An Ecological Perspective on Diversity and Distributions

Crampton, William G. R.

doi:10.1525/california/9780520268685.003.0010

Cited by 81 publications

(107 citation statements)

References 0 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…In some clades of deep-channel apteronotids, several closely-related species occur together in sympatry and syntopy, such as in Adontosternarchus, Porotergus, Sternarchella, Sternarchogiton, and Sternarchorhynchus Crampton et al, 2011). Other gymnotiform clades are also diverse in the deep-channel habitat, including the sternopygids Eigenmannia and Rhabdolichops, and the rhamphichthyid Rhamphichthys (Albert et al, 2011b;Carvalho, 2013).…”

Section: Origin Of the Deep-channel Electric Fish Faunamentioning

confidence: 99%

“…In fact, the watershed divide between these basins may more profitably be viewed as a semipermeable dispersal filter rather than as an impermeable dispersal barrier for lowland riverine species (Lovejoy et al, 2010). The complete absence of S. sima from the Western Amazon (Gálvis et al, 2006;Crampton, 2011;Ortega et al, 2011;Albert et al, 2012), and the presence of this species in the Negro and upper Orinoco (Winemiller & Willis, 2011), is consistent with the less ancient dispersal scenario, rather than the more ancient vicariance scenario.…”

Section: Paleogeography and The Origin Of Species In The Sternarchellinimentioning

confidence: 99%

“…Sternarchella is known from six valid species: S. calhamazon (Lundberg et al, 2013), S. orinoco (Mago-Leccia, 1994), S. orthos (Mago-Leccia, 1994), S. schotti (Steindachner, 1868), S. sima (Starks, 1913), S. terminalis (Eigenmann & Allen, 1942), and one undescribed species (Sternarchella sp. A, Crampton, 2011). Most species of Sternarchella (except S. schotti and Sternarchella sp.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Systematics and biogeography of Sternarchellini (Gymnotiformes: Apteronotidae): Diversification of electric fishes in large Amazonian rivers

Ivanyisky¹,

Albert²

2014

Neotrop. ichthyol.

View full text Add to dashboard Cite

The Sternarchellini (Gymnotiformes, Apteronotidae) is a clade of 10 electric fish species that inhabit deep river channels of the Amazon and Orinoco basins, attain moderate adult body sizes (15-50 cm TL), and have a predatory life style. Here we trace the evolutionary origin and diversification of Sternarchellini using standard phylogenetic and biogeographic procedures and a dataset of 70 morphological characters. The main results are: 1) the genus Sternarchella includes both species currently assigned to the genus Magosternarchus; and 2) neither of the multi-species assemblages of Sternarchellini in the Amazon and Orinoco basins are monophyletic. Historical biogeographic analysis suggests that sternarchelline evolution was linked to the large-scale river capture event that formed the modern Amazon and Orinoco basins, i.e. the Late Miocene rise of the Vaupes structural arch and concomitant breaching of the Purus structural arch. This event is hypothesized to have contributed to formation of the modern sternarchelline species, and to the formation of the modern basin-wide sternarchelline species assemblages. The results indicate that cladogenesis (speciation) and anagenesis (adaptive evolution) were decoupled processes in the evolution of Sternarchellini.Sternarchellini (Gymnotiformes, Apteronotidae) é um clado de 10 espécies de peixes elétricos que habitam canais profundos de rios das bacias do Amazonas e Orinoco, que atingem um tamanho moderado quando adultos (15-50 cm CT), e possuem hábito predatório. Rastreamos a origem evolutiva e diversificação de Sternarchellini utilizando técnicas filogenéticas e biogeográficas padrões e um conjunto de dados de 70 caracteres morfológicos. Os principais resultados são: 1) o gênero Sternarchella inclui duas espécies atualmente atribuídas ao gênero Magosternarchus; e 2) as assembleias de multi-espécies de Sternarchellini nas bacias Amazônica e do Orinoco não formam grupos monofiléticos. A análise biogeográfica histórica sugere que a evolução do Sternarchellini esteve ligada ao evento de captura de rio de grande escala que formou as atuais bacias do Amazonas e Orinoco, i.e., o soerguimento do arco estrutural Vaupés no Mioceno Superior e o rompimento concomitante do arco estrutural Purus. É proposto que esse evento contribuiu para o surgimento das espécies atuais de Sternarchellini, e para a formação das assembleias modernas de espécies de Sternarchellini com ampla distribuição nas bacias. Os resultados indicam que cladogênese (especiação) e anagenêse (evolução adaptativa) foram processos desacoplados na evolução de Sternarchellini.

show abstract

Section: Origin Of the Deep-channel Electric Fish Faunamentioning

confidence: 99%

Section: Paleogeography and The Origin Of Species In The Sternarchellinimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Systematics and biogeography of Sternarchellini (Gymnotiformes: Apteronotidae): Diversification of electric fishes in large Amazonian rivers

Ivanyisky¹,

Albert²

2014

Neotrop. ichthyol.

View full text Add to dashboard Cite

show abstract

“…Thus, we believe that a strong habitat template is most likely the major cause for the high phylogenetic signal in the ecomorphological structure of the Paraguai and São Francisco River assemblages. Lineages included in this study are typically restricted to small and upland streams, environments with characteristics such as strong current, well-oxygenated water, pH close to neutral, relatively coarse substrates, and low-diversity fish communities with specializations for rapid flow such as dorsoventral flattening (Crampton, 2011), structures to attach to the bottom, and a good capacity for continuous swimming.…”

Section: Discussionmentioning

confidence: 99%

“…For some Neotropical fish clades there is evidence for a pattern of niche conservatism. For example, the Piaractus, Colossoma and Mylossoma (Serrasalmidae) genera are all highly specialized frugivores that occur in floodplain forests and make upriver migrations (Crampton, 2011). The existence of Miocene fossils of Colossoma demonstrates that this clade has been associated with floodplains for a long period of time, because there are no derived transitions to other habitats in this clade (Lundberg et al, 1988;Crampton, 2011), remained morphologically conservative for at least 15 million years (Lundberg et al, 1988).…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic signal and major ecological shifts in the ecomorphological structure of stream fish in two river basins in Brazil

2015

View full text Add to dashboard Cite

We tested the contribution of the phylogenetic and specific components to the ecomorphological structure of stream fish from the upper Paraguai River and upper São Francisco River basins, and identified nodes in the phylogenetic tree at which major ecological shifts occurred. Fish were sampled between June and October of 2008 in 12 streams (six in each basin). In total, 22 species from the upper Paraguai River basin and 12 from the upper São Francisco River were analyzed. The ecomorphological patterns exhibited phylogenetic signal, indicating that the ecomorphological similarity among species is associated with the degree of relatedness. A strong habitat template is most likely to be the primary cause for a high phylogenetic signal. A significant contribution from the specific component was also detected, supporting the idea that the phylogenetic signal occurs in some clades for some traits, but not in others. The major ecological shifts were observed in the basal nodes, suggesting that ecological niche differences appear to accumulate early in the evolutionary history of major clades. This finding reinforces the role of key traits in the diversification of Neotropical fishes. Ecological shifts in recent groups could be related to morphological modifications associated with habitat use.Examinamos a contribuição dos componentes filogenético e específico para a estrutura ecomorfológica de peixes de riacho das bacias do alto rio Paraguai e do alto rio São Francisco, e identificamos os nós na árvore filogenética onde ocorreram as maiores mudanças ecológicas. Os peixes foram amostrados entre junho e outubro de 2008 em 12 riachos (seis em cada bacia). No total, 22 espécies do alto rio Paraguai foram analisadas e 12 do alto rio São Francisco. O padrão ecomorfológico exibiu sinal filogenético, indicando que a similaridade ecomorfológica entre as espécies está associada com o grau de parentesco. Um forte 'habitat template' é provavelmente a maior causa para o forte sinal filogenético. Foi detectada uma significativa contribuição do componente específico, apoiando a ideia de que o sinal filogenético ocorre em alguns clados para alguns traços, mas não em outros. As maiores mudanças ecológicas foram observadas nos nós basais sugerindo que as diferenças do nicho ecológico em peixes de riacho parecem acumular-se cedo na história evolutiva dos clados e reforça o papel de traços fundamentais na diversificação de peixes Neotropicais. Mudanças ecológicas em grupos recentes podem estar relacionadas com uma modificação morfológica associada ao uso do habitat. Keywords IntroductionPhenotypic traits provide useful information about the relationship between an organism and its environment (Ricklefs & Miles, 1994). Ecomorphology involves the adaptive nature of a phenotype, in the sense that particular phenotypes maximize fitness in particular environments (Ricklefs & Miles, 1994). Because morphology integrates ecological relationships over large temporal and spatial scales, ecomorphology assumes that such generalized patterns of corre...

show abstract

Hormone‐mediated modulation of the electromotor CPG in pulse‐type weakly electric fish. Commonalities and differences across species

Borde

Quintana

Comas

et al. 2020

Developmental Neurobiology

View full text Add to dashboard Cite

Like stomatogastric activity in crustaceans, vocalization in teleosts and frogs, and locomotion in mammals, the electric organ discharge (EOD) of weakly electric fish is a rhythmic and stereotyped electromotor pattern. The EOD, which functions in both perception and communication, is controlled by a two‐layered central pattern generator (CPG), the electromotor CPG, which modifies its basal output in response to environmental and social challenges. Despite major anatomo‐functional commonalities in the electromotor CPG across electric fish species, we show that Gymnotus omarorum and Brachyhypopomus gauderio have evolved divergent neural processes to transiently modify the CPG outputs through descending fast neurotransmitter inputs to generate communication signals. We also present two examples of electric behavioral displays in which it is possible to separately analyze the effects of neuropeptides (mid‐term modulation) and gonadal steroid hormones (long‐term modulation) upon the CPG. First, the nonbreeding territorial aggression of G. omarorum has been an advantageous model to analyze the status‐dependent modulation of the excitability of CPG neuronal components by vasotocin. Second, the seasonal and sexually dimorphic courtship signals of B. gauderio have been useful to understand the effects of sex steroids on the responses to glutamatergic inputs in the CPG. Overall, the electromotor CPG functions in a regime that safeguards the EOD waveform. However, prepacemaker influences and hormonal modulation enable an enormous versatility and allows the EOD to adapt its functional state in a species‐, sex‐, and social context‐specific manners.

show abstract

An Ecological Perspective on Diversity and Distributions

Cited by 81 publications

References 0 publications

Systematics and biogeography of Sternarchellini (Gymnotiformes: Apteronotidae): Diversification of electric fishes in large Amazonian rivers

Systematics and biogeography of Sternarchellini (Gymnotiformes: Apteronotidae): Diversification of electric fishes in large Amazonian rivers

Phylogenetic signal and major ecological shifts in the ecomorphological structure of stream fish in two river basins in Brazil

Hormone‐mediated modulation of the electromotor CPG in pulse‐type weakly electric fish. Commonalities and differences across species

Contact Info

Product

Resources

About