A Trait Database for Marine Copepods

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A Trait Database for Marine Copepods Downloaded from orbit.dtu.dk on: Oct 09, 2021 A trait database for marine copepods Brun, Philipp Georg; Payne, Mark; Kiørboe, Thomas Published in: Earth System Science Data Link to article, DOI: 10.5194/essd-9-99-2017 Publication date: 2017 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Brun, P. G., Payne, M., & Kiørboe, T. (2017). A trait database for marine copepods. Earth System Science Data, 9(1), 99-113. https://doi.org/10.5194/essd-9-99-2017 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Earth Syst. Sci. Data, 9, 99–113, 2017 www.earth-syst-sci-data.net/9/99/2017/ doi:10.5194/essd-9-99-2017 © Author(s) 2017. CC Attribution 3.0 License. A trait database for marine copepods Philipp Brun, Mark R. Payne, and Thomas Kiørboe Centre for Ocean Life, National Institute of Aquatic Resources, Technical University of Denmark, Kavalergården 6, 2920 Charlottenlund, Denmark Correspondence to: Philipp Brun ([email protected]) Received: 12 July 2016 – Discussion started: 26 July 2016 Revised: 13 December 2016 – Accepted: 26 January 2017 – Published: 14 February 2017 Abstract. The trait-based approach is gaining increasing popularity in marine plankton ecology but the field urgently needs more and easier accessible trait data to advance. We compiled trait information on marine pelagic copepods, a major group of zooplankton, from the published literature and from experts and organized the data into a structured database. We collected 9306 records for 14 functional traits. Particular attention was given to body size, feeding mode, egg size, spawning strategy, respiration rate, and myelination (presence of nerve sheathing). Most records were reported at the species level, but some phylogenetically conserved traits, such as myelination, were reported at higher taxonomic levels, allowing the entire diversity of around 10 800 recognized marine copepod species to be covered with a few records. Aside from myelination, data coverage was highest for spawning strategy and body size, while information was more limited for quantitative traits related to repro- duction and physiology. The database may be used to investigate relationships between traits, to produce trait biogeographies, or to inform and validate trait-based marine ecosystem models. The data can be downloaded from PANGAEA, doi:10.1594/PANGAEA.862968. 1 Introduction emergence and ecosystem functions beyond the limits of ap- proaches purely based on taxonomic diversity (van Bodegom The trait-based approach is an increasingly popular frame- et al., 2014; Violle et al., 2014; Westoby et al., 2002). The work in ecology that aims to describe the structure and func- trait-based approach therefore not only advanced plant ecol- tion of communities or ecosystems in a simple way. It seeks ogy, but also facilitated the description of key ecosystem pro- to identify the main characteristics of organisms that con- cesses like carbon uptake and storage, and thus continues to trol their fitness (Litchman et al., 2013). Organisms must be push related fields like biogeochemistry and climate science successful in three main missions in order to thrive: feed- forward. ing, survival, and reproduction. Functional traits determine More recently, the trait-based approach has been adopted the outcome of one or several of those missions. in marine plankton ecology (Barton et al., 2013; Litchman Functional traits are generally understood as heritable and Klausmeier, 2008; Litchman et al., 2013). One key group properties of the individual that are interrelated through of marine zooplankton, for which traits and trade-offs are rel- trade-offs and selected by the environment. Furthermore, a atively well understood, is copepods (Kiørboe, 2011). These criterion of measurability appears useful: traits should be ubiquitous crustaceans typically dominate the biomass of measurable on the individual without any assisting informa- zooplankton communities (Verity and Smetacek, 1996), play tion (Violle et al., 2007). We therefore consider, for example, a central role in marine food webs, and affect the global car- “feeding mode” to be a functional trait, but not “preferred bon cycle (Jónasdóttir et al., 2015). habitat”, as it depends on the characterization of the environ- We focus here on a set of 14 commonly described func- ment in which an individual occurs. tional traits for marine copepods, for which data are avail- The trait-based approach has been of great value in plant able (Fig. 1). The set includes one trait affecting all life ecology. Studying the spatiotemporal variation of traits in missions, three feeding-related, six growth-related, and three plant communities has permitted insights into community Published by Copernicus Publications. 100 P. Brun et al.: A trait database for marine copepods Body size Morphological Egg size Myelination Clearance rate Growth rate Respiration rate Physiological Ingestion rate Feeding mode type Behavioral rait Spawning Hibernation T strategy Resting eggs Development Life history duration Clutch size Fecundity Feeding Growth & Survival reproduction Ecological function Figure 1. Copepod traits included in the database, arranged according to the framework of Litchman et al. (2013). The vertical axis groups traits by trait type and the horizontal axis by ecological function. Body size (bold) transcends several functions. reproduction-related traits. Body size affects all life missions oxygen consumed per unit time; hibernation, which allows since it is related to several essential properties including individuals to endure adverse conditions over seasonal time metabolism, feeding, growth, mortality, mobility, and prey frames; and resting eggs, which can endure adverse condi- size (Litchman et al., 2013). Feeding-related traits include tions over several decades (Williams-Howze, 1997). clearance rate, i.e., the effective volume of water cleared for Here, we followed a recent call for efforts to collect trait prey items per unit of time when the prey concentration is data for plankton (Barton et al., 2013) and established a low (Kiørboe and Hirst, 2014); maximum ingestion rate – database for the 14 copepod traits introduced above. We the feeding rate at non-limiting food concentration (Kiør- screened the literature for information on marine copepods, boe and Hirst, 2014); and feeding mode (behavior) (Kiørboe, mainly pelagic taxa. Particular attention was given to the 2011). For the latter, the following behaviors are separated: trait body size, feeding mode, egg size, spawning strategy, ambush-feeding copepods remain largely immobile and wait myelination, and respiration rate, for some of which we have for approaching prey; cruise-feeding copepods move actively examined the biogeography elsewhere (Brun et al., 2016a). through the water in search of prey; feeding-current feeders We present data coverage as well as trait distributions for produce a current by beating their appendages and capture the most important pelagic copepod families and discuss entrapped prey; particle-feeding copepods colonize large ag- data collection methods as well as limitations. The data can gregates of marine snow on which they feed for extended be found on PANGAEA: doi:10.1594/PANGAEA.862968 periods; and parasites colonize larger hosts, such as fish, (Brun et al., 2016b). from which they feed. Growth-related traits include maxi- mum growth rate (the maximum amount of body mass gained per unit time) and development duration at non-limiting food 2 Data availability. Reproductive traits include spawning strategy, 2.1 Origin of data which distinguishes between free spawners that release their eggs into the water, and sac spawners that carry their eggs Our data consist primarily of material from previous data until hatching; egg size; clutch size (eggs produced in one compilations on individual traits, complemented by infor- “spawning event”), and fecundity (the number of eggs pro- mation from the primary literature and expert judgements. duced over the life-time of a female). Finally, the traits re- In total 91 references were consulted, with a few sources lated to survival are myelination (the insulation of nerve contributing the majority of the data (Table 1). The primary tracts with membranous tissue, which greatly enhances the literature was screened mainly for information on the focal speed of signal transmission and allows rapid response to traits of body size, feeding mode, egg size, spawning strat- predators; Lenz et al., 2000); respiration rate, the volume of egy, and respiration rate. For feeding mode, we also used ex- Earth Syst. Sci. Data, 9, 99–113, 2017 www.earth-syst-sci-data.net/9/99/2017/ P. Brun et al.: A trait database for marine copepods 101 pert judgement: feeding modes have been described in the lit- sex, and life stage,
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