1
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Amino K, Matsuo T. Reproductive advantage of the winners of male-male competition in Drosophila prolongata. Behav Processes 2023; 206:104831. [PMID: 36693576 DOI: 10.1016/j.beproc.2023.104831] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/16/2022] [Accepted: 01/20/2023] [Indexed: 01/22/2023]
Abstract
In the resource-defence mating system, where males compete for limited resources to acquire females, male traits associated with fighting ability are selected, leading to the evolution of sexual dimorphism. However, the evolution of sexual dimorphism is also driven by other mechanisms, such as female selection. Therefore, to elucidate the evolutionary mechanisms of male traits, it is necessary to clarify their contribution to fitness through male-male competition. In this regard, it is surprising that numerous studies on sexually dimorphic species have assumed the resource-defence mating system without directly examining the relationship between resource-defending behaviour and mating success. In a sexually dimorphic fruit fly, Drosophila prolongata, the presence of the resource-defence mating system has been suggested, but technical difficulties had prevented spatial quantification of the resource-defending behaviour. In this study, by using an automated behaviour analysis tool previously developed, we located the occurrence of male-male competition and courtship to investigate their relationship in D. prolongata, considering the position of food resources. We found that the male-male competition led to the exclusive occupation of resources, increasing the courtship opportunities of the resource holders. These results illustrate the importance of resource-defending for reproductive success in D. prolongata.
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Affiliation(s)
- Kai Amino
- Laboratory of Applied Entomology, Department of Agricultural and Environmental Biology, The University of Tokyo, Japan.
| | - Takashi Matsuo
- Laboratory of Applied Entomology, Department of Agricultural and Environmental Biology, The University of Tokyo, Japan
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2
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De Castro BD, Lanés LEK, Godoy RS, Maltchik L, Oliveira GT. Development stage-dependent oxidative stress responses to the exposure to roundup original© in a neotropical annual killifish. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2022; 95:103976. [PMID: 36100139 DOI: 10.1016/j.etap.2022.103976] [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: 06/02/2022] [Revised: 08/13/2022] [Accepted: 09/08/2022] [Indexed: 06/15/2023]
Abstract
Herbicides are the most commonly applied pesticides in Brazil, specifically those based on glyphosate, and are used for different crops, near the habitats of annual killifish. Annual killifish presents a short life cycle with generally restricted geographic distribution. In this context, we evaluated the effect of the Roundup Original© (65, 130 and 260 µg. L-1 of glyphosate) herbicide on different development stages (adult-young and senile) of the annual killifish (Cynopoecilus sp.). We quantified the oxidative balance markers (superoxide dismutase, catalase, glutathione S-transferase, lipid peroxidation levels, and total proteins). We observed that the senile individuals presented 2-fold higher lipid peroxidation levels associated with the maintenance of superoxide dismutase and catalase activity levels even after exposure to the herbicide. However, senile subjects were negatively impacted by the exposure to formulations containing glyphosate, and this was related to a loss of glutathione S-transferase activity. Our research demonstrated that the established physiological markers and this species look promising for toxicology studies.
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Affiliation(s)
- Bruna Dutra De Castro
- PUCRS, Pontifical Catholic University of Rio Grande do Sul, School of Health and Life Sciences, Conservation Physiology Laboratory, Conservation Physiology Laboratory, Porto Alegre, RS, Brazil
| | | | - Robson Souza Godoy
- UNISINOS, Universidade do Vale do Rio dos Sinos, Centro de Ciências, Programa de Pós-Graduação de Biologia, Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos, São Leopoldo, RS, Brazil
| | - Leonardo Maltchik
- FURG, Federal University of Rio Grande, Rectory, Pro-Rectory of Research and Graduate Studies, University of Rio Grande Foundation, Rio Grande, RS, Brazil
| | - Guendalina Turcato Oliveira
- PUCRS, Pontifical Catholic University of Rio Grande do Sul, School of Health and Life Sciences, Conservation Physiology Laboratory, Conservation Physiology Laboratory, Porto Alegre, RS, Brazil.
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3
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García G, Gutiérrez V, Ríos N. Living in Temporary Ponds Loading Giant Genomes: The Neotropical Annual Killifish Genus Austrolebias as New Outstanding Evolutionary Model. Front Genet 2022; 13:903683. [PMID: 35795213 PMCID: PMC9251178 DOI: 10.3389/fgene.2022.903683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 05/05/2022] [Indexed: 12/02/2022] Open
Abstract
The term Annual killifish describes a short-lived and amazing group of vertebrates inhabiting temporary ponds exposed to an extremely variable environment during its short lifespan in South America and Africa, leading to the death of the entire adult population during the dry season. Austrolebias is a specious genus of the family Rivulidae, with ∼58 currently recognized species, extensively distributed in the temperate Neotropical region. Herein, we reviewed different aspects of the evolutionary biology with emphasis on the genome dynamic linked to the burst speciation process in this genus. Austrolebias constitutes an excellent model to study the genomic evolutionary processes underlying speciation events, since all the species of this genus analyzed so far share an unusually large genome size, with an average DNA content of 5.95 ± 0.45 picograms per diploid cell (mean C-value of about 2.98 pg). The drastic nuclear DNA–increasing would be associated with a considerable proportion of transposable elements (TEs) found in the Austrolebias genomes. The genomic proportion of the moderately repetitive DNA in the A. charrua genome represents approximately twice (45%) the amount of the repetitive components of the highly related sympatric and syntopic rivulinae taxon Cynopoecilus melanotaenia (25%), as well as from other rivulids and actinopterygian fish. These events could explain the great genome instability, the high genetic diversity, chromosome variability, as well as the morphological diversity in species of Austrolebias. Thus, species of this genus represent new model systems linking different evolutionary processes: drastic genome increase, massive TEs genomic representation, high chromosome instability, occurrence of natural hybridization between sister species, and burst speciation events.
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Affiliation(s)
| | | | - Néstor Ríos
- Sección Genética Evolutiva, Facultad de Ciencias, UdelaR, Montevideo, Uruguay
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4
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Protogynous functional hermaphroditism in the North American annual killifish, Millerichthys robustus. Sci Rep 2022; 12:9230. [PMID: 35654924 PMCID: PMC9163151 DOI: 10.1038/s41598-022-12947-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 05/19/2022] [Indexed: 11/09/2022] Open
Abstract
Sex change (sequential hermaphroditism) has evolved repeatedly in teleost fishes when demographic conditions mediate fundamentally different sex-specific returns for individuals of particular age and size. We investigated the conditions for potential sex change in an annual killifish (Millerichthys robustus) from temporary pools in Mexico. In natural populations, we detected adults with intersex colouration and gonads. Therefore, we experimentally tested whether this apparent sex change can be generated by manipulation of ecological and social conditions, rather than being caused by environmental disturbance. We demonstrated functional protogynous (female-to-male) sex change in 60% replicates, when groups of five females interacted and had a visual and olfactory cue of a male. Only one female changed sex in any given replicate. The sex change never occurred in isolated females. Protandrous (male-to-female) hermaphroditism was not recorded. We characterized gradual changes in behaviour, colouration and gonad structure during the sex change process. The first behavioural signs of sex change were observed after 23 days. Secondary males spawned successfully after 75 days. We discuss the adaptive potential of sex change in short-lived annual fishes through the seasonal decline of males, and during colonization of new habitats. This is the first observation of functional hermaphroditism in an annual killifish.
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5
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Domínguez-Castanedo O. Perceived mate competition risk influences the female mate choice and increases the reproductive effort in the annual killifish Millerichthys robustus. ETHOL ECOL EVOL 2022. [DOI: 10.1080/03949370.2021.1893827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Omar Domínguez-Castanedo
- Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana, Unidad Xochimilco, Calzada del Hueso No. 1100, Col. Villa Quietud, 04906 Coyoacán, CDMX, México
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6
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Reyes F, Quintana L, Tassino B. Association of androgens and estrogens with agonistic behavior in the annual fish Austrolebias reicherti. Horm Behav 2021; 136:105064. [PMID: 34653914 DOI: 10.1016/j.yhbeh.2021.105064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 09/10/2021] [Accepted: 09/20/2021] [Indexed: 11/18/2022]
Abstract
Agonistic behavior governs the settlement of conflicts among conspecifics for limiting resources. Sex steroids play a critical role in the regulation of agonistic behavior which in turn may produce modulations in hormone titres. In this study we analyzed the association of androgens and estrogens with agonistic behavior in the annual fish Austrolebias reicherti. This native species inhabits temporary ponds that dry out completely during summer, having one of the shortest lifespans among vertebrates. They are highly sexually dimorphic and have a single breeding season during which they reproduce continuously. Here we measured plasma levels of 11-ketotestosterone (11KT) and 17β-estradiol (E2) in adult males after the resolution of a social conflict and assessed the role of the aromatase conversion of testosterone (T) to E2 in male aggression. Winners had higher levels of 11KT than losers yet; winner 11KT levels did not differ from those of males not exposed to a social challenge. E2 levels did not show differences among winners, losers or control males. However, fights under the aromatase inhibitor Fadrozole were overall less aggressive than control fights. Our results suggest an androgen response to losing a conflict and that the conversion of T to E2 is involved in the regulation of aggressive behavior. Annual fish extreme life history may give new insights on hormone-behavior interactions.
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Affiliation(s)
- Federico Reyes
- Sección Etología, Facultad de Ciencias, Universidad de la República, Uruguay; Bases Neurales de la Conducta, Departamento de Neurofisiología Molecular y Celular, Instituto de Investigaciones Biológicas Clemente Estable, Ministerio de Educación y Cultura, Montevideo, Uruguay
| | - Laura Quintana
- Bases Neurales de la Conducta, Departamento de Neurofisiología Molecular y Celular, Instituto de Investigaciones Biológicas Clemente Estable, Ministerio de Educación y Cultura, Montevideo, Uruguay
| | - Bettina Tassino
- Sección Etología, Facultad de Ciencias, Universidad de la República, Uruguay.
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7
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Sowersby W, Eckerström-Liedholm S, Rowiński PK, Balogh J, Eiler S, Upstone JD, Gonzalez-Voyer A, Rogell B. The relative effects of pace of life-history and habitat characteristics on the evolution of sexual ornaments: A comparative assessment. Evolution 2021; 76:114-127. [PMID: 34545942 DOI: 10.1111/evo.14358] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 08/17/2021] [Accepted: 08/27/2021] [Indexed: 12/14/2022]
Abstract
Selection may favor greater investment into sexual ornaments when opportunities for future reproduction are limited, for example, under high adult mortality. However, predation, a key driver of mortality, typically selects against elaborate sexual ornaments. Here, we examine the evolution of sexual ornaments in killifishes, which have marked contrasts in life-history strategy among species and inhabit environments that differ in accessibility to aquatic predators. We first assessed if the size of sexual ornaments (unpaired fins) influenced swimming performance. Second, we investigated whether the evolution of larger ornamental fins is driven primarily by the pace of life-history (investment into current vs. future reproduction) or habitat type (a proxy for predation risk). We found that larger fins negatively affected swimming performance. Further, males from species inhabiting ephemeral habitats, with lower predation risk, had larger fins and greater sexual dimorphism in fin size, compared to males from more accessible permanent habitats. We show that enlarged ornamental fins, which impair locomotion, evolve more frequently in environments that are less accessible to predators, without clear associations to life-history strategy. Our results provide a rare link between the evolution of sexual ornaments, effects on locomotion performance, and natural selection on ornament size potentially through habitat differences in predation risk.
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Affiliation(s)
- Will Sowersby
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden.,Department of Biology and Geosciences, Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan
| | - Simon Eckerström-Liedholm
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden.,Wild Animal Initiative, Washington, D.C., 20010
| | - Piotr K Rowiński
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden
| | - Julia Balogh
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden
| | - Stefan Eiler
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden
| | - Joseph D Upstone
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden
| | - Alejandro Gonzalez-Voyer
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden.,Instituto de Ecología, Universidad Nacional Autónoma de México, México City, 04510, Mexico
| | - Björn Rogell
- Department of Zoology, Stockholm University, Stockholm, SE-11418, Sweden.,Department of Aquatic Resources, Institute of Freshwater Research, Swedish University of Agricultural Sciences, Drottningholm, SE-17893, Sweden
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8
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Domínguez-Castanedo O. Agonistic interactions with asymmetric body size in two adult-age groups of the annual killifish Millerichthys robustus (Miller & Hubbs, 1974). JOURNAL OF FISH BIOLOGY 2021; 99:773-781. [PMID: 33864699 DOI: 10.1111/jfb.14757] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 04/04/2021] [Accepted: 04/13/2021] [Indexed: 06/12/2023]
Abstract
In this study, the author evaluated two adult age groups of the Mexican rivulus Millerichthys robustus with body size asymmetries to determine the strategies used by an annual killifish during agonistic interactions of different ontogenetic stages. To achieve this goal, the author first characterized the ethogram of agonistic interactions of M. robustus composed of seven behavioural units in males and five behavioural units in females. The author then analysed agonistic interaction strategies used by males and females with body size asymmetries in two groups of different adult ages that represent different ontogenetic stages: (a) just after sexual maturity was reached, at 5 weeks of age, and (b) near natural death, at 24 weeks of age. The agonistic behaviour patterns of M. robustus were compatible with the logic of mutual assessment. Large males had an advantage during their interactions in both age groups, winning all of the encounters. Nonetheless, there was more aggression in 5-week-old fish encounters. In addition, small 24-week-old fish were more aggressive than small 5-week-old fish. These changing strategies may be because of the cost-benefits required during a fight at each ontogenetic stage. In the female encounters, size did not predict winners, as both small and large fish won a similar number of encounters, and some contests remained unresolved regardless of age group. There was a tendency for small females of any age to risk more than males in fights to maintain reproductive fitness.
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Affiliation(s)
- Omar Domínguez-Castanedo
- Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana unidad Xochimilco, Ciudad de México, Mexico
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9
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de Castro BD, Wingen NMDA, Dos Santos SHD, Godoy RS, Maltchik L, Lanés LEK, Oliveira GT. Biomarkers of oxidative stress in the post-embryonic characterization of the neotropical annual killifish. Biogerontology 2021; 22:507-530. [PMID: 34302586 DOI: 10.1007/s10522-021-09931-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/14/2021] [Indexed: 11/29/2022]
Abstract
Annual killifish are among the most remarkable extremophile species with the shortest vertebrate life span. Few studies have reported on the oxidative balance throughout their life cycle and its association to the natural aging process of these neotropical animals in a natural environment. We standardized and analyzed physiological markers related to the redox balance of the annual killifish (Cynopoecilus fulgens) throughout the post-embryonic life cycle (enzyme activity of Superoxide Dismutase, Catalase, Glutathione Peroxidase, and Glutathione S-transferase, as well as the determination of the levels of Lipoperoxidation, Carbonylated Proteins, and Total Proteins). We tested the influence of environmental variables on these biomarkers. Individuals were collected, including juveniles, adults, and seniles, in three sampling units around the Parque Nacional da Lagoa do Peixe, located in the Coastal Plain of Rio Grande do Sul. We observed that males and females used different physiological strategies of their redox balance during their life cycle, and their oxidative balance was influenced by their reproductive period and environmental variables (water temperature, abundance of predators, abundance of another sympatric annual killifish species, and abundance of C. fulgens). The population of each temporary pond presented different physiological responses to the adaptation of their life cycle, and there was an influence of environmental component as a modulator of this cycle. Our study offers reference values that will be useful for comparison in future research with short-lived organisms.
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Affiliation(s)
- Bruna Dutra de Castro
- Conservation Physiology Laboratory, School of Health and Life Sciences, PUCRS, Porto Alegre, RS, Brazil
| | | | | | - Robson Souza Godoy
- Laboratory of Ecology and Conservation of Aquatic Ecosystems, Health Sciences Center, UNISINOS, São Leopoldo, RS, Brazil
| | - Leonardo Maltchik
- Laboratory of Ecology and Conservation of Aquatic Ecosystems, Health Sciences Center, UNISINOS, São Leopoldo, RS, Brazil
| | - Luis Esteban Krause Lanés
- Conservation Physiology Laboratory, School of Health and Life Sciences, PUCRS, Porto Alegre, RS, Brazil
| | - Guendalina Turcato Oliveira
- Conservation Physiology Laboratory, School of Health and Life Sciences, PUCRS, Porto Alegre, RS, Brazil.
- Conservation Physiology Laboratory, Department of Morphophysiological Sciences, School of Health and Life Sciences, Pontifical Catholic University of Rio Grande Do Sul, Ipiranga Avenue, 6681 Pd. 12, Block C, class 270, Porto Alegre, RS, 90619-900, Brazil.
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10
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Okuzaki Y. Effects of body size divergence on male mating tactics in the ground beetle Carabus japonicus. Evolution 2021; 75:2269-2285. [PMID: 34231214 DOI: 10.1111/evo.14302] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 05/14/2021] [Accepted: 05/18/2021] [Indexed: 11/27/2022]
Abstract
Animal body size is involved in reproduction in various ways. Carabus japonicus exhibits considerable variation in adult body size across geographical locations depending on the larval environment. To investigate the effects of body size divergence on male mating traits, spermatophore deposition and weight, copulation duration, and post-copulatory mounting were observed using male-female pairs from C. japonicus populations with different body sizes. Then, variables with high predictive power on the mating traits were identified from individual characteristics. When the male was slightly smaller than his mate, spermatophore deposition likely succeeded, suggesting that mechanical size-assortative insemination determined male body size. Although male reproductive organ size was positively correlated with male body size, spermatophore weight was not significantly affected by male body size, whereas copulation duration decreased with increasing male body size. Enlarged males, with a high capacity for spermatophore production, could increase paternity by decreasing copulation duration and increasing mating frequency. Such shifts in mating tactics would alter selection pressures of intra- and intersexual interactions (e.g., sperm competition and sexual conflict). Genital dimensions also affected mating traits other than copulatory duration. Thus, ecological heterogeneity has the potential to lead to divergences in sexual traits, such as genital morphology, through body size divergence.
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Affiliation(s)
- Yutaka Okuzaki
- Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo, Japan
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11
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Female lined seahorses (Hippocampus erectus) recognize their mates based on olfactory cues. Behav Processes 2021; 189:104419. [PMID: 33991591 DOI: 10.1016/j.beproc.2021.104419] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 04/21/2021] [Accepted: 05/10/2021] [Indexed: 11/24/2022]
Abstract
Recognition of mates from others is crucial for monogamous species to maintain their long-term pair bonds. The seahorse is widely recognized as a monogamous species, and its mate recognition cue is still not well understood. In the present study, we used the lined seahorse (Hippocampus erectus) as an experimental animal and investigated the effect of blocking olfactory, visual or behavioral (i.e., greeting) cues on mate recognition. Our results show that as long as the female seahorse can smell her mate, she will remain faithful to her mate and persistently select her mate as her next mating partner, regardless of whether the visual and/or behavioral cues between her and her mate are blocked. This finding implies that olfaction is a critical cue for a female seahorse to recognize her mate.
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12
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Domínguez-Castanedo O, Muñoz-Campos TM, Valdesalici S, Valdez-Carbajal S, Passos C. Male mate choice in the annual killifish Millerichthys robustus and its relationship with female polymorphism, size and fecundity. ETHOL ECOL EVOL 2021. [DOI: 10.1080/03949370.2021.1883121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Omar Domínguez-Castanedo
- Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana, Unidad Xochimilco, Calzada del Hueso No. 1100, Col. Villa Quietud, Coyoacán, CDMX 04906, México
| | - Tessy M. Muñoz-Campos
- Licenciatura En Biología, Universidad Autónoma Metropolitana, Unidad Xochimilco, Calzada del Hueso No. 1100, Col. Villa Quietud, Coyoacán, CDMX 04906, México
| | - Stefano Valdesalici
- Associazione Italiana Killifish, Via Cà Bertacchi 5, 42030 Viano (Reggio Emilia), Italy
| | - Sharon Valdez-Carbajal
- Licenciatura En Biología, Universidad Autónoma Metropolitana, Unidad Xochimilco, Calzada del Hueso No. 1100, Col. Villa Quietud, Coyoacán, CDMX 04906, México
| | - Carlos Passos
- Sección de Etología, Facultad de Ciencias, Universidad de la Republica, Iguá 4225, Montevideo 11400, Uruguay
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13
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Munyandamutsa PS, Jere WL, Kassam D, Mtethiwa A. Trophic divergence of Lake Kivu cichlid fishes along a pelagic versus littoral habitat axis. Ecol Evol 2021; 11:1570-1585. [PMID: 33613990 PMCID: PMC7882941 DOI: 10.1002/ece3.7117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 11/05/2020] [Accepted: 11/06/2020] [Indexed: 01/16/2023] Open
Abstract
Local adaptation to the littoral and pelagic zones in two cichlid haplochromine fish species from Lake Kivu was investigated using morphometrics. Cranial variation and inferred jaw mechanics in both sexes of the two species across the two habitat types were quantified and compared. Comparisons of littoral versus pelagic populations revealed habitat-specific differences in the shape of the feeding apparatus. Also, kinematic transmission of the anterior jaw four-bar linkage that promotes greater jaw protrusion was higher in the pelagic zone than in the littoral zone for both species. Inferred bite force was likewise higher in pelagic zone fish. There were also sex-specific differences in craniofacial morphology as males exhibited longer heads than females in both habitats. As has been described for other cichlids in the East African Great Lakes, local adaptation to trophic resources in the littoral and pelagic habitats characterizes these two Lake Kivu cichlids. Similar studies involving other types of the Lake Kivu fishes are recommended to test the evidence of the observed trophic patterns and their genetic basis of divergences.
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Affiliation(s)
- Philippe S. Munyandamutsa
- Africa Centre of Excellence in Aquaculture and Fisheries ScienceDepartment of Aquaculture and Fisheries ScienceBunda CollegeLilongwe University of Agriculture and Natural ResourcesLilongweCentreMalawi
- Department of Animal ProductionCollege of Agriculture, Animal Sciences and Veterinary MedicineUniversity of RwandaKK 737MusanzeNorthRwanda
| | - Wilson L. Jere
- Africa Centre of Excellence in Aquaculture and Fisheries ScienceDepartment of Aquaculture and Fisheries ScienceBunda CollegeLilongwe University of Agriculture and Natural ResourcesLilongweCentreMalawi
| | - Daud Kassam
- Africa Centre of Excellence in Aquaculture and Fisheries ScienceDepartment of Aquaculture and Fisheries ScienceBunda CollegeLilongwe University of Agriculture and Natural ResourcesLilongweCentreMalawi
| | - Austin Mtethiwa
- Africa Centre of Excellence in Aquaculture and Fisheries ScienceDepartment of Aquaculture and Fisheries ScienceBunda CollegeLilongwe University of Agriculture and Natural ResourcesLilongweCentreMalawi
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14
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Sumarto BKA, Kobayashi H, Kakioka R, Tanaka R, Maeda K, Tran HD, Koizumi N, Morioka S, Bounsong V, Watanabe K, Musikasinthorn P, Tun S, Yun LKC, Anoop VK, Raghavan R, Masengi KWA, Fujimoto S, Yamahira K. Latitudinal variation in sexual dimorphism in a freshwater fish group. Biol J Linn Soc Lond 2020. [DOI: 10.1093/biolinnean/blaa166] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Abstract
Tropical animals are characterized by showy ornaments and conspicuous body colours as compared with their temperate relatives. Some recent studies have hypothesized that sexual selection pressures are stronger in the tropics than in the temperate zone. Although negative correlations between latitude and the degree of sexual dimorphism would support this hypothesis, phylogeny should be taken into account in such comparative studies. Comparisons of the degree of sexual dimorphism in body size and fin lengths among species of the Adrianichthyidae, a freshwater fish family having a wide geographical range throughout Southeast and East Asia, revealed that lower latitude species are sexually more dimorphic in all characters than higher latitude species. Phylogenetic generalized least squares analyses using a mitochondrial DNA phylogeny demonstrated that the negative correlations between latitude and the degree of sexual dimorphism become non-significant when phylogeny is considered, but that the variance in the degree of sexual dimorphism is explained not only by phylogeny but also almost equally by latitude. Ancestral state reconstruction indicated that sexual dimorphisms have evolved independently even within major clades. These findings are consistent with the view that tropical species are exposed to stronger sexual selection pressures than temperate species. We discuss possible causes of the latitudinal variation in sexual selection pressure.
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Affiliation(s)
- Bayu K A Sumarto
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, Japan
| | - Hirozumi Kobayashi
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, Japan
| | - Ryo Kakioka
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, Japan
| | - Rieko Tanaka
- World Medaka Aquarium, Nagoya Higashiyama Zoo and Botanical Gardens, Nagoya, Japan
| | - Ken Maeda
- Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
| | - Hau D Tran
- Faculty of Biology, Hanoi National University of Education, Hanoi, Vietnam
| | - Noriyuki Koizumi
- Institute for Rural Engineering, National Agriculture and Food Research Organization, Ibaraki, Japan
| | - Shinsuke Morioka
- Fisheries Division, Japan International Research Center for Agricultural Sciences, Ibaraki, Japan
| | | | | | | | - Sein Tun
- Inlay Lake Wildlife Sanctuary, Nature and Wildlife Conservation Division, Forest Department, Ministry of Natural Resources and Environmental Conservation, Myanmar
| | - L K C Yun
- Inlay Lake Wildlife Sanctuary, Nature and Wildlife Conservation Division, Forest Department, Ministry of Natural Resources and Environmental Conservation, Myanmar
| | - V K Anoop
- School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Kochi, India
| | - Rajeev Raghavan
- Department of Fisheries Resource Management, Kerala University of Fisheries and Ocean Studies, Kochi, India
| | | | - Shingo Fujimoto
- Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Kazunori Yamahira
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, Japan
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15
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Aich U, Bonnet T, Fox RJ, Jennions MD. An experimental test to separate the effects of male age and mating history on female mate choice. Behav Ecol 2020. [DOI: 10.1093/beheco/araa092] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Abstract
Should females prefer older males as mates? Male survival to old age might indicate the presence of fitness-enhancing genes that increase offspring fitness. However, many correlational studies show that mating with older males can lower female fecundity and even reduce offspring fitness due to epigenetic or germline mutation effects. One problem in quantifying female choice based on male age is that age is usually confounded with mating history. This begs a question: Do females choose males based on their age or their mating history? The answer requires an experimental approach, but few such studies exist. Here, we test if experimentally induced variation in the mating history of old and young males (12-week difference in postmaturity age) affects female choice in the eastern mosquitofish (Gambusia holbrooki). To vary mating history, adult males were either allowed to freely mate with females for 3 weeks or they only had visual contact with females. Immediately thereafter, we ran four-choice mating trials, using association time, to test the effects of male age and mating history (2 × 2 design) on male attractiveness. Females did not show a clear preference for males based on either characteristic. This was not due to a lack of female choice: females spent significantly more time with larger males. In addition, female choice was significantly repeatable across four trials: twice as a virgin and twice as a nonvirgin. Finally, female mating status (virgin or nonvirgin) did not affect her choice of mate, although virgin females spent significantly more time associating with test males.
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Affiliation(s)
- Upama Aich
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Acton, Canberra, ACT, Australia
| | - Timothee Bonnet
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Acton, Canberra, ACT, Australia
| | - Rebecca J Fox
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Acton, Canberra, ACT, Australia
| | - Michael D Jennions
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Acton, Canberra, ACT, Australia
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16
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Hubená P, Horký P, Slavík O. Test-dependent expression of behavioral syndromes: A study of aggressiveness, activity, and stress of chub. Aggress Behav 2020; 46:412-424. [PMID: 32542801 DOI: 10.1002/ab.21909] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 05/19/2020] [Accepted: 06/04/2020] [Indexed: 11/09/2022]
Abstract
Aggressiveness has been one of the behavioral traits most examined with various standard testing methods. We used two distinct methods (the mirror and the real opponent tests) to evaluate individual aggression and relate it to the activity and individual stress of chub (Squalius cephalus L.). Three hypotheses were formulated and tested: (a) there is a significant positive relationship between the aggressiveness of individuals measured with the mirror and the real opponent tests, indicating their convergent validity; (b) the irregularities in response to the aggressiveness and activity tests lead to the context-specific expression of the behavioral syndromes; and (c) there is a significant positive relationship between the stress induced in individuals by both tests of aggressiveness, demonstrating individually consistent stress-coping strategies. The first and the second hypothesis were confirmed, while the third hypothesis was rejected. Our results suggest that particular tests of aggressiveness could act as a situation with high strength, leaving little variation between individual responses. Thus, we propose that for the proper interpretation of various studies using different tests to study identical behavioral traits, it is important to consider the convergent validity of not only the tested behavioral traits but also the individual stress responses. The chub also showed stress relieve through aggressiveness, suggesting the species as a prospective animal model to the study interaction between the stress and the aggressiveness. A detailed aggression ethogram of chub was provided to facilitate the use of this specie in future studies.
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Affiliation(s)
- Pavla Hubená
- Department of Zoology and FisheriesCzech University of Life Sciences Prague Prague Suchdol Czech Republic
| | - Pavel Horký
- Department of Zoology and FisheriesCzech University of Life Sciences Prague Prague Suchdol Czech Republic
| | - Ondřej Slavík
- Department of Zoology and FisheriesCzech University of Life Sciences Prague Prague Suchdol Czech Republic
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17
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García D, Reichard M. The effect of population density on growth and survival of a Neotropical annual killifish. JOURNAL OF FISH BIOLOGY 2020; 97:298-301. [PMID: 32337709 DOI: 10.1111/jfb.14357] [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: 12/18/2019] [Revised: 03/25/2020] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
We used a field experiment to test the effects of population density on the growth rate and survival of Austrolebias bellottii, a Neotropical annual killifish. Effects differed between the sexes: males at high densities achieved a smaller final size and experienced higher mortality while no such effects were observed in females. This sex-specific effect could be an indirect consequence of mate competition.
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Affiliation(s)
- Daniel García
- Departamento de Ecología y Biología Evolutiva, IIBCE, Montevideo, Uruguay
- Departamento de Ecología y Evolución, Facultad de Ciencias, UdelaR, Montevideo, Uruguay
| | - Martin Reichard
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic
- Department of Botany and Zoology, Masaryk University, Brno, Czech Republic
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18
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Amino K, Matsuo T. Intra- Versus Inter-Sexual Selection on Sexually Dimorphic Traits in Drosophila prolongata. Zoolog Sci 2020; 37:210-216. [PMID: 32549535 DOI: 10.2108/zs200010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 03/10/2020] [Indexed: 11/17/2022]
Abstract
Sexual dimorphism, such as sexual size dimorphism (SSD) and sexually dimorphic exaggerated traits, often evolves via sexual selection. In many species, evolution of sexual dimorphism is thought to be driven by either of the two forms of sexual selection: intra- and inter-sexual selection. In some species, however, intra- and inter-sexual selection act simultaneously on the same sexually dimorphic trait. Therefore, it is important to consider the effects of both forms of sexual selection to fully understand the evolution of sexual dimorphism. Drosophila prolongata is a fruit fly that shows male-biased SSD and has enlarged forelegs only in males. In this study, the relationship between body size parameters and aggression/mating behavior was examined. Our results showed that aggressive behavior was influenced by body weight and foreleg size, whereas mating success was not influenced by any size parameters, suggesting that intra-sexual selection is the primary mechanism that maintains the sexual dimorphism in the current D. prolongata population.
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Affiliation(s)
- Kai Amino
- Laboratory of Applied Entomology, Department of Agricultural and Environmental Biology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Takashi Matsuo
- Laboratory of Applied Entomology, Department of Agricultural and Environmental Biology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan,
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19
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Age-associated liver alterations in wild populations of Austrolebias minuano, a short-lived Neotropical annual killifish. Biogerontology 2019; 20:687-698. [DOI: 10.1007/s10522-019-09822-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 07/10/2019] [Indexed: 01/09/2023]
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20
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Male mate choice in the annual fish Austrolebias reicherti (Cyprinodontiformes: Rivulidae): when size matters. J ETHOL 2019. [DOI: 10.1007/s10164-019-00601-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Reyes Blengini F, Tassino B, Passos C. Females of the annual killifish Austrolebias reicherti (Cyprinodontiformes: Rivulidae) recognize conspecific mates based upon chemical cues. Behav Processes 2018; 155:33-37. [DOI: 10.1016/j.beproc.2017.08.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 07/05/2017] [Accepted: 08/13/2017] [Indexed: 12/16/2022]
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22
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Reichard M, Lanés LEK, Polačik M, Blažek R, Vrtílek M, Godoy RS, Maltchik L. Avian predation mediates size-specific survival in a Neotropical annual fish: a field experiment. Biol J Linn Soc Lond 2018. [DOI: 10.1093/biolinnean/bly022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Martin Reichard
- The Czech Academy of Science, Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná, Brno, Czech Republic
| | - Luis E K Lanés
- Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos, Universidade do Vale do Rio dos Sinos, Bairro Cristo Rei, São Leopoldo, Rio Grande do Sul, Brazil
- Instituto Pró-Pampa – IPPAMPA, Bairro Centro, Pelotas, Rio Grande do Sul, Brazil
| | - Matej Polačik
- The Czech Academy of Science, Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná, Brno, Czech Republic
| | - Radim Blažek
- The Czech Academy of Science, Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná, Brno, Czech Republic
| | - Milan Vrtílek
- The Czech Academy of Science, Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná, Brno, Czech Republic
| | - Robson S Godoy
- Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos, Universidade do Vale do Rio dos Sinos, Bairro Cristo Rei, São Leopoldo, Rio Grande do Sul, Brazil
| | - Leonardo Maltchik
- Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos, Universidade do Vale do Rio dos Sinos, Bairro Cristo Rei, São Leopoldo, Rio Grande do Sul, Brazil
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23
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Loureiro M, Sá RD, Serra SW, Alonso F, Lanés LEK, Volcan MV, Calviño P, Nielsen D, Duarte A, Garcia G. Review of the family Rivulidae (Cyprinodontiformes, Aplocheiloidei) and a molecular and morphological phylogeny of the annual fish genus Austrolebias Costa 1998. NEOTROPICAL ICHTHYOLOGY 2018. [DOI: 10.1590/1982-0224-20180007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT The family Rivulidae is the fourth most diverse clade of Neotropical fishes. Together with some genera of the related African family Nothobranchiidae, many rivulids exhibit a characteristic annual life cycle, with diapausing eggs and delayed embryonic development, which allows them to survive in the challenging seasonal ponds that they inhabit. Rivulidae also includes two species known as the only the self-fertilizing vertebrates and some species with internal fertilization. The first goal of this article is to review the systematics of the family considering phylogenetic relationships and synapomorphies of subfamilial clades, thus unifying information that is dispersed throughout the literature. From this revision, it is clear that phylogenetic relationships within Rivulidae are poorly resolved, especially in one of the large clades that compose it, the subfamily Rivulinae, where conflicting hypotheses of relationships of non-annual and annual genera are evident. The second goal of this work is to present an updated phylogenetic hypothesis (based on mitochondrial, nuclear, and morphological information) for one of the most speciose genus of Rivulidae, Austrolebias. Our results confirm the monophyly of the genus and of some subgeneric clades already diagnosed, but propose new relationships among them and their species composition, particularly in the subgenus Acrolebias.
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Affiliation(s)
| | | | | | - Felipe Alonso
- CONICET, Argentina; Grupo de Investigación y Conservación de Killis, Argentina
| | | | | | - Pablo Calviño
- Grupo de Investigación y Conservación de Killis, Argentina
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24
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Torres-Pérez M, Rosillo JC, Berrosteguieta I, Olivera-Bravo S, Casanova G, García-Verdugo JM, Fernández AS. Stem cells distribution, cellular proliferation and migration in the adult Austrolebias charrua brain. Brain Res 2017; 1673:11-22. [DOI: 10.1016/j.brainres.2017.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 07/27/2017] [Accepted: 08/03/2017] [Indexed: 12/18/2022]
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25
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Berois N, Garcia G, De Sá RO. A global community effort to decipher the unique biology of annual killifish. Dev Dyn 2017; 246:807-811. [PMID: 28608511 DOI: 10.1002/dvdy.24533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 05/18/2017] [Accepted: 05/23/2017] [Indexed: 11/06/2022] Open
Abstract
Over the past 50 years, annual killifishes arose as alternative model organisms for studies of vertebrate biology. The annual fish offers exceptional advantages for studies of genetics, genomics, developmental biology, population dynamics, ecology, biogeography, and evolution. They inhabit extremely variable freshwater environments in Africa and South America, have a short lifespan and a set of unique and fascinating developmental characteristics. Embryos survive within the dry substrate during the dry season, whereas the adult population dies. Thus, the survival of the populations is entirely dependent on the buried embryos that hatch the next rainy season. Although Old and New World species share similarities in their life cycle, they also have different adaptive responses associated with climate-related selective pressures. Therefore, contrasting different species from these areas is essential to understand unique adaptations to heterogeneous environment. A network of laboratories (United States, Czech Republic, Italy, Brazil, Chile, and Uruguay) is working and collaborating on many aspects of the biology of annual fishes. Participating researchers share projects and cross-training undergraduate and graduate students. These efforts resulted in two International Symposia (2010 and 2015) that took place in Montevideo and an international book. Herein, we summarize the progress made by this global community of scientists. Developmental Dynamics 246:807-811, 2017. © 2017 Wiley Periodicals, Inc.
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26
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Van Eeckhoven J, Huyghe K, Van Damme R. Artificial selection in guppies: male and female phenotypes produced by inter‐ and intrasexual selection. J Zool (1987) 2017. [DOI: 10.1111/jzo.12475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Van Eeckhoven
- Research group of Functional Morphology Department of Biology University of Antwerp Wilrijk Belgium
| | - K. Huyghe
- Research group of Functional Morphology Department of Biology University of Antwerp Wilrijk Belgium
| | - R. Van Damme
- Research group of Functional Morphology Department of Biology University of Antwerp Wilrijk Belgium
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27
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Cellerino A, Valenzano DR, Reichard M. From the bush to the bench: the annual
Nothobranchius
fishes as a new model system in biology. Biol Rev Camb Philos Soc 2015; 91:511-33. [DOI: 10.1111/brv.12183] [Citation(s) in RCA: 165] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 03/04/2015] [Accepted: 03/13/2015] [Indexed: 02/01/2023]
Affiliation(s)
- Alessandro Cellerino
- Bio@SNS, Scuola Normale Superiore Department of Neurosciences Piazza dei Cavalieri 7 56126 Pisa Italy
- Fritz Lipmann Institute for Age Research, Leibniz Institute Beutenbergstr. 11 D‐07745 Jena Germany
| | - Dario R. Valenzano
- Max Planck Institute for Biology of Ageing Joseph‐Stelzmann‐Str. 9b D‐50931 Cologne Germany
| | - Martin Reichard
- Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic Květná 8 603 65 Brno Czech Republic
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28
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Hermann CM, Brudermann V, Zimmermann H, Vollmann J, Sefc KM. Female preferences for male traits and territory characteristics in the cichlid fish Tropheus moorii. HYDROBIOLOGIA 2015; 748:61-74. [PMID: 25983339 PMCID: PMC4430825 DOI: 10.1007/s10750-014-1892-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Female mate preferences for male traits and resource characteristics affect trait evolution and diversification. Here, we test the effects of male body traits and territory characteristics on within-population female preferences and on population-assortative mating in the cichlid Tropheus moorii. Within-population preferences of females were independent of male body size, coloration and territory size but were strongly dependent on territory quality and co-varied with male courtship activity. Courtship activity of individual males was contingent on the quality of their assigned territory, and therefore, courtship may not only indicate intrinsic male quality. On the basis of these results we suggest that female preferences for high-quality territories reinforce the outcome of malemale competition and ensure male mating success. Mating preferences of females for males of their own color variant (ascertained in a previous experiment) were not overturned when males of another color variant were presented in a superior territory, indicating that within- and between-population mate preferences of females depend on different cues.
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Affiliation(s)
- Caroline M Hermann
- Department of Zoology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Verena Brudermann
- Department of Zoology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Holger Zimmermann
- Department of Zoology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Johann Vollmann
- Division of Plant Breeding, Department of Crop Sciences, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad Lorenz Str. 24, 3430 Tulln, Austria
| | - Kristina M Sefc
- Department of Zoology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
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29
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Passos C, Tassino B, Reyes F, Rosenthal GG. Seasonal variation in female mate choice and operational sex ratio in wild populations of an annual fish, Austrolebias reicherti. PLoS One 2014; 9:e101649. [PMID: 25029019 PMCID: PMC4100733 DOI: 10.1371/journal.pone.0101649] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 06/09/2014] [Indexed: 12/04/2022] Open
Abstract
The intensity of mating competition and the potential benefits for female of mating with certain males can be influenced by several extrinsic factors, such that behavioral decisions can be highly context-dependent. Short-lived species with a single reproductive season are a unique model to study context-sensitive mating decisions. Through exhaustive sampling in the field and simultaneous choice tests in the laboratory, we evaluated operational sex ratio (OSR) and female mate choice at the beginning and end of the reproductive season in the annual killifish Austrolebias reicherti. We found seasonal change in both OSR and female mate choice. At the start of the reproductive season the OSR did not deviate from parity, and females preferred larger males. Later in the reproductive season, while the proportion of males in the ponds decreased, females became unselective with respect to male size. The particular biological cycle of annual killifish, where both life expectancy and mating opportunities decline sharply over a short timescale, could account for the seasonal change in female choice. Reduction in choosiness could arise from diminished reproductive prospects due to a decline in male availability. Moreover, as the end of the season approaches, any benefits of choosiness are presumably reduced: a female’s fitness will be higher if she mates with any male than if she forgoes reproduction and dies. Future work will disentangle the mechanisms underlying seasonal changes in mating preferences, notably direct responses to demographic factors, environmental cues, or intrinsic changes during development.
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Affiliation(s)
- Carlos Passos
- Sección Etología, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
- * E-mail:
| | - Bettina Tassino
- Sección Etología, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Federico Reyes
- Sección Etología, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Gil G. Rosenthal
- Department of Biology, Texas A&M University, College Station, Texas, United States of America
- Centro de Investigaciones Científicas de las Huastecas “Aguazarca,” Calnali, Hidalgo, México
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30
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Evolution of body colouration in killifishes (Cyprinodontiformes: Aplocheilidae, Nothobranchiidae, Rivulidae): Is male ornamentation constrained by intersexual genetic correlation? ZOOL ANZ 2014. [DOI: 10.1016/j.jcz.2013.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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31
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García G, Gutiérrez V, Ríos N, Turner B, Santiñaque F, López-Carro B, Folle G. Burst speciation processes and genomic expansion in the neotropical annual killifish genus Austrolebias (Cyprinodontiformes, Rivulidae). Genetica 2014; 142:87-98. [DOI: 10.1007/s10709-014-9756-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 01/10/2014] [Indexed: 10/25/2022]
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32
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Fonseca APD, Volcan MV, Sampaio LA, Romano LA, Robaldo RB. Growth of Critically Endangered annual fish Austrolebias wolterstorffi (Cyprinodontiformes: Rivulidae) at different temperatures. NEOTROPICAL ICHTHYOLOGY 2013. [DOI: 10.1590/s1679-62252013000400012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Given the importance of knowledge of the biology of endangered species for the planning of conservation and management efforts, the aim of this study was to investigate the influence of temperature on the growth of Austrolebias wolterstorffi (Ahl, 1924). To clarify the thermal influence on the growth of the species, temperatures of 16, 20, 24 , and 28°C were tested in triplicate. The present study showed that a water temperature of 28°C is detrimental to the growth of the species. Among the other tested temperatures, it was found that the optimum temperature for growth decreases as an individual ages and is slightly lower for females. It was demonstrated here that males reach a higher weight and length, and grow faster than females, reaching sexual maturity earlier. To optimize the growth of this species in captivity, the ideal temperature of the water during the initial life period is 24°C, until after puberty when the temperature should decrease to about 21°C.
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