| Abstract: | I assessed the population dynamics of fathead minnows (Pimephales promelas) in prairie wetlands and developed a bioenergetics model to estimate their production and prey consumption. I sampled populations in four wetlands weekly from late May through June and biweekly during July and August using a Kushlan 1-m2 throw trap. I imposed commercial harvest on two populations; the other two populations served as controls. Weekly population density estimates ranged from 52 000 to 356 000??ha-1 during early June and from 5400 to 19 700??ha-1 in late August. Simulated commercial harvest did not influence population density, mortality rates, or size of fathead minnows. Standing stock biomass differed among wetlands sampled, ranging from 144 to 482 kg??ha-1 in early June and from 1 to 33 kg??ha-1 during late August. However, differences were attributed to differential predation pressure rather than harvest pressure. Net production during the period ranged from 71.5 to 202.7 kg??ha-1. Daily net production was greatest in early June (2.6-13.5 kg??ha-1??day-1) and then declined during July and August (0.1-1.2 kg??ha-1??day-1). Total mass of prey consumed by fathead minnows ranged from 332.7-1104.8 kg??ha-1 among wetlands. |
| Genre: | Article |
| ProdID: | 70020456 |
| Citation Author: | Duffy, W. G. |
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| Citation End Page: | 27 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Canadian Journal of Fisheries and Aquatic Sciences |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Population dynamics, production, and prey consumption of fathead minnows (Pimephales promelas) in prairie wetlands: A bioenergetics approach; 1998; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Duffy, W. G. |
| Citation Start Page: | 15 |
| Citation Volume: | 55 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Population dynamics, production, and prey consumption of fathead minnows (Pimephales promelas) in prairie wetlands: A bioenergetics approach; 1998; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Duffy, W. G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
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