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Reproductive Isolation Between Two Darter Species Is Enhanced and Asymmetric in Sympatry

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Reproductive Isolation Between Two Darter Species Is Enhanced and Asymmetric in Sympatry Journal of Fish Biology (2014) 84, 1389–1400 doi:10.1111/jfb.12364, available online at wileyonlinelibrary.com Reproductive isolation between two darter species is enhanced and asymmetric in sympatry M. Zhou* and R. C. Fuller Shelford Vivarium, 606 E. Healey St., Champaign, IL 61820, U.S.A. (Received 28 August 2013, Accepted 30 January 2014) Robust reproductive isolation was found between the rainbow darter Etheostoma caeruleum and the orangethroat darter Etheostoma spectabile, as more offspring were produced when conspecific males and females were crossed as compared with heterospecific crosses. Furthermore, fewer eggs resulted from heterospecific crosses involving sympatric E. spectabile females than those using allopatric E. spectabile females, while a similar pattern was not observed in heterospecific crosses using E. caeruleum females. These results suggest that reinforcement, i.e. selection for pre-zygotic reproductive barriers driven by reduced hybrid fitness, may have contributed to the evolution and maintenance of reproductive barriers between these potentially hybridizing species in sympatry. © 2014 The Fisheries Society of the British Isles Key words: behavioural isolation; Etheostoma caeruleum; Etheostoma spectabile: hybridization; orangethroat darter; rainbow darter. INTRODUCTION Increased avoidance of heterospecific mating in sympatry, i.e. heightened premating isolation, has been documented across a variety of animal and plant taxa, suggesting it may be widespread (Butlin, 1987, 1989; Coyne & Orr, 1989; Howard, 1993). This pattern has generally been attributed to reinforcement, wherein pre-zygotic reproduc- tive barriers are strengthened by natural selection against heterospecific mating, due to the cost of producing unfit hybrid offspring. Reinforcement is of much interest in evolutionary biology because it provides a mechanism by which natural selection can directly drive speciation (Dobzhansky, 1940; Blair, 1955; Servedio & Noor, 2003). Although the role of reinforcement in speciation has been historically controversial, it is supported by a growing body of theoretical and empirical research (Noor, 1995; Rundle & Schluter, 1998; Nosil et al., 2003; Jaenike et al., 2006; Nosil & Yukilevich, 2008; Lemmon & Lemmon, 2010; Matute, 2010). With regard to reinforcement as a process of speciation, the populations of related species in sympatry must be capable of producing fertile hybrids (Butlin 1987, 1989). If there is no possibility of gene flow between them, speciation would already be complete and reinforcement cannot occur. Among vertebrates, teleosts potentially represent fruitful subjects for the study of reinforcement because particularly high frequencies of natural hybridization have been *Author to whom correspondence should be addressed. Tel.:+1 812 3259244; email: [email protected] 1389 © 2014 The Fisheries Society of the British Isles 1390 M. ZHOU AND R. C. FULLER reported in many clades (Hubbs, 1958; Schwartz, 1972; Scribner et al., 2001). For example, reinforcement may have contributed to the divergence of benthic and lim- netic three-spined sticklebacks Gasterosteus aculeatus L. 1758: mating preferences for conspecifics are more pronounced in sympatric populations of benthics and limnet- ics than in allopatric populations (Rundle & Schluter, 1998), and benthic–limnetic F1 hybrid males are fertile, but less able to compete for females than the parental species (Vamosi & Schluter, 1999). Darters (Percidae: Etheostomatinae) are among the most diverse groups of freshwa- ter fishes in North America, containing > 200 species as well as numerous sub-species and geographic races (Page, 1983). In Mendelson (2003), multiple reproductive isolat- ing barriers and genetic distance were measured between 13 pairs of darter species, and behavioural isolation was found to have evolved faster and occasionally to completion. In contrast, post-zygotic isolating barriers have evolved more slowly and remained incomplete (i.e. F1 hybrids have non-zero fitness). Additionally in Mendelson et al. (2007), behavioural isolation between the Christmas darter Etheostoma hopkinsi (Fowler 1945) and the redband darter Etheostoma luteovinctum Gilbert & Swain 1887 was stronger than pre-zygotic post-mating barriers such as gametic incompatibility (i.e. egg–sperm incompatibility). These data suggest that the evolution of pre-mating or behavioural isolation has played an important role in darter speciation. Reinforce- ment as a possible factor in darter speciation, however, has received little attention. Darter speciation is thought to have been mainly allopatric, based on the generally non-overlapping distribution pattern of sister species pairs (Wiley & Mayden, 1985; Near et al., 2000, 2011; Page et al., 2003). Nevertheless, many darter species occur in sympatry and natural hybridization has been widely documented (Keck & Near, 2009). Given that reproductive isolation between darter species is often incomplete, where species occur in sympatry, there is the potential for heterospecific mating and the strengthening of behavioural isolation by reinforcement. The rainbow darter Etheostoma caeruleum Storer 1845 and the orangethroat darter Etheostoma spectabile (Agassiz 1854) are common species with wide, partially over- lapping distributions in the eastern U. S. A. They are similar in morphology, behaviour and ecology, and often co-occur in sympatric streams (Winn, 1958; Page, 1983). The two species have the same mating system: during the breeding season, gravid females are followed by males, who attempt to guard them against conspecific rivals. The female buries herself shallowly in the substratum when she is ready to spawn; eggs and sperms are released upon the attendance of a male. Neither territoriality nor parental care is exhibited by these species (Winn, 1958). Bright bluish and reddish breeding colouration is expressed by male E. caeruleum and E. spectabile, differing primarily in the presence or absence of red on the anal fin (Page, 1983); there is little evidence that male breeding colouration is attractive to females in either species (Pyron, 1995; Fuller, 2003). Instead, breeding colouration may be involved in male–male competition and species discrimination. Etheostoma caeruleum and E. spectabile are members of separate clades within the sub-genus Oligocephalus (Lang & Mayden, 2007). On the basis of museum and lit- erature records, E. caeruleum and E. spectabile are the darter species most likely to hybridize with other darters, and E. caeruleum–E. spectabile hybrids are the most common type of natural darter hybrid (Keck & Near, 2009). Furthermore, the entire mitochondrial genome of the current darter Etheostoma uniporum Distler 1968, a mem- ber of the E. spectabile clade, has been replaced by that of E. caeruleum (Ray et al., © 2014 The Fisheries Society of the British Isles, Journal of Fish Biology 2014, 84, 1389–1400 ENHANCED REPRODUCTIVE ISOLATION IN SYMPATRY 1391 2008; Bossu & Near, 2009). Thus there is gene flow between the E. caeruleum and E. spectabile lineages, and consequently the potential for reinforcement to have affected the evolution of behavioural isolation between these species. In this study, a series of spawning trials were conducted with E. caeruleum and E. spectabile,soasto(1) determine the extent of reproductive isolation between these species and (2) look for evidence of reinforcement by comparing the strength of isolation between sympatric and allopatric populations. MATERIALS AND METHODS Fishes were caught by kick-seine (net dimensions 106 cm × 122 cm, mesh size 3 mm) in April and May 2011, during the breeding season of E. caeruleum and E. spectabile. The sympatric site for E. caeruleum and E. spectabile was a small tributary of the Salt Fork River (Cham- paign Co., IL; 40⋅06∘ N; 88⋅089∘ W). The allopatric sites for E. caeruleum and E. spectabile were Prairieville Creek (Barry Co., MI; 42⋅426∘ N; 85⋅428∘ W) and Kaskaskia Creek (Cham- paign Co., IL; 40⋅141∘ N; 88⋅344∘ W). Although the sympatric and allopatric E. spectabile sites are geographically close to one another, they occur in distinct river drainages: the sym- patric site is in the Vermillion–Wabash–Ohio River drainage, and the allopatric site is in the Kaskaskia–Mississippi River drainage. All three sites are narrow (width: <3 m), shallow (depth: <1 m) streams with riffles over mixed sand and gravel substrata (typical grain diameter ranging from < 1 to 30 mm). The spawning trials were conducted in a no-choice format, in which a single male was paired with a single female. This protocol is often employed in studies of pre-zygotic isolation (Noor, 1995; Hatfield & Schluter, 1996; Rundle & Schluter, 1998). A spawning trial consisted ofa male and a female being placed in a 38 l aquarium with gravel substratum for 7 days, during which they were allowed to interact freely. No fish was used for more than one trial. Two sets of trials were performed, one using fish from the sympatric populations and the other usingfish from the allopatric populations. For each set, there were two conspecific and two heterospecific crosses (♀ E. caeruleum × ♂ caeruleum, ♀ E. spectabile × ♂ E. spectabile, ♀ E. caeruleum × ♂ E. spectabile, ♀ E. spectabile × ♂ E. caeruleum), with each cross replicated four to five times. The experiment thus involved 36 spawning trials divided between eight treatments. The aquaria were kept at 19 ∘ C, under a 14 L:10D cycle. The fishes were fed daily with frozen chironomid larvae; feeding took place after egg collection and followed the
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