We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Dominance and compromise in freshwater phytoplanktonic flagellates: the interaction of behavioural preferences for conflicting environmental gradients.
- Authors
Clegg, M. R.; Maberly, S. C.; Jones, R. I.
- Abstract
1. Motile phytoplanktonic flagellates display a suite of sensory-mediated behavioural preferences to single-environmental gradients. However, in nature multiple gradients of essential resources are often spatially and temporally conflicting, therefore it is important to understand how flagellate behaviours interact under these conditions. 2. Five species of these photosynthetic micro-organisms were exposed to combinations ot representative physical and chemical gradients in laboratory preference chambers. Using single-factor responses as templates, the effects of multiple gradients were investigated and hierarchies of preferences constructed. 3. Three distinct interaction responses were observed: 'dominance' of one of two preferences; bisecting 'compromise' interactions, suggesting co-dominance while potentially optimizing resource acquisition; and an 'extreme response' in which preferences appeared more important than avoidance ot unfavourable conditions. 4. In all species, preference for light was dominant over preference for temperature and phosphate More complex dominance, compromise and extreme interaction responses were induced by combinations ot light, oxygen and carbon dioxide gradients. 5. Construction ot a hierarchy ot dominant responses demonstrated that, depending on species, response to light generally superseded preferences for CO2, O2 and recessive preferences for temperature and phosphate. 6. Interaction responses may confer functional ecophysiological advantages, with dominant preferences influencing the spatial and temporal distribution, migration, depth regulation and succession of phytoplanktonic flagellates in freshwater ecosystems.
- Subjects
PHYTOPLANKTON; FRESHWATER ecology; PLANKTON; ECOPHYSIOLOGY; AQUATIC ecology; CARBON dioxide
- Publication
Functional Ecology, 2004, Vol 18, Issue 3, p371
- ISSN
0269-8463
- Publication type
Article
- DOI
10.1111/j.0269-8463.2004.00834.x