Geographic isolation and elevational gradients promote diversification in an endemic shrew on Sulawesi

Eldridge, Ryan Andrew; Achmadi, Anang S.; Giarla, Thomas C.; Rowe, Kevin C.; Esselstyn, Jacob A.

doi:10.1016/j.ympev.2017.09.018

Cited by 20 publications

(30 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The geographical structure of morphological and genetic variation in these macaques is now relatively well studied (Bynum, Bynum, & Supriatna, ; Ciani, Stanyon, Scheffrahn, & Sampurno, ; Evans, Morales, Supriatna, & Melnick, ; Evans, Supriatna, Andayani, & Melnick, ), and their hybrid zones, together with concordant phylogeographical breaks in two groups of amphibians (Evans, Brown et al., ; Evans, Supriatna, Andayani, Setiadi et al., ), were used to define seven areas of endemism (AoE) on Sulawesi (Figure b). Studies of other animal groups also have found extensive, geographically partitioned diversity, much of which is concordant with at least some of the AoE boundaries (see debate in Bridle, Pedro, & Butlin, ; Evans, Cannatella, & Melnick, ; Evans, McGuire, Brown, Andayani, & Supriatna, ; Eldridge, Achmadi, Giarla, Rowe, & Esselstyn, ).…”

Section: Introductionmentioning

confidence: 84%

Isolation by marine barriers and climate explain areas of endemism in an island rodent

Giarla

Maher

Achmadi

et al. 2018

Journal of Biogeography

Self Cite

View full text Add to dashboard Cite

Aim:The Indonesian island of Sulawesi is home to thousands of endemic terrestrial animal species. Phylogeographical studies of some of these taxa revealed concordant distribution patterns (areas of endemism; AoEs), suggestive of a shared evolutionary or ecological mechanism driving divergence among various terrestrial taxa. Generally, AoEs have been attributed to Pleistocene marine incursions, geological fault zones and Sulawesi's history as an archipelago. We test, for the first time, the hypothesis that population divergences are associated with unsuitable climate spaces at the boundaries between these areas.Location: Sulawesi, Indonesia.Taxon: Maxomys musschenbroekii, a common murid rodent endemic to Sulawesi. Methods:We sequenced a mitochondrial gene, four nuclear protein-coding genes and hundreds of ultraconserved elements from individuals sampled across the island, which we used to build intraspecific phylogenies and identify population structure.To test climate-related hypotheses, we used multiple regression to assess the extent to which genetic distances, over-land geographical distances, environmental distances (derived from ecological niche model resistance surfaces) and areas of endemism are correlated. Results:In all three genetic datasets, we inferred phylogeographical structure that is geographically concordant with previously defined AoEs. Ecological niche models showed a similar geography of suitability across the island since the Last Glacial Maximum, with varying levels of unsuitable climate space between AoEs. Genetic distances were more strongly correlated with environmental distances than geographical distances and interspecific divergences arose just in the past 1.5 Myr. Main Conclusions: Population divergences within M. musschenbroekii are consistent with AoE definitions from other taxa. Stable areas of unsuitable habitat near AoE boundaries probably supplemented marine incursions in generating population structure within M. musschenbroekii and other co-distributed species. K E Y W O R D S areas of endemism, ecological niche models, isolation by environment, Maxomys musschenbroekii, Muridae, phylogeography, Sulawesi, ultraconserved elements

show abstract

Section: Introductionmentioning

confidence: 84%

Isolation by marine barriers and climate explain areas of endemism in an island rodent

Giarla

Maher

Achmadi

et al. 2018

Journal of Biogeography

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, sister species in several vertebrate clades overlap considerably in their elevational ranges in Neotropical mountains (Cadena et al, 2012), suggesting that speciation occurs most often in allopatry within elevational zones and thus that elevational replacements result predominantly from secondary contact (but see Kozak & Wiens, 2007). Work on this topic in other tropical regions has been more limited, yet evidence from Africa (Fuchs et al, 2011) and southeast Asia (Moyle et al, 2017) also indicates secondary contact is the most likely explanation for elevational replacements (but see Bryja et al, 2018;Eldridge et al, 2018). Likewise, assembly of biotas in other mountain systems often results more from colonization by lineages from other regions than from diversification within mountains (Johansson et al, 2007;Merckx et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Origin of elevational replacements in a clade of nearly flightless birds – most diversity in tropical mountains accumulates via secondary contact following allopatric speciation

Cadena

Céspedes

2019

Preprint

View full text Add to dashboard Cite

Tropical mountains are biodiversity hotspots. In particular, mountains in the Neotropics exhibit remarkable beta diversity reflecting species turnover along elevational gradients. Elevational replacements of species have been known since early surveys of the tropics, but data on how such replacements arise are scarce, limiting our understanding of mechanisms underlying patterns of diversity. We employed a phylogenetic framework to evaluate hypotheses accounting for the origin of elevational replacements in the genus Scytalopus (Rhinocryptidae), a speciose clade of passerine birds with limited dispersal abilities occurring broadly in the Neotropical montane region. We found that species of Scytalopus have relatively narrow elevational ranges, closely related species resemble each other in elevational distributions, and most species replacing each other along elevational gradients are distantly related to each other. Although we cannot reject the hypothesis that a few elevational replacements may reflect parapatric speciation along mountain slopes, we conclude that speciation in Scytalopus occurs predominantly in allopatry within elevational zones, with most elevational replacements resulting from secondary contact of formerly allopatric lineages. Our study suggests that accumulation of species diversity in montane environments reflects colonization processes as opposed to in situ divergence even in dispersal-limited animals.

show abstract

“…This finding could be explained by the presence of cryptic species pairs or genetic differentiation separating low-and high-elevation populations. Supporting this hypothesis, some studies of small mammals in Southeast Asia have found strong, cryptic genetic differentiation across elevations, such as in squirrels (den Hinckley et al, 2020;den Tex et al, 2010), shrews (Eldridge et al, 2018) and mice (Heaney et al, 2011;Justiniano et al, 2015). However, McCain (2009) suggest that these phenotypic changes, in combination with behaviours including diurnal activity patterns and nesting, may allow the species to persist across broad environmental conditions, which is rare among small mammals in this landscape (Camacho-Sanchez et al, 2019;Hinckley et al, in review;Nor, 2001).…”

Section: Levels Of Gene Flow Across Elevationsmentioning

confidence: 98%

Little genetic structure in a Bornean endemic small mammal across a steep ecological gradient

et al. 2020

View full text Add to dashboard Cite

Tropical ecosystems are global hotspots of biodiversity and endemism. To explain the higher diversity in lower latitude regions, Janzen (1967) proposed that the greater temporal thermal stability and spatial environmental heterogeneity on tropical mountains should select for narrow thermal tolerances, which in turn reduce effective dispersal and increase population isolation across elevational gradients (Ghalambor et al., 2006; Gill et al., 2016). Numerous studies support the first prediction of the hypothesis that species in the

show abstract

Geographic isolation and elevational gradients promote diversification in an endemic shrew on Sulawesi

Cited by 20 publications

References 60 publications

Isolation by marine barriers and climate explain areas of endemism in an island rodent

Isolation by marine barriers and climate explain areas of endemism in an island rodent

Origin of elevational replacements in a clade of nearly flightless birds – most diversity in tropical mountains accumulates via secondary contact following allopatric speciation

Little genetic structure in a Bornean endemic small mammal across a steep ecological gradient

Contact Info

Product

Resources

About