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.
| 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 |
| Google Analytic Metrics | Metrics page |