ABSTRACT The responses to temperature change of sympatric diploid and pentaploid brine shrimp _Artemia parthenogenetica_ were studied. Pentaploids survive better at extremes of both cold

(0°C) and heat (37.5°C). When placed in a thermal gradient ranging from 12.5 to 35.1°C, diploids generally located at temperatures above 19°C while pentaploids were more evently distributed

along the gradient. These results suggest that pentaploids may be better suited to temperature extremes than sympatric diploids. Our study provides the first experimental evidence in animals

of differential temperature use by conspecific sympatric diploid and polyploid organisms. Our literature review indicates that polyploid _Artemia_ are found with greater frequency in low

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College of Oceanography, China. Google Scholar  Download references ACKNOWLEDGEMENTS We are grateful to C. E. King for providing Artemia cysts, and M. D. Lefcort for help in the design and

operation of the thermal gradient. We thank C. E. King A. R. Blaustein, M. J. Beaton and an anonymous reviewer for constructive comments on the manuscript. B. A. Menge provided statistical

advice. We especially benefited from communication with R. A. Browne. This research is supported by the Department of Zoology, Oregon State University, Research grants to both authors, and a

Sigma Xi Grant-In-Aid of Research to HL. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Zoology, Oregon State University, Corvallis, 97331-2914, OR, USA L Zhang & H Lefcort

Authors * L Zhang View author publications You can also search for this author inPubMed Google Scholar * H Lefcort View author publications You can also search for this author inPubMed 

Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Zhang, L., Lefcort, H. The effects of ploidy level on the thermal distributions of brine

shrimp _Artemia parthenogenetica_ and its ecological implications. _Heredity_ 66, 445–452 (1991). https://doi.org/10.1038/hdy.1991.54 Download citation * Received: 11 September 1990 * Issue

Date: 01 June 1991 * DOI: https://doi.org/10.1038/hdy.1991.54 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a

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thermal distributions