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Original Paper

Differences in Relative Hippocampus Volume and Number of Hippocampus Neurons among Five Corvid Species

Gould K.L.a · Gilbertson K.E.a · Hrvol A.J.a · Nelson J.C.a · Seyfer A.L.a · Brantner R.M.a · Kamil A.C.b

Author affiliations

aDepartment of Psychology, Luther College, Decorah, Iowa, and bSchool of Biological Sciences and Department of Psychology, University of Nebraska-Lincoln, Lincoln, Nebr., USA

Related Articles for ""

Brain Behav Evol 2013;81:56–70

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: January 27, 2012
Accepted: October 31, 2012
Published online: January 29, 2013
Issue release date: February 2013

Number of Print Pages: 15
Number of Figures: 7
Number of Tables: 4

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE

Abstract

The relative size of the avian hippocampus (Hp) has been shown to be related to spatial memory and food storing in two avian families, the parids and corvids. Basil et al. [Brain Behav Evol 1996;47:156–164] examined North American food-storing birds in the corvid family and found that Clark’s nutcrackers had a larger relative Hp than pinyon jays and Western scrub jays. These results correlated with the nutcracker’s better performance on most spatial memory tasks and their strong reliance on stored food in the wild. However, Pravosudov and de Kort [Brain Behav Evol 2006;67:1–9] raised questions about the methodology used in the 1996 study, specifically the use of paraffin as an embedding material and recalculation for shrinkage. Therefore, we measured relative Hp volume using gelatin as the embedding material in four North American species of food-storing corvids (Clark’s nutcrackers, pinyon jays, Western scrub jays and blue jays) and one Eurasian corvid that stores little to no food (azure-winged magpies). Although there was a significant overall effect of species on relative Hp volume among the five species, subsequent tests found only one pairwise difference, blue jays having a larger Hp than the azure-winged magpies. We also examined the relative size of the septum in the five species. Although Shiflett et al. [J Neurobiol 2002;51:215–222] found a difference in relative septum volume amongst three species of parids that correlated with storing food, we did not find significant differences amongst the five species in relative septum. Finally, we calculated the number of neurons in the Hp relative to body mass in the five species and found statistically significant differences, some of which are in accord with the adaptive specialization hypothesis and some are not.

© 2013 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: January 27, 2012
Accepted: October 31, 2012
Published online: January 29, 2013
Issue release date: February 2013

Number of Print Pages: 15
Number of Figures: 7
Number of Tables: 4

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE


Copyright / Drug Dosage / Disclaimer

Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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