Seasonal flooding regime and ecological traits influence genetic structure of two small rodents

Rocha, Rita Gomes; Ferreira, Eduardo; Fonseca, Carlos; Justino, Juliana; Leite, Yuri Luiz Reis; Costa, Leonora Pires

doi:10.1002/ece3.1336

Cited by 21 publications

(24 citation statements)

References 41 publications

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“…Recently, the biodiversity of Amazonian river islands has received increasing attention (Choueri et al, 2017;Cintra et al, 2007;Nunes, de Carvalho, Vaz-de-Mello, Dáttilo & Izzo, 2014;Rabelo, Aragón, Bicca-Marques & Nelson, 2019;Rabelo, Bicca-Marques, Aragón & Nelson, 2017;Rocha et al, 2014). This is a welcome development, since biodiversity studies of fluvial islands have important conservation implications.…”

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confidence: 99%

Bird assemblages on Amazonian river islands: Patterns of species diversity and composition

Borges

Baccaro

Moreira³

et al. 2019

Biotropica

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The principles of island biogeography are rarely applied to the animal assemblages of Amazonian river islands. Here, we compare bird assemblages of Amazonian river islands with a variety of mainland habitats. We also examine how bird species diversity and composition are related to island physical attributes. Birds were sampled with mist nets and qualitative censuses on 11 river islands and 24 mainland sites on the lower reaches of the Rio Negro in the Brazilian Amazon. Island bird assemblages were characterized by lower species richness and a higher abundance of a few dominant species. Additionally, the species composition of the islands was distinct from that of the mainland, including the nearby floodplain habitats. The number of bird species increased with island size and habitat diversity, and decreased with degree of isolation. In addition, small islands tended to harbor an impoverished subset of the species present on larger ones. Bird species diversity and composition on Amazonian river islands are likely influenced by the ecological succession and historical events affecting island formation. Considering their small total area across the Amazon basin, these insular fluvial communities could be disproportionately threatened by river channel disturbances related to climate change or hydroelectric dam development. Abstract in Portughese is available with online material.

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confidence: 99%

Bird assemblages on Amazonian river islands: Patterns of species diversity and composition

Borges

Baccaro

Moreira³

et al. 2019

Biotropica

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“…These small rodents are excellent models for studying speciation, as their small size, extremely well-adapted dentition for chewing hard foods, and use of a wide variety of foods and habitats allow them to utilize niches that are inaccessible to other mammalian species. Moreover, their interspecific differences in ecological traits and short life cycles allow for a high rate of recovery and diversification of the species in this group, especially in dynamic environments like most tropical ecosystems [Rocha et al, 2014].…”

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confidence: 99%

Cryptic Species in <b><i>Proechimys goeldii </i></b>(Rodentia, Echimyidae)? A Case of Molecular and Chromosomal Differentiation in Allopatric Populations

Costa¹,

Amaral²,

Pieczarka³

et al. 2016

Cytogenet Genome Res

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The spiny rats of the genus Proechimys have a wide distribution in the Amazon, covering all areas of endemism of this region. We analyzed the karyotype and cytochrome b (Cyt b) sequences in Proechimys goeldii from 6 localities representing 3 interfluves of the eastern Amazon. A clear separation of P. goeldii into 2 monophyletic clades was observed, both chromosomally and based on Cyt b sequences: cytotype A (2n = 26♀/27♂, NF = 42) for samples from the Tapajos-Xingu interfluve and cytotype B (2n = 24♀/25♂, NF = 42) for samples from the Xingu-Tocantins interfluve and east of the Tocantins River. The karyotypes differ in a pericentric inversion and a centric fusion/fission and an average nucleotide divergence of 6.1%, suggesting cryptic species. Meiotic analysis confirmed the presence of a XX/XY₁Y₂ multiple sex chromosome determination system for both karyotypes. The karyotypes also vary from the literature (2n = 24, NF = 42, XX/XY). The autosome translocated to the X chromosome is different both in size and morphology to P. cf. longicaudatus, which also has a multiple sex chromosome determination system (2n = 14♀/15♀♂/16♀/17♂, NF = 14). The Xingu River is a barrier that separates populations of P. goeldii, thus maintaining their allopatric nature and providing an explanation for the molecular and cytogenetic patterns observed for the Xingu River but not the Tocantins River.

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“…through annual recolonisation of floodplains from the surrounding landscape), so are likely to exhibit little genetic structure across the floodplain (Rocha et al . ). However, severe flash floods have a heavier toll on terrestrial fauna (Sousa ; Jardine et al .…”

Section: Discussionmentioning

confidence: 97%

Does extreme flooding drive vegetation and faunal composition across the Gulf Plains of north‐eastern Australia?

Crowley

Preece

2019

Austral Ecology

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High levels of sub-speciation in Australian mesic zone taxa have been attributed to the creation of biogeographic barriers by Pleistocene expansion of the arid zone. However, several of these barriers also align with major floodplains. The Carpentarian Barrier in the Gulf Plains (GUP)one of Australia's most significant biogeographic barriersexperiences extreme floods on a sub-decadal timescale. These floods rise suddenly, cover thousands of square kilometres to a depth of several metres and can take weeks to subside. We investigated whether these floods have shaped community composition. If this is the case, species that are particularly vulnerable to extreme floodingunderstorey animals and woody plants, particularly shrubsshould be under-represented, and grasslands should be over-represented on GUP floodplains. We used Akaike selection of logistic models to assess influence of floodplains and other potential drivers on grassland distribution and shrub abundance, and on representation of understorey fauna. We also compared post-flood faunal records with the bioregional data set to assess influence of the 2009 flood on representation of understorey reptiles. Grasslands and shrub-free vegetation were significantly over-represented and understorey fauna significantly under-represented on floodplains, even when the influences of other factors were taken into account. Understorey Gekkota were absent fromand understorey skinks under-represented inrecently flooded areas. Hence, floods appear to have shaped community composition on GUP floodplains by selectively displacing and/or destroying woody plantsparticularly shrubsand understorey animals. Our findings demonstrate association rather than causality, but show that further examination of the ecological and biogeographic impacts of extreme flooding is warranted. Influence of floods on the Australian biota should be considered an ongoing ecological and evolutionary driver, and one that is likely to intensify as extreme floods are expected to become more frequent under climate change.

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Seasonal flooding regime and ecological traits influence genetic structure of two small rodents

Cited by 21 publications

References 41 publications

Bird assemblages on Amazonian river islands: Patterns of species diversity and composition

Bird assemblages on Amazonian river islands: Patterns of species diversity and composition

Cryptic Species in <b><i>Proechimys goeldii </i></b>(Rodentia, Echimyidae)? A Case of Molecular and Chromosomal Differentiation in Allopatric Populations

Does extreme flooding drive vegetation and faunal composition across the Gulf Plains of north‐eastern Australia?

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