Evidence for pre-dispersal predation of seeds of <i>Tithonia diversifolia</i> by the black-faced canary (<i>Serinus capistratus</i>)

Seburanga, Jean Leonard

doi:10.1080/17429145.2014.962635

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Parrots are thought to be significant pre-dispersal seed predators that consume large quantities of seed crops (Coates-Estrada et al 1993;Francisco et al 2008;Villaseñor-Sánchez et al 2010;Seburanga 2014). In Australia, many parrots are considered to be generalist granivores consuming the seeds of a wide range of plant species (Long 1984;Lee et al 2013;McNab and Sanders 2014), including the yellow-tailed black cockatoo (Zanda funerea) (Mcinnes and Carne 1978;Possingham 1986;Stock et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Pre-dispersal seed-predation affects fruit crop and seed fitness in a highly fragmented savanna tree

Heyes,

Morgan,

Sinclair

et al. 2023

Aust. J. Bot.

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Context Silver banksia (Banksia marginata) savannas of south-eastern Australia were formerly widespread but are now largely cleared and fragmented, with small populations often showing recruitment limitation. Which may, in part, be due to seed predation by yellow-tailed black cockatoos (Zanda funerea), which have been observed foraging for seed. Aims The study aimed to investigate the impact of pre-dispersal seed predation by yellow-tailed black cockatoos on fruit crop between early development and seed release. Additionally, we wanted to assess seed fitness from partially damaged and discarded cones. Methods The study quantified silver banksia infructescence removal at four populations between early December and seed release in March. We also quantified seed mass and germinability of seeds from cones removed in December, February and March. Key results All populations experienced significant seed predation (>50%), with almost complete removal of cones from some populations. Early removal limits seed release from cones (only 18% of early removed follicles released seed). Further, early removal also significantly reduced seed mass and germination. Conclusions Pre-dispersal seed predation by cockatoos is likely to act as a strong filter for recruitment limitation in silver banksia, by negatively affecting annual seed crop size, seed fitness and germinability. Implications Our study showed the potential impact fragmentation can have on antagonistic plant–animal interactions. Small, isolated B. marginata populations are likely to continue to decline without active strategies to remedy seed predation such as large-scale restoration.

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Section: Introductionmentioning

confidence: 99%

Pre-dispersal seed-predation affects fruit crop and seed fitness in a highly fragmented savanna tree

Heyes,

Morgan,

Sinclair

et al. 2023

Aust. J. Bot.

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A New Method for Post-introduction Risk Assessment of Biological Invasions Among Introduced Shrubs in Developing Countries

Seburanga

Bizuru

Mwavu

et al. 2015

Environmental Management

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Risk-assessment methods are useful in collecting data that can help decision making to prevent the introduction of new species that have the potential of invading as well as in management of established taxa. Not only the complexity and unaffordability of available pre-introduction risk-assessment models make them rarely or inconsistently applied in the least-developed countries, but also there is lack of tools to assess the status of already introduced plant species. In this study, an affordable and rapid method of assessment of invasiveness among introduced plant species was developed and tested in Rwanda. This method defines three invasion stages (potential, effective, and suppressive invaders) and four levels of risk assessment: post-introduction assessment of species inherent invasive potential (Level 1), post-establishment assessment of species capacity of regeneration (Level 2), post-naturalization assessment of species range of occurrence and ability for long-distance dispersal (Level 3), and post-naturalization assessment of species ability to outcompete other plants in the community and transform the landscape (Level 4). A review of invasive species in Rwanda was developed through desk review, examination of herbarium records, and vegetation surveys. This method should be applicable in other countries that lack the means for a more conventional scientific investigation or under any circumstance where a quick and inexpensive assessment is needed. The method could be useful to environmental managers for timely intervention with strategies specific to different stages of invasion (post-introduction, post-establishment, or post-naturalization) and allocate resources accordingly.

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The Forgotten Savannas of Western Victoria: Population Dynamics of Tree-form Silver Banksia (Banksia marginata) in a Severely Fragmented Landscape

Heyes¹

2020

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Evidence for pre-dispersal predation of seeds of Tithonia diversifolia by the black-faced canary (Serinus capistratus)

Cited by 3 publications

References 24 publications

Pre-dispersal seed-predation affects fruit crop and seed fitness in a highly fragmented savanna tree

Pre-dispersal seed-predation affects fruit crop and seed fitness in a highly fragmented savanna tree

A New Method for Post-introduction Risk Assessment of Biological Invasions Among Introduced Shrubs in Developing Countries

The Forgotten Savannas of Western Victoria: Population Dynamics of Tree-form Silver Banksia (Banksia marginata) in a Severely Fragmented Landscape

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