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Jirik KJ, Dominguez JA, Abdulkarim I, Glaaser J, Stoian ES, Almanza LJ, Lee N. Parasitoid-host eavesdropping reveals temperature coupling of preferences to communication signals without genetic coupling. Proc Biol Sci 2023; 290:20230775. [PMID: 37583323 PMCID: PMC10427829 DOI: 10.1098/rspb.2023.0775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 07/24/2023] [Indexed: 08/17/2023] Open
Abstract
Receivers of acoustic communication signals evaluate signal features to identify conspecifics. Changes in the ambient temperature can alter these features, rendering species recognition a challenge. To maintain effective communication, temperature coupling-changes in receiver signal preferences that parallel temperature-induced changes in signal parameters-occurs among genetically coupled signallers and receivers. Whether eavesdroppers of communication signals exhibit temperature coupling is unknown. Here, we investigate if the parasitoid fly Ormia ochracea, an eavesdropper of cricket calling songs, exhibits song pulse rate preferences that are temperature coupled. We use a high-speed treadmill system to record walking phonotaxis at three ambient temperatures (21, 25, and 30°C) in response to songs that varied in pulse rates (20 to 90 pulses per second). Total walking distance, peak steering velocity, angular heading, and the phonotaxis performance index varied with song pulse rates and ambient temperature. The peak of phonotaxis performance index preference functions became broader and shifted to higher pulse rate values at higher temperatures. Temperature-related changes in cricket songs between 21 and 30°C did not drastically affect the ability of flies to recognize cricket calling songs. These results confirm that temperature coupling can occur in eavesdroppers that are not genetically coupled with signallers.
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Affiliation(s)
| | | | - Iya Abdulkarim
- Department of Biology, St Olaf College, Northfield, MN, USA
| | | | | | | | - Norman Lee
- Department of Biology, St Olaf College, Northfield, MN, USA
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2
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Trillo PA, Bernal XE, Hall RJ. Mixed-species assemblages and disease: the importance of differential vector and parasite attraction in transmission dynamics. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220109. [PMID: 37066659 PMCID: PMC10107280 DOI: 10.1098/rstb.2022.0109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 01/13/2023] [Indexed: 04/18/2023] Open
Abstract
Individuals from multiple species often aggregate at resources, group to facilitate defense and foraging, or are brought together by human activity. While it is well-documented that host-seeking disease vectors and parasites show biases in their responses to cues from different hosts, the influence of mixed-species assemblages on disease dynamics has received limited attention. Here, we synthesize relevant research in host-specific vector and parasite bias. To better understand how vector and parasite biases influence infection, we provide a conceptual framework describing cue-oriented vector and parasite host-seeking behaviour as a two-stage process that encompasses attraction of these enemies to the assemblage and their choice of hosts once at the assemblage. We illustrate this framework, developing a case study of mixed-species frog assemblages, where frog-biting midges transmit trypanosomes. Finally, we present a mathematical model that investigates how host species composition and asymmetries in vector attraction modulate transmission dynamics in mixed-species assemblages. We argue that differential attraction of vectors by hosts can have important consequences for disease transmission within mixed-species assemblages, with implications for wildlife conservation and zoonotic disease. This article is part of the theme issue 'Mixed-species groups and aggregations: shaping ecological and behavioural patterns and processes'.
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Affiliation(s)
- Paula A. Trillo
- Department of Biology, Gettysburg College, Gettysburg, PA 17325, USA
| | - Ximena E. Bernal
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA
- Smithsonian Tropical Research Institute, Apartado 0843-03092, Panama, República de Panama
| | - Richard J. Hall
- Odum School of Ecology, University of Georgia, Athens, GA 30602, USA
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
- Center for the Ecology of Infectious Diseases, University of Georgia, Athens, GA 30602, USA
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3
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White TE, Latty T, Umbers KDL. The exploitation of sexual signals by predators: a meta-analysis. Proc Biol Sci 2022; 289:20220444. [PMID: 35642366 PMCID: PMC9156902 DOI: 10.1098/rspb.2022.0444] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Sexual signals are often central to reproduction, and their expression is thought to strike a balance between advertising to mates and avoiding detection by predatory eavesdroppers. Tests of the predicted predation costs have produced mixed results, however. Here we synthesized 187 effects from 78 experimental studies in a meta-analytic test of two questions; namely, whether predators, parasites and parasitoids express preferences for the sexual signals of prey, and whether sexual signals increase realized predation risk in the wild. We found that predators and parasitoids express strong and consistent preferences for signals in forced-choice contexts. We found a similarly strong overall increase in predation on sexual signallers in the wild, though here it was modality specific. Olfactory and acoustic signals increased the incidence of eavesdropping relative to visual signals, which experienced no greater risk than controls on average. Variation in outcome measures was universally high, suggesting that contexts in which sexual signalling may incur no cost, or even reduce the incidence of predation, are common. Our results reveal unexpected complexity in a central viability cost to sexual signalling, while also speaking to applied problems in invasion biology and pest management where signal exploitation holds promise for bio-inspired solutions.
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Affiliation(s)
- Thomas E. White
- School of Life and Environmental Sciences, The University of Sydney, Sydney 2106, Australia
| | - Tanya Latty
- School of Life and Environmental Sciences, The University of Sydney, Sydney 2106, Australia
| | - Kate D. L. Umbers
- School of Science, Western Sydney University, Sydney, New South Wales 2751, Australia,Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales 2751, Australia
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4
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Rogers KJ, Beckers OM. Parasitism of
Neoconocephalus
katydids by the parasitoid fly,
Ormia lineifrons. Ethology 2021. [DOI: 10.1111/eth.13245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kyler J. Rogers
- Department of Biological Sciences Murray State University Murray Kentucky USA
| | - Oliver M. Beckers
- Department of Biological Sciences Murray State University Murray Kentucky USA
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5
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Mason AC. Cues for Directional Hearing in the Fly Ormia ochracea. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.679064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Insects are often small relative to the wavelengths of sounds they need to localize, which presents a fundamental biophysical problem. Understanding novel solutions to this limitation can provide insights for biomimetic technologies. Such an approach has been successful using the fly Ormia ochracea (Diptera: Tachinidae) as a model. O. ochracea is a parasitoid species whose larvae develop as internal parasites within crickets (Gryllidae). In nature, female flies find singing male crickets by phonotaxis, despite severe constraints on directional hearing due to their small size. A physical coupling between the two tympanal membranes allows the flies to obtain information about sound source direction with high accuracy because it generates interaural time-differences (ITD) and interaural level differences (ILD) in tympanal vibrations that are exaggerated relative to the small arrival-time difference at the two ears, that is the only cue available in the sound stimulus. In this study, I demonstrate that pure time-differences in the neural responses to sound stimuli are sufficient for auditory directionality in O. ochracea.
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6
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Dobbs OL, Talavera JB, Rossi SM, Menjivar S, Gray DA. Signaler-receiver-eavesdropper: Risks and rewards of variation in the dominant frequency of male cricket calls. Ecol Evol 2020; 10:12364-12371. [PMID: 33209294 PMCID: PMC7663976 DOI: 10.1002/ece3.6866] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 09/01/2020] [Accepted: 09/10/2020] [Indexed: 11/09/2022] Open
Abstract
Signals are important for communication and mating, and while they can benefit an individual, they can also be costly and dangerous. Male field crickets call in order to attract female crickets, but gravid females of a parasitoid fly species, Ormia ochracea, are also attracted to the call and use it to pinpoint male cricket hosts. Conspicuousness of the call can vary with frequency, amplitude, and temporal features. Previous work with this system has only considered temporal variation in cricket calls, both large scale, that is, amount of calling and at what time of evening, and small scale, that is, aspects of chirp rate, pulse rate, and numbers of pulses per chirp. Because auditory perception in both crickets and flies relies on the matching of the peak frequency of the call with the peripheral sensory system, peak frequency may be subject to selection both from female crickets and from female flies. Here, we used field playbacks of four different versions of the same male Gryllus lineaticeps calling song that only differed in peak frequency (3.3, 4.3, 5.3, and 6.3 kHz) to test the relative attractiveness of the calls to female crickets and female flies. Our results clearly show that lower frequency calls enhance male safety from fly parasitism, but that the enhanced safety would come at a cost of reduced attraction of female crickets as potential mates. The results imply that eavesdropper pressure can disrupt the matched coevolution of signalers and receivers such that the common concept of matched male-female signaler-receiver coevolution may actually be better described as male-female-predator signaler-receiver-eavesdropper coevolution.
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Affiliation(s)
- Olivia L. Dobbs
- Department of BiologyCalifornia State University NorthridgeNorthridgeCAUSA
| | | | - Sarina M. Rossi
- Department of BiologyCalifornia State University NorthridgeNorthridgeCAUSA
| | - Stephanie Menjivar
- Department of BiologyCalifornia State University NorthridgeNorthridgeCAUSA
| | - David A. Gray
- Department of BiologyCalifornia State University NorthridgeNorthridgeCAUSA
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7
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Baker E, Chesmore D. Standardisation of bioacoustic terminology for insects. Biodivers Data J 2020; 8:e54222. [PMID: 32848502 PMCID: PMC7419339 DOI: 10.3897/bdj.8.e54222] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 07/22/2020] [Indexed: 11/26/2022] Open
Abstract
After reviewing the published literature on sound production in insects, a standardised terminology and controlled vocabularies have been created. This combined terminology has potential for use in automated identification systems, evolutionary studies, and other use cases where the synthesis of bioacoustic traits from the literature is required. An example implementation has been developed for the BioAcoustica platform. It is hoped that future development of controlled vocabularies will become a community effort.
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Affiliation(s)
- Edward Baker
- University of York, York, United Kingdom University of York York United Kingdom
| | - David Chesmore
- University of York, York, United Kingdom University of York York United Kingdom
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8
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Gray DA, Kunerth HD, Zuk M, Cade WH, Balenger SL. Molecular biogeography and host relations of a parasitoid fly. Ecol Evol 2019; 9:11476-11493. [PMID: 31641487 PMCID: PMC6802024 DOI: 10.1002/ece3.5649] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 08/05/2019] [Accepted: 08/15/2019] [Indexed: 12/14/2022] Open
Abstract
Successful geographic range expansion by parasites and parasitoids may also require host range expansion. Thus, the evolutionary advantages of host specialization may trade off against the ability to exploit new host species encountered in new geographic regions. Here, we use molecular techniques and confirmed host records to examine biogeography, population divergence, and host flexibility of the parasitoid fly, Ormia ochracea (Bigot). Gravid females of this fly find their cricket hosts acoustically by eavesdropping on male cricket calling songs; these songs vary greatly among the known host species of crickets. Using both nuclear and mitochondrial genetic markers, we (a) describe the geographical distribution and subdivision of genetic variation in O. ochracea from across the continental United States, the Mexican states of Sonora and Oaxaca, and populations introduced to Hawaii; (b) demonstrate that the distribution of genetic variation among fly populations is consistent with a single widespread species with regional host specialization, rather than locally differentiated cryptic species; (c) identify the more-probable source populations for the flies introduced to the Hawaiian islands; (d) examine genetic variation and substructure within Hawaii; (e) show that among-population geographic, genetic, and host song distances are all correlated; and (f) discuss specialization and lability in host-finding behavior in light of the diversity of cricket songs serving as host cues in different geographically separate populations.
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Affiliation(s)
- David A. Gray
- Department of BiologyCalifornia State University NorthridgeNorthridgeCAUSA
| | - Henry D. Kunerth
- Department of Ecology and Evolutionary BiologyCornell UniversityIthacaNYUSA
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
| | - Marlene Zuk
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
| | - William H. Cade
- Department of Biological SciencesUniversity of LethbridgeLethbridgeABCanada
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9
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10
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Gray DA, Hormozi S, Libby FR, Cohen RW. Induced expression of a vestigial sexual signal. Biol Lett 2018; 14:20180095. [PMID: 29769298 PMCID: PMC6012708 DOI: 10.1098/rsbl.2018.0095] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 04/23/2018] [Indexed: 11/12/2022] Open
Abstract
Vestigial morphological traits are common and well known in a variety of taxa. Identification of vestigial genes has illustrated the potential for evolutionary reversals and the re-expression of atavistic traits. Here we induce expression of a behavioural sexual signal, male calling song, in a cricket species, Gryllus ovisopis, which lacks a functional calling song. We successfully used acetylcholine injections in the frontal space of the head of male crickets to activate cerebral command neurons for cricket calling, and we recorded calling songs with a temporal chirp pattern similar to that of G. ovisopis' close evolutionary relatives, G. firmus and G. pennsylvanicus, implying that the neural pattern generators that underlie cricket calling behaviour persist in a vestigial state in G. ovisopis To our knowledge, this is the first demonstration of the induced expression of a vestigial behaviour in any organism. The retention of latent neural capacity to express sexual behaviours could have important implications for rapid evolution, trait re-emergence and reproductive isolation.
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Affiliation(s)
- David A Gray
- Department of Biology, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA
| | - Scherezade Hormozi
- Department of Biology, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA
| | - Fritz R Libby
- Department of Biology, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA
| | - Randy W Cohen
- Department of Biology, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA
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11
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Gray DA, Gabel E, Blankers T, Hennig RM. Multivariate female preference tests reveal latent perceptual biases. Proc Biol Sci 2017; 283:rspb.2016.1972. [PMID: 27807265 DOI: 10.1098/rspb.2016.1972] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 10/10/2016] [Indexed: 11/12/2022] Open
Abstract
The question of why males of many species produce elaborate mating displays has now been largely resolved: females prefer to mate with males that produce such displays. However, the question of why females prefer such displays has been controversial, with an emerging consensus that such displays often provide information to females about the direct fitness benefits that males provide to females and/or the indirect fitness benefits provided to offspring. Alternative explanations, such as production of arbitrarily attractive sons or innate pre-existing female sensory or perceptual bias, have also received support in certain taxa. Here, we describe multivariate female preference functions for male acoustic traits in two chirping species of field crickets with slow pulse rates; our data reveal cryptic female preferences for long trills that have not previously been observed in other chirping species. The trill preferences are evolutionarily pre-existing in the sense that males have not (yet?) exploited them, and they coexist with chirp preferences as alternative stable states within female song preference space. We discuss escape from neuronal adaptation as a possible mechanism underlying such latent preferences.
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Affiliation(s)
- D A Gray
- Department of Biology, California State University Northridge, Northridge, CA, USA
| | - E Gabel
- Behavioural Physiology, Department of Biology, Humboldt-Universität zu Berlin, Berlin, Germany
| | - T Blankers
- Behavioural Physiology, Department of Biology, Humboldt-Universität zu Berlin, Berlin, Germany.,Museum für Naturkunde Berlin, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
| | - R M Hennig
- Behavioural Physiology, Department of Biology, Humboldt-Universität zu Berlin, Berlin, Germany
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12
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Blankers T, Block R, Hennig RM. Codivergence but Limited Covariance of Wing Shape and Calling Song Structure in Field Crickets (Gryllus). Evol Biol 2017. [DOI: 10.1007/s11692-017-9439-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Multivariate Phenotypic Evolution: Divergent Acoustic Signals and Sexual Selection in Gryllus Field Crickets. Evol Biol 2016. [DOI: 10.1007/s11692-016-9388-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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14
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Divergence in male cricket song and female preference functions in three allopatric sister species. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2016; 202:347-60. [PMID: 27026021 DOI: 10.1007/s00359-016-1083-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 03/08/2016] [Accepted: 03/11/2016] [Indexed: 10/22/2022]
Abstract
Multivariate female preference functions for male sexual signals have rarely been investigated, especially in a comparative context among sister species. Here we examined male signal and female preference co-variation in three closely related, but allopatric species of Gryllus crickets and quantified male song traits as well as female preferences. We show that males differ conspicuously in either one of two relatively static song traits, carrier frequency or pulse rate; female preference functions for these traits also differed, and would in combination enhance species discrimination. In contrast, the relatively dynamic song traits, chirp rate and chirp duty cycle, show minimal divergence among species and relatively greater conservation of female preference functions. Notably, among species we demonstrate similar mechanistic rules for the integration of pulse and chirp time scales, despite divergence in pulse rate preferences. As these are allopatric taxa, selection for species recognition per se is unlikely. More likely sexual selection combined with conserved properties of preference filters enabled divergent coevolution of male song and female preferences.
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15
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Meuche I, Keller A, Ahmad Sah HH, Ahmad N, Grafe TU. Silent listeners: can preferences of eavesdropping midges predict their hosts’ parasitism risk? Behav Ecol 2016. [DOI: 10.1093/beheco/arw002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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16
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Gray DA, Gutierrez NJ, Chen TL, Gonzalez C, Weissman DB, Cole JA. Species divergence in field crickets: genetics, song, ecomorphology, and pre- and postzygotic isolation. Biol J Linn Soc Lond 2015. [DOI: 10.1111/bij.12668] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- David A. Gray
- Department of Biology; California State University Northridge; Northridge CA 91330-8303 USA
| | - Nicholas J. Gutierrez
- Department of Biology; California State University Northridge; Northridge CA 91330-8303 USA
| | - Tom L. Chen
- Department of Biology; California State University Northridge; Northridge CA 91330-8303 USA
| | - Christopher Gonzalez
- Department of Biology; California State University Northridge; Northridge CA 91330-8303 USA
| | - David B. Weissman
- Department of Entomology; California Academy of Sciences; San Francisco CA 94118 USA
| | - Jeffrey A. Cole
- Department of Biology; California State University Northridge; Northridge CA 91330-8303 USA
- Department of Biology; Pasadena City College; Pasadena CA 91106 USA
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17
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18
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Do frog-eating bats perceptually bind the complex components of frog calls? J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2013; 199:279-83. [DOI: 10.1007/s00359-012-0791-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 12/03/2012] [Accepted: 12/30/2012] [Indexed: 11/27/2022]
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19
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Eavesdropping parasitoids do not cause the evolution of less conspicuous signalling behaviour in a field cricket. Anim Behav 2012; 84:1457-1462. [PMID: 23888083 DOI: 10.1016/j.anbehav.2012.09.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Males of many species produce conspicuous mating signals to attract females, but these signals can also attract eavesdropping predators and parasites. Males are thus expected to evolve signalling behaviours that balance the sexual selection benefits and the natural selection costs. In the variable field cricket, Gryllus lineaticeps, males sing to attract females, but these songs also attract the lethal parasitoid fly Ormia ochracea. The flies use male crickets as hosts for their larvae, primarily search for hosts during a 2 h period following sunset and prefer the same song types as female crickets. We tested whether males from high-risk populations reduce the risk of parasitism by singing less frequently or by shifting their singing activity to a time of the night when the risk of parasitism is low. We compared male singing activity and its temporal pattern between six high-risk and six low-risk populations that were reared in a common environment. There was no effect of parasitism risk on either total male singing activity or the temporal pattern of male singing activity. Males from high-risk populations thus sang as frequently as males from low-risk populations. These results suggest that sexual selection on male singing behaviour may be substantially stronger in high-risk populations than in low-risk populations. It is possible that other traits may have evolved to reduce parasitism risk without compromising mate attraction.
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20
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Paur J, Gray DA. Individual consistency, learning and memory in a parasitoid fly, Ormia ochracea. Anim Behav 2011. [DOI: 10.1016/j.anbehav.2011.07.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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21
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Gray DA. Speciation, Divergence, and the Origin of Gryllus rubens: Behavior, Morphology, and Molecules. INSECTS 2011; 2:195-209. [PMID: 26467622 PMCID: PMC4553458 DOI: 10.3390/insects2020195] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 04/22/2011] [Accepted: 04/26/2011] [Indexed: 11/16/2022]
Abstract
The last 25 years or so has seen a huge resurgence of interest in speciation research. This has coincided with the development and widespread use of new tools in molecular genetics, especially DNA sequencing, to inform ecological and evolutionary questions. Here I review about a decade of work on the sister species of field crickets Gryllus texensis and G. rubens. This work has included analysis of morphology, behavior, and the mitochondrial DNA molecule. The molecular work in particular has dramatically re-shaped my interpretation of the speciational history of these taxa, suggesting that rather than ‘sister’ species we should consider these taxa as ‘mother-daughter’ species with G. rubens derived from within a subset of ancestral G. texensis.
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Affiliation(s)
- David A Gray
- Department of Biology, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA.
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