Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1
During 1977, the population density of Hydra in the rocky littoral community in Toolik Lake, Alaska, increased from June to a maximum in late July or early August, then remained stable or decreased slightly through late August. The summer increase of Hydra corresponded to increases in the availabili...
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crwiley:10.4319/lo.1981.26.4.0697 2024-04-28T08:09:25+00:00 Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 Cuker, Benjamin E. Mozley, Samuel C. 1981 http://dx.doi.org/10.4319/lo.1981.26.4.0697 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1981.26.4.0697 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1981.26.4.0697 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 26, issue 4, page 697-708 ISSN 0024-3590 1939-5590 Aquatic Science Oceanography journal-article 1981 crwiley https://doi.org/10.4319/lo.1981.26.4.0697 2024-04-08T06:50:04Z During 1977, the population density of Hydra in the rocky littoral community in Toolik Lake, Alaska, increased from June to a maximum in late July or early August, then remained stable or decreased slightly through late August. The summer increase of Hydra corresponded to increases in the availability of copepods and Bosmina (the preferred prey) until late July. Hydra kept at lake temperatures in the laboratory with unlimited prey reproduced fast enough asexually to account for these increases: at 19°C the intrinsic rate of increase ( r , biomass) was 0.53 g·g ‒1 ·d ‒1 , and at 11°C, r = 0.31·d ‒1 . These rates, much higher than those for other Hydra at comparable temperatures, seem to be a metabolic adaptation to arctic conditions. Failure of the Hydra population to continue to increase while food resources increased in August is attributed to predation by Lymnaea, displacement by epilithic algal growth, endogenously controlled emigration from the rocky littoral, or some combination of these. Hydra appears to be the most important predator on Bosmina. Hydra at densities of 135·m ‒2 on the rocky shoals could take 1,620 Bosmina · m ‒2 ·d −1 during late July and early August 1977, about 10% per day consumption of the estimated lake standing crop of Bosmina. This is the first evidence that Hydra plays a major role in controlling a prey population. Article in Journal/Newspaper Arctic Alaska Copepods Wiley Online Library Limnology and Oceanography 26 4 697 708 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
topic |
Aquatic Science Oceanography |
spellingShingle |
Aquatic Science Oceanography Cuker, Benjamin E. Mozley, Samuel C. Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 |
topic_facet |
Aquatic Science Oceanography |
description |
During 1977, the population density of Hydra in the rocky littoral community in Toolik Lake, Alaska, increased from June to a maximum in late July or early August, then remained stable or decreased slightly through late August. The summer increase of Hydra corresponded to increases in the availability of copepods and Bosmina (the preferred prey) until late July. Hydra kept at lake temperatures in the laboratory with unlimited prey reproduced fast enough asexually to account for these increases: at 19°C the intrinsic rate of increase ( r , biomass) was 0.53 g·g ‒1 ·d ‒1 , and at 11°C, r = 0.31·d ‒1 . These rates, much higher than those for other Hydra at comparable temperatures, seem to be a metabolic adaptation to arctic conditions. Failure of the Hydra population to continue to increase while food resources increased in August is attributed to predation by Lymnaea, displacement by epilithic algal growth, endogenously controlled emigration from the rocky littoral, or some combination of these. Hydra appears to be the most important predator on Bosmina. Hydra at densities of 135·m ‒2 on the rocky shoals could take 1,620 Bosmina · m ‒2 ·d −1 during late July and early August 1977, about 10% per day consumption of the estimated lake standing crop of Bosmina. This is the first evidence that Hydra plays a major role in controlling a prey population. |
format |
Article in Journal/Newspaper |
author |
Cuker, Benjamin E. Mozley, Samuel C. |
author_facet |
Cuker, Benjamin E. Mozley, Samuel C. |
author_sort |
Cuker, Benjamin E. |
title |
Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 |
title_short |
Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 |
title_full |
Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 |
title_fullStr |
Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 |
title_full_unstemmed |
Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1 |
title_sort |
summer population fluctuations, feeding, and growth of hydra in an arctic lake1 |
publisher |
Wiley |
publishDate |
1981 |
url |
http://dx.doi.org/10.4319/lo.1981.26.4.0697 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1981.26.4.0697 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1981.26.4.0697 |
genre |
Arctic Alaska Copepods |
genre_facet |
Arctic Alaska Copepods |
op_source |
Limnology and Oceanography volume 26, issue 4, page 697-708 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.1981.26.4.0697 |
container_title |
Limnology and Oceanography |
container_volume |
26 |
container_issue |
4 |
container_start_page |
697 |
op_container_end_page |
708 |
_version_ |
1797577801348415488 |