Phylogeography of the supralittoral isopod<i><scp>L</scp>igia occidentalis</i>around the Point Conception marine biogeographical boundary

Eberl, Renate; Mateos, Mariana; Grosberg, Richard K.; Santamaría, Carlos; Hurtado, Luis A.

doi:10.1111/jbi.12168

Cited by 41 publications

(72 citation statements)

References 51 publications

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“…Lastly, individuals from Cousine Island exhibit COI K2P divergences of 4.5–5.3% when compared to other localities (Mahé and Silhouette) within the inner islands. Interestingly, this pattern is similar to those previously reported for Seychellois herpetofauna from the inner islands (Rocha, Harris & Posada, 2011; Rocha, Posada & Harris, 2013; Silva et al, 2010) and to reports of cryptic diversity for other Ligia species, including L. occidentalis (Eberl et al, 2013; Hurtado, Mateos & Santamaria, 2010), L. hawaiensis (Santamaria et al, 2013; Taiti et al, 2003), L. baudiniana (Santamaria, Mateos & Hurtado, 2014), L. exotica and L. cinerascens (Yin et al, 2013), and L. oceanica (Raupach et al, 2014). The sum of our findings thus suggest the presence of 2–3 putative cryptic species of Ligia in the Seychelles: Aldabra Ligia being one, and those of Cousine and Silhouette + Mahé representing one or two putative species.…”

Section: Discussionsupporting

confidence: 89%

Cryptic biodiversity and phylogeographic patterns of SeychelloisLigiaisopods

Santamaría

Bluemel

Bunbury

et al. 2017

PeerJ

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Ligia isopods are conspicuous inhabitants of rocky intertidal habitats exhibiting several biological traits that severely limit their dispersal potential. Their presence in patchy habitats and low vagility may lead to long term isolation, allopatric isolation and possible cryptic speciation. Indeed, various species of Ligia have been suggested to represent instead cryptic species complexes. Past studies; however, have largely focused in Eastern Pacific and Atlantic species of Ligia, leaving in doubt whether cryptic diversity occurs in other highly biodiverse areas. The Seychelles consists of 115 islands of different ages and geological origins spread across the western Indian Ocean. They are well known for their rich biodiversity with recent reports of cryptic species in terrestrial Seychellois organisms. Despite these studies, it is unclear whether coastal invertebrates from the Seychelles harbor any cryptic diversity. In this study, we examined patterns of genetic diversity and isolation within Ligia isopods across the Seychelles archipelago by characterizing individuals from locations across both inner and outer islands of the Seychelles using mitochondrial and nuclear markers. We report the presence of highly divergent lineages of independent origin. At Aldabra Atoll, we uncovered a lineage closely related to the Ligia vitiensis cryptic species complex. Within the inner islands of Cousine, Silhouette, and Mahé we detected the presence of two moderately divergent and geographically disjunct lineages most closely related to Ligia dentipes. Our findings suggest that the Seychelles may harbor at least three novel species of Ligia in need of description and that these species may have originated independently.

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Section: Discussionsupporting

confidence: 89%

Cryptic biodiversity and phylogeographic patterns of SeychelloisLigiaisopods

Santamaría

Bluemel

Bunbury

et al. 2017

PeerJ

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“…Second, the broad distribution of this isopod spans multiple biogeographic regions (e.g., provinces and ecoregions), whose boundaries may constitute barriers for dispersal, as has been observed in other coastal isopods (e.g., Eberl et al. ). Our sampling in Brazil encompasses the boundary between the tropical southwestern Atlantic and the warm temperate southwestern Atlantic marine provinces (Spalding et al.…”

Section: Introductionmentioning

confidence: 81%

Multiple transisthmian divergences, extensive cryptic diversity, occasional long‐distance dispersal, and biogeographic patterns in a marine coastal isopod with an amphi‐American distribution

Hurtado

Mateos

Mattos

et al. 2016

Ecology and Evolution

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Excirolana braziliensis is a coastal intertidal isopod with a broad distribution spanning the Atlantic and Pacific tropical and temperate coasts of the American continent. Two separate regional studies (one in Panama and one in Chile) revealed the presence of highly genetically divergent lineages, implying that this taxon constitutes a cryptic species complex. The relationships among the lineages found in these two different regions and in the rest of the distribution, however, remain unknown. To better understand the phylogeographic patterns of E. braziliensis, we conducted phylogenetic analyses of specimens from much of its entire range. We obtained DNA sequences for fragments of four mitochondrial genes (16S rDNA, 12S rDNA, COI, and Cytb) and also used publicly available sequences. We conducted maximum likelihood and Bayesian phylogenetic reconstruction methods. Phylogeographic patterns revealed the following: (1) new highly divergent lineages of E. braziliensis; (2) three instances of Atlantic–Pacific divergences, some of which appear to predate the closure of the Isthmus of Panama; (3) the distributional limit of highly divergent lineages found in Brazil coincides with the boundary between two major marine coastal provinces; (4) evidence of recent long‐distance dispersal in the Caribbean; and (5) populations in the Gulf of California have closer affinities with lineages further south in the Pacific, which contrasts with the closer affinity with the Caribbean reported for other intertidal organisms. The high levels of cryptic diversity detected also bring about challenges for the conservation of this isopod and its fragile environment, the sandy shores. Our findings underscore the importance of comprehensive geographic sampling for phylogeographic and taxonomical studies of broadly distributed putative species harboring extensive cryptic diversity.

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“…Evidence indicated that increasing seasonality and steepening of the sea surface temperature (SST) gradient that were most significant between 2.4 and 2.2 mya occurred in the ancient ECS, were located in the subtropics, whereas the ancient SCS located in the tropics showed minor or no cooling. Nonetheless, study of an isopod in North America and of a marine clam in Australia revealed that SST gradients can also be primary drivers of cladogenesis (Eberl, Mateos, Grosberg, Santamaria, & Hurtado, ; Li, Foighil, & Park, ). The SST gradient between the ECS and the SCS possibly also exerted an effect on the divergence of the clades studied here.…”

Section: Discussionmentioning

confidence: 99%

Cryptic diversity of marine gastropod Monodonta labio (Trochidae): did the early Pleistocene glacial isolation and sea surface temperature gradient jointly drive diversification of sister species and/or subspecies in the Northwestern Pacific?

Zhao

Kong

et al. 2017

Marine Ecology

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Formation of glacial refugia during the Pleistocene climatic oscillations has been put forward to elucidate the diversification of marine organisms in the north‐western Pacific. The marine gastropod Monodonta labio is one of the most common species in the Northwestern Pacific and possibly possesses cryptic diversity. Here, we investigate the phylogeographic pattern of this species to test the potential mechanisms driving its diversification in the Northwestern Pacific. Genetic information for two mitochondrial genes (Cytochrome oxidase subunit I and 16S rDNA) and one nuclear gene (internal transcribed spacer 1) was acquired to detect genetic structuring and to reconstruct the gastropod's phylogenetic history. Our results revealed that M. labio is comprised of five main clades, and divergence time estimates place their cladogenesis as corresponding to the initiation (c. 2.5 mya) and intensification (c. 0.9 mya) of large‐scale Northern Hemisphere ice sheets. The early and middle Pleistocene divergence times are consistent with the emergence times of the Dongshan land bridge, which would seperate the ancient East China Sea and the ancient South China Sea forming two potential refugia. In addition, the deep trough in the Qiongzhou Strait would possibly act as another potential refugium with the uplift of the Qiongzhou Strait at mid‐Pleistocene. This study suggests that the current genetic architecture of M. labio is probably correlated with glacial isolation and sea surface temperature gradient. We also put forward the possibility that these factors were probably an important driver for the diversification of sister species or subspecies of other taxa in the Northwestern Pacific.

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Phylogeography of the supralittoral isopodLigia occidentalisaround the Point Conception marine biogeographical boundary

Cited by 41 publications

References 51 publications

Cryptic biodiversity and phylogeographic patterns of SeychelloisLigiaisopods

Cryptic biodiversity and phylogeographic patterns of SeychelloisLigiaisopods

Multiple transisthmian divergences, extensive cryptic diversity, occasional long‐distance dispersal, and biogeographic patterns in a marine coastal isopod with an amphi‐American distribution

Cryptic diversity of marine gastropod Monodonta labio (Trochidae): did the early Pleistocene glacial isolation and sea surface temperature gradient jointly drive diversification of sister species and/or subspecies in the Northwestern Pacific?

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