Cellular substructures in the optic tectum of Antarctic and temperate fish
The brain of Antarctic fish of the perciform suborder Notothenioidea was analysed with lightand electronmicroscopical methods. The overall organization and ultrastructure of the optic tectum is very similar to that of fish from temperate climates. However, unusual structures were observed in neurons...
Published in: | Journal of Zoology |
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Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1996.tb05398.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1996.tb05398.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1996.tb05398.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1996.tb05398.x |
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crwiley:10.1111/j.1469-7998.1996.tb05398.x 2024-06-02T07:58:14+00:00 Cellular substructures in the optic tectum of Antarctic and temperate fish Kourtje, K.‐H. Aich, B. Lips, K. Rahmann, H. 1996 http://dx.doi.org/10.1111/j.1469-7998.1996.tb05398.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1996.tb05398.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1996.tb05398.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1996.tb05398.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 238, issue 2, page 333-350 ISSN 0952-8369 1469-7998 journal-article 1996 crwiley https://doi.org/10.1111/j.1469-7998.1996.tb05398.x 2024-05-03T11:49:10Z The brain of Antarctic fish of the perciform suborder Notothenioidea was analysed with lightand electronmicroscopical methods. The overall organization and ultrastructure of the optic tectum is very similar to that of fish from temperate climates. However, unusual structures were observed in neurons and glial cells, sometimes in high frequencies. The structures are ovoid or elongated, about 200‐600 nm in diameter and surrounded by two layers of membranes in a uniform distance of about 30 nm. The enclosed inter‐membrane space is similar to extracellular space, both in size and in cytochemical calcium precipitation, while the interior of the structures resembles cytoplasm. These structures are sometimes connected to neuronal processes, so that they seem to originate by a sort of budding process, but most of them are isolated as can be concluded from thick sections of up to 800 nm thickness, analysed with energy‐filtering transmission electron microscopy (EFTEM). These unusual objects are present in high abundance in members of the white‐blooded Antarctic fish family Channichthyidae. These so‐called icefish lack haemoglobin and exhibit the highest degree of cold adaptation. The red‐blooded notothenoid fish had smaller amounts of these structures and they were observed even in fish from temperate climates (trout, carp, cichlid fish). In fish from temperate climates the unusual substructures were more abundant during adaptation to cold water temperatures (winter) than to warm conditions (summer). Therefore, the findings may indicate a general phenomenon of cold adaptation with unusual interactions of neurons and glial cells, but the precise function is not yet understood. Article in Journal/Newspaper Antarc* Antarctic Icefish Wiley Online Library Antarctic Journal of Zoology 238 2 333 350 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
The brain of Antarctic fish of the perciform suborder Notothenioidea was analysed with lightand electronmicroscopical methods. The overall organization and ultrastructure of the optic tectum is very similar to that of fish from temperate climates. However, unusual structures were observed in neurons and glial cells, sometimes in high frequencies. The structures are ovoid or elongated, about 200‐600 nm in diameter and surrounded by two layers of membranes in a uniform distance of about 30 nm. The enclosed inter‐membrane space is similar to extracellular space, both in size and in cytochemical calcium precipitation, while the interior of the structures resembles cytoplasm. These structures are sometimes connected to neuronal processes, so that they seem to originate by a sort of budding process, but most of them are isolated as can be concluded from thick sections of up to 800 nm thickness, analysed with energy‐filtering transmission electron microscopy (EFTEM). These unusual objects are present in high abundance in members of the white‐blooded Antarctic fish family Channichthyidae. These so‐called icefish lack haemoglobin and exhibit the highest degree of cold adaptation. The red‐blooded notothenoid fish had smaller amounts of these structures and they were observed even in fish from temperate climates (trout, carp, cichlid fish). In fish from temperate climates the unusual substructures were more abundant during adaptation to cold water temperatures (winter) than to warm conditions (summer). Therefore, the findings may indicate a general phenomenon of cold adaptation with unusual interactions of neurons and glial cells, but the precise function is not yet understood. |
format |
Article in Journal/Newspaper |
author |
Kourtje, K.‐H. Aich, B. Lips, K. Rahmann, H. |
spellingShingle |
Kourtje, K.‐H. Aich, B. Lips, K. Rahmann, H. Cellular substructures in the optic tectum of Antarctic and temperate fish |
author_facet |
Kourtje, K.‐H. Aich, B. Lips, K. Rahmann, H. |
author_sort |
Kourtje, K.‐H. |
title |
Cellular substructures in the optic tectum of Antarctic and temperate fish |
title_short |
Cellular substructures in the optic tectum of Antarctic and temperate fish |
title_full |
Cellular substructures in the optic tectum of Antarctic and temperate fish |
title_fullStr |
Cellular substructures in the optic tectum of Antarctic and temperate fish |
title_full_unstemmed |
Cellular substructures in the optic tectum of Antarctic and temperate fish |
title_sort |
cellular substructures in the optic tectum of antarctic and temperate fish |
publisher |
Wiley |
publishDate |
1996 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1996.tb05398.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1996.tb05398.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1996.tb05398.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1996.tb05398.x |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Icefish |
genre_facet |
Antarc* Antarctic Icefish |
op_source |
Journal of Zoology volume 238, issue 2, page 333-350 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1996.tb05398.x |
container_title |
Journal of Zoology |
container_volume |
238 |
container_issue |
2 |
container_start_page |
333 |
op_container_end_page |
350 |
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1800741516777357312 |