1
|
Hasegawa Y, Mine K, Hirasaka K, Yokouchi K, Kawabata Y. How Japanese eels escape from the stomach of a predatory fish. Curr Biol 2024; 34:R812-R813. [PMID: 39255761 DOI: 10.1016/j.cub.2024.07.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 06/27/2024] [Accepted: 07/03/2024] [Indexed: 09/12/2024]
Abstract
Predation shapes diversity in the defensive tactics of prey. One specialized defensive tactic is to escape the digestive system of the predator after capture1,2,3,4,5,6,7,8. While most of these defensive tactics involve passive ejection alive from predators' mouths and vents1,2,3,4,5, active escape from the digestive tracts of predators has recently been observed in certain invertebrate species6,7 and fish8. However, no study has yet uncovered the behavioral patterns and escape routes of the prey within a predator's digestive tract. Here, we report the sequential escape processes of the Japanese eel Anguilla japonica from capture to escape via the gills of predatory fish Odontobutis obscura using an X-ray video system. All captured eels had at least one portion of their bodies swallowed into the stomach of the predator. Surprisingly, after being swallowed, most individuals attempted to escape by going back up the digestive tract towards the esophagus and gill, and some of them succeeded in escaping via the predator's gill. Some eels, whose entire bodies were completely inside the stomach, exhibited circling behavior along the stomach, seemingly searching for possible escape routes. An electro-anesthetization experiment revealed that eels utilize various escape routes through gill clefts, rather than just one.
Collapse
Affiliation(s)
- Yuha Hasegawa
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan.
| | - Kazuki Mine
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
| | - Katsuya Hirasaka
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
| | - Kazuki Yokouchi
- Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Yokohama 236-8648, Japan
| | - Yuuki Kawabata
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan.
| |
Collapse
|
2
|
Juhász A, Majoros G. A proposed ectochory of Galba truncatula snails between wallow sites enhances transmission of Fascioloides magna at gemenc, in Hungary. Int J Parasitol Parasites Wildl 2023; 21:219-223. [PMID: 37441229 PMCID: PMC10333104 DOI: 10.1016/j.ijppaw.2023.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 07/15/2023]
Abstract
Each year temporary puddles are formed on compacted earth roads as a consequence of heavy rains and subsequent flooding in the large floodplain forests of the Danube River, Hungary, Central Europe, Hungary. After the receding of floodwaters, the muddy puddles persist from spring to mid-fall, where they are densely populated by Galba truncatula snails on an annual basis. These snails are the sole intermediate host of Fascioloides magna liver fluke of deer in the forest. According to field observations, G. truncatula is a very rare species on banks of river branches and lakes within the forest but always appears in large aggregations in these semi-natural potholes. Red deer (Cervus elaphus) leave their droppings in puddles while they wallow in the mud, therefore the snails encounter the miracidia of F. magna frequently. Snails are not able to dig themselves into the tamp soil of roads therefore they are destroyed by the wheels of vehicles which drive down the roads from autumn to the end of winter. Therefore, snails colonize these puddles regularly every spring. Since there is no connection between the distant puddles, it is supposed that deer and wild boars repeatedly introduce the snails into the puddles each year carrying snails with the help of mud, which is stuck on their fur while they wallow. This method of transport is supported by the fact that shell remnants of snails can be found on the bark of rubbing trunks situated nearby wallows. It seems that the sequential creation of wallow sites and the repeated introduction of G. truncatula enhance the likelihood for the trematode to infect both hosts.
Collapse
Affiliation(s)
- Alexandra Juhász
- Department of Tropical Disease Biology, Liverpool School of Tropical Medicine, Liverpool, L3 5QA, UK
- Institute of Medical Microbiology, Semmelweis University, H-1089, Budapest, Hungary
| | - Gábor Majoros
- Private Scholar, István Str. 49., H-1078, Budapest, Hungary
| |
Collapse
|
3
|
Garcia F, Paz-Vinas I, Gaujard A, Olden JD, Cucherousset J. Multiple lines and levels of evidence for avian zoochory promoting fish colonization of artificial lakes. Biol Lett 2023; 19:20220533. [PMID: 36946133 PMCID: PMC10031398 DOI: 10.1098/rsbl.2022.0533] [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: 11/15/2022] [Accepted: 03/01/2023] [Indexed: 03/23/2023] Open
Abstract
Understanding how obligate freshwater organisms colonize seemingly isolated ecosystems has long fascinated ecologists. While recent investigations reveal that fish eggs can survive the digestive tract of birds and successfully hatch once deposited, evidence for avian zoochory in natura is still lacking. Here, we used a 'multiple lines and levels of evidence' approach to demonstrate possible bird-mediated colonization of lakes by the European perch (Perca fluviatilis). We studied a set of newly-formed and isolated artificial lakes that the public is either prohibited to access because of gravel extraction or allowed to access (mainly for angling). The motivating observation is that a large proportion of prohibited-access lakes (greater than 80%) were colonized by European perch even though stocking by anglers and managers never occurred. Three supplementary lines of evidence supported avian zoochory. First, European perch spawning occurs when waterfowl abundance is very high. Second, European perch lays sticky eggs at shallow depths where they can be eaten by waterfowls or attached to their bodies. Third, genetic analyses suggested that European perch actually migrate among lakes, and that distances moved match with daily flight range of foraging waterfowl. Together, multiple lines of evidence point to avian zoochory as a probable pathway for fish colonizing remote or newly-formed freshwater ecosystems.
Collapse
Affiliation(s)
- Flavien Garcia
- UMR 5174 EDB (Laboratoire Évolution et Diversité Biologique), CNRS, Université Toulouse III Paul Sabatier, IRD, 31062 Toulouse, France
| | - Ivan Paz-Vinas
- UMR 5174 EDB (Laboratoire Évolution et Diversité Biologique), CNRS, Université Toulouse III Paul Sabatier, IRD, 31062 Toulouse, France
| | - Arnaud Gaujard
- Fédération des Chasseurs de Haute-Garonne, 17 Avenue Jean Gonord, BP 5861, 31506 Toulouse Cedex 5, France
| | - Julian D. Olden
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195, USA
| | - Julien Cucherousset
- UMR 5174 EDB (Laboratoire Évolution et Diversité Biologique), CNRS, Université Toulouse III Paul Sabatier, IRD, 31062 Toulouse, France
| |
Collapse
|
4
|
Silva GG, Pizo MA, Green AJ, Sebastián‐González E, Bugoni L, Maltchik L. A waterfowl seed‐dispersal network from the Neotropical region is nested and modular. Biotropica 2023. [DOI: 10.1111/btp.13202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Affiliation(s)
- Giliandro G. Silva
- Graduate Program in Biology of Continental Aquatic Environments Universidade Federal do Rio Grande – FURG Rio Grande Brazil
| | - Marco Aurélio Pizo
- Department of Biodiversity, Institute of Biosciences Universidade Estadual Paulista Rio Claro Brazil
| | - Andy J. Green
- Department of Wetland Ecology Estación Biológica de Doñana (EBD‐CSIC) Sevilla Spain
| | | | - Leandro Bugoni
- Graduate Program in Biology of Continental Aquatic Environments Universidade Federal do Rio Grande – FURG Rio Grande Brazil
| | - Leonardo Maltchik
- Graduate Program in Biology of Continental Aquatic Environments Universidade Federal do Rio Grande – FURG Rio Grande Brazil
| |
Collapse
|
5
|
Silva BM, Moreira LFB, Vendramin D, Stenert C, Rocha O, Maltchik L. Using topsoil translocation from natural wetlands to restore rice field systems. Restor Ecol 2022. [DOI: 10.1111/rec.13526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruna M. Silva
- Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos Universidade do Vale do Rio dos Sinos, UNISINOS Av. Unisinos, 950, CEP 93.022‐750 São Leopoldo RS Brazil
| | - Leonardo F. B. Moreira
- Instituto de Biociências, Universidade Federal de Mato Grosso, UFMT Av. Fernando Corrêa da Costa, 2367, CEP 78.060‐900 Cuiabá MT Brazil
| | - Daiane Vendramin
- Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos Universidade do Vale do Rio dos Sinos, UNISINOS Av. Unisinos, 950, CEP 93.022‐750 São Leopoldo RS Brazil
| | - Cristina Stenert
- Laboratório de Ecologia e Conservação de Ecossistemas Aquáticos Universidade do Vale do Rio dos Sinos, UNISINOS Av. Unisinos, 950, CEP 93.022‐750 São Leopoldo RS Brazil
| | - Odete Rocha
- Departamento de Ecologia e Biologia Evolutiva Universidade Federal de São Carlos, UFSCar Via Washington Luiz, Km 235, CEP 13.565‐905 São Carlos SP Brazil
- Programa de Pós‐Graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos, UFSCar Via Washington Luiz, Km 235, CEP 13.565‐905 São Carlos SP Brazil
| | - Leonardo Maltchik
- Programa de Pós‐Graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos, UFSCar Via Washington Luiz, Km 235, CEP 13.565‐905 São Carlos SP Brazil
- Programa de Pós‐Graduação em Biologia de Ambientes Aquáticos Continentais, Universidade Federal do Rio Grande, FURG Av. Itália, Km 8, CEP 96.203‐900 Rio Grande RS Brazil
| |
Collapse
|
6
|
Barboza LC, Silva GG, Green AJ, Maltchik L, Stenert C. Potential dispersal of aquatic snails by waterbird endozoochory in neotropical wetlands. BIOTA NEOTROPICA 2022. [DOI: 10.1590/1676-0611-bn-2021-1239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract Waterbird-mediated zoochory is one of the main ecological mechanisms by which non-flying freshwater invertebrates can disperse between isolated wetlands. Passive dispersal through gut passage inside waterbirds (endozoochory) may explain how many organisms spread in the landscape. Here, we evaluate the potential for dispersal of aquatic snails by three waterbird species in neotropical wetlands. A total of 77 faecal samples from Coscoroba coscoroba (n = 28), Dendrocygna viduata (n = 36) and Anas flavirostris (n = 13) were collected in the field and taken to the laboratory. There, the samples were examined under a stereomicroscope to check for the presence of gastropod shells. We found 496 intact gastropod shells, and Heleobia piscium was the most abundant species (n= 485). We also found two shells of Drepanotrema sp. and nine others distributed between two different morphotypes of Planorbidae. Snails were present in 20.8 % of all samples, and were more frequent in faeces of coscoroba swan (50%) than the other two bird species. Our data suggest that aquatic snails may disperse by avian endozoochory between neotropical wetlands, with vectors including migratory bird species.
Collapse
Affiliation(s)
| | | | | | - Leonardo Maltchik
- Universidade Federal do Rio Grande, Brasil; Universidade Federal de São Carlos, Brasil
| | | |
Collapse
|
7
|
Edwards CR, Thiels SE, Sullivan KT, Guajardo J, Littrell BM, Bonner TH. Occurrence of Golden Topminnow, Fundulus chrysotus, in the San Marcos River, Texas. SOUTHEAST NAT 2021. [DOI: 10.1656/058.020.0309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
8
|
Santangelo JM, Vanschoenwinkel B, Trekels H. Habitat isolation and the cues of three remote predators differentially modulate prey colonization dynamics in pond landscapes. Oecologia 2021; 196:1027-1038. [PMID: 34327568 DOI: 10.1007/s00442-021-04997-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 07/21/2021] [Indexed: 10/20/2022]
Abstract
Recent evidence suggests predators may change colonization rates of prey in nearby predator-free patches as an example of context-dependent habitat selection. Such remote predator effects can be positive when colonizers are redirected to nearby patches (habitat compression), or negative when nearby patches are avoided (risk contagion). However, it is unknown to what extent such responses are predator- and prey-specific and change with increasing distance from predator patches. We evaluated how cues of fish, backswimmers and dragonfly larvae affect habitat selection in replicated pond landscapes with predator-free patches located at increasing distances from a predator patch. We found evidence for risk contagion and compression, but spatial colonization patterns were both predator- and prey-specific. The mosquito Culex pipiens and water beetle Hydraena testacea avoided patches next to patches with dragonfly larvae (i.e. risk contagion). Predator-free patches next to patches with backswimmers were avoided only by mosquitoes. Mosquitoes preferentially colonized patches at some distance from a fish or backswimmer patch (i.e. habitat compression). Colonization patterns of beetles also suggested habitat compression, although reward contagion could not be fully excluded as an alternative explanation. Water beetles preferred the most isolated patches regardless of whether predators were present in the landscape, showing that patch position in a landscape alone affects colonization. We conclude that habitat selection can be a complex product of patch isolation and the combined effects of different local and remote cues complicate current attempts to predict the distribution of mobile organisms in landscapes.
Collapse
Affiliation(s)
- Jayme M Santangelo
- Departamento de Ciências Ambientais, Universidade Federal Rural do Rio de Janeiro (UFRRJ), Rodovia BR 465, Km 07, CEP, Seropédica, RJ, 23890-000, Brasil.
| | - Bram Vanschoenwinkel
- Community Ecology Lab, Department of Biology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussels, Belgium.,Centre for Environmental Management (IB 67), University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
| | - Hendrik Trekels
- Community Ecology Lab, Department of Biology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussels, Belgium
| |
Collapse
|
9
|
Cui R, Tyers AM, Malubhoy ZJ, Wisotsky S, Valdesalici S, Henriette E, Kosakovsky Pond SL, Valenzano DR. Ancestral transoceanic colonization and recent population reduction in a nonannual killifish from the Seychelles archipelago. Mol Ecol 2021; 30:3610-3623. [PMID: 33998095 DOI: 10.1111/mec.15982] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 04/29/2021] [Accepted: 05/10/2021] [Indexed: 12/28/2022]
Abstract
Whether freshwater fish colonize remote islands following tectonic or transoceanic dispersal remains an evolutionary puzzle. Integrating dating of known tectonic events with phylogenomics and current species distribution, we find that killifish species distribution is not explained by species dispersal by tectonic drift only. Investigating the colonization of a nonannual killifish (golden panchax, Pachypanchax playfairii) on the Seychelle islands, we found genetic support for transoceanic dispersal and experimentally discovered an adaptation to complete tolerance to seawater. At the macroevolutionary scale, despite their long-lasting isolation, nonannual golden panchax show stronger genome-wide purifying selection than annual killifishes from continental Africa. However, progressive decline in effective population size over a more recent timescale has probably led to the segregation of slightly deleterious mutations across golden panchax populations, which represents a potential threat for species preservation in the long term.
Collapse
Affiliation(s)
- Rongfeng Cui
- Max Planck Institute for Biology of Ageing, Cologne, Germany.,School of Ecology, Sun Yat-sen University, Guangzhou, China
| | | | | | - Sadie Wisotsky
- Department of Biology, Institute for Genomics and Evolutionary Medicine, Temple University, Temple, CA, USA
| | | | - Elvina Henriette
- Island Biodiversity Conservation Centre, University of Seychelles, Anse Royale, Mahe, Seychelles
| | - Sergei L Kosakovsky Pond
- Department of Biology, Institute for Genomics and Evolutionary Medicine, Temple University, Temple, CA, USA
| | - Dario Riccardo Valenzano
- Max Planck Institute for Biology of Ageing, Cologne, Germany.,CECAD, University of Cologne, Cologne, Germany
| |
Collapse
|
10
|
Lin S, Li T, Liou C, Amarga AKS, Cabras A, Tseng H. Eggs survive through avian guts-A possible mechanism for transoceanic dispersal of flightless weevils. Ecol Evol 2021; 11:7132-7137. [PMID: 34188800 PMCID: PMC8216937 DOI: 10.1002/ece3.7630] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/02/2021] [Accepted: 04/09/2021] [Indexed: 11/11/2022] Open
Abstract
How flightless animals disperse to remote oceanic islands is a key unresolved question in biogeography. The flightless Pachyrhynchus weevils represent repetitive colonization history in West Pacific islands, which attracted our interests about how some weevils have successfully dispersed in the reverse direction against the sea current. Here, we propose endozoochory as a possible mechanism that the eggs of the weevils might be carried by embedded in the fruits as the food of frugivorous birds. In this study, Pachyrhynchus eggs were embedded in small pieces of persimmon fruits (Diospyros kaki) and fed to captive frugivorous birds. After digestion, 83%-100% eggs were retrieved from the feces of a bulbul (Hypsipetes leucocephalus) and two thrushes (Turdus chrysolaus). The retrieved eggs had hatching rates higher than 84%, which were not different from the control. In contrast, no egg was retrieved from the feces of the frugivorous pigeon (Treron sieboldii), which took a longer retention time in the guts. Our study identified that the eggs of Pachyrhynchus weevils are possible to be transported by internal digesting in some bird species.
Collapse
Affiliation(s)
- Si‐Min Lin
- School of Life ScienceNational Taiwan Normal UniversityTaipeiTaiwan
- Biodiversity ProgramTaiwan International Graduate ProgramAcademia SinicaTaipeiTaiwan
| | - Tsui‐Wen Li
- School of Life ScienceNational Taiwan Normal UniversityTaipeiTaiwan
| | - Chia‐Hsin Liou
- Department of BiologyNational Museum of Natural ScienceTaichungTaiwan
| | - Ace Kevin S. Amarga
- School of Life ScienceNational Taiwan Normal UniversityTaipeiTaiwan
- Biodiversity ProgramTaiwan International Graduate ProgramAcademia SinicaTaipeiTaiwan
| | - Analyn Cabras
- Coleoptera Research CenterUniversity of MindanaoDavao CityPhilippines
| | - Hui‐Yun Tseng
- Department of EntomologyNational Taiwan UniversityTaipeiTaiwan
| |
Collapse
|
11
|
Garcez DK, Fernandes MO, Ozório GR, Volcan MV, Robe LJ. Phylogenetic structure of Neotropical annual fish of the genus Cynopoecilus(Cyprinodontiformes: Rivulidae), with an assessment of taxonomic implications. J ZOOL SYST EVOL RES 2020. [DOI: 10.1111/jzs.12389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daiana Kaster Garcez
- Programa de Pós‐Graduação em Biologia de Ambientes Aquáticos Continentais Universidade Federal do Rio Grande Rio Grande Brazil
| | - Murilo Oliveira Fernandes
- Programa de Pós‐Graduação em Biologia de Ambientes Aquáticos Continentais Universidade Federal do Rio Grande Rio Grande Brazil
| | - Gabrielli Rosa Ozório
- Programa de Pós‐Graduação em Biologia de Ambientes Aquáticos Continentais Universidade Federal do Rio Grande Rio Grande Brazil
| | | | - Lizandra Jaqueline Robe
- Programa de Pós‐Graduação em Biologia de Ambientes Aquáticos Continentais Universidade Federal do Rio Grande Rio Grande Brazil
- Departamento de Ecologia e Evolução (DEE) Centro de Ciências Naturais e Exatas (CCNE) Universidade Federal de Santa Maria Santa Maria Brazil
| |
Collapse
|
12
|
van der Merwe PDW, Cotterill FPD, Kandziora M, Watters BR, Nagy B, Genade T, Flügel TJ, Svendsen DS, Bellstedt DU. Genomic fingerprints of palaeogeographic history: The tempo and mode of rift tectonics across tropical Africa has shaped the diversification of the killifish genus Nothobranchius (Teleostei: Cyprinodontiformes). Mol Phylogenet Evol 2020; 158:106988. [PMID: 33059071 DOI: 10.1016/j.ympev.2020.106988] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 09/16/2020] [Accepted: 10/07/2020] [Indexed: 01/04/2023]
Abstract
This paper reports a phylogeny of the African killifishes (Genus Nothobranchius, Order Cyprinodontiformes) informed by five genetic markers (three nuclear, two mitochondrial) of 80 taxa (seven undescribed and 73 of the 92 recognized species). These short-lived annual fishes occupy seasonally wet habitats in central and eastern Africa, and their distribution coincides largely with the East African Rift System (EARS). The fossil dates of sister clades used to constrain a chronometric tree of all sampled Nothobranchius recovered the origin of the genus at ~13.27 Mya. It was followed by the radiations of six principal clades through the Neogene. An ancestral area estimation tested competing biogeographical hypotheses to constrain the ancestral origin of the genus to the Nilo-Sudan Ecoregion, which seeded a mid-Miocene dispersal event into the Coastal ecoregion, followed closely (~10 Mya) by dispersals southward across the Mozambique coastal plain into the Limpopo Ecoregion. Extending westwards across the Tanzanian plateau, a pulse of radiations through the Pliocene were associated with dispersals and fragmentation of wetlands across the Kalahari and Uganda Ecoregions. We interpret this congruence of drainage rearrangements with dispersals and cladogenic events of Nothobranchius to reflect congruent responses to recurrent uplift and rifting. The coevolution of these freshwater fishes and wetlands is attributed to ultimate control by tectonics, as the EARS extended southwards during the Neogene. Geobiological consilience of the combined evidence supports a tectonic hypothesis for the evolution of Nothobranchius.
Collapse
Affiliation(s)
| | | | - Martha Kandziora
- Department of Botany, Faculty of Science, Charles University, Prague, Czech Republic
| | - Brian R Watters
- 6141 Parkwood Drive, Nanaimo, British Columbia V9T6A2, Canada
| | - Béla Nagy
- 30, Rue du Mont Ussy, 77300 Fontainebleau, France
| | - Tyrone Genade
- Biomedical Sciences, East Tennessee State University, USA
| | - Tyrel J Flügel
- Department of Geography and Environmental Studies, Stellenbosch University, South Africa
| | - David S Svendsen
- Department of Geography and Environmental Studies, Stellenbosch University, South Africa
| | - Dirk U Bellstedt
- Department of Biochemistry, Stellenbosch University, South Africa.
| |
Collapse
|
13
|
Experimental evidence of dispersal of invasive cyprinid eggs inside migratory waterfowl. Proc Natl Acad Sci U S A 2020; 117:15397-15399. [PMID: 32571940 PMCID: PMC7355035 DOI: 10.1073/pnas.2004805117] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Fish have somehow colonized isolated water bodies all over the world without human assistance. It has long been speculated that these colonization events are assisted by waterbirds, transporting fish eggs attached to their feet and feathers, yet empirical support for this is lacking. Recently, it was suggested that endozoochory (i.e., internal transport within the gut) might play a more important role, but only highly resistant diapause eggs of killifish have been found to survive passage through waterbird guts. Here, we performed a controlled feeding experiment, where developing eggs of two cosmopolitan, invasive cyprinids (common carp, Prussian carp) were fed to captive mallards. Live embryos of both species were retrieved from fresh feces and survived beyond hatching. Our study identifies an overlooked dispersal mechanism in fish, providing evidence for bird-mediated dispersal ability of soft-membraned eggs undergoing active development. Only 0.2% of ingested eggs survived gut passage, yet, given the abundance, diet, and movements of ducks in nature, our results have major implications for biodiversity conservation and invasion dynamics in freshwater ecosystems.
Collapse
|
14
|
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]
|