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A Bioturbation Classification of European Marine Infaunal

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A Bioturbation Classification of European Marine Infaunal A bioturbation classification of European marine infaunal invertebrates Ana M. Queiros 1, Silvana N. R. Birchenough2, Julie Bremner2, Jasmin A. Godbold3, Ruth E. Parker2, Alicia Romero-Ramirez4, Henning Reiss5,6, Martin Solan3, Paul J. Somerfield1, Carl Van Colen7, Gert Van Hoey8 & Stephen Widdicombe1 1Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, U.K. 2The Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road, Lowestoft, NR33 OHT, U.K. 3Department of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, U.K. 4EPOC – UMR5805, Universite Bordeaux 1- CNRS, Station Marine d’Arcachon, 2 Rue du Professeur Jolyet, Arcachon 33120, France 5Faculty of Biosciences and Aquaculture, University of Nordland, Postboks 1490, Bodø 8049, Norway 6Department for Marine Research, Senckenberg Gesellschaft fu¨ r Naturforschung, Su¨ dstrand 40, Wilhelmshaven 26382, Germany 7Marine Biology Research Group, Ghent University, Krijgslaan 281/S8, Ghent 9000, Belgium 8Bio-Environmental Research Group, Institute for Agriculture and Fisheries Research (ILVO-Fisheries), Ankerstraat 1, Ostend 8400, Belgium Keywords Abstract Biodiversity, biogeochemical, ecosystem function, functional group, good Bioturbation, the biogenic modification of sediments through particle rework- environmental status, Marine Strategy ing and burrow ventilation, is a key mediator of many important geochemical Framework Directive, process, trait. processes in marine systems. In situ quantification of bioturbation can be achieved in a myriad of ways, requiring expert knowledge, technology, and Correspondence resources not always available, and not feasible in some settings. Where dedi- Ana M. Queiros, Plymouth Marine cated research programmes do not exist, a practical alternative is the adoption Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, U.K. Tel: +44 1752 633 of a trait-based approach to estimate community bioturbation potential (BPc). 476; Fax: +44 1752 633 101; This index can be calculated from inventories of species, abundance and E-mail: [email protected] biomass data (routinely available for many systems), and a functional classifica- tion of organism traits associated with sediment mixing (less available). Pres- Funding Information ently, however, there is no agreed standard categorization for the reworking Funding was supported by the Western mode and mobility of benthic species. Based on information from the literature Channel Observatory, part of the UK Natural and expert opinion, we provide a functional classification for 1033 benthic Environmental Research Council’s National Capability (Queiros, Somerfield and invertebrate species from the northwest European continental shelf, as a tool to Widdicombe), the Department of the enable the standardized calculation of BPc in the region. Future uses of this Environment, Food and Rural Affairs under classification table will increase the comparability and utility of large-scale Science-Level Agreement SLA31 assessments of ecosystem processes and functioning influenced by bioturbation (Birchenough), the Conseil Regional (e.g., to support legislation). The key strengths, assumptions, and limitations of d’Aquitaine and the University of Bordeaux 1 BPc as a metric are critically reviewed, offering guidelines for its calculation and (Romero-Ramirez), and the Flemish Fund for application. Scientific Research (Van Colen). Received: 1 May 2013; Revised: 6 August 2013; Accepted: 12 August 2013 Ecology and Evolution 2013; 3(11): 3958– 3985 doi: 10.1002/ece3.769 Introduction terized by a high biomass and diversity of invertebrate organisms that are fundamental to the mediation of a Marine soft-sediment habitats represent some of the most wealth of goods and services (Lotze et al. 2006; White et al. functionally important ecosystems on Earth, being charac- 2010; Widdicombe and Somerfield 2012). Infaunal inverte- 3958 ª 2013 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. A.M. Queiros et al. Marine Invertebrate Bioturbation Classification brates exhibit significant influence over benthic sedimen- munity structure have previously been used to explore tary geochemical environments in soft sediments through possible changes in ecosystem properties like sediment bioturbation, that is, the mixing of sediment and particu- organic carbon at the North Sea scale, based on empiri- late materials carried out during foraging, feeding and bur- cally derived relationships between BPc and sediment row maintenance activities, and the enhancement of pore organic carbon (Fig. 1). Similar uses of BPc could invalu- water and solute advection during burrow ventilation ably contribute to an increased understanding of the role (Richter 1936; Rhoads 1974; Volkenborn et al. 2010). These of ecosystem structure in the sustenance of marine func- processes influence oxygen, pH and redox gradients (Stahl tioning and its resilience to human activities, an urgent et al. 2006; Pischedda et al. 2008; Queiros et al. 2011), metal need under current European legislation (Marine Strategy cycling (Teal et al. 2009), sediment granulometry (Mont- Framework Directive, 2008/56/EC). serrat et al. 2009), pollutant release (Gilbert et al. 1994), A significant obstacle in the widespread application of macrofauna diversity (Volkenborn et al. 2007), bacterial BPc, however, is the need for a standard classification activity and composition (Mermillod-Blondin and Rosen- scheme that is supported by the benthic research commu- berg 2006; Gilbertson et al. 2012), and ultimately carbon nity. As a first step in fulfilling this research gap, we pres- (Kristensen 2001) and nitrogen cycling (Bertics et al. 2010). ent the findings of the Study Group on Climate Related Hence, in light of anticipated changes to marine systems Benthic Processes in the North Sea, an expert group associated with human activity (Halpern et al. 2008; Hoe- appointed by the International Council for the Explora- gh-Guldberg and Bruno 2010), large-scale assessments of tion of the Sea (ICES SGCBNS). We present the conclu- bioturbation can contribute to a better understanding of how sions of a series of dedicated workshops tasked with of ecosystem functioning is mediated by biological activity. deriving a functional classification of northwest European Community bioturbation potential (BPc) is a metric marine invertebrate species to facilitate the calculation of first described by Solan et al. (2004a), which combines BPc in different regions of the North Atlantic. abundance and biomass data with information about the life traits of individual species or taxonomic groups. This Methods information describes modes of sediment reworking (Ri) The classification of marine invertebrate infauna into bio- and mobility (Mi) of taxa in a dataset, two traits known to regulate biological sediment mixing, a key component turbation groups was carried out using 18 datasets com- = of bioturbation (Solan 2000; and refereces therein; Solan piled from northwest European waters (n 1033 species). Following Swift (1993) and Solan et al. (2004a), each taxon et al. 2004b). BPc is thus not a direct measure of the (1) was scored on categorical scales that reflect increasing process of bioturbation. Rather, BPc provides an estimate of the potential of a community to bioturbate. Hence, mobility (Mi) from 1 (living in a fixed tube) to 4 (free three where macrofauna abundance and biomass data are dimensional movement via burrow system), and increasing available, BP provides a means to estimate the extent to sediment reworking (Ri) from 1 (epifauna that bioturbate c – which benthic communities are likely to affect important at the sediment water interface) to 5 (regenerators that exca- ecosystem properties that underpin ecosystem function- vate holes, transferring sediment at depth to the surface). ing. The consequences of environmentally driven changes Xn pffiffiffiffiffiffiffiffiffiffiffi BPc ¼ Bi=Ai  Ai  Mi  Ri in biodiversity to BPc, and its relation to ecosystem func- ¼ tioning, have been explored in this way in terrestrial (Bun- i 1 ker et al. 2005) and marine habitats (Solan et al. 2004a,b); Bi and Ai are the biomass and abundance of species/taxon i at the local (Lohrer et al. 2010; Teal et al. 2013) and regio- in a sample. Trait scores were derived from an extensive nal scales (Queiros et al. 2011; Birchenough et al. 2012; review of published material and expert knowledge (con- Solan et al. 2012); for different contexts (e.g., habitat sensus of 12 authors), and details of the scoring system are structure and hypoxia, Queiros et al. 2011; Van Colen provided below. Species for which no published informa- et al. 2012; Villn€as et al. 2012); and for a variety of ecosys- tion was available were scored based on descriptions of spe- tem functions including productivity (Solan et al. 2012), cies behavior and information on closely related species at nutrient cycling (Solan et al. 2004a), carbon storage (Bun- the nearest taxonomic level. As BPc captures information ker et al. 2005; Solan et al. 2012), and decomposition (Jo- about sediment particle reworking, pelagic species and sefson et al. 2012). By calculating BPc over time, or for those living on hard substrates were not included. Sedi- different locations or scenarios, changes in the efficiency
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