. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LOCALIZED REPRODUCTION IN A MARINE BRVOZOAN 293 tracer studies (Best and Thorpe, 1985; Miles, Harvell. Griggs, and Eisner, unpub.). Furthermore, even colonies fed near the growing edge only translocate to the nearest edge, confirming that transport is unidirectional (Miles, Harvell, Griggs, and Eisner, unpub.). The simplest model of translocation assumes equal transport through all pores of a zooid, with rates deter- mined by sink strength. Because axial pore plates are slightly different than lateral plates morphologically,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LOCALIZED REPRODUCTION IN A MARINE BRVOZOAN 293 tracer studies (Best and Thorpe, 1985; Miles, Harvell. Griggs, and Eisner, unpub.). Furthermore, even colonies fed near the growing edge only translocate to the nearest edge, confirming that transport is unidirectional (Miles, Harvell, Griggs, and Eisner, unpub.). The simplest model of translocation assumes equal transport through all pores of a zooid, with rates deter- mined by sink strength. Because axial pore plates are slightly different than lateral plates morphologically, it is not unreasonable to hypothesize higher transport axially than laterally. Both because of a bias to axial transport and because the growing margin of a colony is a strong carbon sink, transport rates should be greatest in a distal direction. In Figure 7 a hypothetical model of the direction and quantity of carbon flow through zooids for each of the sink disruption treatments is shown. Although trans- port is normally polarized in a proximo-distal direction, this polarity can presumably be reversed to support re- growth in proximal regions of the colony when these are damaged (Jackson and Palumbi. 1979; Harvell, 1984). When the edge sink is disrupted, the polarity of translo- cation should change and the flow of carbon either be redirected to the next most active sink or zooids at the edge should reproduce with the surplus carbon. In the case of the 1/2-damage treatment, the next sink is on the other side of the colony and so the response might be reverse translocation. Because the sink is so distant, the translocation is expected to be weak and zooids keep most of the carbon they take in (Fig. 7B). In the case of the 4/8-damage treatment, the next sink is adjacent to the short length of disrupted edge and is still in close proximity to zooids via the lateral pores (Fig. 7C). Thus we hypoth- esize that the zooids in the 4/8-damage experiment re- mained nonreproductive beca
Size: 1081px × 2312px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
