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Changes in Philornis Infestation Behavior Threaten Darwin's Finch Survival

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Changes in Philornis Infestation Behavior Threaten Darwin's Finch Survival Current Zoology 60 (4): 542–550, 2014 Changes in Philornis infestation behavior threaten Darwin’s finch survival Sonia KLEINDORFER1*, Katharina J. PETERS1, Georgina CUSTANCE1, Rachael Y. DUDANIEC2, Jody A. O’CONNOR1 1 School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide 5001, Australia 2 Department of Biology, Lund University, Sölvegatan 37, Lund, 22362, Sweden Abstract The conservation behavior framework is useful to identify key linkages between behavior and conservation practice. We apply this framework to a novel host-parasite system on the Galapagos Islands and ask if there have been changes in parasite oviposition behavior and host mortality patterns across the first decade (2004-2013) of its known association. The Dipteran para- site Philornis downsi was first discovered in Darwin’s finch nests in 1997 and is the biggest threat to the survival of Galapagos land birds. Host mortality has increased over the past decade. In Dipterans, pupation and pupae size are determined by access to host resources. Here, we test the hypothesis that P. d ow n s i flies are laying eggs in finch nests earlier in the nestling phase to maximize larval feeding time and therefore chance of pupation success before host death. The results show fewer 1st instar larvae later in the host nesting cycle in support of earlier egg laying behavior by female flies. Between 2004 and 2013, parasite intensity increased from ~28 to ~48 parasites per nest, host mortality increased from ~50% to ~90%, and host age at death decreased from ~11 to ~5 days. The earlier age at host death was correlated with fewer pupae (from ~50% to ~20%) and smaller pupae size (~10% decrease). Changes in parasite behavior reveal new fitness costs to both the parasite and Darwin’s finches. These findings un- derscore the need for urgent conservation action to save Darwin’s finches from extinction due to a novel, lethal and introduced parasite [Current Zoology 60 (4): 542–550, 2014]. Keywords Host mortality, Parasite size, Darwin’s finches, Ectoparasitism, Camarhynchus, Geospiza The conservation behavior framework (Berger-Tal et 2008; Murray et al., 2013; Thompson et al., 2010). al., 2011; Caro and Sherman, 2011) is useful to identify We use the conservation behaviour framework to ask key linkages between animal behavior and conservation if there have been changes in parasite behaviour that practice; it offers a hierarchical framework to bridge the impact host mortality in a novel host-parasite system on gap between the two disciplines of ethology and con- Floreana Island, Galapagos Archipelago. Specifically, servation biology. Three basic themes that link the two we seek to identify temporal changes in reproductive disciplines are identified: (1) anthropogenic impacts on behaviour that could threaten host species persistence or behavior that impact biodiversity, (2) behavior-based indicate altered parasite fitness since the onset of this species management, and (3) behavioral indicators of parasite invasion. Larvae of P. downsi were first dis- other processes of conservation concern (Berger-Tal et covered in Darwin’s finch nests on Santa Cruz Island in al., 2011; Brearley et al., 2013; Civitello et al., 2013; 1997 (Fessl and Tebbich, 2002) though the fly was Daly and Johnson, 2011). A range of questions follow present by 1964 (Causton et al., 2006). P. do wns i is on from this context. What anthropogenic changes have considered the biggest threat to the survival of all Gala- changed species behavior and fitness? What species- pagos land birds (Causton et al., 2011; Dvorak et al., specific behavior needs to be managed to enhance fit- 2011). The non-parasitic adult P. downsi fly lays its eggs ness? What behaviors signal that a species is experien- in nests of land birds (O'Connor et al., 2014; O'Connor cing a threat to its persistence? Because parasites can et al., 2010b). These eggs hatch into larvae that con- affect host phenotype, foraging behavior, and ecological sume the blood and tissue of developing chicks (Fessl et interactions (Britton, 2013; Crane et al., 2011; Good- al., 2006b; Fessl et al., 2006c; Koop et al., 2011; O'Connor man and Johnson, 2011; Houte et al., 2013), understand- et al., 2010a; O'Connor et al., 2010b), and in some ing the role of parasite behavior for host survival is key to instances the incubating female (Huber et al., 2010). In managing biodiversity (Edeline et al., 2008; McCallum, Darwin’s finch chicks, the larvae cause up to 50% blood Received April 15, 2014; accepted July 14, 2014. Corresponding author. E-mail: [email protected] © 2014 Current Zoology KLEINDORFER S et al.: Parasite behavior and Darwin’s finch conservation 543 loss (Fessl et al., 2006a), naris deformation (Galligan ary to April during the years 2004, 2006, 2008, 2010, and Kleindorfer, 2009), and between 17 and 100% mean 2012, 2013 on Floreana Island, Galapagos Archipelago annual mortality in chicks (Dudaniec et al., 2007; (described in Kleindorfer et al., 2014). The avian focal O'Connor et al., 2010b). From laboratory trials con- species are the common small tree finch Camarhynchus ducted on the Galapagos Islands, the minimum time for parvulus, the critically endangered medium tree finch C. P. downsi to complete larval development is 4 days until pauper, and the common small ground finch Geospiza pupation (Causton et al., 2011; O’Connor pers. observa- fuliginosa (Grant, 1986; O'Connor et al., 2010b; tion). There has been a trend for increased host mortali- O'Connor et al., 2010c; Sulloway and Kleindorfer, ty across the decade (Dudaniec et al., 2007; Huber, 2008; 2013). The highland study sites on Floreana Island were Koop et al., 2011; O'Connor et al., 2010b; O'Connor et in Scalesia forest at the base of Cerro Pajas volcano, al., 2010c; O'Connor et al., 2010d). which is the stronghold of the tree finch population on Understanding parasite behavior is key to under- Floreana Island (1°17′46″ S, 90°27′06″ W) (O'Connor et standing sources of selection for host and parasite (Pou- al., 2010a; O'Connor et al., 2010b; O'Connor et al., lin, 2011; Schmid-Hempel, 2011). In Dipterans, the 2010c). Darwin’s finches begin breeding with the onset duration of larval development is dependent on resource of the rains that usually occur around January or Febru- availability provided by the host. If the larvae have not ary. Males build a display nest and sing to attract a fe- consumed sufficient resources to complete development male (Kleindorfer, 2007b). Females visit the singing and the host dies, the larvae will either perish or be male and inspect the nest. If accepted, a female will forced to pupate sooner (Poulin, 2011; Schmid-Hempel, subsequently lay a clutch size of 2‒5 eggs per nest 2011). In addition to the time window for resource ac- (Kleindorfer, 2007a); some nests had 6 eggs in 2008 quisition, host resource availability determines pupae and 2010. In all three focal species, the female is the size: pupae are generally smaller under conditions of sole incubator and both parents provide food to chicks. low resource availability (Quiroga and Reboreda, 2013; The incubation and feeding phase are ~14 days each. Spalding et al., 2002; Teixeira, 1999). To increase re- The three focal species build domed shaped nests source availability, parasites may infest a host earlier in with a thick nest base that provides the nesting substrate the nesting cycle. Recently, Quiroga and Reboreda for larvae of the introduced parasite P. downsi (Klein- (2013) showed that the size of larvae and pupae in Phi- dorfer and Dudaniec, 2009). On Floreana Island, the lornis seguyi was correlated with adult fly size. In in- study sites were characterized by low annual rainfall sects, there is a wealth of data for the correlation be- (~500 mm) in 2004 and 2006, high annual rainfall tween small adult size and lower fecundity. In a com- (~1,500 mm) in 2008 and 2010, and moderate annual parative study of 57 oviparous insects, the common rainfall (~800 mm) in 2012 and 2013 (Kleindorfer et al., slope of the fecundity/size relationship was close to one 2014; Charles Darwin Foundation Meteorological Da- (Honěk, 1993). Therefore, P. do wn s i pupae size is a tabase: http://datazone.darwinfoundation.org/climate/). reliable proxy for adult size and fecundity. 1.2 Sample size This study examines possible changes in the timing We monitored nesting outcome at 561 active Darwin’s of parasite infestation by P. downsi in Darwin’s finch finch nests between 2004 and 2013 on Floreana Island. hosts on the Galapagos Islands between 2004 and 2013. The sample size per focal species was 139 small tree If the parasite is infesting host nests earlier during the finch, 196 medium tree finch, and 226 small ground st host nesting cycle, we predict fewer 1 instar larvae finch nests. We analyzed the following subsets of data later in the nesting cycle, more pupae, and larger pupae for this study: nests with P. downsi (238 nests), nests with size. Here we ask, is there evidence for (1) earlier P. data on percentage of 1st, 2nd, 3rd instar (88 nests), the downsi infestation during the nesting cycle of host nests, percentage of P. downsi pupae in relation to larvae (191 (2) increased pupae size as the result of longer larval nests), in-nest chick mortality (222 nests), chick age at development, and lastly (3) a correlation between earlier death (150 nests), pupae size (66 nests), pupae size and host mortality (i.e. nestling age), pupation success and chick age at death (39 nests). pupae size. 1.3 Parasite species: Background information 1 Materials and Methods Philornis downsi is a Dipteran parasitic fly that has a two-stage life-cycle, which is unusual for the genus: first 1.1 Study site and host species instar larvae feed internally on the nasal and body cavi- This study was conducted during the months Febru- ties of its avian nestling hosts, and 2nd and 3rd instar 544 Current Zoology Vol.
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