Life History of Sago Pondweed

Yeo, R. R.

doi:10.2307/4040884

Cited by 48 publications

(27 citation statements)

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“…It should be noted, however, that habitat availability in that region is limited by the scarcity of permanent waterbodies (since most shallow lakes dry up during the summer) or by major fluctuations in water depth (Gafny and Gasith 1999). Hence, P. pectinatus is most abundant at middle latitudes in Europe (Hultén and Fries 1986), although the potential for clonal growth and multiplication is higher in the south (see also Yeo 1965).…”

Section: Discussionmentioning

confidence: 99%

“…Plants grow during spring-summer and survive the winter by means of subterranean tubers (specialized asexual propagules). Under mild climatic conditions, P. pectinatus may grow as a perennial (Yeo 1965). Annual seed production varies greatly and its contribution to yearly population recruitment is generally considered to be minimal in temperate regions (e.g., Van Wijk 1989).…”

Section: Methodsmentioning

confidence: 99%

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Plant Performance Across Latitude: The Role of Plasticity and Local Adaptation in an Aquatic Plant

Santamarı́a

Figuerola

Pilon

et al. 2003

Ecology

133

128

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Abstract. Geographic variation can lead to the evolution of different local varieties within a given species, therefore influencing its distribution and genetic structure. We investigated the contribution of plasticity and local adaptation to the performance of a common aquatic plant (Potamogeton pectinatus) in contrasting climates, using reciprocal transplants at three experimental sites across a latitudinal cline in Europe. Plants from 54 genets, originally collected from 14 populations situated within four climatic regions (subarctic, cold temperate, mild temperate, and mediterranean) were grown in three different localities within three of these regions (cold temperate, Norway; mild temperate, The Netherlands; mediterranean, Spain). Tuber production was highest for the mild-temperate genets, irrespective of locality where the genets were grown. Selection coefficients indicated that populations at the European center of the species distribution perform better than all other populations, at all sites. However, marginal populations showed changes in life-history traits, such as compressed life cycles in the north and true perenniality in the south, that may allow them to perform better locally, at the limits of their distribution range. Our results thus suggest that local adaptation may overlap spatially with center-periphery gradients in performance caused by genetic factors (such as genetic drift and inbreeding in range-marginal populations).

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Plant Performance Across Latitude: The Role of Plasticity and Local Adaptation in an Aquatic Plant

Santamarı́a

Figuerola

Pilon

et al. 2003

Ecology

133

128

View full text Add to dashboard Cite

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“…Dispersal and colonization of new habitats by seeds and axillary turions are recognized as Chapter 2 POTAM: Description of IVIodel important characteristics of sago pondweed (Yeo 1965;Kantrud 1990). The latter processes, however, are better described using other modeling approaches (based on logistic regression or on descriptions of population dynamics varying in time and in space), as discussed by Scheffer (1991).…”

Section: Taxonomy and Distribution Of Sago Pondweed Within The Unitedmentioning

confidence: 99%

“…However, in deeper waters, green perennial sago pondweed shoots can be found (Hammer and Heseltine 1988). Flowering occurs once a year, from late June to August in the Northern Hemisphere (Yeo 1965). In mild climates, flowering may extend up to 5 months (Gupta 1968;Ramirez and San Martin 1984).…”

Section: Model Featuresmentioning

confidence: 99%

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A Simulation Model for Growth of the Submersed Aquatic Macrophyte Sago Pondweed (Potamogeton pectinatus L.)

Best¹,

Boyd²

2003

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A simulation model for biomass dynamics of the submersed macrophyte Potamogeton pectinatus L. is presented. The model (POTAM) is based on carbon flow through the vegetation in meter-squared (m^) water columns. It includes descriptions of several factors that affect biomass dynamics, such as site characteristic changes in climate, temperature, water transparency, water level, pH, and oxygen effects on CO2 assimilation rate at light saturation, wintering strategies, mechanical control (removal of shoot biomass), and grazing. The characteristics of community and site can be easily modified by the user.POTAM incorporates insight into the processes affecting the dynamics of a sago pondweed community in relatively shallow, hard water (0.1-to 6-m depth; dissolved inorganic carbon concentration > 0.8 mmol and pH > 6), under ample supply of nitrogen and phosphorus in a pest-, disease-, and competitor-free environment under the prevailing weather conditions. It has been calibrated on data pertaining to a sago pondweed community in the Western Canal near Zandvoort, The Netherlands. At this site, growth starts from the subterranean tubers alone. Plant biomass usually peaks once a year, in July, and intensive downward transport of soluble carbohydrates occurs after anthesis, used for the formation of tubers that grow into the sediment.POTAM simulated the dynamics of plant and tuber biomass and tuber numbers in the Western Canal near Zandvoort, The Netherlands, well over a period of 1 to 5 years. Starting from measured instead of nominal tuber size increased the similarity between simulated and measured plant data. The importance of several plant speciescharacteristic properties was explored, namely, of leaf surface:dry weight ratio, tuber bank density, anchorage depth, and presence/absence of wintering shoots.The model has been used to calculate plant and tuber biomass and tuber numbers for other sites as well. In Lake Veluwe, The Netherlands, a site with a temperate climate, simulated plant biomass and newly produced tuber densities were similar to measured ones in two consecutive years, but timing in the simulated plants was delayed the second year. In the Byrnes Canal, California, with a far warmer temperate climate, simulated plant biomass and tuber bank density were similar to measured values when a lower self-shading coefficient than the nominal one and the same tuber size/tuber number per plant as measured were used. However, plant biomass and tuber bank density were lower with the nominal self-shading coefficient. In the tropical Lake Ramgarh, India, a simulated peak plant biomass similar to measured was found using the same lower self-shading coefficient as run for the California site, and almost no tubers were formed. Verification of simulated with measured tuber numbers was not possible, since tubers had not been measured.Several case studies are presented in which POTAM generated insight useful for management aimed at conserving or controlling sago pondweed populations. The model was used to calculate t...

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Nesting Status and Chronology of Eared Grebes Along Great Salt Lake, Utah

Delahoussaye

Bell

Conover

2021

Wildlife Society Bulletin

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Eared grebes (Podiceps nigricollis) are colonial‐nesting waterbirds that breed in Canada and northern United States. Great Salt Lake (GSL), Utah, is vital to the survival of this species because all eared grebes in North America stage in the fall either on the GSL or Mono Lake, California. The importance of GSL and its surrounding wetlands for breeding eared grebes is unknown. We studied eared grebe nesting status and chronology in the freshwater wetlands around GSL and found over 4,280 nests distributed among 35 colonies during 2018 and 5,794 nests among 23 colonies during 2019. We also located the 2 largest colonies of this species ever recorded (902 and 1,492 nests). Mean clutch size differed between years and was 2.4 eggs during 2018 and 2.0 during 2019; clutch sizes were lower at GSL than in colonies located in more northern latitudes, perhaps due to a local paucity of invertebrate prey during the egg‐laying period. Grebe nests around the GSL were constructed with, and anchored to, growing Stuckenia pectinate. Eared grebes near GSL started laying eggs in the first week of June during 2018 and a week later during 2019. The number of incubated nests per colony peaked on 27 June during 2018 and 9 July during 2019. Nests continued to be incubated into August in both years. These dates are later than those reported in more‐northern colonies. The later nesting in GSL colonies could be due to the birds' need to wait for Stuckenia pectinata to form mats at the water surface. This plant species needs a water depth of 38 to 45 cm to thrive, and increasing amounts of freshwater from the GSL watershed are diverted for agriculture and human development. If this trend continues, there may not be enough water to maintain the required water depth for dense stands of Stuckenia; the loss of which may prevent the grebes from nesting. © 2021 The Wildlife Society.

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Life History of Sago Pondweed

Cited by 48 publications

References 0 publications

Plant Performance Across Latitude: The Role of Plasticity and Local Adaptation in an Aquatic Plant

Plant Performance Across Latitude: The Role of Plasticity and Local Adaptation in an Aquatic Plant

A Simulation Model for Growth of the Submersed Aquatic Macrophyte Sago Pondweed (Potamogeton pectinatus L.)

Nesting Status and Chronology of Eared Grebes Along Great Salt Lake, Utah

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