Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica
We studied the bryozoan assemblage encrusting valves of the Patagonian scallop, Psychrochlamys patagonica, in 4 beds distributed along the continental shelf off Argentina to analyse (a) the distribution pattern of bryozoan colonies in different zones of the valves, (b) the influence of interspecific...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2009-03-01
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| Series: | Scientia Marina |
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| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1051 |
| _version_ | 1818938956945817600 |
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| author | Juan López Gappa Néstor A. Landoni |
| author_facet | Juan López Gappa Néstor A. Landoni |
| author_sort | Juan López Gappa |
| collection | DOAJ |
| description | We studied the bryozoan assemblage encrusting valves of the Patagonian scallop, Psychrochlamys patagonica, in 4 beds distributed along the continental shelf off Argentina to analyse (a) the distribution pattern of bryozoan colonies in different zones of the valves, (b) the influence of interspecific competition on assemblage composition, (c) whether encrusting species display different space utilisation strategies, and (d) whether bryozoan species richness and number of colonies vary in relation to host size. The assemblage was composed of 22 taxa and was dominated by Arachnopusia monoceros and Osthimosia eatonensis, which were at least one order of magnitude more abundant than any other species. Multivariate analyses based on coverage data of multiserial bryozoans separated the beds according to species richness rather than to geographic proximity and showed significant differences in assemblage structure between upper (left) and lower (right) valves and among beds. Competitive interactions occurred almost exclusively on lower valves, and more frequently in peripheral zones than in central zones of these valves. Correlations between valve area and number of bryozoan colonies, coverage and species richness were low but significant. Bryozoans were significantly more frequent, larger, and taxonomically diverse on lower valves than on upper valves. The uniserial colonies of Neothoa cf. chiloensis, the weakest bryozoan competitor, were as frequent in central zones as they were in peripheral zones, and usually spread out along channels on the scallop surface. This fugitive species was partially covered by multiserial colonies, but managed to persist even in peripheral areas of the lower valves. |
| first_indexed | 2024-12-20T06:16:06Z |
| format | Article |
| id | doaj.art-49845797eb6a496baf2eace05fcf1bcb |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-20T06:16:06Z |
| publishDate | 2009-03-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-49845797eb6a496baf2eace05fcf1bcb2022-12-21T19:50:33ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342009-03-0173116117110.3989/scimar.2009.73n11611041Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonicaJuan López Gappa0Néstor A. Landoni1Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”We studied the bryozoan assemblage encrusting valves of the Patagonian scallop, Psychrochlamys patagonica, in 4 beds distributed along the continental shelf off Argentina to analyse (a) the distribution pattern of bryozoan colonies in different zones of the valves, (b) the influence of interspecific competition on assemblage composition, (c) whether encrusting species display different space utilisation strategies, and (d) whether bryozoan species richness and number of colonies vary in relation to host size. The assemblage was composed of 22 taxa and was dominated by Arachnopusia monoceros and Osthimosia eatonensis, which were at least one order of magnitude more abundant than any other species. Multivariate analyses based on coverage data of multiserial bryozoans separated the beds according to species richness rather than to geographic proximity and showed significant differences in assemblage structure between upper (left) and lower (right) valves and among beds. Competitive interactions occurred almost exclusively on lower valves, and more frequently in peripheral zones than in central zones of these valves. Correlations between valve area and number of bryozoan colonies, coverage and species richness were low but significant. Bryozoans were significantly more frequent, larger, and taxonomically diverse on lower valves than on upper valves. The uniserial colonies of Neothoa cf. chiloensis, the weakest bryozoan competitor, were as frequent in central zones as they were in peripheral zones, and usually spread out along channels on the scallop surface. This fugitive species was partially covered by multiserial colonies, but managed to persist even in peripheral areas of the lower valves.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1051bryozoapatagonian scalloppsychrochlamys patagonicainterspecific competitionspace utilisation patternspatagonian shelfsw atlantic |
| spellingShingle | Juan López Gappa Néstor A. Landoni Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica Scientia Marina bryozoa patagonian scallop psychrochlamys patagonica interspecific competition space utilisation patterns patagonian shelf sw atlantic |
| title | Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica |
| title_full | Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica |
| title_fullStr | Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica |
| title_full_unstemmed | Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica |
| title_short | Space utilisation patterns of bryozoans on the Patagonian scallop Psychrochlamys patagonica |
| title_sort | space utilisation patterns of bryozoans on the patagonian scallop psychrochlamys patagonica |
| topic | bryozoa patagonian scallop psychrochlamys patagonica interspecific competition space utilisation patterns patagonian shelf sw atlantic |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1051 |
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