The effect of flooding on wild rice, Zizania aquatica L.

Pip, Eva; Stepaniuk, Jeffray Roy

doi:10.1016/0304-3770(88)90121-0

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…In Lac La Croix, however, viable stands of wild rice were observed in wetlands adjacent to those sampled, and the species seems to be locally abundant elsewhere in the lake. Northern wild rice does not grow well in areas with wide waterlevel fluctuations (Nichols 1975) and is intolerant of both low water levels and flooding (Thomas and Stewart 1969;Pip and Stepaniuk 1988). Low water levels cause seeds to desiccate, and rising water levels force too much energy to be directed into shoot elongation.…”

Section: Results and Discussion Floristicsmentioning

confidence: 99%

Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota

Wilcox¹,

Meeker²

1991

Can. J. Bot.

115

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1991. Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota. Can. J. Bot. 69: 1542-1551. The effects of water-level regulation on aquatic macrophyte communities were investigated by comparing two regulated lakes in northern Minnesota with a nearby unregulated lake. Natural annual fluctuations of about 1.8 m were replaced with fluctuations of 1.1 m and 2.7 m in the regulated lakes, and the timing of water-level changes was also altered. Quadrats were sampled along transects that followed depth contours representing different plant habitats in the unregulated lake. Ordinations showed that the macrophyte communities at all sampled depths of the regulated lakes differed from those in the unregulated lake. The unregulated lake supported structurally diverse plant communities at all depths. In the lake with reduced fluctuations, only four taxa were present along transects that were never dewatered; all were erect aquatics that extended through the entire water column. In the lake with increased fluctuations, rosette and mat-forming species dominated transects where drawdown occurred in early winter and disturbance resulted from ice formation in the sediments. The natural hydrologic regime at the unregulated lake resulted in intermediate disturbance and high diversity. There was either too little or too much disturbance from water-level fluctuations in the regulated lakes, both resulting in reduced structural diversity. ., et MEEKER, J. E. 1991. Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota. Can. J. Bot. 69 : 1542-1551. En comparant deux lacs h niveau contr6lt avec un lac voisin non-contr61t dans le nord du Minnesota, les auteurs ont ttudit les effets du niveau de I'eau sur les comrnunautts de macrophytes aquatiques. Des fluctuations annuelles d'environ 1,8 m font place h des fluctuations de 1,l m et de 2,7 m dans les lacs i niveau contr6lt et la chronologie des variations est tgalement modifite.Les auteurs ont tchantillonnt des quadrats le long de transects qui suivent les courbes de niveau, reprtsentant difftrents habitats du lac non-contr6lt. Les ordinations font voir que les communautts de macrophytes, a toutes les profondeurs tchantillonntes dans le lac non-contr616, different de celles des lacs contr6lts. Le lac non-contr61ts comporte des communautts structurellement diverses h toutes les profondeurs. Dans le lac montrant des fluctuations rtduites, seulement quatre taxons sont presents le long des transects oh I'eau n'est jamais absente, i.e., toutes les plantes aquatiques dresstes qui s'ttendent sur toute la colonne d'eau. Dans le lac oh la fluctuation est augmentte, les espkces qui foment des rosettes et des coussins dominent les transects oh l'absence d'eau se fait au dtbut de l'hiver et le derangement provient de la formation de glace dans les stdirnents. Le regime hydrologique naturel, dans le lac non-contr61e, s'accompagne de dtrangernents intermtdiaires et d'une forte diversitt. Les fluctuations qui ont lieu da...

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Section: Results and Discussion Floristicsmentioning

confidence: 99%

Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota

Wilcox¹,

Meeker²

1991

Can. J. Bot.

115

View full text Add to dashboard Cite

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“…For instance, the indispensable value of freshwater is increasingly appreciated as northerners witness how lentic and lotic environments respond to precarious ways in which watersheds are being exploited. Hydro-electric development has had extreme adverse impacts across Manitoba, including changes in hydrology, flooding, erosion, concentrations of methylmercury, permafrost [18] [19] and unique concerns regarding human health [20].…”

Section: Introductionmentioning

confidence: 99%

Embedded Place-Responsive Learning, Participatory Video and Scholastic Achievement in Northern Manitoba Adult Environmental Education

Stepaniuk¹

2019

JHRSS

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Academic performance is a challenge confronting many postsecondary students in Northern Manitoba. As such, this study explores the role of situated (field-based) learning and participatory video in facilitating scholastic achievement relating to local freshwater availability and mindfulness. First-year students (n = 97) enrolled at the University College of the North in The Pas were randomly assigned to four adult education approaches containing identical subject matter. Student performance was assessed using outcomes of quantitative testing that focused on either foundational concepts or applied skills. Empirical data were examined using ordered multinomial logistic regression and explored cursorily in relation to unsolicited qualitative statements arising from in-stream participatory video and digitally-captured post-test interviews for each enrollee. Non-conventional lesson interaction inclusive of a modified participatory video approach significantly (p = 0.003) increased quantitative test score means by 26%, raised applied skill scores by one grade level (12%) and significantly (p = 0.07) improved concept understanding between five and 20%. Despite benefits, northern self-declared Aboriginal students still had lower (−11%) test scores on average. Importantly, there was less of a difference academically between non-and self-declared Aboriginal student test scores when situated learning and participatory video use were compared to didactic delivery alone. By identifying non-conventional strategies for improvement in environmental education, tertiary level institutions are presented another option for increasing academic performance ideally mitigating high attrition rates that continue to plague postsecondary education in Northern Manitoba; and for that matter, Canada.

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“…Changes in water levels, including flooding, result in substantial changes in wild rice yields (Dukerschein and Langrehr, 2000;Stevenson and Lee, 1987), such as total crop loss (Vennum, 1988;Pip and Stepaniuk, 1988). Wild rice grows best at shallow to moderate depths (1 to 3 feet [ft]) in areas containing soft, organic bottom sediments or clay to sandy loams, with steady water levels and clear water (1854Treaty Authority, 2005.…”

Section: Introductionmentioning

confidence: 99%

Assessment of aquifer properties, evapotranspiration, and the effects of ditching in the Stoney Brook watershed, Fond du Lac Reservation, Minnesota, 2006-9

The effect of flooding on wild rice, Zizania aquatica L.

Cited by 9 publications

References 6 publications

Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota

Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota

Embedded Place-Responsive Learning, Participatory Video and Scholastic Achievement in Northern Manitoba Adult Environmental Education

Assessment of aquifer properties, evapotranspiration, and the effects of ditching in the Stoney Brook watershed, Fond du Lac Reservation, Minnesota, 2006-9

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