. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100 P. J. KRUG AND A. E. MANZI metamorphosis live Vaucheria twiga <itac metamorphosed in response to water condi- tioned with the hard coral Porites compressa (Hadfield, 1977; Hadfield and Scheuer, 1985). Larvae of the dorid nudibranch Adalaria proxima metamorphosed in seawater conditioned by the preferred adult prey, the bryozoan Elec- tro pilosa (Lambert and Todd. 1994). However, metamor- phosis of A. proxima larvae could only be induced by live colonies of E. pilosa and not by dead colonies or homoge- nized extracts (T
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100 P. J. KRUG AND A. E. MANZI metamorphosis live Vaucheria twiga <itac metamorphosed in response to water condi- tioned with the hard coral Porites compressa (Hadfield, 1977; Hadfield and Scheuer, 1985). Larvae of the dorid nudibranch Adalaria proxima metamorphosed in seawater conditioned by the preferred adult prey, the bryozoan Elec- tro pilosa (Lambert and Todd. 1994). However, metamor- phosis of A. proxima larvae could only be induced by live colonies of E. pilosa and not by dead colonies or homoge- nized extracts (Todd ct ai. 1991; Lambert and Todd. 1994). In contrast, dead and homogenized V. longicaulis tissue induced metamorphosis in A. modesta. Secreted settlement cues are also involved in gregarious settlement of some species. Larvae of the sand dollars Dendraster excentricus and Echinarachinus parma meta- morphosed in response to sand beds and seawater condi- tioned by the presence of adult conspecifics (Burke, 1984; Pearce and Scheibling, 1990). The most detailed studies on the effects of a secreted chemical settlement cue have fo- cused on the oyster Crassostrea virginica. Larvae altered their swimming speed and turning rate in response to small basic peptides secreted by adult conspecifics, significantly increasing settlement in both still and moving water in response to the dissolved cue (Tamburri et ai, 1992; Turner ct ill., 1994; Tamburri el <//., 1996). These results demon- strate that soluble chemicals can increase settlement rates by influencing the behavior of larvae still suspended in the water column (Turner et al, 1994). The relative importance of the secretion of the Vaucheria-denved cue to the settle- ment of Alderia modesta larvae in the field will require further study. However, the rapidity of the conditioning process suggests that absorbent mats of V. longicaulis may become saturated with naturally conditioned water during high tides, which might induce settleme
Size: 2253px × 1109px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
