Seasonal herbivory and mortality compensation in a swan-pondweed system.
Many birds feed on submerged macrophytes during a temporally discrete period every year, for instance during migratory stopover or at the wintering grounds. Hence, seasonal herbivory is a common feature of the life cycle in many aquatic macrophytes. We are interested in the effect of Bewick's s...
Published in: | Ecological Modelling |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2002
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Online Access: | https://lup.lub.lu.se/record/149279 https://doi.org/10.1016/S0304-3800(01)00426-4 |
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ftulundlup:oai:lup.lub.lu.se:713e1107-3e84-4f6c-b0c6-2525ee77c2d1 2023-05-15T15:59:44+02:00 Seasonal herbivory and mortality compensation in a swan-pondweed system. Jonzén, Niclas Nolet, B A Santamaria, L Svensson, Mats 2002 https://lup.lub.lu.se/record/149279 https://doi.org/10.1016/S0304-3800(01)00426-4 eng eng Elsevier https://lup.lub.lu.se/record/149279 http://dx.doi.org/10.1016/S0304-3800(01)00426-4 wos:000173592500002 scopus:0037196378 Ecological Modelling; 147(3), pp 209-219 (2002) ISSN: 0304-3800 Social Sciences Interdisciplinary Biological Sciences contributiontojournal/article info:eu-repo/semantics/article text 2002 ftulundlup https://doi.org/10.1016/S0304-3800(01)00426-4 2023-02-01T23:28:15Z Many birds feed on submerged macrophytes during a temporally discrete period every year, for instance during migratory stopover or at the wintering grounds. Hence, seasonal herbivory is a common feature of the life cycle in many aquatic macrophytes. We are interested in the effect of Bewick's swans (Cygnus columbianus bewickii) feeding on the tubers of fennel pondweed (Potamogeton pectinatus) in the Netherlands every autumn. For that purpose, we developed a sequential macrophyte population model, including seasons of tuber production, herbivory and winter mortality as distinct and unambiguously defined events. The model is characterised and parameterised with both field and laboratory data. Tuber consumption inevitably decreases the density of ramets sprouting next spring, but it may actually increase the density of tubers produced in the following autumn. Hence, we can only understand the effect of grazing on the fennel pondweed population by recognising the seasonal structure of density-dependence. The mean density of fennel pondweed and the yield taken by swans are dependent on the foraging threshold below which no grazing takes place. Furthermore, the consumption has a stabilising effect for a wide range of parameter values. Article in Journal/Newspaper Cygnus columbianus Lund University Publications (LUP) Ecological Modelling 147 3 209 219 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Social Sciences Interdisciplinary Biological Sciences |
spellingShingle |
Social Sciences Interdisciplinary Biological Sciences Jonzén, Niclas Nolet, B A Santamaria, L Svensson, Mats Seasonal herbivory and mortality compensation in a swan-pondweed system. |
topic_facet |
Social Sciences Interdisciplinary Biological Sciences |
description |
Many birds feed on submerged macrophytes during a temporally discrete period every year, for instance during migratory stopover or at the wintering grounds. Hence, seasonal herbivory is a common feature of the life cycle in many aquatic macrophytes. We are interested in the effect of Bewick's swans (Cygnus columbianus bewickii) feeding on the tubers of fennel pondweed (Potamogeton pectinatus) in the Netherlands every autumn. For that purpose, we developed a sequential macrophyte population model, including seasons of tuber production, herbivory and winter mortality as distinct and unambiguously defined events. The model is characterised and parameterised with both field and laboratory data. Tuber consumption inevitably decreases the density of ramets sprouting next spring, but it may actually increase the density of tubers produced in the following autumn. Hence, we can only understand the effect of grazing on the fennel pondweed population by recognising the seasonal structure of density-dependence. The mean density of fennel pondweed and the yield taken by swans are dependent on the foraging threshold below which no grazing takes place. Furthermore, the consumption has a stabilising effect for a wide range of parameter values. |
format |
Article in Journal/Newspaper |
author |
Jonzén, Niclas Nolet, B A Santamaria, L Svensson, Mats |
author_facet |
Jonzén, Niclas Nolet, B A Santamaria, L Svensson, Mats |
author_sort |
Jonzén, Niclas |
title |
Seasonal herbivory and mortality compensation in a swan-pondweed system. |
title_short |
Seasonal herbivory and mortality compensation in a swan-pondweed system. |
title_full |
Seasonal herbivory and mortality compensation in a swan-pondweed system. |
title_fullStr |
Seasonal herbivory and mortality compensation in a swan-pondweed system. |
title_full_unstemmed |
Seasonal herbivory and mortality compensation in a swan-pondweed system. |
title_sort |
seasonal herbivory and mortality compensation in a swan-pondweed system. |
publisher |
Elsevier |
publishDate |
2002 |
url |
https://lup.lub.lu.se/record/149279 https://doi.org/10.1016/S0304-3800(01)00426-4 |
genre |
Cygnus columbianus |
genre_facet |
Cygnus columbianus |
op_source |
Ecological Modelling; 147(3), pp 209-219 (2002) ISSN: 0304-3800 |
op_relation |
https://lup.lub.lu.se/record/149279 http://dx.doi.org/10.1016/S0304-3800(01)00426-4 wos:000173592500002 scopus:0037196378 |
op_doi |
https://doi.org/10.1016/S0304-3800(01)00426-4 |
container_title |
Ecological Modelling |
container_volume |
147 |
container_issue |
3 |
container_start_page |
209 |
op_container_end_page |
219 |
_version_ |
1766395657458810880 |