Modelling the Population Dynamics of an Annual Plant Sorghum Intrans in the Wet-Dry Tropics

Watkinson, Andrew R.; Lonsdale, W. M.; Andrew, M. H.

doi:10.2307/2260923

Cited by 96 publications

(68 citation statements)

References 42 publications

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“…High plant density led to decrease in individual plant size and the amount of seeds produced by the plant (Pacala & Silander, 1990). High plant density could also have delayed seed set (Wulff, 1986;Watkinson et al, 1989). Weiner et al (1997) pointed that high plant densities have little effect on average seed Quantifying seed production by volunteer canola ...…”

Section: Resultsmentioning

confidence: 99%

Quantifying seed production by volunteer canola (Brassica napus) and Sinapis arvensis

Soltani

Galeshi

et al. 2011

Planta daninha

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-Volunteer canola (Brassica napus) and Sinapis arvensis are well identified weeds of different cropping systems. Quantitative information on regarding seed production by them is limited. Such information is necessary to model dynamics of soil seed banks. The aim of this work was to quantify seed production as a function of the size of those weeds. A wide range of plant size was produced by using a fan seeding system performed at two sowing dates (environments). Plant size varied from 3 to 167 g per plant for canola and from 6 to 104 g per plant for S. arvensis. Seed production ranged from 543 to14,773 seeds per plant for canola, and from 264 to 10,336 seeds per plant for S. arvensis. There was a close relationship between seed production per plant and plant size which was well-described by a power function (y = 130.6x 0.94 ; R 2 = 0.93 for canola and y = 28x 1.27 ; R 2 = 0.95 for S. arvensis). There was also strong relationships among the number of pods produced in individual plants and the quantity of seeds produced (g per plant) with the size of the plant. The relationships found in this study can be used in dynamic seed bank models of volunteer canola and S. arvensis.Keywords: weed, plant size, density, planting.RESUMO -Voluntários de canola (Brassica napus) e Sinapis arvensis são conhecidas como plantas daninhas na produção agrícola. A informação quantitativa sobre a produção de sementes de ervas daninhas por estas é limitada. A informação é necessária para a dinâmica do modelo de bancos de sementes do solo. O objetivo deste trabalho foi quantificar a produção de sementes em função do tamanho destas plantas daninhas. Uma grande variedade de tamanho das plantas foi produzido usando-se um sistema de semeadura em leque, realizado em duas épocas de semeadura (ambientes). O tamanho da planta variou entre 3 e 167 g por planta para a canola e entre 6 e 104 g por planta para S. arvensis. A produção de sementes variou entre 543 e 14.773 sementes por planta de canola e entre 264 e 10.336 de sementes por planta para S.arvensis. Houve uma estreita relação entre a produção de sementes por planta e o tamanho da planta que foi bem descrita por uma função potência (y = 130,6x 0.94 ; R 2 = 0,93 para a canola e y = 28x 1.27 ; R 2 = 0,95 para S. arvensis). Houve também algumas fortes relações entre o número de vagens produzidas em plantas individuais e a quantidade de sementes produzidas (g por planta) com o tamanho da planta. Relações encontradas neste estudo podem ser usadas em modelos dinâmicos do banco de sementes de canola voluntária e S. arvensis.Palavras-chave: planta daninha, tamanho da planta, densidade, plantio.

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Section: Resultsmentioning

confidence: 99%

Quantifying seed production by volunteer canola (Brassica napus) and Sinapis arvensis

Soltani

Galeshi

et al. 2011

Planta daninha

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“…This is logical, as seed production of an annual plant without a substantial seedbank determines the number of individuals in the next generation (Watkinson et al 1989). Other studies have shown that even when there is a low density of B. tectorum individuals, if those individuals produce a large quantity of seeds, then populations can remain viable (Hulbert 1955).…”

Section: Discussionmentioning

confidence: 99%

Effects of precipitation change and neighboring plants on population dynamics of Bromus tectorum

Prevéy

Seastedt

2015

Oecologia

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Shifting precipitation patterns resulting from global climate change will influence the success of invasive plant species. In the Front Range of Colorado, Bromus tectorum (cheatgrass) and other non-native winter annuals have invaded grassland communities and are becoming more abundant. As the global climate warms, more precipitation may fall as rain rather than snow in winter, and an increase in winter rain could benefit early-growing winter annuals, such as B. tectorum, to the detriment of native species. In this study we measured the effects of simulated changes in seasonal precipitation and presence of other plant species on population growth of B. tectorum in a grassland ecosystem near Boulder, Colorado, USA. We also performed elasticity analyses to identify life transitions that were most sensitive to precipitation differences. In both study years, population growth rates were highest for B. tectorum growing in treatments receiving supplemental winter precipitation and lowest for those receiving the summer drought treatment. Survival of seedlings to flowering and seed production contributed most to population growth in all treatments. Biomass of neighboring native plants was positively correlated with reduced population growth rates of B. tectorum. However, exotic plant biomass had no effect on population growth rates. This study demonstrates how interacting effects of climate change and presence of native plants can influence the population growth of an invasive species. Overall, our results suggest that B. tectorum will become more invasive in grasslands if the seasonality of precipitation shifts towards wetter winters and allows B. tectorum to grow when competition from native species is low.

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“…Dense grass and litter cover may also inhibit the foraging efficiency or movements of granivorous birds, and some fire may be beneficial in allowing such species to find fallen seeds of grasses and herbs more readily (Woinarski 1990;Dostine et al 2001). However, fire may destroy some of these seeds (Watkinson et al 1989) and fires of greater intensity destroy more seed. In the short term, fire may also influence the phenology and productivity of plant species, and hence of bird species that eat seeds, fruit or nectar (Crowley and Garnett 1999;Vigilante and Bowman 2004b).…”

Section: Framework For Responsesmentioning

confidence: 99%

The impacts of fire on birds in Australia's tropical savannas

Woinarski

Legge

2013

Emu - Austral Ornithology

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Abstract. The ecology of Australia's tropical savannas is shaped by the near-pervasive influence of fire. Constituting 20% of Australia's land area, tropical savannas contribute >75% of the area burnt in Australia each year. Across most of Australia's tropical savannas, components of biodiversity are declining, including many species of birds. This review seeks to assess whether that decline is linked to current fire regimes. However, relevant studies are few, short-term and opportunistic, and indicate rather than demonstrate the effects of fire. There is no set of agreed paradigms for contextualising the relationship between birds and fire regimes in this region or for any management consequences. We conclude that the current fire regime is suboptimal for many species of birds, particularly for granivores, frugivores, hollow-dependent species and those that nest on or near the ground. For conservation reserves, we recommend that fire management protocols include the explicit targets that: (1) at least 25% of the savanna landscape is at least 3 years unburnt; (2) at least 5% is at least 10 years unburnt; (3) fire-sensitive non-savanna vegetation types are increasing or stable and (4) populations of selected hollownesting, ground-nesting, frugivorous and granivorous birds are increasing or stable. We also identify key knowledge gaps that currently inhibit conservation management.

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Modelling the Population Dynamics of an Annual Plant Sorghum Intrans in the Wet-Dry Tropics

Cited by 96 publications

References 42 publications

Quantifying seed production by volunteer canola (Brassica napus) and Sinapis arvensis

Quantifying seed production by volunteer canola (Brassica napus) and Sinapis arvensis

Effects of precipitation change and neighboring plants on population dynamics of Bromus tectorum

The impacts of fire on birds in Australia's tropical savannas

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