Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina
Recognizing the abiotic and biotic parameters that favor one reproductive strategy over another can reveal much about population dynamics and aid in understanding diverging traits in different environments. This thesis work explores abiotic and biotic causes for a population of Zostera marina (eelgr...
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San Francisco State University
2013
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ftcalifstateuniv:oai:scholarworks:ng451p14c 2024-09-30T14:33:16+00:00 Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina Stephanie Linnéa Eriksson Kiriakopolos Katharyn E. Boyer William Cochlan Sarah Cohen 2013 http://hdl.handle.net/10211.3/128892 English eng San Francisco State University Science & Engineering Biology: Concentration in Integrative Biology http://hdl.handle.net/10211.3/128892 Copyright by Stephanie Linnéa Eriksson Kiriakopolos, 2013 AS36 2013 BIOL .K57 Masters Thesis 2013 ftcalifstateuniv 2024-09-10T17:06:16Z Recognizing the abiotic and biotic parameters that favor one reproductive strategy over another can reveal much about population dynamics and aid in understanding diverging traits in different environments. This thesis work explores abiotic and biotic causes for a population of Zostera marina (eelgrass, a marine angiosperm) to partition re productively into subtidal perennial and intertidal annual zones. A tidal simulator experiment and field measurements of abiotic variables did not support a previous hypothesis that intertidal exposure favors an annual life history. However, experimental exclusion of Branta canadensis (Canada geese) identified an herbivore driven fall mortality event that occurs annually. Additional evidence documented plants within this population flowering and dying prior to the influx of Canada geese. These cryptic "true annuals" will over time contribute more progeny to future generations, while perennial plants are allocating energy to growth and storage, resources that go unutilized following geese grazing. Consumers have been hypothesized as a selective force for semelparity (programmed mortality following flowering); however, this may be the first empirical example of herbivore-mediated selection toward semelparity in any plant species. Master Thesis Branta canadensis Scholarworks from California State University Canada |
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Scholarworks from California State University |
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ftcalifstateuniv |
language |
English |
description |
Recognizing the abiotic and biotic parameters that favor one reproductive strategy over another can reveal much about population dynamics and aid in understanding diverging traits in different environments. This thesis work explores abiotic and biotic causes for a population of Zostera marina (eelgrass, a marine angiosperm) to partition re productively into subtidal perennial and intertidal annual zones. A tidal simulator experiment and field measurements of abiotic variables did not support a previous hypothesis that intertidal exposure favors an annual life history. However, experimental exclusion of Branta canadensis (Canada geese) identified an herbivore driven fall mortality event that occurs annually. Additional evidence documented plants within this population flowering and dying prior to the influx of Canada geese. These cryptic "true annuals" will over time contribute more progeny to future generations, while perennial plants are allocating energy to growth and storage, resources that go unutilized following geese grazing. Consumers have been hypothesized as a selective force for semelparity (programmed mortality following flowering); however, this may be the first empirical example of herbivore-mediated selection toward semelparity in any plant species. |
author2 |
Katharyn E. Boyer William Cochlan Sarah Cohen |
format |
Master Thesis |
author |
Stephanie Linnéa Eriksson Kiriakopolos |
spellingShingle |
Stephanie Linnéa Eriksson Kiriakopolos Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina |
author_facet |
Stephanie Linnéa Eriksson Kiriakopolos |
author_sort |
Stephanie Linnéa Eriksson Kiriakopolos |
title |
Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina |
title_short |
Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina |
title_full |
Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina |
title_fullStr |
Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina |
title_full_unstemmed |
Herbivory selects for semelparity in a typically iteroparous plant species, Zostera marina |
title_sort |
herbivory selects for semelparity in a typically iteroparous plant species, zostera marina |
publisher |
San Francisco State University |
publishDate |
2013 |
url |
http://hdl.handle.net/10211.3/128892 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Branta canadensis |
genre_facet |
Branta canadensis |
op_source |
AS36 2013 BIOL .K57 |
op_relation |
http://hdl.handle.net/10211.3/128892 |
op_rights |
Copyright by Stephanie Linnéa Eriksson Kiriakopolos, 2013 |
_version_ |
1811637218867937280 |