@article{riesch_tobler_lerp_jourdan_doumas_nosil_langerhans_plath_2016, title={Extremophile Poeciliidae: multivariate insights into the complexity of speciation along replicated ecological gradients}, volume={16}, ISSN={["1471-2148"]}, DOI={10.1186/s12862-016-0705-1}, abstractNote={Replicate population pairs that diverge in response to similar selective regimes allow for an investigation of (a) whether phenotypic traits diverge in a similar and predictable fashion, (b) whether there is gradual variation in phenotypic divergence reflecting variation in the strength of natural selection among populations, (c) whether the extent of this divergence is correlated between multiple character suites (i.e., concerted evolution), and (d) whether gradual variation in phenotypic divergence predicts the degree of reproductive isolation, pointing towards a role for adaptation as a driver of (ecological) speciation. Here, we use poeciliid fishes of the genera Gambusia and Poecilia that have repeatedly evolved extremophile lineages able to tolerate high and sustained levels of toxic hydrogen sulfide (H2S) to answer these questions. We investigated evolutionary divergence in response to H2S in Gambusia spp. (and to a lesser extent Poecilia spp.) using a multivariate approach considering the interplay of life history, body shape, and population genetics (nuclear miscrosatellites to infer population genetic differentiation as a proxy for reproductive isolation). We uncovered both shared and unique patterns of evolution: most extremophile Gambusia predictably evolved larger heads and offspring size, matching a priori predictions for adaptation to sulfidic waters, while variation in adult life histories was idiosyncratic. When investigating patterns for both genera (Gambusia and Poecilia), we found that divergence in offspring-related life histories and body shape were positively correlated across populations, but evidence for individual-level associations between the two character suites was limited, suggesting that genetic linkage, developmental interdependencies, or pleiotropic effects do not explain patterns of concerted evolution. We further found that phenotypic divergence was positively correlated with both environmental H2S-concentration and neutral genetic differentiation (a proxy for gene flow). Our results suggest that higher toxicity exerts stronger selection, and that divergent selection appears to constrain gene flow, supporting a scenario of ecological speciation. Nonetheless, progress toward ecological speciation was variable, partially reflecting variation in the strength of divergent selection, highlighting the complexity of selective regimes even in natural systems that are seemingly governed by a single, strong selective agent.}, journal={BMC EVOLUTIONARY BIOLOGY}, author={Riesch, Rudiger and Tobler, Michael and Lerp, Hannes and Jourdan, Jonas and Doumas, Tess and Nosil, Patrik and Langerhans, R. Brian and Plath, Martin}, year={2016}, month={Jun} }
 @article{riesch_plath_schlupp_tobler_langerhans_2014, title={Colonisation of toxic environments drives predictable life-history evolution in livebearing fishes (Poeciliidae)}, volume={17}, ISSN={["1461-0248"]}, DOI={10.1111/ele.12209}, abstractNote={AbstractNew World livebearing fishes (family Poeciliidae) have repeatedly colonised toxic, hydrogen sulphide‐rich waters across their natural distribution. Physiological considerations and life‐history theory predict that these adverse conditions should favour the evolution of larger offspring. Here, we examined nine poeciliid species that independently colonised toxic environments, and show that these fishes have indeed repeatedly evolved much larger offspring size at birth in sulphidic waters, thus uncovering a widespread pattern of predictable evolution. However, a second pattern, only indirectly predicted by theory, proved additionally common: a reduction in the number of offspring carried per clutch (i.e. lower fecundity). Our analyses reveal that this secondary pattern represents a mere consequence of a classic life‐history trade‐off combined with strong selection on offspring size alone. With such strong natural selection in extreme environments, extremophile organisms may commonly exhibit multivariate phenotypic shifts even though not all diverging traits necessarily represent adaptations to the extreme conditions.}, number={1}, journal={ECOLOGY LETTERS}, author={Riesch, Ruediger and Plath, Martin and Schlupp, Ingo and Tobler, Michael and Langerhans, R. Brian}, year={2014}, month={Jan}, pages={65–71} }
 @article{martin_riesch_heinen-kay_langerhans_2014, title={EVOLUTION OF MALE COLORATION DURING A POST-PLEISTOCENE RADIATION OF BAHAMAS MOSQUITOFISH (GAMBUSIA HUBBSI)}, volume={68}, ISSN={["1558-5646"]}, DOI={10.1111/evo.12277}, abstractNote={Sexual signal evolution can be complex because multiple factors influence the production, transmission, and reception of sexual signals, as well as receivers’ responses to them. To grasp the relative importance of these factors in generating signal diversity, we must simultaneously investigate multiple selective agents and signaling traits within a natural system. We use the model system of the radiation of Bahamas mosquitofish (Gambusia hubbsi) inhabiting blue holes to test the effects of resource availability, male body size and other life‐history traits, key aspects of the transmission environment, sex ratio, and predation risk on variation in multiple male color traits. Consistent with previous work examining other traits in this system, several color traits have repeatedly diverged between predation regimes, exhibiting greater elaboration in the absence of predators. However, other factors proved influential as well, with variation in resource levels, body size, relative testes size, and background water color being especially important for several color traits. For one prominent signaling trait, orange dorsal fins, we further confirmed a genetic basis underlying population differences using a laboratory common‐garden experiment. We illustrate a promising approach for gaining a detailed understanding of the many contributing factors in the evolution of multivariate sexual signals.}, number={2}, journal={EVOLUTION}, author={Martin, Ryan A. and Riesch, Ruediger and Heinen-Kay, Justa L. and Langerhans, R. Brian}, year={2014}, month={Feb}, pages={397–411} }
 @article{plath_pfenninger_lerp_riesch_eschenbrenner_slattery_bierbach_herrmann_schulte_arias-rodriguez_et al._2013, title={Genetic differentiation and selection against migrants in evolutionarily replicated extreme environments}, volume={67}, number={9}, journal={Evolution}, author={Plath, M. and Pfenninger, M. and Lerp, H. and Riesch, R. and Eschenbrenner, C. and Slattery, P. A. and Bierbach, D. and Herrmann, N. and Schulte, M. and Arias-Rodriguez, L. and et al.}, year={2013}, pages={2647–2661} }
 @article{langerhans_riesch_2013, title={Speciation by selection: A framework for understanding ecology's role in speciation}, volume={59}, ISSN={["2396-9814"]}, DOI={10.1093/czoolo/59.1.31}, abstractNote={Abstract
               Speciation research during the last several decades has confirmed that natural selection frequently drives the generation of new species. But how does this process generally unfold in nature? We argue that answering this question requires a clearer conceptual framework for understanding selection’s role in speciation. We present a unified framework of speciation, providing mechanistic descriptions of fundamentally distinct routes to speciation, and how these may interact during lineage splitting. Two major categories are recognized: reproductive isolation resulting from (1) responses to selection, “speciation by selection,” or (2) non-selective processes, “speciation without selection.” Speciation by selection can occur via three mechanisms: (1) similar selection, (2) divergent selection, and (3) reinforcement selection. Understanding ecology’s role in speciation requires uncovering how these three mechanisms contribute to reproductive isolation, and their relative importance compared to non-selective processes, because all three mechanisms can occur side-by-side during speciation. To accomplish this, we highlight examination of groups of organisms inhabiting replicated environmental gradients. This scenario is common in nature, and a large literature illustrates that both parallel and non-parallel responses to similar environments are widespread, and each can result in speciation. This recognition reveals four general pathways of speciation by similar or divergent selection—parallel and nonparallel responses to similar and divergent selection. Altogether, we present a more precise framework for speciation research, draw attention to some under-recognized features of speciation, emphasize the multidimensionality of speciation, reveal limitations of some previous tests and descriptions of speciation mechanisms, and point to a number of directions for future investigation.}, number={1}, journal={CURRENT ZOOLOGY}, author={Langerhans, R. Brian and Riesch, Ruediger}, year={2013}, pages={31–52} }
 @article{schlupp_colston_joachim_riesch_2013, title={Translocation of cave fish (Poecilia mexicana) within and between natural habitats along a toxicity gradient}, volume={22}, number={2}, journal={Ecology of Freshwater Fish}, author={Schlupp, I. and Colston, T. J. and Joachim, B. L. and Riesch, R.}, year={2013}, pages={228–233} }
 @article{riesch_plath_makowicz_schlupp_2012, title={Behavioural and life-history regulation in a unisexual/bisexual mating system: does male mate choice affect female reproductive life histories?}, volume={106}, number={3}, journal={Biological Journal of the Linnean Society}, author={Riesch, R. and Plath, M. and Makowicz, A. M. and Schlupp, I.}, year={2012}, pages={598–606} }
 @misc{riesch_barrett-lennard_ellis_ford_deecke_2012, title={Cultural traditions and the evolution of reproductive isolation: ecological speciation in killer whales?}, volume={106}, number={1}, journal={Biological Journal of the Linnean Society}, author={Riesch, R. and Barrett-Lennard, L. G. and Ellis, G. M. and Ford, J. K. B. and Deecke, V. B.}, year={2012}, pages={1–17} }
 @article{girndt_riesch_schroder_sehlupp_plath_tiedemann_2012, title={Multiple paternity in different populations of the sailfin molly, Poecilia latipinna}, volume={62}, number={3}, journal={Animal Biology}, author={Girndt, A. and Riesch, R. and Schroder, C. and Sehlupp, I. and Plath, M. and Tiedemann, R.}, year={2012}, pages={245–262} }
 @article{riesch_martin_langerhans_2013, title={Predation's Role in Life-History Evolution of a Livebearing Fish and a Test of the Trexler-DeAngelis Model of Maternal Provisioning}, volume={181}, ISSN={["1537-5323"]}, DOI={10.1086/668597}, abstractNote={Populations experiencing consistent differences in predation risk and resource availability are expected to follow divergent evolutionary trajectories. For example, live-history theory makes specific predictions for how predation should drive life-history evolution, and according to the Trexler-DeAngelis model for the evolution of matrotrophy, postfertilization maternal provisioning is most likely to evolve in environments with consistent, high levels of resource availability. Using the model system of Bahamas mosquitofish (Gambusia hubbsi) inhabiting blue holes with and without the piscivorous bigmouth sleeper (Gobiomorus dormitor), we provide some of the strongest tests of these predictions to date, as resource availability does not covary with predation regime in this system, and we examine numerous (14) isolated natural populations. We found clear evidence for the expected life-history divergence between predation regimes and empirical support of the Trexler-DeAngelis model. Moreover, based on molecular and lab-rearing data, our study offers strong evidence for convergent evolution of similar life histories in similar predation regimes, largely matching previous phenotypic patterns observed in other poeciliid lineages (Brachyrhaphis spp., Poecilia reticulata), and further supports the notion that matrotrophy is most likely to evolve in stable high-resource environments.}, number={1}, journal={AMERICAN NATURALIST}, author={Riesch, Ruediger and Martin, Ryan A. and Langerhans, R. Brian}, year={2013}, month={Jan}, pages={78–93} }
 @article{carnes_riesch_schlupp_2012, title={The delayed impact of parental age on offspring mortality in mice}, volume={67}, number={4}, journal={Journals of Gerontology. Series A, Biological Sciences Medical Sciences}, author={Carnes, B. A. and Riesch, R. and Schlupp, I.}, year={2012}, pages={351–357} }
 @article{riesch_plath_schlupp_2012, title={The offspring size/fecundity trade-off and female fitness in the Atlantic molly (Poecilia mexicana, Poeciliidae)}, volume={94}, number={2}, journal={Environmental Biology of Fishes}, author={Riesch, R. and Plath, M. and Schlupp, I.}, year={2012}, pages={457–463} }
 @article{slattery_eschenbrenner_arias-rodriguez_streit_bierbach_riesch_tobler_pfenninger_feldmeyer_plath_et al._2012, title={Twelve new microsatellite loci for the sulphur molly (Poecilia sulphuraria) and the related Atlantic molly (P-mexicana)}, volume={4}, number={4}, journal={Conservation Genetics Resources}, author={Slattery, P. and Eschenbrenner, C. and Arias-Rodriguez, L. and Streit, B. and Bierbach, D. and Riesch, R. and Tobler, M. and Pfenninger, M. and Feldmeyer, B. and Plath, M. and et al.}, year={2012}, pages={935–937} }
 @article{kohler_hildenbrand_schleucher_riesch_arias-rodriguez_streit_plath_2011, title={Effects of male sexual harassment on female time budgets, feeding behavior, and metabolic rates in a tropical livebearing fish (Poecilia mexicana)}, volume={65}, number={8}, journal={Behavioral Ecology and Sociobiology}, author={Kohler, A. and Hildenbrand, P. and Schleucher, E. and Riesch, R. and Arias-Rodriguez, L. and Streit, B. and Plath, M.}, year={2011}, pages={1513–1523} }
 @article{plath_riesch_culumber_streit_tobler_2011, title={Giant water bug (Belostoma sp.) predation on a cave fish (Poecilia mexicana): effects of female body size and gestational state}, volume={13}, number={2}, journal={Evolutionary Ecology Research}, author={Plath, M. and Riesch, R. and Culumber, Z. and Streit, B. and Tobler, M.}, year={2011}, pages={133–144} }
 @article{mccoy_syska_plath_schlupp_riesch_2011, title={Mustached males in a tropical poeciliid fish: Emerging female preference selects for a novel male trait}, volume={65}, number={7}, journal={Behavioral Ecology and Sociobiology}, author={McCoy, E. and Syska, N. and Plath, M. and Schlupp, I. and Riesch, R.}, year={2011}, pages={1437–1445} }
 @article{bierbach_schulte_herrmann_tobler_stadler_jung_kunkel_riesch_klaus_ziege_et al._2011, title={Predator-induced changes of female mating preferences: innate and experiential effects}, volume={11}, journal={BMC Evolutionary Biology}, author={Bierbach, D. and Schulte, M. and Herrmann, N. and Tobler, M. and Stadler, S. and Jung, C. T. and Kunkel, B. and Riesch, R. and Klaus, S. and Ziege, M. and et al.}, year={2011} }
 @article{riesch_schlupp_langerhans_plath_2011, title={Shared and Unique Patterns of Embryo Development in Extremophile Poeciliids}, volume={6}, ISSN={["1932-6203"]}, DOI={10.1371/journal.pone.0027377}, abstractNote={Background Closely related lineages of livebearing fishes have independently adapted to two extreme environmental factors: toxic hydrogen sulphide (H2S) and perpetual darkness. Previous work has demonstrated in adult specimens that fish from these extreme habitats convergently evolved drastically increased head and offspring size, while cave fish are further characterized by reduced pigmentation and eye size. Here, we traced the development of these (and other) divergent traits in embryos of Poecilia mexicana from benign surface habitats (“surface mollies”) and a sulphidic cave (“cave mollies”), as well as in embryos of the sister taxon, Poecilia sulphuraria from a sulphidic surface spring (“sulphur mollies”). We asked at which points during development changes in the timing of the involved processes (i.e., heterochrony) would be detectible. Methods and Results Data were extracted from digital photographs taken of representative embryos for each stage of development and each type of molly. Embryo mass decreased in convergent fashion, but we found patterns of embryonic fat content and ovum/embryo diameter to be divergent among all three types of mollies. The intensity of yellow colouration of the yolk (a proxy for carotenoid content) was significantly lower in cave mollies throughout development. Moreover, while relative head size decreased through development in surface mollies, it increased in both types of extremophile mollies, and eye growth was arrested in mid-stage embryos of cave mollies but not in surface or sulphur mollies. Conclusion Our results clearly demonstrate that even among sister taxa convergence in phenotypic traits is not always achieved by the same processes during embryo development. Furthermore, teleost development is crucially dependent on sufficient carotenoid stores in the yolk, and so we discuss how the apparent ability of cave mollies to overcome this carotenoid-dependency may represent another potential mechanism explaining the lack of gene flow between surface and cave mollies.}, number={11}, journal={PLOS ONE}, author={Riesch, Ruediger and Schlupp, Ingo and Langerhans, R. Brian and Plath, Martin}, year={2011}, month={Nov} }
 @article{riesch_plath_schlupp_2011, title={Speciation in caves: Experimental evidence that permanent darkness promotes reproductive isolation}, volume={7}, number={6}, journal={Biology Letters}, author={Riesch, R. and Plath, M. and Schlupp, I.}, year={2011}, pages={909–912} }
 @article{riesch_plath_schlupp_2011, title={Toxic hydrogen sulphide and dark caves: Pronounced male life-history divergence among locally adapted Poecilia mexicana (Poeciliidae)}, volume={24}, number={3}, journal={Journal of Evolutionary Biology}, author={Riesch, R. and Plath, M. and Schlupp, I.}, year={2011}, pages={596–606} }
 @article{riesch_deecke_2011, title={Whistle communication in mammal-eating killer whales (Orcinus orca): further evidence for acoustic divergence between ecotypes}, volume={65}, number={7}, journal={Behavioral Ecology and Sociobiology}, author={Riesch, R. and Deecke, V. B.}, year={2011}, pages={1377–1387} }