Photograph of four out of eight experimental blocks in the shallow lake Lauwersmeer shortly after... more Photograph of four out of eight experimental blocks in the shallow lake Lauwersmeer shortly after summer exclosure establishment in March 2005.
In clonal plants, vegetative parts may outcompete seeds in the absence of disturbance, limiting t... more In clonal plants, vegetative parts may outcompete seeds in the absence of disturbance, limiting the build‐up of genotypic diversity through repeated seedling recruitment (RSR). Herbivory may provide disturbance and trigger establishment of strong colonizers (seeds) at the expense of strong competitors (clonal propagules). In the clonal aquatic fennel pondweed Potamogeton pectinatus, two distinct herbivore guilds may modify the dynamics of propagation. In winter, Bewick's swans may deplete patches of tubers, promoting seedling establishment in spring. In summer, seed consumption by waterfowl can reduce the density of viable seeds but grazing may also reduce tuber production and hence facilitate seedling establishment. This study is among the first to experimentally test herbivore impact on plant genotypic diversity. We assess the separate and combined effects of both herbivore guilds on genotypic diversity and structure of fennel pondweed beds. Using microsatellites, we genotyped...
... Some authors reported a strong negative impact of herbivory by fish and waterfowl on total ..... more ... Some authors reported a strong negative impact of herbivory by fish and waterfowl on total ... In addition to reducing macrophyte biomass, herbivores may affect the community composition of aquatic vegetation (eg van Donk and Otte, 1996; Santamarıa, 2002; Rodrıguez ...
The degree to which vertebrate herbivores exploitatively compete for the same food plant may depe... more The degree to which vertebrate herbivores exploitatively compete for the same food plant may depend on the level of compensatory plant growth. Such compensation is higher when there is reduced density‐dependent competition in plants after herbivore damage. Whether there is relief from competition may largely be determined by the life‐history stage of plants under herbivory. Such stage‐specific compensation may apply to seasonal herbivory on the clonal aquatic plant sago pondweed (Potamogeton pectinatus L.). It winters in sediments of shallow lakes as tubers that are foraged upon by Bewick's Swans (Cygnus columbianus bewickii Yarrell), whereas aboveground biomass in summer is mostly consumed by ducks, coots, and Mute Swans. Here, tuber predation may be compensated due to diminished negative density dependence in the next growth season. However, we expected lower compensation to summer herbivory by waterfowl and fish as density of aboveground biomass in summer is closely related t...
Photograph of four out of eight experimental blocks in the shallow lake Lauwersmeer shortly after... more Photograph of four out of eight experimental blocks in the shallow lake Lauwersmeer shortly after summer exclosure establishment in March 2005.
In clonal plants, vegetative parts may outcompete seeds in the absence of disturbance, limiting t... more In clonal plants, vegetative parts may outcompete seeds in the absence of disturbance, limiting the build‐up of genotypic diversity through repeated seedling recruitment (RSR). Herbivory may provide disturbance and trigger establishment of strong colonizers (seeds) at the expense of strong competitors (clonal propagules). In the clonal aquatic fennel pondweed Potamogeton pectinatus, two distinct herbivore guilds may modify the dynamics of propagation. In winter, Bewick's swans may deplete patches of tubers, promoting seedling establishment in spring. In summer, seed consumption by waterfowl can reduce the density of viable seeds but grazing may also reduce tuber production and hence facilitate seedling establishment. This study is among the first to experimentally test herbivore impact on plant genotypic diversity. We assess the separate and combined effects of both herbivore guilds on genotypic diversity and structure of fennel pondweed beds. Using microsatellites, we genotyped...
... Some authors reported a strong negative impact of herbivory by fish and waterfowl on total ..... more ... Some authors reported a strong negative impact of herbivory by fish and waterfowl on total ... In addition to reducing macrophyte biomass, herbivores may affect the community composition of aquatic vegetation (eg van Donk and Otte, 1996; Santamarıa, 2002; Rodrıguez ...
The degree to which vertebrate herbivores exploitatively compete for the same food plant may depe... more The degree to which vertebrate herbivores exploitatively compete for the same food plant may depend on the level of compensatory plant growth. Such compensation is higher when there is reduced density‐dependent competition in plants after herbivore damage. Whether there is relief from competition may largely be determined by the life‐history stage of plants under herbivory. Such stage‐specific compensation may apply to seasonal herbivory on the clonal aquatic plant sago pondweed (Potamogeton pectinatus L.). It winters in sediments of shallow lakes as tubers that are foraged upon by Bewick's Swans (Cygnus columbianus bewickii Yarrell), whereas aboveground biomass in summer is mostly consumed by ducks, coots, and Mute Swans. Here, tuber predation may be compensated due to diminished negative density dependence in the next growth season. However, we expected lower compensation to summer herbivory by waterfowl and fish as density of aboveground biomass in summer is closely related t...
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