Plasticity of Jaw and Skull Morphology in the Neotropical Cichlids Geophagus brasiliensis and G. steindachneri

Evolution ◽  
1991 ◽  
Vol 45 (7) ◽  
pp. 1545 ◽  
Author(s):  
Peter H. Wimberger
Keyword(s):  
Skull Morphology ◽  
Geophagus Brasiliensis ◽  
Neotropical Cichlids

scholarly journals Biliary and hepatic metallothionein, metals and trace elements in environmentally exposed neotropical cichlids Geophagus brasiliensis

2018 ◽  
Vol 50 ◽  
pp. 347-355 ◽  
Author(s):  
Sylvia N. Land ◽  
Rafael Christian C. Rocha ◽  
Isabella C. Bordon ◽  
Tatiana D. Saint’Pierre ◽  
Roberta L. Ziolli ◽  
...  
Keyword(s):  
Trace Elements ◽  
Geophagus Brasiliensis ◽  
Hepatic Metallothionein ◽  
Neotropical Cichlids ◽  
Metals And Trace Elements

scholarly journals The isotopic niche of Atlantic, biting marine mammals and its relationship to skull morphology and body size

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Massimiliano Drago ◽  
Marco Signaroli ◽  
Meica Valdivia ◽  
Enrique M. González ◽  
Asunción Borrell ◽  
...  
Keyword(s):  
Body Size ◽  
Atlantic Ocean ◽  
Fisheries Management ◽  
Marine Mammals ◽  
Trophic Position ◽  
Sympatric Species ◽  
Isotopic Niche ◽  
Apex Predators ◽  
Skull Morphology ◽  
Ecosystem Based Fisheries Management

AbstractUnderstanding the trophic niches of marine apex predators is necessary to understand interactions between species and to achieve sustainable, ecosystem-based fisheries management. Here, we review the stable carbon and nitrogen isotope ratios for biting marine mammals inhabiting the Atlantic Ocean to test the hypothesis that the relative position of each species within the isospace is rather invariant and that common and predictable patterns of resource partitioning exists because of constrains imposed by body size and skull morphology. Furthermore, we analyze in detail two species-rich communities to test the hypotheses that marine mammals are gape limited and that trophic position increases with gape size. The isotopic niches of species were highly consistent across regions and the topology of the community within the isospace was well conserved across the Atlantic Ocean. Furthermore, pinnipeds exhibited a much lower diversity of isotopic niches than odontocetes. Results also revealed body size as a poor predictor of the isotopic niche, a modest role of skull morphology in determining it, no evidence of gape limitation and little overlap in the isotopic niche of sympatric species. The overall evidence suggests limited trophic flexibility for most species and low ecological redundancy, which should be considered for ecosystem-based fisheries management.

Chronic genetic damages in Geophagus brasiliensis exposed to anthropic impact in Estuarine Lakes at Santa Catarina Coast–Southern of Brazil

2011 ◽  
Vol 184 (4) ◽  
pp. 2045-2056 ◽  
Author(s):  
Cristiane Benincá ◽  
Wanessa Ramsdorf ◽  
Taynah Vicari ◽  
Ciro A. de Oliveira Ribeiro ◽  
Marina I. de Almeida ◽  
...  
Keyword(s):  
Santa Catarina ◽  
Anthropic Impact ◽  
Geophagus Brasiliensis

scholarly journals Environmental enrichment reduces aggression of pearl cichlid, Geophagus brasiliensis, during resident-intruder interactions

2010 ◽  
Vol 8 (2) ◽  
pp. 329-332 ◽  
Author(s):  
Vivian Oliveira Kadry ◽  
Rodrigo Egydio Barreto
Keyword(s):  
Habitat Complexity ◽  
Environmental Enrichment ◽  
Geophagus Brasiliensis ◽  
Prior Residence ◽  
Enriched Environments ◽  
Enrichment Condition ◽  
Resident Intruder

Among fishes, when residents and intruders fight, residents usually win, most likely because they value the residence more than intruders. We hypothesized that enriched environments increase the value of an area in dispute, causing a resident to more fiercely defend a resource-rich environment than a poor one. However, in the present study, intruder-resident tests with the pearl cichlid, Geophagus brasiliensis, showed environmental enrichment actually reduces aggression and can even lead to co-habitation without fighting. Additionally, in our experiments, the prior residence effect occurred irrespective of enrichment condition. Decreased visibility from increased habitat complexity reduces interactions between fish and consequently might explain the lower aggression observed herein.

All-Trans Retinoic Acid-Induced Craniofacial Malformation Model: A Prenatal and Postnatal Morphological Analysis

2017 ◽  
Vol 54 (4) ◽  
pp. 391-399 ◽  
Author(s):  
Weicai Wang ◽  
Yutao Jian ◽  
Bin Cai ◽  
Miao Wang ◽  
Mu Chen ◽  
...  
Keyword(s):  
Retinoic Acid ◽  
Morphological Analysis ◽  
Bone Development ◽  
Skull Morphology ◽  
Craniofacial Malformations ◽  
Mandibular Incisor ◽  
Craniofacial Bone ◽  
Trans Retinoic Acid ◽  
All Trans Retinoic Acid ◽  
Age Dependent

Objective To characterize the prenatal and postnatal craniofacial bone development in mouse model of all-trans retinoic acid (ATRA) exposure at different ages by a quantitative and morphological analysis of skull morphology. Methods Pregnant mice were exposed to ATRA at embryonic day 10 (E10) and 13 (E13) by oral gavage. Skulls of mice embryos at E19.5 and adult mice at postnatal day 35 (P35) were collected for high-resolution microcomputed tomography (microCT) imaging scanning and section HE staining. Reconstruction and measurement of mouse skulls were performed for prenatal and postnatal analysis of the control and ATRA-exposed mice. Results Craniofacial malformations in mouse models caused by ATRA exposure were age dependent. ATRA exposure at E10 induced cleft palate in 81.8% of the fetuses, whereas the palatine bone of E13-exposed mice was intact. Inhibitions of maxilla and mandible development with craniofacial asymmetry induced were observed at E19.5 and P35. Compared with control and E13-exposed mice, the palatine bones of E10-exposed mice were not elevated and were smaller in dimension. Some E10-exposed mice exhibited other craniofacial abnormalities, including premature fusion of mandibular symphysis with a missing mandibular incisor and a smaller mandible. Severe deviated snouts and amorphous craniofacial suture were detected in E13-exposed mice at P35. Conclusion These morphological variations in E10- and E13-exposed mice suggested that ATRA was teratogenic in craniofacial bone development in mice and the effect was age dependent.

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