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Feather Mites Play a Role in Cleaning Host Feathers: New Insights from DNA Metabarcoding and Microscopy

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Feather Mites Play a Role in Cleaning Host Feathers: New Insights from DNA Metabarcoding and Microscopy Received: 26 December 2017 | Revised: 15 February 2018 | Accepted: 21 March 2018 DOI: 10.1111/mec.14581 SPECIAL ISSUE: SPECIES INTERACTIONS, ECOLOGICAL NETWORKS AND COMMUNITY DYNAMICS Feather mites play a role in cleaning host feathers: New insights from DNA metabarcoding and microscopy Jorge Dona~ 1 | Heather Proctor2 | David Serrano3 | Kevin P. Johnson4 | Arnika Oddy-van Oploo2 | Jose C. Huguet-Tapia5 | Marina S. Ascunce5,6 | Roger Jovani1 1Department of Evolutionary Ecology, Estacion Biologica de Donana~ (EBD-CSIC), Abstract Sevilla, Spain Parasites and other symbionts are crucial components of ecosystems, regulating 2Department of Biological Sciences, host populations and supporting food webs. However, most symbiont systems, University of Alberta, Edmonton, AB, Canada especially those involving commensals and mutualists, are relatively poorly under- 3Department of Conservation Biology, stood. In this study, we have investigated the nature of the symbiotic relationship Estacion Biologica de Donana~ (EBD-CSIC), Sevilla, Spain between birds and their most abundant and diverse ectosymbionts: the vane-dwell- 4Illinois Natural History Survey, Prairie ing feather mites. For this purpose, we studied the diet of feather mites using two Research Institute, University of Illinois at complementary methods. First, we used light microscopy to examine the gut con- Urbana-Champaign, Champaign, Illinois 5Department of Plant Pathology, University tents of 1,300 individual feather mites representing 100 mite genera (18 families) of Florida, Gainesville, Florida from 190 bird species belonging to 72 families and 19 orders. Second, we used 6 Emerging Pathogens Institute, University high-throughput sequencing (HTS) and DNA metabarcoding to determine gut con- of Florida, Gainesville, Florida tents from 1,833 individual mites of 18 species inhabiting 18 bird species. Results Correspondence showed fungi and potentially bacteria as the main food resources for feather mites Jorge Dona~ and Roger Jovani, Department of Evolutionary Ecology, Estacion Biologica (apart from potential bird uropygial gland oil). Diatoms and plant matter appeared as ~ de Donana (EBD-CSIC), Sevilla, Spain. rare food resources for feather mites. Importantly, we did not find any evidence of Emails: [email protected] and [email protected] feather mites feeding upon bird resources (e.g., blood, skin) other than potentially and uropygial gland oil. In addition, we found a high prevalence of both keratinophilic Heather Proctor, Department of Biological Sciences, University of Alberta, Edmonton, and pathogenic fungal taxa in the feather mite species examined. Altogether, our AB, Canada. results shed light on the long-standing question of the nature of the relationship Email: [email protected] between birds and their vane-dwelling feather mites, supporting previous evidence Funding information for a commensalistic–mutualistic role of feather mites, which are revealed as likely Ministry of Economy and Competitiveness, Grant/Award Number: RYC-2009-03967, fungivore–microbivore–detritivore symbionts of bird feathers. CGL2011-24466, CGL2015-69650-P, SVP- 2013-067939; Natural Sciences and KEYWORDS Engineering Research Council of Canada bacteria, birds, diet, DNA metabarcoding, ecological interactions, feather mites, fungi, (NSERC); Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa high-throughput sequencing, interactions, symbionts Program for Centres of Excellence in R+D+I, Grant/Award Number: SEV-2012-0262 1 | INTRODUCTION Hechinger, & Jetz, 2008; Larsen, Miller, Rhodes, & Wiens, 2017; Poulin & Morand, 2000, 2004). Symbionts are crucial for ecosystem Symbionts (i.e., parasites, mutualists and commensalists that inti- stability: they regulate host populations and support food webs, mately interact with their hosts; Leung & Poulin, 2008) comprise the where parasites alone are responsible for 75% of the network links most diverse group of organisms on Earth (Dobson, Lafferty, Kuris, (Lafferty, Dobson, & Kuris, 2006). Thus, the study of host–symbiont | Molecular Ecology. 2019;28:203–218. wileyonlinelibrary.com/journal/mec © 2018 John Wiley & Sons Ltd 203 ~ 204 | DONA ET AL. ecology is vital to understand many important processes, such as tissues (e.g., feathers, skin, blood) or upon resources found on the emerging infectious diseases (Hoberg & Brooks, 2015), biological bird’s surface (e.g., algae, fungi). If they feed on bird tissues, they are invasions (Traveset & Richardson, 2014), crop pests (Hosokawa, more likely to be classified as parasites (Harper, 1999; Poulin, 1991; Kikuchi, Shimada, & Fukatsu, 2007) or the effect of climate change Thompson, Hillgarth, Leu, & McClure, 1997), while if they do not, upon biodiversity (Carlson et al., 2017). Historically, most efforts feather mites would more likely be commensals or even mutualists have been directed to the study of parasites with direct harmful (Blanco, Tella, & Potti, 1997; Blanco, Tella, Potti, & Baz, 2001; effects on humans or livestock. Symbiont systems involving com- Galvan et al., 2012). Previous evidence has suggested that feather mensals and mutualists are relatively poorly studied compared to mites could feed mainly on the uropygial gland oil of birds (Dubinin, free-living organisms and host–parasite systems (Jovani, Dona,~ Labra- 1951; Proctor, 2003; Walter & Proctor, 2013c). However, this oil is dor, & Serrano, 2017). a nitrogen-deficient source (Jacob & Ziswiler 1982; Proctor, 2003), Host–symbiont interactions rarely involve a simple one-symbiont: and previous evidence has shown that feather mites complement one-host interaction. Rather, even without considering the interaction their diet with fungi, pollen and algal particles (Blanco et al., 2001; of the host species with other free-living species, any host–symbiont Dubinin, 1951; Proctor, 2003; Walter & Proctor, 2013c). Examining interaction typically involves several other species (Hopkins, Wojdak, thousands of slide-mounted feather mites from 26 mite species, & Belden, 2017; Poulin, 2010). In addition, whether a particular sym- Dubinin (1951) found that almost all mite species had fungal spores biont species acts as a parasite, commensal or mutualist can be highly in their guts, most from Cladosporium, Alternaria and rust fungi. context-dependent (i.e., the mutualism–parasitism continuum frame- Moreover, Blanco et al. (2001) found fungal mycelia and spores in work; for example, Brown, Creed, Skelton, Rollins, & Farrell, 2012; the guts of 53% of Pterodectes rutilus (Robin) (Proctophyllodidae) and Cheney & Cot^ e 2005; Newton, Fitt, Atkins, Walters, & Daniell, 2010; 38% of Scutulanyssus nuntiaventris (Berlese) (Pteronyssidae) mites Jovani et al., 2017). Thus, the study of symbionts as a whole, and not from two species of swallows (Hirundinidae). Likely because of this separately according to the presumed nature of their relationships potential mixture of feather mite diet, a recent isotopic study (Stefan with their hosts, is needed (Jovani, 2003; Jovani et al., 2017). et al., 2015) of the diet of two feather mite species produced incon- Defensive mutualisms (i.e., those in which symbionts protect clusive results. Interestingly, however, this study showed a strong their hosts from natural enemies, which have been often perceived correlation between the isotopic carbon signatures among mites as biological curiosities) have been reviewed recently following this inhabiting the same individual host, and between the carbon signa- approach and placed into this framework (Hopkins et al., 2017). ture (but not the nitrogen signature) of feather mites and the blood Accordingly, defensive mutualisms, instead of being anecdotal host– of their individual bird host, thus suggesting that diet could be symbiont associations, have been revealed as diverse and common mainly based on shared host-associated resources, arguably preen associations in a wide range of plants and animal hosts from nearly gland oil (Stefan et al., 2015). Thus, it remains an open question to all habitats on the planet. Nonetheless, with a few exceptions, most what extent feather mites feed on uropygial oil or also upon other of the diversity of host–symbiont associations remains unexplored or bird tissues, whether exogenous resources, such as fungi and bacte- largely unstudied. ria, constitute an important food resource for these mites, and which A good example of our lack of knowledge of these interactions specific taxa are eaten by feather mites. involves symbiotic relationships between birds and their feather In this study, we investigated the diet of feather mites using two mites (Acariformes: Astigmata: Analgoidea and Pterolichoidea). These complementary methods. First, we used light microscopy to examine mites are the most abundant and diverse ectosymbionts of birds. feather mite gut contents under the microscope from a large sample Almost all bird species harbour species- or genus-specific feather of feather mites from ~ 200 bird species. Light microscopy allows mites (Dona,~ Proctor, Mironov, Serrano, & Jovani, 2016; Gaud & detection of feather fragments, fungi, plant material and algae that are Atyeo, 1996; Proctor, 2003). Feather mites are highly specialized refractory to the clearing and mounting media (see Materials and symbionts due to their (i) life cycle (i.e., they are permanent methods). In a second approach, for a smaller number of vane-dwelling ectosymbionts, Dabert & Mironov, 1999; Proctor, 2003); (ii) high mite species, we studied gut contents using high-throughput
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