The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout
Brown trout were introduced to Newfoundland in the late 1800s and are now established in watersheds on the Avalon, Burin and Bonavista peninsulas. Little is known about estuary use by brown trout outside of their native or their impacts to native Atlantic salmon and brook charr. A relatively pristin...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
Memorial University of Newfoundland
2013
|
Subjects: | |
Online Access: | https://research.library.mun.ca/9902/ https://research.library.mun.ca/9902/1/Warner_Lucas.pdf |
id |
ftmemorialuniv:oai:research.library.mun.ca:9902 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialuniv:oai:research.library.mun.ca:9902 2023-10-01T03:54:37+02:00 The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout Warner, Lucas Alexander 2013 application/pdf https://research.library.mun.ca/9902/ https://research.library.mun.ca/9902/1/Warner_Lucas.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/9902/1/Warner_Lucas.pdf Warner, Lucas Alexander <https://research.library.mun.ca/view/creator_az/Warner=3ALucas_Alexander=3A=3A.html> (2013) The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2013 ftmemorialuniv 2023-09-03T06:47:37Z Brown trout were introduced to Newfoundland in the late 1800s and are now established in watersheds on the Avalon, Burin and Bonavista peninsulas. Little is known about estuary use by brown trout outside of their native or their impacts to native Atlantic salmon and brook charr. A relatively pristine watershed in eastern Newfoundland was chosen to investigate seasonal use of estuary habitat by these three species, and to investigated if I) the incidence of anadromy in each species, 2) the quality of offspring of anadromous and resident, and 3) if the waterfalls are barriers to migration. A fourth objective was to test if a laser ablation "drilling" technique can successfully extract growth history information from otoliths. Abundance of adult brown trout was relatively consistent throughout the year, but capture of adult Atlantic salmon was limited to August (28 : 1 brown trout to salmon caught). Abundance of parr and smolt was greater in spring and summer, a pattern consistent between species, with the exception of a large pulse of salmon smolt during one day. Atlantic salmon and brown trout young of year were largely offspring of anadromous females, while brook charr young of year were largely offspring of resident females. Brook charr were bigger than Atlantic salmon at post emergence midstream, upstream and end of growing season upstream. Brown trout were bigger than Atlantic salmon at post emergence midstream, while the opposite was found at end of growing season downstream. No size differences were found between brown trout and brook charr. Otolith core Sr concentration was not a function of rearing habitat and laser ablation can clearly distinguish between freshwater and marine environments using a "drilling" or retrospective technique. Thesis Atlantic salmon Newfoundland Memorial University of Newfoundland: Research Repository |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Research Repository |
op_collection_id |
ftmemorialuniv |
language |
English |
description |
Brown trout were introduced to Newfoundland in the late 1800s and are now established in watersheds on the Avalon, Burin and Bonavista peninsulas. Little is known about estuary use by brown trout outside of their native or their impacts to native Atlantic salmon and brook charr. A relatively pristine watershed in eastern Newfoundland was chosen to investigate seasonal use of estuary habitat by these three species, and to investigated if I) the incidence of anadromy in each species, 2) the quality of offspring of anadromous and resident, and 3) if the waterfalls are barriers to migration. A fourth objective was to test if a laser ablation "drilling" technique can successfully extract growth history information from otoliths. Abundance of adult brown trout was relatively consistent throughout the year, but capture of adult Atlantic salmon was limited to August (28 : 1 brown trout to salmon caught). Abundance of parr and smolt was greater in spring and summer, a pattern consistent between species, with the exception of a large pulse of salmon smolt during one day. Atlantic salmon and brown trout young of year were largely offspring of anadromous females, while brook charr young of year were largely offspring of resident females. Brook charr were bigger than Atlantic salmon at post emergence midstream, upstream and end of growing season upstream. Brown trout were bigger than Atlantic salmon at post emergence midstream, while the opposite was found at end of growing season downstream. No size differences were found between brown trout and brook charr. Otolith core Sr concentration was not a function of rearing habitat and laser ablation can clearly distinguish between freshwater and marine environments using a "drilling" or retrospective technique. |
format |
Thesis |
author |
Warner, Lucas Alexander |
spellingShingle |
Warner, Lucas Alexander The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout |
author_facet |
Warner, Lucas Alexander |
author_sort |
Warner, Lucas Alexander |
title |
The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout |
title_short |
The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout |
title_full |
The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout |
title_fullStr |
The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout |
title_full_unstemmed |
The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout |
title_sort |
incidence of anadromy and season estuary use of native atlantic salmon and brook charr, and invasive brown trout |
publisher |
Memorial University of Newfoundland |
publishDate |
2013 |
url |
https://research.library.mun.ca/9902/ https://research.library.mun.ca/9902/1/Warner_Lucas.pdf |
genre |
Atlantic salmon Newfoundland |
genre_facet |
Atlantic salmon Newfoundland |
op_relation |
https://research.library.mun.ca/9902/1/Warner_Lucas.pdf Warner, Lucas Alexander <https://research.library.mun.ca/view/creator_az/Warner=3ALucas_Alexander=3A=3A.html> (2013) The incidence of anadromy and season estuary use of native Atlantic salmon and brook charr, and invasive brown trout. Masters thesis, Memorial University of Newfoundland. |
op_rights |
thesis_license |
_version_ |
1778522448834068480 |