Anterior regeneration in the spionid polychaetes<Emphasis Type="Italic"> Dipolydora quadrilobata</Emphasis> and<Emphasis Type="Italic"> Pygospio elegans</Emphasis> |
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Authors: | Sara M Lindsay Jennifer L Jackson Si Qing He |
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Institution: | (1) School of Marine Sciences, University of Maine, Orono, ME 04469, USA;(2) Present address: School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA |
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Abstract: | Like many other benthic infaunal invertebrates, spionid polychaetes often lose portions of their bodies to predators, which
affects their activities. Feeding palp loss and tail loss have been studied in several spionids, but the capacity for anterior
tissue regeneration has not been compared in different species. The present study examines anterior tissue regeneration in
two species, Dipolydora quadrilobata (Jacobi 1883) and Pygospio elegans Claparède 1863, in two laboratory experiments. Tissue removal treatments included removal of palps only, removal of anterior
tissue through the first setiger, anterior tissue through the fifth setiger, all anterior tissue through half of the gill-bearing
setigers, and all anterior tissue through the last gill-bearing setiger. Regeneration was monitored by capturing images of
the worms and digitizing the area of regenerated anterior tissue or counting the number of segments that grew over time. Worms
of both species regenerated anterior tissue regardless of the amount removed. Morphogenesis during regeneration followed a
similar pattern in these two species regardless of the amount of anterior tissue lost, progressing from wound healing to formation
of a recognizable prostomium and peristomium (“head”) by 6 days post-ablation. Palp and setal growth, addition of segments,
and formation of nuchal organs and the ciliated food groove followed so that worms appeared to have re-grown “normal,” but
smaller, “heads” and palps by 9–12 days following ablation. Over the course of 16 days, worms that lost more segments regenerated
less tissue relative to their initial intact size and did so more slowly. There was no significant palp growth during the
first 3 days following ablation. Rate of segment addition was directly related to the degree of tissue loss in D. quadrilobata. P. elegans added segments at similar rates whether 50 or 70% of the original segments was removed. |
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