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BURROWING AND CRAWLING BEHAVIOUR OF THREE SPECIES OF UNIONIDAE IN FINLAND.

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Title: BURROWING AND CRAWLING BEHAVIOUR OF THREE SPECIES OF UNIONIDAE IN FINLAND.
Authors: SAARINEN, M.1 marisaar@cc.jyu.fi, TASKINEN, J.1
Source: Journal of Molluscan Studies. Feb2003, Vol. 69 Issue 1, p81-86. 6p. 3 Charts, 7 Graphs.
Subjects: Animal burrowing, Crawling & creeping, Anodonta, Unionidae, Clams
Geographic Terms: Finland
Abstract: The aim of this study was to examine the burrowing and crawling behaviour of three unionid clam species in the field. Of the four study lakes in southern Finland, Anodonta piscinalis occurred in all, Pseudanodonta complanata in three and Unio pictorum in only one. In all three species, there was a positive correlation between the height of the above-sediment part of the shell and the burrowing angle (deviation from the horizontal position). When surfacing, the position of the clam became more vertical. Anodonta piscinalis was more visible in June than in August in one population, while in other populations monthly differences were not found. The result suggests that A. piscinalis may be more visible during its spawning period in early summer (June) than in late summer. This behaviour could have a reproductive function, ensuring external fertilization. Monthly differences in crawling activity of A. piscinalis were also found in one population: in Lake Alvajärvi, A. piscinalis crawled more in August than in June. No monthly differences in the burrowing or crawling of P. complanata were found. In Unio pictorum, no differences were observed in crawling, but the clams were more visible in August than in June. When compared with P. complanata, A. piscinalis and U. pictorum were more visible and in a more vertical position. In A. piscinalis, the bigger individuals were more visible than the smaller individuals, but this was not the case in P. complanata and U. pictorum. [ABSTRACT FROM PUBLISHER]
Copyright of Journal of Molluscan Studies is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: BURROWING AND CRAWLING BEHAVIOUR OF THREE SPECIES OF UNIONIDAE IN FINLAND.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Molluscan+Studies%22">Journal of Molluscan Studies</searchLink>. Feb2003, Vol. 69 Issue 1, p81-86. 6p. 3 Charts, 7 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Animal+burrowing%22">Animal burrowing</searchLink><br /><searchLink fieldCode="DE" term="%22Crawling+%26+creeping%22">Crawling & creeping</searchLink><br /><searchLink fieldCode="DE" term="%22Anodonta%22">Anodonta</searchLink><br /><searchLink fieldCode="DE" term="%22Unionidae%22">Unionidae</searchLink><br /><searchLink fieldCode="DE" term="%22Clams%22">Clams</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Finland%22">Finland</searchLink>
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  Data: The aim of this study was to examine the burrowing and crawling behaviour of three unionid clam species in the field. Of the four study lakes in southern Finland, Anodonta piscinalis occurred in all, Pseudanodonta complanata in three and Unio pictorum in only one. In all three species, there was a positive correlation between the height of the above-sediment part of the shell and the burrowing angle (deviation from the horizontal position). When surfacing, the position of the clam became more vertical. Anodonta piscinalis was more visible in June than in August in one population, while in other populations monthly differences were not found. The result suggests that A. piscinalis may be more visible during its spawning period in early summer (June) than in late summer. This behaviour could have a reproductive function, ensuring external fertilization. Monthly differences in crawling activity of A. piscinalis were also found in one population: in Lake Alvajärvi, A. piscinalis crawled more in August than in June. No monthly differences in the burrowing or crawling of P. complanata were found. In Unio pictorum, no differences were observed in crawling, but the clams were more visible in August than in June. When compared with P. complanata, A. piscinalis and U. pictorum were more visible and in a more vertical position. In A. piscinalis, the bigger individuals were more visible than the smaller individuals, but this was not the case in P. complanata and U. pictorum. [ABSTRACT FROM PUBLISHER]
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  Data: <i>Copyright of Journal of Molluscan Studies is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1093/mollus/69.1.81
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        Text: English
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      – SubjectFull: Animal burrowing
        Type: general
      – SubjectFull: Crawling & creeping
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      – SubjectFull: Anodonta
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      – SubjectFull: Unionidae
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              Text: Feb2003
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