Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.

We report quantitative analyses of drilling predation on the free-living, tube-dwelling serpulid polychaete Ditrupa arietina from the Cope Cabo marine succession (Pliocene, Spain). Tubes of D. arietina are abundant in the sampled units: 9 bulk samples from 5 horizons yielded ~5925 specimens of D. ar...

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Autores principales:	Jordi Martinell, Michał Kowalewski, Rosa Domènech
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/23bde4bf5edc490db071618e19e0a864
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spelling	oai:doaj.org-article:23bde4bf5edc490db071618e19e0a8642021-11-18T07:23:07ZDrilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.1932-620310.1371/journal.pone.0034576https://doaj.org/article/23bde4bf5edc490db071618e19e0a8642012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22496828/?tool=EBIhttps://doaj.org/toc/1932-6203We report quantitative analyses of drilling predation on the free-living, tube-dwelling serpulid polychaete Ditrupa arietina from the Cope Cabo marine succession (Pliocene, Spain). Tubes of D. arietina are abundant in the sampled units: 9 bulk samples from 5 horizons yielded ~5925 specimens of D. arietina. Except for fragmentation, tubes were well preserved. Complete specimens ranged from 3.1 to 13.4 mm in length and displayed allometric growth patterns, with larger specimens being relatively slimmer. Drilled Ditrupa tubes were observed in all samples. Drillholes, identified as Oichnus paraboloides, were characterized by circular to elliptical outline (drillhole eccentricity increased with its diameter), parabolic vertical profile, outer diameter larger than inner diameter, penetration of one tube wall only, narrow range of drill-hole sizes, and non-random (anterior) distribution of drillholes. A total of 233 drilled specimens were identified, with drilling frequencies varying across horizons from 2.7% to 21% (3.9% for pooled data). Many tube fragments were broken across a drillhole suggesting that the reported frequencies are conservative and that biologically-facilitated (drill-hole induced) fragmentation hampers fossil preservation of complete serpulid tubes. No failed or repaired holes were observed. Multiple complete drillholes were present (3.9%). Drilled specimens were significantly smaller than undrilled specimens and tube length and drill-hole diameter were weakly correlated. The results suggest that drillholes were produced by a size-selective, site-stereotypic predatory organism of unknown affinity. The qualitative and quantitative patterns reported here are mostly consistent with previous reports on recent and fossil Ditrupa and reveal parallels with drilling patterns documented for scaphopod mollusks, a group that is ecologically and morphologically similar to Ditrupa. Consistent with previous studies, the results suggest that free-dwelling serpulid polychaetes are preyed upon by drilling predators and may provide a viable source of data on biotic interactions in the fossil record.Jordi MartinellMichał KowalewskiRosa DomènechPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 4, p e34576 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jordi Martinell Michał Kowalewski Rosa Domènech Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.
description	We report quantitative analyses of drilling predation on the free-living, tube-dwelling serpulid polychaete Ditrupa arietina from the Cope Cabo marine succession (Pliocene, Spain). Tubes of D. arietina are abundant in the sampled units: 9 bulk samples from 5 horizons yielded ~5925 specimens of D. arietina. Except for fragmentation, tubes were well preserved. Complete specimens ranged from 3.1 to 13.4 mm in length and displayed allometric growth patterns, with larger specimens being relatively slimmer. Drilled Ditrupa tubes were observed in all samples. Drillholes, identified as Oichnus paraboloides, were characterized by circular to elliptical outline (drillhole eccentricity increased with its diameter), parabolic vertical profile, outer diameter larger than inner diameter, penetration of one tube wall only, narrow range of drill-hole sizes, and non-random (anterior) distribution of drillholes. A total of 233 drilled specimens were identified, with drilling frequencies varying across horizons from 2.7% to 21% (3.9% for pooled data). Many tube fragments were broken across a drillhole suggesting that the reported frequencies are conservative and that biologically-facilitated (drill-hole induced) fragmentation hampers fossil preservation of complete serpulid tubes. No failed or repaired holes were observed. Multiple complete drillholes were present (3.9%). Drilled specimens were significantly smaller than undrilled specimens and tube length and drill-hole diameter were weakly correlated. The results suggest that drillholes were produced by a size-selective, site-stereotypic predatory organism of unknown affinity. The qualitative and quantitative patterns reported here are mostly consistent with previous reports on recent and fossil Ditrupa and reveal parallels with drilling patterns documented for scaphopod mollusks, a group that is ecologically and morphologically similar to Ditrupa. Consistent with previous studies, the results suggest that free-dwelling serpulid polychaetes are preyed upon by drilling predators and may provide a viable source of data on biotic interactions in the fossil record.
format	article
author	Jordi Martinell Michał Kowalewski Rosa Domènech
author_facet	Jordi Martinell Michał Kowalewski Rosa Domènech
author_sort	Jordi Martinell
title	Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.
title_short	Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.
title_full	Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.
title_fullStr	Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.
title_full_unstemmed	Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.
title_sort	drilling predation on serpulid polychaetes (ditrupa arietina) from the pliocene of the cope basin, murcia region, southeastern spain.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/23bde4bf5edc490db071618e19e0a864
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Drilling predation on serpulid polychaetes (Ditrupa arietina) from the pliocene of the Cope Basin, Murcia Region, Southeastern Spain.

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