Environmental, seasonal, and social modulations of basal activity in a weakly electric fish

Silva, Ana C.; Perrone, Rossana; Macadar, O.

doi:10.1016/j.physbeh.2006.11.003

Cited by 70 publications

(93 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reproductive biology and life history: Detailed accounts of the reproductive ecology and life history of Brachyhypopomus are available for B. occidentalis from Panama (Hagedorn, 1986;, and for three species from southern subtropical systems: B. bombilla , B. draco (Schaan et al, 2009), and B. gauderio (Giora et al, 2014;Miranda et al, 2008;Quintana et al, 2004;Silva et al, 2007;Silva et al, 2002; (and see species descriptions herein). The reproductive ecology of Amazon and Orinoco species is largely undocumented, although Alves-Gomes (1997) noted spawning preceding seasonal flooding in the rio Branco system of Roraima, Brazil, and Crampton (1996a) observed spawning coincident with the rising-water period and high water period in species from Amazonian floodplains.…”

Section: Functional Biology and Ecology Specializations Associated Wmentioning

confidence: 99%

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species

et al. 2016

View full text Add to dashboard Cite

The bluntnose knifefish genus Brachyhypopomus Mago-Leccia, 1994, is diagnosed from other Rhamphichthyoidea (Rhamphichthyidae + Hypopomidae) by the presence of a disk-like ossification in the anterior portion of the palatoquadrate, and by the following external characters: short snout, 18.7-32.6% of head length Gymnorhamphichthys, Iracema, and Rhamphichthys), absence of a paired accessory electric organ in the mental or humeral region (vs. presence in Hypopygus and Steatogenys), presence of 3-4 pectoral proximal radials (vs. 5 in Akawaio), presence of the antorbital + infraorbital, and the preopercular cephalic lateral line canal bones (vs. absence in Racenisia). Brachyhypopomus cannot be diagnosed unambiguously from Microsternarchus or from Procerusternarchus on the basis of external characters alone. Brachyhypopomus comprises 28 species. Here we describe 15 new species, and provide redescriptions of all 13 previously described species, based on meristic, morphometric, and other morphological characters. We include notes on ecology and natural history for each species, and provide regional dichotomous keys and distribution maps, based on the examination of 12,279 specimens from 2,787 museum lots. A lectotype is designated for Brachyhypopomus pinnicaudatus (Hopkins, Comfort, Bastian & Bass, 1990 Peixes elétricos do gênero Brachyhypopomus Mago-Leccia, 1994, são diagnosticados dos outros Rhamphichthyoidea (Rhamphichthyidae + Hypopomidae) pela presença de uma ossificação discóide na porção anterior do palatoquadrado, e pelos seguintes caracteres externos: focinho curto, 18,7-32,6% do comprimento da cabeça (vs. 33,3-68,6% em Hypopomus, Gymnorhamphichthys, Iracema e Rhamphichthys), ausência de um órgão elétrico acessório pareado na região mental ou humeral (vs. presença em Hypopygus e Steatogenys), presença de 3-4 proximais peitorais radiais (vs. 5 em Akawaio), presença do antiorbital + infraorbital, e dos canais ossificados da linha lateral da região cefálica do pré-opérculo (vs. ausência em Racenisia). Brachyhypopomus não pode ser diagnosticado de maneira não-ambígua de Microsternarchus ou Procerusternarchus, com base em caracteres de morfologia externa. Brachyhypopomus compreende 28 espécies válidas. Aqui nós descrevemos 15 espécies novas, e fornecemos a redescrição de 13 espécies previamente descritas, baseado em caracteres merísticos, morfométricos e outros caracteres morfológicos. Nós incluímos notas sobre à ecologia e história natural para cada uma das espécies, e fornecemos chaves dicotômicas regionais e mapas de distribuição baseado no exame de 12.279 espécimes de 2.787 lotes de museus. Um lectótipo é designado para Brachyhypopomus pinnicaudatus (Hopkins, Comfort, Bastian & Bass, 1990

show abstract

Section: Functional Biology and Ecology Specializations Associated Wmentioning

confidence: 99%

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Brachyhypopomus gauderio enhances its EOD following a circadian rhythm: they reduce rate, amplitude and duration of the electric organ discharge during the day and increase them during the night when the fish are more active Silva et al, 2007;. Both, males and females follow this circadian pattern but it is enhanced in males (Fig.…”

Section: Cost Savings and Life-historymentioning

confidence: 90%

“…Some electric fish modulate their discharge rates, increasing the rates during courtship or agonistic interactions, and between daytime rest and nighttime activity Zakon et al, 1991;Hagedorn, 1995;Dunlap, 2002;Silva et al, 2007). Brachyhypopomus gauderio enhances its EOD following a circadian rhythm: they reduce rate, amplitude and duration of the electric organ discharge during the day and increase them during the night when the fish are more active Silva et al, 2007;.…”

Section: Cost Savings and Life-historymentioning

confidence: 99%

“…EOD amplitude and duration display short-term changes, both increasing during social interaction Silva et al 2007) and in anticipation of night, when fish become active ). These short-term signal increases are mediated by melanocortin peptide hormones such as ACTH and α-MSH Markham et al 2009a).…”

Section: Introductionmentioning

confidence: 99%

“…Male B. gauderio produce EODs of higher magnitude, longer duration and greater energetic cost than females or subadults . At night and especially when challenged by a conspecific male, males increase EOD amplitude and duration of the second phase Silva et al, 2007) resulting in a further increase on the energetic expense of signaling . Social competition increases androgen and cortisol levels along with signal enhancement ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Social and Environmental Regulation of Signal Plasticity and Signal Reliability in the Electric Fish Brachyhypopomus gauderio

Becerra¹

View full text Add to dashboard Cite

Expression of the cannabinoid CB1 receptor in the gymnotiform fish brain and its implications for the organization of the teleost pallium

Harvey‐Girard

Giassi

Ellis

et al. 2013

J of Comparative Neurology

View full text Add to dashboard Cite

Cannabinoid CB1 receptors (CB1R) are widely distributed in the brains of many vertebrates, but whether their functions are conserved is unknown. The weakly electric fish, Apteronotus leptorhynchus (Apt), has been well studied for its brain structure, behavior, sensory processing, and learning and memory. It therefore offers an attractive model for comparative studies of CB1R functions. We sequenced partial AptCB1R mRNAs and performed in situ hybridization to localize its expression. Partial AptCB1R protein sequence was highly conserved to zebrafish (90.7%) and mouse (81.9%) orthologs. AptCB1R mRNA was highly expressed in the telencephalon. Subpallial neurons (dorsal, central, intermediate regions and part of the ventral region, Vd/Vc/Vi, and Vv) expressed high levels of AptCB1R transcript. The central region of dorsocentral telencephalon (DC(core) ) strongly expressed CB1R mRNA; cells in DC(core) project to midbrain regions involved in electrosensory/visual function. The lateral and rostral regions of DC surrounding DC(core) (DC(shell) ) lack AptCB1R mRNA. The rostral division of the dorsomedial telencephalon (DM1) highly expresses AptCB1R mRNA. In dorsolateral division (DL) AptCB1R mRNA was expressed in a gradient that declined in a rostrocaudal manner. In diencephalon, AptCB1R RNA probe weakly stained the central-posterior (CP) and prepacemaker (PPn) nuclei. In mesencephalon, AptCB1R mRNA is expressed in deep layers of the dorsal (electrosensory) torus semicircularis (TSd). In hindbrain, AptCB1R RNA probe weakly labeled inhibitory interneurons in the electrosensory lateral line lobe (ELL). Unlike mammals, only few cerebellar granule cells expressed AptCB1R transcripts and these were located in the center of eminentia granularis pars posterior (EGp), a cerebellar region involved in feedback to ELL.

show abstract

Environmental, seasonal, and social modulations of basal activity in a weakly electric fish

Cited by 70 publications

References 63 publications

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species

Social and Environmental Regulation of Signal Plasticity and Signal Reliability in the Electric Fish Brachyhypopomus gauderio

Expression of the cannabinoid CB1 receptor in the gymnotiform fish brain and its implications for the organization of the teleost pallium

Contact Info

Product

Resources

About