Hofstra, D.E. and Clayton, J.S. and Champion, P.D. and Green, J.D. (1999) Distribution and Density of Vegetative Hydrilla Propagules in the Sediments of Two New Zealand Lakes. Journal of Aquatic Plant Management, 37, pp. 41-44.
Abstract
The distribution and density of hydrilla (Hydrilla verticillata (L.f.)Royle) turions and tubers in two New Zealand lakes were assessed by sampling cores of sediment from Lakes Tutira and Waikapiro each year from 1994 to 1997. Turion and tuber density differed with water depth, with maximum numbers of tubers and turions found in the 1-2 m and 1.5-4m water depth ranges respectively. A high turion to tuber ratio was observed, with turions accounting for over 80% of propagules. The relatively low numbers of turions and tubers compared with other reports, and the distribution of most tubers within the shallow water is likely to be associated with black swan grazing (Cygnus atratus Latham), with maintains a canopy of hydrilla consistently 1 m below the water surface.
| Item Type: | Article |
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| Title: | Distribution and Density of Vegetative Hydrilla Propagules in the Sediments of Two New Zealand Lakes |
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| Personal Creator/Author: | | Creators | Email |
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| Hofstra, D.E. | | | Clayton, J.S. | | | Champion, P.D. | | | Green, J.D. | |
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| Refereed: | Yes |
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| Journal or Publication Title: | Journal of Aquatic Plant Management |
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| Volume: | 37 |
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| Page Range: | pp. 41-44 |
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| Date: | 1999 |
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| Latitude: | -39.13 |
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| Longitude: | 176.54 |
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| Issuing Agency: | Aquatic Plant Management Society, Inc. |
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| Uncontrolled Keywords: | turion; tuber; sediment cores, Hydrilla verticillata; Lake Tutira, New Zealand; Lake Waikapiro, New Zealand; black swan foraging |
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| Subjects: | Ecology
Biology |
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| Item ID: | 1759 |
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| Depositing User: | Natalie Wiest |
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| Date Deposited: | 24 Nov 2008 22:23 |
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| Last Modified: | 29 Sep 2011 22:04 |
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| URI: | http://aquaticcommons.org/id/eprint/1759 |
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