Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan
Abstract Comprehensive studies on the population dynamics of colonial organisms require estimates of mortality from the level of the individual module (partial mortality) to the entire colony (whole‐colony mortality), as well as determining the factors that affect mortality at each level of organiza...
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crwiley:10.1002/ecs2.1483 2024-06-02T08:12:16+00:00 Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan Denley, Danielle Metaxas, Anna Natural Sciences and Engineering Research Council of Canada Natural Sciences and Engineering Research Council of Canada 2016 http://dx.doi.org/10.1002/ecs2.1483 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecs2.1483 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1483 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.1483 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1483 en eng Wiley http://creativecommons.org/licenses/by/3.0/ Ecosphere volume 7, issue 10 ISSN 2150-8925 2150-8925 journal-article 2016 crwiley https://doi.org/10.1002/ecs2.1483 2024-05-03T10:37:36Z Abstract Comprehensive studies on the population dynamics of colonial organisms require estimates of mortality from the level of the individual module (partial mortality) to the entire colony (whole‐colony mortality), as well as determining the factors that affect mortality at each level of organization. However, accurate measurements of whole‐colony and partial mortality of modular organisms can be difficult to obtain, and few studies involve concurrent measurements of modular and colony mortality. We implemented multiple approaches to measure whole‐colony and partial mortality of modular species using the colonial bryozoan Membranipora membranacea as a model organism. M. membranacea is a cosmopolitan species and of particular ecological significance in the northwest Atlantic, where it is the dominant epiphyte on laminarian kelps and the main driver for the defoliation of kelp beds. Rates of whole‐colony mortality were measured in the field (1) indirectly through repeated subsampling cohort analyses and (2) directly by tagging colonies in situ. Partial mortality of colonies was measured (1) in the field by quantifying the proportion of degenerated zooids per colony and (2) in the laboratory by monitoring loss of colony surface area during seasonal senescence of colonies over winter. Temporal patterns differed substantially between partial and whole‐colony mortality, suggesting that factors affecting mortality of individual modules differ from those affecting whole colonies. Our study indicated that the accuracy of common methods for measuring mortality of modular organisms depends on the species‐specific life‐history characteristics. However, we suggest that rates and mechanisms of whole‐colony and partial mortality can be most accurately quantified by revisiting tagged individuals in situ and recording loss of entire colonies (whole‐colony mortality) and loss of living colony area (partial mortality) between successive sampling times. For M. membranacea , measuring whole‐colony or partial mortality in ... Article in Journal/Newspaper Northwest Atlantic Wiley Online Library Ecosphere 7 10 |
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English |
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Abstract Comprehensive studies on the population dynamics of colonial organisms require estimates of mortality from the level of the individual module (partial mortality) to the entire colony (whole‐colony mortality), as well as determining the factors that affect mortality at each level of organization. However, accurate measurements of whole‐colony and partial mortality of modular organisms can be difficult to obtain, and few studies involve concurrent measurements of modular and colony mortality. We implemented multiple approaches to measure whole‐colony and partial mortality of modular species using the colonial bryozoan Membranipora membranacea as a model organism. M. membranacea is a cosmopolitan species and of particular ecological significance in the northwest Atlantic, where it is the dominant epiphyte on laminarian kelps and the main driver for the defoliation of kelp beds. Rates of whole‐colony mortality were measured in the field (1) indirectly through repeated subsampling cohort analyses and (2) directly by tagging colonies in situ. Partial mortality of colonies was measured (1) in the field by quantifying the proportion of degenerated zooids per colony and (2) in the laboratory by monitoring loss of colony surface area during seasonal senescence of colonies over winter. Temporal patterns differed substantially between partial and whole‐colony mortality, suggesting that factors affecting mortality of individual modules differ from those affecting whole colonies. Our study indicated that the accuracy of common methods for measuring mortality of modular organisms depends on the species‐specific life‐history characteristics. However, we suggest that rates and mechanisms of whole‐colony and partial mortality can be most accurately quantified by revisiting tagged individuals in situ and recording loss of entire colonies (whole‐colony mortality) and loss of living colony area (partial mortality) between successive sampling times. For M. membranacea , measuring whole‐colony or partial mortality in ... |
author2 |
Natural Sciences and Engineering Research Council of Canada Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Denley, Danielle Metaxas, Anna |
spellingShingle |
Denley, Danielle Metaxas, Anna Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
author_facet |
Denley, Danielle Metaxas, Anna |
author_sort |
Denley, Danielle |
title |
Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
title_short |
Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
title_full |
Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
title_fullStr |
Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
title_full_unstemmed |
Quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
title_sort |
quantifying mortality of modular organisms: a comparison of partial and whole‐colony mortality in a colonial bryozoan |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1002/ecs2.1483 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecs2.1483 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1483 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.1483 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1483 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Ecosphere volume 7, issue 10 ISSN 2150-8925 2150-8925 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1002/ecs2.1483 |
container_title |
Ecosphere |
container_volume |
7 |
container_issue |
10 |
_version_ |
1800758662101204992 |