. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 5. Mature planulue larvae of Hvilractiniu symbiolongicarpus (at left) and Podocorynu curnea. Larvae of the former are significantly larger (nested ANOVA using the cross-within-species effect as the error term. F = , df = 1. 2. P = ). Relative larval size was also estimated using the BCA total protein assay. Results revealed that H. symbiolongicarpus larvae contain about 34% more protein on average than P. inriifu larvae. Scale bar = approx. 1 mm. longicarpus larvae (mean value of jug/larva) than in P.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 5. Mature planulue larvae of Hvilractiniu symbiolongicarpus (at left) and Podocorynu curnea. Larvae of the former are significantly larger (nested ANOVA using the cross-within-species effect as the error term. F = , df = 1. 2. P = ). Relative larval size was also estimated using the BCA total protein assay. Results revealed that H. symbiolongicarpus larvae contain about 34% more protein on average than P. inriifu larvae. Scale bar = approx. 1 mm. longicarpus larvae (mean value of jug/larva) than in P. earned larvae ( /xg/larva). Discussion Previous experimentation using clonally produced colo- nies has suggested that general life-history patterns of run- ners and sheets may not apply to these hydroids; that is, the runner-like Podocor\iui curneti dominates the sheet-like HvdractinUi symbiolongicarpus (McFadden, 1986; Van Winkle ct <//.. 2000). The data presented here support these studies: clonally produced colonies of P. airneu always overwhelmed those of H. symbiolongicarpus. Conversely, sexually produced colonies of H. symbiolongicarpus were able to defeat and overgrow P. curneii in more than 35% of competitive interactions. Hitherto unknown competitive be- havior was observed in sexually produced colonies of H. Figure 4. Image sequence of sexually produced competing colonies. Both species initially adopt a runner-like appearance as primary polyps (A). Hydriutima symbiohngictir/ni* (at left) begins directional growth toward Podocoryna ciirncti upon contact (B), after which the former responds by growing nematocyst-filled hyperplastic stolons in the direction of the stimulus. Many H. symbiolongicarpus colonies formed hyperplastic stolons (arrows) that grew directly over and destroyed the foreign tissue (B, C). ultimately forming an ectodermal mat and polyps over the newly acquired space (D). (A) Primary polyps; (B) 2 d post-contact; (C) 7 d post-contact; (D) 14 d p
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
