DOI: 10.1139/f94-241. Fossil Pigment Records of Phytoplankton in Trout-stocked Alpine Lakes

Fossil Pigment Records of Phytoplankton in Trout-stocked Alpine Lakes

10.1139/f94-241

Crossref journal-article

Canadian Science Publishing

Canadian Journal of Fisheries and Aquatic Sciences (155)

Abstract

Paleolimnology, bioenergetics modelling, and mesocosm experiments were used to quantify changes in phytoplankton following introduction of trout into fishless alpine lakes in the Canadian Rocky Mountains. During the 1960s, Snowflake and Pipit lakes were stocked with brook (Salvelinus fontinalis), cutthroat (Oncorhynchus clarkii) and rainbow trout (O. mykiss) either singly or in combination. Stocked trout eliminated large invertebrates (Daphnia spp., Hesperodiaptomus arcticus, Gamrnarus lacustris), but the fish died within 15 yr. High performance liquid chromatographic analysis of carotenoids and chlorophylls in sediments inferred that algal abundance increased 4- to 10-fold shortly after fish stocking. In contrast, phytoplankton composition and biomass were constant in nearby, unstocked Harrison Lake, as inferred from fossils. Pigment analysis of mesocosms showed that phytoplankton were sensitive to moderate fertilization: 11 μg P∙L−1resulted in four- to six-fold increases in algal biomass. Bioenergetics modelling was used to estimate phosphorus (P) excretion from trout. The flux of excreted P was highly correlated (r2 = 0.76, p < 0.0001, N = 12) to changes in algal biomass, as estimated from fossil pheophytin b. Consequently, we infer that nutrient recycling by stocked trout was one of several mechanisms that contributed to increased algal biomass.

Bibliography

Leavitt, P. R., Schindler, D. E., Paul, A. J., Hardie, A. K., & Schindler, D. W. (1994). Fossil Pigment Records of Phytoplankton in Trout-stocked Alpine Lakes. Canadian Journal of Fisheries and Aquatic Sciences, 51(11), 2411â2423.

Authors 5

P. R. Leavitt (first)
D. E. Schindler (additional)
A. J. Paul (additional)
A. K. Hardie (additional)
D. W. Schindler (additional)

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Dates

Type	When
Created	17 years ago (July 29, 2008, 10:48 a.m.)
Deposited	2 years, 3 months ago (May 19, 2023, 6:54 a.m.)
Indexed	1 month, 3 weeks ago (July 2, 2025, 11:59 a.m.)
Issued	30 years, 9 months ago (Nov. 1, 1994)
Published	30 years, 9 months ago (Nov. 1, 1994)
Published Print	30 years, 9 months ago (Nov. 1, 1994)

Funders 0

None

BibTeX

@article{Leavitt_1994, title={Fossil Pigment Records of Phytoplankton in Trout-stocked Alpine Lakes}, volume={51}, ISSN={1205-7533}, url={http://dx.doi.org/10.1139/f94-241}, DOI={10.1139/f94-241}, number={11}, journal={Canadian Journal of Fisheries and Aquatic Sciences}, publisher={Canadian Science Publishing}, author={Leavitt, P. R. and Schindler, D. E. and Paul, A. J. and Hardie, A. K. and Schindler, D. W.}, year={1994}, month=nov, pages={2411–2423} }

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  "abstract": "<jats:p>Paleolimnology, bioenergetics modelling, and mesocosm experiments were used to quantify changes in phytoplankton following introduction of trout into fishless alpine lakes in the Canadian Rocky Mountains. During the 1960s, Snowflake and Pipit lakes were stocked with brook (Salvelinus fontinalis), cutthroat (Oncorhynchus clarkii) and rainbow trout (O. mykiss) either singly or in combination. Stocked trout eliminated large invertebrates (Daphnia spp., Hesperodiaptomus arcticus, Gamrnarus lacustris), but the fish died within 15\u2002yr. High performance liquid chromatographic analysis of carotenoids and chlorophylls in sediments inferred that algal abundance increased 4- to 10-fold shortly after fish stocking. In contrast, phytoplankton composition and biomass were constant in nearby, unstocked Harrison Lake, as inferred from fossils. Pigment analysis of mesocosms showed that phytoplankton were sensitive to moderate fertilization: 11\u2002\u03bcg P\u2219L<jats:sup>\u22121</jats:sup>resulted in four- to six-fold increases in algal biomass. Bioenergetics modelling was used to estimate phosphorus (P) excretion from trout. The flux of excreted P was highly correlated (r<jats:sup>2</jats:sup>\u2002=\u20020.76, p\u2002&lt;\u20020.0001, N\u2002=\u200212) to changes in algal biomass, as estimated from fossil pheophytin b. Consequently, we infer that nutrient recycling by stocked trout was one of several mechanisms that contributed to increased algal biomass.</jats:p>",
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