1. Transitions in morphology, nematocyst distribution, fluid motions, and prey capture during development of the scyphomedusa Cyanea capillata
- Author
-
Higgins, III, J.E., Ford, M.D., and Costello, J.H.
- Subjects
Influence ,Physiological aspects ,Research ,Properties ,Food and nutrition ,Environmental aspects ,Fluid mechanics -- Influence -- Environmental aspects -- Research -- Physiological aspects ,Animal development -- Research -- Physiological aspects -- Environmental aspects ,Cnidocytes -- Properties -- Physiological aspects -- Research -- Environmental aspects ,Jellyfishes -- Physiological aspects -- Food and nutrition -- Environmental aspects -- Research ,Animal morphology -- Research -- Physiological aspects -- Environmental aspects ,Predation (Biology) -- Physiological aspects -- Research -- Environmental aspects ,Morphology (Animals) -- Research -- Physiological aspects -- Environmental aspects ,Nematocysts -- Properties -- Physiological aspects -- Research -- Environmental aspects - Abstract
Introduction Trophic impacts of scyphomedusae upon planktonic communities are known to be substantial (Lindahl and Hernroth, 1983; Moller, 1984; Feigenbaum and Kelly, 1984; Behrends and Schneider, 1995), and research on [...], Like that of most scyphozoans, the ontogeny of Cyanea capillata medusae involves substantive alterations in feeding structures and mechanics. We used video and optical microscopy approaches to quantify these ontogenetic changes in morphology, flow, and feeding of C. capillata medusae. We found that alterations in gross morphology and nematocyst distributions coincided with a shift from prey capture on the manubrium or lappets of ephyrae (bell diameter 0.2-0.4 cm) to capture primarily on the tentacles in adult medusae (diameter >1.0 cm). These changes occurred within a hydrodynamic framework that itself changed due to medusan growth. Viscous forces were important in flows around small ephyrae (maximum Re [10.sup.2]). The relative timing of these events indicates that ontogenetic processes are closely synchronized with alterations in the hydrodynamic environment within which C. capillata medusae develop.
- Published
- 2008