Yields of Propagules of Certain Aquatic Plants I

Yeo, R. R.

doi:10.2307/4040939

Cited by 24 publications

(8 citation statements)

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“…The data indicate that the macrofossil record both over‐ and under‐represents some taxa. C. truncata , an annual species (Barry & Wade, 1986) chiefly relying on seed production for its propagation and maintenance, and Z. palustris , a prolific seed producer (Yeo, 1966), appear to be over‐represented in the sediment record. Z. palustris , in particular, has been shown to be over‐represented by seeds (Davis, 1985) and may be found even where its abundance is extremely low.…”

Section: Discussionmentioning

confidence: 99%

A 250 year comparison of historical, macrofossil and pollen records of aquatic plants in a shallow lake

et al. 2005

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1. Sedimentary remains of aquatic plants, both vegetative (turions, leaves, spines) and reproductive (fruits, seeds, pollen), may provide a record of temporal changes in the submerged vegetation of lakes. An independent assessment of the degree to which these remains reflect past floristic change is, however, rarely possible. 2. By exploiting an extensive series of historical plant records for a small shallow lake we compare plant macrofossil (three cores) and pollen (one core) profiles with the documented sequence of submerged vegetation change since c. 1750 AD. The data set is based on 146 site visits with 658 observations including 42 taxa classified as aquatic, spanning 250 years.3. Approximately 40% of the historically recorded aquatic taxa were represented by macro-remains. In general macrofossils underestimated past species diversity, with pondweeds (three of eight historically recorded Potamogeton species were found) particularly poorly represented. Nonetheless, several taxa not reported from historical surveys (e.g. Myriophyllum alterniflorum and Characeae) were present in the sediment record. 4. The pollen record revealed taxa which left no macro-remains (e.g. Littorella uniflora), and the macrofossil record provided improved taxonomic resolution for some taxa (e.g. Potamogeton) and a more reliable record of persistence, appearance and loss of others (e.g. Myriophyllum spp. and Nymphaeaceae). 5. Detrended correspondence analysis indicated that changes in the community composition evidenced by the palaeolimnological and historical records were synchronous and of a similar magnitude. Both records pointed to a major change at around 1800, with the historical record suggesting a more abrupt change than the sedimentary data. There was good agreement on a subsequent change c. 1930. 6. The palaeolimnological data did not provide a complete inventory of historically recorded species. Nevertheless, these results suggest that combined macrofossil and pollen records provide a reliable indication of temporal change in the dominant components of the submerged and floating-leaved aquatic vegetation of shallow lakes. As such palaeolimnology may provide a useful tool for establishing community dynamics and successions of plants over decadal to centennial timescales.

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Section: Discussionmentioning

confidence: 99%

A 250 year comparison of historical, macrofossil and pollen records of aquatic plants in a shallow lake

et al. 2005

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“…Yeo (1966) reported planting a single dormant apex of E crispus in a 5.9 m2 container. At the end of a single growing season this propagule yielded 23 250 dormant apices.…”

Section: Vegetative Life Cycle and Reproductionmentioning

confidence: 99%

Ecological life histories of the three aquatic nuisance plants, Myriophyllum spicatum, Potamogeton crispus and Elodea canadensis

Nichols¹,

1986

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The life histories of Myriophyllum spicatum L., Elodea canadensis Michx., and Potamogeton crispus L., serious aquatic nuisances in many regions of the world, are reviewed to provide insights into the life style of successful aquatic nuisance plants. Specifically, their distribution and spread in North America; their life cycle, productive and reproductive potential; and their ecosystem relationships are reviewed. Hopefully this review will improve a manager's ability to deal with aquatic nuisance problems. It also provides suggestions for basic research needed to develop more effective management practices.It was found that all three species possess a number of adaptations, including an ability to rapidly propagate vegetatively, an opportunistic nature for obtaining nutrients, a life cycle that favors cool weather, and a number of mechanisms which enhance photosynthetic efficiency, which allow them to proliferate.These three species do provide benefits to the ecosystem through their roles in materials cycling and energy flow. Therefore, management of these species should take an integrated approach which recognizes these benefits.The life history information available about the three species varies tremendously; however, a better understanding of resource gain and allocation is needed to manage all three species. Specifically, more research is needed to provide a better understanding of: 1) the role bicarbonate plays in photosynthesis, 2) the role roots play in supplying CO2 to the plants, 3) resource accumulation and allocation under different temperature and light regimes, 4) resource allocation on a seasonal basis, and 5) nutrient cycling under different management regimes.

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“…The role of tuber production in perennation is of key interest in management of freshwater ecosystems, and therefore is the major focus of this study. Reserves of starch are stored in chains of fingerlike branches that form at the nodes and end in a compact stipule that protects the underlying shoot bud (Yeo 1966). Formation of these tubers may be initiated by environmental cues in the form of depressed temperatures, decreased light intensity, changes in seasonal photoperiod length, nutrient deficiency, water deficiency, or changes in water chemistry (Sculthorpe 1967, Wiegleb and.…”

Section: Introductionmentioning

confidence: 98%

The Effect of Temperature and Daylength on the Germination ofPotamogeton nodosusTubers

Flint

Madsen

1995

Journal of Freshwater Ecology

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The effects of temperature and daylength were studied in the germination of American pondweed (Potamogeton nodosus Poir.) tubers. Germination was examined at temperatures ranging from 5 to 30°C in conjunction with light treatments of short and long daylength and continuous darkness. Greatest percentage of tuber germination occurred between 15 and 20°C. Within this temperature range, daylength did not significantly affect germination. Outside this temperature range, however, the absence of light inhibited germination. From these results, we conclude that temperature was the most important factor controlling germination, with an optimal range of 15 to 20°C. Daylength (l4:lO versus 10:14) had no effect on gemination, but the absence of light suppressed germination at 10, 25, and 30°C. The results were further supported by similar data obtained from a pond study of P. nodosus.

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Yields of Propagules of Certain Aquatic Plants I

Cited by 24 publications

References 0 publications

A 250 year comparison of historical, macrofossil and pollen records of aquatic plants in a shallow lake

A 250 year comparison of historical, macrofossil and pollen records of aquatic plants in a shallow lake

Ecological life histories of the three aquatic nuisance plants, Myriophyllum spicatum, Potamogeton crispus and Elodea canadensis

The Effect of Temperature and Daylength on the Germination ofPotamogeton nodosusTubers

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