title: Textures and traction: how tube-dwelling polychaetes get a leg up.
abstract: By controlling the traction between its body and the tube wall, a tube-dwelling polychaete can move efficiently from one end of its tube to the other, brace its body during normal functions (e.g., ventilation and feeding), and anchor within its tube avoiding removal by predators. To examine the potential physical interaction between worms and the tubes they live in, scanning electron microscopy was used to reveal and quantify the morphology of worm bodies and the tubes they produce for species representing 13 families of tube-dwelling polychaetes. In the tubes of most species there were macroscopic or nearly macroscopic (∼10 μm-1 mm) bumps or ridges that protruded slightly into the lumen of the tube; these could provide purchase as a worm moves or anchors. At this scale (∼10 μm-1 mm), the surfaces of the chaetal heads that interact with the tube wall were typically small enough to fit within spaces between these bumps (created by the inward projection of exogenous materials incorporated into the tube wall) or ridges (made by secretions on the interior surface of the tube). At a finer scale (0.01-10 μm), there was a second overlap in size, usually between the dentition on the surfaces of chaetae that interact with the tube walls and the texture provided by the secreted strands or microscopic inclusions of the inner linings. These linings had a surprising diversity of micro-textures. The most common micro-texture was a "fabric" of secreted threads, but there were also orderly micro-ridges, wrinkles, and rugose surfaces provided by microorganisms incorporated into the inner tube lining. Understanding the fine structures of tubes in conjunction with the morphologies of the worms that build them gives insight into how tubes are constructed and how worms live within them.
authors.affiliation: Department of Biology, Swarthmore College Swarthmore, Pennsylvania, 19081, USA.
authors.forename: Rachel Ann
authors.initials: RA
authors.lastname: Merz
keywords: Annelida; attachment; chaetae; paleae; uncini
references.citation: J Biol Chem. 2001 Mar 16;276(11):8051-8
references.pmid: 11113138
references.citation: Biol Bull. 2001 Apr;200(2):107-17
references.pmid: 11341572
references.citation: Proc Natl Acad Sci U S A. 2002 Sep 17;99(19):12252-6
references.pmid: 12198184
references.citation: Proc Natl Acad Sci U S A. 2003 Sep 16;100(19):10603-6
references.pmid: 12960386
references.citation: J Exp Biol. 2004 Dec;207(Pt 26):4727-34
references.pmid: 15579565
references.citation: J Biol Chem. 2005 Dec 30;280(52):42938-44
references.pmid: 16227622
references.citation: J R Soc Interface. 2006 Jun 22;3(8):441-51
references.pmid: 16849272
references.citation: Oecologia. 2007 Feb;151(1):161-73
references.pmid: 17136395
references.citation: J Exp Biol. 2007 Apr;210(Pt 8):1481-8
references.pmid: 17401131
references.citation: BMC Evol Biol. 2007 Apr 05;7:57
references.pmid: 17411434
references.citation: Science. 1964 Jan 24;143(3604):356-8
references.pmid: 17821056
references.citation: Macromol Biosci. 2009 May 13;9(5):464-71
references.pmid: 19040222
references.citation: C R Biol. 2009 Feb-Mar;332(2-3):140-8
references.pmid: 19281947
references.citation: Nature. 2011 Mar 3;471(7336):95-8
references.pmid: 21368831
references.citation: Integr Comp Biol. 2010 Aug;50(2):237-50
references.pmid: 21558202
references.citation: Integr Comp Biol. 2006 Aug;46(4):481-96
references.pmid: 21672760
references.citation: Mol Biol Evol. 2014 Jun;31(6):1391-401
references.pmid: 24567512
references.citation: J R Soc Interface. 2014 Sep 6;11(98):20140525
references.pmid: 25008085
references.citation: J Exp Biol. 2014 Jul 15;217(Pt 14):2548-54
references.pmid: 25031458
references.citation: Ann Rev Mar Sci. 2015;7:497-520
references.pmid: 25251269
references.citation: Evolution. 1987 Mar;41(2):427-432
references.pmid: 28568750
references.citation: Biol Bull. 1998 Feb;194(1):14-24
references.pmid: 28574792
references.citation: Stain Technol. 1983 Nov;58(6):347-51
references.pmid: 6679126