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Life History Tactics in Cohorts of a Partial Migratory Brown Trout (Salmo trutta L.) Population
Joint Authors
Olsson, Ivan C.
Greenberg, Larry A.
Source
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2011-10-19
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Earth Science , Water and Environment
Abstract EN
We monitored temporal changes in body size for three cohorts of a partial migratory, lake-migrating brown trout population.
We tested if body mass differed between nonmigratory males, migrants, and other members of the cohort (females and immature males).
We hypothesized that large-sized individuals would mature as nonmigratory males or migrate at younger ages than small-sized individuals.
As previous studies have shown that female fecundity is influenced by body size and that more trout from the downstream section (D) of the stream migrated than from the upstream section (U), we hypothesized that there would be a greater proportion of mature males in D than U.
We found that body size of males that reproduced was similar to migrants that migrated the subsequent spring and larger than other cohort members.
Reproducing males had a larger body size than equal-aged males that delayed reproduction.
Similarly, individuals that migrated had a larger body size than equal-aged individuals that migrated subsequently.
The proportion of mature males was greater in D than in U.
The fact that body size differentiation occurred late in ontogeny and that age of maturation and migration varied within cohorts suggests that the decision to mature or migrate might be conditionally dependent.
American Psychological Association (APA)
Olsson, Ivan C.& Greenberg, Larry A.. 2011. Life History Tactics in Cohorts of a Partial Migratory Brown Trout (Salmo trutta L.) Population. ISRN Ecology،Vol. 2011, no. 2011, pp.1-7.
https://search.emarefa.net/detail/BIM-507749
Modern Language Association (MLA)
Olsson, Ivan C.& Greenberg, Larry A.. Life History Tactics in Cohorts of a Partial Migratory Brown Trout (Salmo trutta L.) Population. ISRN Ecology No. 2011 (2011), pp.1-7.
https://search.emarefa.net/detail/BIM-507749
American Medical Association (AMA)
Olsson, Ivan C.& Greenberg, Larry A.. Life History Tactics in Cohorts of a Partial Migratory Brown Trout (Salmo trutta L.) Population. ISRN Ecology. 2011. Vol. 2011, no. 2011, pp.1-7.
https://search.emarefa.net/detail/BIM-507749
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-507749