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Luecke D, Luo Y, Krzystek H, Jones C, Kopp A. Highly Contiguous Genome Assembly of Drosophila prolongata - a Model for Evolution of Sexual Dimorphism and Male-specific Innovations. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.29.577853. [PMID: 38352395 PMCID: PMC10862779 DOI: 10.1101/2024.01.29.577853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Drosophila prolongata is a member of the melanogaster species group and rhopaloa subgroup native to the subtropical highlands of southeast Asia. This species exhibits an array of recently evolved male-specific morphological, physiological, and behavioral traits that distinguish it from its closest relatives, making it an attractive model for studying the evolution of sexual dimorphism and testing theories of sexual selection. The lack of genomic resources has impeded the dissection of the molecular basis of sex-specific development and behavior in this species. To address this, we assembled the genome of D. prolongata using long-read sequencing and Hi-C scaffolding, resulting in a highly complete and contiguous (scaffold N50 2.2Mb) genome assembly of 220Mb. The repetitive content of the genome is 24.6%, the plurality of which are LTR retrotransposons (33.2%). Annotations based on RNA-seq data and homology to related species revealed a total of 19,330 genes, of which 16,170 are protein-coding. The assembly includes 98.5% of Diptera BUSCO genes, including 93.8% present as a single copy. Despite some likely regional duplications, the completeness of this genome suggests that it can be readily used for gene expression, GWAS, and other genomic analyses.
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Affiliation(s)
- David Luecke
- Department of Evolution and Ecology, University of California Davis, One Shields Ave Davis CA 95616
| | - Yige Luo
- Department of Evolution and Ecology, University of California Davis, One Shields Ave Davis CA 95616
| | - Halina Krzystek
- Biology Department of the University of North Carolina (UNC), 3159 Genome Sciences Building. 250 Bell Tower Drive. Chapel Hill, NC 27599
| | - Corbin Jones
- Biology Department of the University of North Carolina (UNC), 3159 Genome Sciences Building. 250 Bell Tower Drive. Chapel Hill, NC 27599
| | - Artyom Kopp
- Department of Evolution and Ecology, University of California Davis, One Shields Ave Davis CA 95616
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Kopp A, Barmina O. Interspecific variation in sex-specific gustatory organs in Drosophila. J Comp Neurol 2022; 530:2439-2450. [PMID: 35603778 PMCID: PMC9339527 DOI: 10.1002/cne.25340] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/26/2022] [Accepted: 04/28/2022] [Indexed: 11/08/2022]
Abstract
Drosophila males use leg gustatory bristles to discriminate between male and female cuticular pheromones as an important part of courtship behavior. In Drosophila melanogaster, several male-specific gustatory bristles are present on the anterior surface of the first tarsal segment of the prothoracic leg, in addition to a larger set of gustatory bristles found in both sexes. These bristles are thought to be specialized for pheromone detection. Here, we report the number and location of sex-specific gustatory bristles in 27 other Drosophila species. Although some species have a pattern similar to D. melanogaster, others lack anterior male-specific bristles but have many dorsal male-specific gustatory bristles instead. Some species have both anterior and dorsal male-specific bristles, while others lack sexual dimorphism entirely. In several distantly related species, the number of gustatory bristles is much greater in males than in females due to a male-specific transformation of ancestrally mechanosensory bristles to a chemosensory identity. This variation in the extent and pattern of sexual dimorphism may affect the formation and function of neuronal circuits that control Drosophila courtship and contribute to the evolution of mating behavior.
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Affiliation(s)
- Artyom Kopp
- Department of Evolution and Ecology, University of California Davis
| | - Olga Barmina
- Department of Evolution and Ecology, University of California Davis
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Pavković-Lučić S, Trajković J, Miličić D, Anđelković B, Lučić L, Savić T, Vujisić L. "Scent of a fruit fly": Cuticular chemoprofiles after mating in differently fed Drosophila melanogaster (Diptera: Drosophilidae) strains. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2022; 109:e21866. [PMID: 35020218 DOI: 10.1002/arch.21866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 12/07/2021] [Accepted: 12/25/2021] [Indexed: 06/14/2023]
Abstract
In the world of complex smells in natural environment, feeding and mating represent two important olfactory-guided behaviors in Drosophila melanogaster (Diptera: Drosophilidae). Diet affects the chemoprofile composition of the individuals, which, indirectly, may significantly affect their mating success. In this study, chemoprofiles of recently mated flies belonging to four D. melanogaster strains, which were fed for many generations on different substrates (standard cornmeal-S strain; banana-B strain; carrot-C strain; tomato-T strain) were identified and quantified. In total, 67 chemical compounds were identified: 48 compounds were extracted from males maintained on banana and carrot, and 47 compounds from males maintained on cornmeal and tomato substrates, while total of 60 compounds were identified in females from all strains. The strains and the sexes significantly differed in qualitative nature of their chemoprofiles after mating. Significant differences in the relative amount of three major male pheromones (cis-vaccenyl acetate-cVA, (Z)-7-pentacosene, and (Z)-7-tricosene) and in female pheromone (Z,Z)-7,11-nonacosadiene among strains were also recorded. Furthermore, multivariate analysis of variance (MANOVA) pointed to significant differences between virgin and mated individuals of all strains and within both sexes. Differences in some of the well known sex pheromones were also identified when comparing their relative amount before and after mating. The presence of typical male pheromones in females, and vice versa may indicate their bidirectional transfer during copulation. Our results confirm significant effect of mating status on cuticular hydrocarbon (CHC) phenotypes in differently fed D. melanogaster flies.
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Affiliation(s)
| | | | - Dragana Miličić
- Faculty of Biology, University of Belgrade, Belgrade, Serbia
| | | | - Luka Lučić
- Faculty of Biology, University of Belgrade, Belgrade, Serbia
| | - Tatjana Savić
- Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
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Golian M, Bien T, Schmelzle S, Esparza-Mora MA, McMahon DP, Dreisewerd K, Buellesbach J. Neglected Very Long-Chain Hydrocarbons and the Incorporation of Body Surface Area Metrics Reveal Novel Perspectives for Cuticular Profile Analysis in Insects. INSECTS 2022; 13:insects13010083. [PMID: 35055926 PMCID: PMC8778109 DOI: 10.3390/insects13010083] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/02/2022] [Accepted: 01/03/2022] [Indexed: 12/10/2022]
Abstract
Simple Summary The waxy layer covering the surface of most terrestrial insects is mainly composed of non-polar lipids termed cuticular hydrocarbons (CHCs). These have a long research history as important dual traits for both desiccation prevention and chemical communication. We analyzed CHC profiles of seven species of the insect order Blattodea (termites and cockroaches) with the most commonly applied chromatographic method, gas-chromatography coupled with mass spectrometry (GC-MS), and the more novel approach of silver-assisted laser desorption/ionization mass spectrometry (Ag-LDI-MS). Comparing these two analytical methods, we demonstrated that the conventional GC-MS approach does not provide enough information on the entire CHC profile range in the tested species. Ag-LDI-MS was able to detect very long-chain CHCs ranging up to C58, which remained undetected when solely relying on standard GC-MS analysis. Additionally, we measured the body surface areas of each tested species applying 3D scanning technology to assess their respective CHC amounts per mm2. When adjusting for body surface areas, proportional CHC quantity distributions shifted considerably between our studied species, suggesting the importance of including this factor when conducting quantitative CHC comparisons, particularly in insects that vary substantially in body size. Abstract Most of our knowledge on insect cuticular hydrocarbons (CHCs) stems from analytical techniques based on gas-chromatography coupled with mass spectrometry (GC-MS). However, this method has its limits under standard conditions, particularly in detecting compounds beyond a chain length of around C40. Here, we compare the CHC chain length range detectable by GC-MS with the range assessed by silver-assisted laser desorption/ionization mass spectrometry (Ag-LDI-MS), a novel and rarely applied technique on insect CHCs, in seven species of the order Blattodea. For all tested species, we unveiled a considerable range of very long-chain CHCs up to C58, which are not detectable by standard GC-MS technology. This indicates that general studies on insect CHCs may frequently miss compounds in this range, and we encourage future studies to implement analytical techniques extending the conventionally accessed chain length range. Furthermore, we incorporate 3D scanned insect body surface areas as an additional factor for the comparative quantification of extracted CHC amounts between our study species. CHC quantity distributions differed considerably when adjusted for body surface areas as opposed to directly assessing extracted CHC amounts, suggesting that a more accurate evaluation of relative CHC quantities can be achieved by taking body surface areas into account.
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Affiliation(s)
- Marek Golian
- Institute for Evolution & Biodiversity, University of Münster, Hüfferstr. 1, D-48149 Münster, Germany;
| | - Tanja Bien
- Institute of Hygiene, University of Münster, Robert-Koch-Str. 41, D-48149 Münster, Germany; (T.B.); (K.D.)
| | - Sebastian Schmelzle
- Ecological Networks, Technical University of Darmstadt, Schnittspahnstr. 2, D-64287 Darmstadt, Germany;
| | - Margy Alejandra Esparza-Mora
- Institute of Biology—Zoology, Free University of Berlin, Unter den Eichen 87, D-12205 Berlin, Germany; (M.A.E.-M.); (D.P.M.)
- Department for Materials and Environment, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany
| | - Dino Peter McMahon
- Institute of Biology—Zoology, Free University of Berlin, Unter den Eichen 87, D-12205 Berlin, Germany; (M.A.E.-M.); (D.P.M.)
- Department for Materials and Environment, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany
| | - Klaus Dreisewerd
- Institute of Hygiene, University of Münster, Robert-Koch-Str. 41, D-48149 Münster, Germany; (T.B.); (K.D.)
| | - Jan Buellesbach
- Institute for Evolution & Biodiversity, University of Münster, Hüfferstr. 1, D-48149 Münster, Germany;
- Correspondence: ; Tel.: +49-(0)-251-83-21637
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Harrison BR, Hoffman JM, Samuelson A, Raftery D, Promislow DEL. Modular Evolution of the Drosophila Metabolome. Mol Biol Evol 2022; 39:msab307. [PMID: 34662414 PMCID: PMC8760934 DOI: 10.1093/molbev/msab307] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Comparative phylogenetic studies offer a powerful approach to study the evolution of complex traits. Although much effort has been devoted to the evolution of the genome and to organismal phenotypes, until now relatively little work has been done on the evolution of the metabolome, despite the fact that it is composed of the basic structural and functional building blocks of all organisms. Here we explore variation in metabolite levels across 50 My of evolution in the genus Drosophila, employing a common garden design to measure the metabolome within and among 11 species of Drosophila. We find that both sex and age have dramatic and evolutionarily conserved effects on the metabolome. We also find substantial evidence that many metabolite pairs covary after phylogenetic correction, and that such metabolome coevolution is modular. Some of these modules are enriched for specific biochemical pathways and show different evolutionary trajectories, with some showing signs of stabilizing selection. Both observations suggest that functional relationships may ultimately cause such modularity. These coevolutionary patterns also differ between sexes and are affected by age. We explore the relevance of modular evolution to fitness by associating modules with lifespan variation measured in the same common garden. We find several modules associated with lifespan, particularly in the metabolome of older flies. Oxaloacetate levels in older females appear to coevolve with lifespan, and a lifespan-associated module in older females suggests that metabolic associations could underlie 50 My of lifespan evolution.
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Affiliation(s)
- Benjamin R Harrison
- Department of Lab Medicine & Pathology, University of Washington School of Medicine, Seattle, WA, USA
| | - Jessica M Hoffman
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Ariana Samuelson
- Department of Biology, University of Washington, Seattle, WA, USA
| | - Daniel Raftery
- Department of Anesthesiology & Pain Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - Daniel E L Promislow
- Department of Lab Medicine & Pathology, University of Washington School of Medicine, Seattle, WA, USA
- Department of Biology, University of Washington, Seattle, WA, USA
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Saleh NW, Hodgson K, Pokorny T, Mullins A, Chouvenc T, Eltz T, Ramírez SR. Social Behavior, Ovary Size, and Population of Origin Influence Cuticular Hydrocarbons in the Orchid Bee Euglossa dilemma. Am Nat 2021; 198:E136-E151. [PMID: 34648396 DOI: 10.1086/716511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractCuticular hydrocarbons (CHCs) are waxy compounds on the surface of insects that prevent desiccation and frequently serve as chemical signals mediating social and mating behaviors. Although their function in eusocial species has been heavily investigated, little is known about the evolution of CHC-based communication in species with simpler forms of social organization lacking specialized castes. Here we investigate factors shaping CHC variation in the orchid bee Euglossa dilemma, which forms casteless social groups of two to three individuals. We first assess geographic variation, examining CHC profiles of males and females from three populations. We also consider CHC variation in the sister species, Euglossa viridissima, which occurs sympatrically with one population of E. dilemma. Next, we consider variation associated with female behavioral phases, to test the hypothesis that CHCs reflect ovary size and social dominance. We uncover a striking CHC polymorphism in E. dilemma spanning populations. In addition, we identify a separate set of CHCs that correlate with ovary size, social dominance, and expression of genes associated with social behavior, suggesting that CHCs convey reproductive and social information in E. dilemma. Together, our results reveal complex patterns of variation in which a subset of CHCs reflect the social and reproductive status of nestmates.
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Holze H, Schrader L, Buellesbach J. Advances in deciphering the genetic basis of insect cuticular hydrocarbon biosynthesis and variation. Heredity (Edinb) 2021; 126:219-234. [PMID: 33139902 PMCID: PMC8027674 DOI: 10.1038/s41437-020-00380-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 02/01/2023] Open
Abstract
Cuticular hydrocarbons (CHCs) have two fundamental functions in insects. They protect terrestrial insects against desiccation and serve as signaling molecules in a wide variety of chemical communication systems. It has been hypothesized that these pivotal dual traits for adaptation to both desiccation and signaling have contributed to the considerable evolutionary success of insects. CHCs have been extensively studied concerning their variation, behavioral impact, physiological properties, and chemical compositions. However, our understanding of the genetic underpinnings of CHC biosynthesis has remained limited and mostly biased towards one particular model organism (Drosophila). This rather narrow focus has hampered the establishment of a comprehensive view of CHC genetics across wider phylogenetic boundaries. This review attempts to integrate new insights and recent knowledge gained in the genetics of CHC biosynthesis, which is just beginning to incorporate work on more insect taxa beyond Drosophila. It is intended to provide a stepping stone towards a wider and more general understanding of the genetic mechanisms that gave rise to the astonishing diversity of CHC compounds across different insect taxa. Further research in this field is encouraged to aim at better discriminating conserved versus taxon-specific genetic elements underlying CHC variation. This will be instrumental in greatly expanding our knowledge of the origins and variation of genes governing the biosynthesis of these crucial phenotypic traits that have greatly impacted insect behavior, physiology, and evolution.
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Affiliation(s)
- Henrietta Holze
- Molecular Evolution and Sociobiology Group, Institute for Evolution and Biodiversity, University of Münster, Hüfferstr. 1, DE-48149, Münster, Germany
| | - Lukas Schrader
- Molecular Evolution and Sociobiology Group, Institute for Evolution and Biodiversity, University of Münster, Hüfferstr. 1, DE-48149, Münster, Germany
| | - Jan Buellesbach
- Molecular Evolution and Sociobiology Group, Institute for Evolution and Biodiversity, University of Münster, Hüfferstr. 1, DE-48149, Münster, Germany.
- Department of Environmental Science, Policy, and Management, University of California-Berkeley, 130 Mulford Hall #3114, Berkeley, CA, 94720-3114, USA.
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Park SJ, Pandey G, Castro-Vargas C, Oakeshott JG, Taylor PW, Mendez V. Cuticular Chemistry of the Queensland Fruit Fly Bactrocera tryoni (Froggatt). Molecules 2020; 25:E4185. [PMID: 32932681 PMCID: PMC7571174 DOI: 10.3390/molecules25184185] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 08/26/2020] [Accepted: 09/10/2020] [Indexed: 01/01/2023] Open
Abstract
The cuticular layer of the insect exoskeleton contains diverse compounds that serve important biological functions, including the maintenance of homeostasis by protecting against water loss, protection from injury, pathogens and insecticides, and communication. Bactrocera tryoni (Froggatt) is the most destructive pest of fruit production in Australia, yet there are no published accounts of this species' cuticular chemistry. We here provide a comprehensive description of B. tryoni cuticular chemistry. We used gas chromatography-mass spectrometry to identify and characterize compounds in hexane extracts of B. tryoni adults reared from larvae in naturally infested fruits. The compounds found included spiroacetals, aliphatic amides, saturated/unsaturated and methyl branched C12 to C20 chain esters and C29 to C33 normal and methyl-branched alkanes. The spiroacetals and esters were found to be specific to mature females, while the amides were found in both sexes. Normal and methyl-branched alkanes were qualitatively the same in all age and sex groups but some of the alkanes differed in amounts (as estimated from internal standard-normalized peak areas) between mature males and females, as well as between mature and immature flies. This study provides essential foundations for studies investigating the functions of cuticular chemistry in this economically important species.
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Affiliation(s)
- Soo J. Park
- Applied BioSciences, Macquarie University, North Ryde, NSW 2109, Australia; (G.P.); (C.C.-V.); (J.G.O.); (P.W.T.); (V.M.)
- Australian Research Council Centre for Fruit Fly Biosecurity Innovation, Macquarie University, North Ryde, NSW 2109, Australia
| | - Gunjan Pandey
- Applied BioSciences, Macquarie University, North Ryde, NSW 2109, Australia; (G.P.); (C.C.-V.); (J.G.O.); (P.W.T.); (V.M.)
- Commonwealth Scientific and Industrial Research Organisation Land and Water, Black Mountain, Acton, ACT 2601, Australia
| | - Cynthia Castro-Vargas
- Applied BioSciences, Macquarie University, North Ryde, NSW 2109, Australia; (G.P.); (C.C.-V.); (J.G.O.); (P.W.T.); (V.M.)
- Commonwealth Scientific and Industrial Research Organisation Land and Water, Black Mountain, Acton, ACT 2601, Australia
| | - John G. Oakeshott
- Applied BioSciences, Macquarie University, North Ryde, NSW 2109, Australia; (G.P.); (C.C.-V.); (J.G.O.); (P.W.T.); (V.M.)
- Commonwealth Scientific and Industrial Research Organisation Land and Water, Black Mountain, Acton, ACT 2601, Australia
| | - Phillip W. Taylor
- Applied BioSciences, Macquarie University, North Ryde, NSW 2109, Australia; (G.P.); (C.C.-V.); (J.G.O.); (P.W.T.); (V.M.)
- Australian Research Council Centre for Fruit Fly Biosecurity Innovation, Macquarie University, North Ryde, NSW 2109, Australia
| | - Vivian Mendez
- Applied BioSciences, Macquarie University, North Ryde, NSW 2109, Australia; (G.P.); (C.C.-V.); (J.G.O.); (P.W.T.); (V.M.)
- Australian Research Council Centre for Fruit Fly Biosecurity Innovation, Macquarie University, North Ryde, NSW 2109, Australia
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9
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Butterworth NJ, Wallman JF, Drijfhout FP, Johnston NP, Keller PA, Byrne PG. The evolution of sexually dimorphic cuticular hydrocarbons in blowflies (Diptera: Calliphoridae). J Evol Biol 2020; 33:1468-1486. [PMID: 32722879 DOI: 10.1111/jeb.13685] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 07/13/2020] [Accepted: 07/20/2020] [Indexed: 12/01/2022]
Abstract
Cuticular hydrocarbons (CHCs) are organic compounds found on the cuticles of all insects which can act as close-contact pheromones, while also providing a hydrophobic barrier to water loss. Given their widespread importance in sexual behaviour and survival, CHCs have likely contributed heavily to the adaptation and speciation of insects. Despite this, the patterns and mechanisms of their diversification have been studied in very few taxa. Here, we perform the first study of CHC diversification in blowflies, focussing on wild populations of the ecologically diverse genus Chrysomya. We convert CHC profiles into qualitative and quantitative traits and assess their inter- and intra-specific variation across 10 species. We also construct a global phylogeny of Chrysomya, onto which CHCs were mapped to explore the patterns of their diversification. For the first time, we demonstrate that blowflies express an exceptional diversity of CHCs, which have diversified in a nonphylogenetic and punctuated manner, are species-specific and sexually dimorphic. It is likely that both ecological and sexual selection have shaped these patterns of CHC diversification, and our study now provides a comprehensive framework for testing such hypotheses.
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Affiliation(s)
- Nathan J Butterworth
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, Australia
| | - James F Wallman
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, Australia.,School of Life Sciences, University of Technology Sydney, Ultimo, NSW, Australia
| | - Falko P Drijfhout
- School of Chemical and Physical Sciences, Keele University, Keele, UK
| | - Nikolas P Johnston
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, Australia
| | - Paul A Keller
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia
| | - Phillip G Byrne
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, Australia
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10
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Food availability reverses the effect of hunger state on copulation rate in Drosophila prolongata females. Anim Behav 2020. [DOI: 10.1016/j.anbehav.2020.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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