortality in controls. Larger razorback larvae (14 to 15 mm TL) were less susceptible than smaller fish, showing 53% mortality versus 18% in controls. Extensive growth of sago pondweed (Potamogeton pectinatus) may exacerbate predation effects in the backwater, by allowing odonates access to more of the water column.
Suggested Citation
Horn, M.J., Marsh, P.C., Mueller, G., and Burke, T., 1994, Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions: Southwestern Naturalist, v. 39, no. 4, p. 371-374.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions |
| Series title | Southwestern Naturalist |
| Volume | 39 |
| Issue | 4 |
| Year Published | 1994 |
| Language | English |
| Publisher | Southwestern Association of Naturalists |
| Publisher location | Dallas, TX |
| Description | 4 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | The Southwestern Naturalist |
| First page | 371 |
| Last page | 374 |