| Autor: |
Felicita Scapini, M. Fallaci, I. Colombini, M. Audoglio, L. Chelazzi, A. Aloia |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
Estuarine, Coastal and Shelf Science. 48:469-482 |
| ISSN: |
0272-7714 |
| DOI: |
10.1006/ecss.1998.0437 |
| Popis: |
A study on the surface activity and zonation ofTalorchestia britoand of two age classes ofTalitrus saltatorwas done along the French Atlantic coast. Samples were taken with a transect of pitfall traps and climatic data were recorded. The data were collected during two periods of 48 hours, one around spring tide and the other around neap tide. Activity patterns, mean hours of activity, total and hourly mean zonations and hourly orientation indices were calculated in daily and tidal hours at both spring and neap tides. Simple correlation analysis was used to compare between species and within age classes both the trends of the distributions of the activity patterns and those of the hourly mean zonations. Multiple regression analysis was employed to correlate surface activity and hourly mean zonation with environmental factors. The results indicate that both species were nocturnal and that most activity occurred on the ebbing tide. Total mean zonations changed between the two synodic phases with a landward shift at spring tide. Also, the hourly mean zonations varied during the activity period according to the tides and synodic phases. Juveniles ofT. saltatorpresented a more landward distribution compared with adults and compared withT. britowhich was always found closer to the sea. Zonation patterns seem to be related in a complex way to the environmental variables such as air relative humidity, sand temperature and moisture, atmospheric pressure and tidal elevation. Furthermore it was emphasized that for certain aspects the behavioural strategies of adultT. saltatordiffered from those of the juveniles and ofT. brito. On the whole this work shows the behavioural plasticity of littoral talitrids and the different strategies of two sympatric species in the use of space and time. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect