1
|
Soares Guedes GH, Gomes ID, Alves do Nascimento A, Silva de Aguiar F, Araújo FG. Equilibrium reproductive strategy of the peacock bass Cichla kelberi facilitates invasion into a Neotropical reservoir. J Fish Biol 2021; 98:743-755. [PMID: 33206375 DOI: 10.1111/jfb.14618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 11/01/2020] [Accepted: 11/16/2020] [Indexed: 06/11/2023]
Abstract
The reproductive strategy of the non-native predator cichlid Cichla kelberi was determined to explain its success after more than 60 years of being introduced into an isolated reservoir in southeastern Brazil. This was one of the first-known translocations of the genus Cichla out of its natural range. Macro- and microscopy characteristics of the gonadal development stages and the maturation phases, along with the reproductive features (size at first maturation size, gonado-somatic index and sex ratio), were described. It was hypothesized that the stable conditions of the reservoir, with low connectivity, weakly defined spatial gradient and slight seasonal changes in environmental variables, favour the equilibrium strategy that enables predators to have high offspring survivorship because of great parental investment in individual progeny. Sex ratio was well balanced, with males and females reaching first maturity between 30.0 and 28.6 cm total length (LT ), respectively. The stages of oocyte (primary and secondary growth, vitellogenic and atresia) and spermatocyte (spermatogonia, spermatocytes, spermatids and spermatozoa) development were identified. Five phases of gonadal development (immature, developing, spawning capable, regressing and regenerating) were described for both sexes. A long reproductive season was found, with spawning peaks in August/September and, to a lesser extent, in April/May. Parental care and spawns in parcels (batch spawns) corroborated the raised equilibrium strategy that was effective in this isolated reservoir. This species developed reproductive mechanisms that fit to different environmental conditions, with multiple spawning being associated with lentic environments and asynchronous development of oocytes, which are released over long periods. The reproductive plasticity in reservoirs may be one of the main factors inherent to the successful of colonization and establishment of the peacock bass in the environments in which they were introduced.
Collapse
Affiliation(s)
- Gustavo Henrique Soares Guedes
- Departamento de Biologia Animal, Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil
| | - Iracema David Gomes
- Departamento de Biologia Animal, Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil
| | - Aparecida Alves do Nascimento
- Departamento de Biologia Animal, Laboratório de Histologia e Embriologia Animal, Universidade Federal Rural do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fernanda Silva de Aguiar
- Departamento de Biologia Animal, Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil
| | - Francisco Gerson Araújo
- Departamento de Biologia Animal, Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil
| |
Collapse
|
2
|
de Sousa Gomes-Gonçalves R, Silva de Aguiar F, Costa de Azevedo MC, Araújo FG. Functional stability despite anthropogenic influences on the ichthyofauna of a tropical bay. Mar Environ Res 2020; 159:105016. [PMID: 32662443 DOI: 10.1016/j.marenvres.2020.105016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/04/2020] [Accepted: 05/10/2020] [Indexed: 06/11/2023]
Abstract
Classifying species into groups based on taxonomic relationship and functions are objective approaches to evaluate environmental and anthropogenic influences on coastal fishes. We evaluated temporal (1993-1995 and 2012-2015) changes in the taxonomic and functional indices in three zones of a tropical bay heavily impacted over the recent decades. We tested the hypothesis that both indices decrease over time as result of the environmental degradation. A decrease in the taxonomic richness and abundance was observed mainly of the inner zone. The functional structure remained relatively stable, but the functional originality decreased significantly between the two periods. This functional loss is of particular concern because the loss of species with unique treats may generate a series of ecosystem damage. This information tells us that the use of functional indices is essential to complement taxonomic assessments and to detect a more detailed understanding of the real dimension of biodiversity loss in impacted environments.
Collapse
Affiliation(s)
- Rafaela de Sousa Gomes-Gonçalves
- Universidade Federal Rural Do Rio de Janeiro, Laboratório de Ecologia de Peixes, BR 465, Km 7, 23970-030, Seropédica, Rio de Janeiro, Brazil
| | - Fernanda Silva de Aguiar
- Universidade Federal Rural Do Rio de Janeiro, Laboratório de Ecologia de Peixes, BR 465, Km 7, 23970-030, Seropédica, Rio de Janeiro, Brazil
| | - Marcia Cristina Costa de Azevedo
- Universidade Federal Rural Do Rio de Janeiro, Laboratório de Ecologia de Peixes, BR 465, Km 7, 23970-030, Seropédica, Rio de Janeiro, Brazil
| | - Francisco Gerson Araújo
- Universidade Federal Rural Do Rio de Janeiro, Laboratório de Ecologia de Peixes, BR 465, Km 7, 23970-030, Seropédica, Rio de Janeiro, Brazil.
| |
Collapse
|
3
|
Holandino C, Teixeira CAA, de Oliveira FAG, Barbosa GM, Siqueira CM, Messeder DJ, de Aguiar FS, da Veiga VF, Girard-Dias W, Miranda K, Galina A, Capella MAM, Morales MM. Direct electric current treatment modifies mitochondrial function and lipid body content in the A549 cancer cell line. Bioelectrochemistry 2016; 111:83-92. [PMID: 27243447 DOI: 10.1016/j.bioelechem.2016.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/09/2016] [Accepted: 05/09/2016] [Indexed: 02/04/2023]
Abstract
Electrochemical therapy (EChT) entails treatment of solid tumors with direct electric current (DC). This work evaluated the specific effects of anodic flow generated by DC on biochemical and metabolic features of the A549 human lung cancer cell line. Apoptosis was evaluated on the basis of caspase-3 activity and mitochondrial transmembrane potential dissipation. Cell morphology was analyzed using transmission electron microscopy, and lipid droplets were studied through morphometric analysis and X-ray qualitative elemental microanalysis. High-resolution respirometry was used to assess mitochondrial respiratory parameters. Results indicated A549 viability decreased in a dose-dependent manner with a prominent drop between 18 and 24h after treatment (p<0.001), together with a two-fold increase in caspase-3 activity. AF-treatment induced a significantly increase (p<0.01) in the cell number with disrupted mitochondrial transmembrane potential. Furthermore, treated cells demonstrated important ultrastructural mitochondria damage and a three-fold increase in the cytoplasmic lipid bodies' number, quantified by morphometrical analyses. Conversely, 24h after treatment, the cells presented a two-fold increase of residual oxygen consumption, accounting for 45.3% of basal oxygen consumption. These results show remarkable alterations promoted by anodic flow on human lung cancer cells which are possibly involved with the antitumoral effects of EChT.
Collapse
Affiliation(s)
- Carla Holandino
- Laboratory of Multidisciplinary Pharmaceutical Sciences, College of Pharmacy, Center of Health Sciences (CCS), Federal University do Rio de Janeiro, Rio de Janeiro, Brazil.
| | - Cesar Augusto Antunes Teixeira
- Laboratory of Multidisciplinary Pharmaceutical Sciences, College of Pharmacy, Center of Health Sciences (CCS), Federal University do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Felipe Alves Gomes de Oliveira
- Laboratory of Multidisciplinary Pharmaceutical Sciences, College of Pharmacy, Center of Health Sciences (CCS), Federal University do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gleyce Moreno Barbosa
- Laboratory of Multidisciplinary Pharmaceutical Sciences, College of Pharmacy, Center of Health Sciences (CCS), Federal University do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Camila Monteiro Siqueira
- Federal Institute of Education, Science and Technology of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Douglas Jardim Messeder
- Laboratory of Bioenergetics and Mitochondrial Physiology, Institute of Medical Biochemistry, CCS, Federal University do Rio de Janeiro, Brazil
| | - Fernanda Silva de Aguiar
- Laboratory of Multidisciplinary Pharmaceutical Sciences, College of Pharmacy, Center of Health Sciences (CCS), Federal University do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Venicio Feo da Veiga
- Laboratory of Electron Microscopy, Institute of Microbiology Prof. Paulo de Góes (IMPPG), CCS, UFRJ, Rio de Janeiro, Brazil
| | - Wendell Girard-Dias
- Laboratory of Cellular Ultrastructure Hertha Meyer, Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Kildare Miranda
- Laboratory of Cellular Ultrastructure Hertha Meyer, Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Antonio Galina
- Laboratory of Bioenergetics and Mitochondrial Physiology, Institute of Medical Biochemistry, CCS, Federal University do Rio de Janeiro, Brazil
| | | | - Marcelo Marcos Morales
- Laboratory of Molecular and Cellular Physiology, Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| |
Collapse
|