scholarly journals Evidence for multiple founding lineages and genetic admixture in the evolution of species within an oceanic island weevil (Coleoptera, Curculionidae) super-radiation

2015 ◽  
Vol 43 (1) ◽  
pp. 178-191 ◽  
Author(s):  
Christiana M. A. Faria ◽  
Antonio Machado ◽  
Isabel R. Amorim ◽  
Matthew J. G. Gage ◽  
Paulo A. V. Borges ◽  
...  
Keyword(s):  
Oceanic Island ◽  
Genetic Admixture

Biology of the invasive delicate skink (Lampropholis delicata) on Lord Howe Island

2014 ◽  
Vol 62 (6) ◽  
pp. 498 ◽  
Author(s):  
David G. Chapple ◽  
Kimberly A. Miller ◽  
Kirilee Chaplin ◽  
Louise Barnett ◽  
Michael B. Thompson ◽  
...  
Keyword(s):  
Clutch Size ◽  
Native Species ◽  
Oceanic Island ◽  
Genetic Admixture ◽  
Population Declines ◽  
Invertebrate Fauna ◽  
Lord Howe Island ◽  
South West ◽  
Eastern Australia ◽  
Potential Impact

Lord Howe Island (LHI) is a remote oceanic island in the south-west Pacific that is World Heritage listed due to its diverse, and largely endemic, biota. A suite of introduced species have colonised the island, resulting in the widespread population declines of many native species. The delicate skink (Lampropholis delicata DeVis) was accidentally introduced to LHI from mainland eastern Australia, but there has been no detailed investigation of its biology on the island, or its potential impact on the native biota. We conducted a detailed study of the distribution and biology of the delicate skink on LHI over a six-year period (2007–12). The delicate skink was introduced to LHI in the 1980s, and rapidly spread across the island. It presently occurs in all 21 low-elevation vegetation communities on LHI. The delicate skink is diurnal on LHI, and displays seasonal variation in activity with a peak in November–December. The delicate skink exhibits sexual dimorphism with females having larger body and abdomen sizes and males having longer and broader heads, although the degree of genetic admixture may influence morphology on LHI. Females reproduce in spring and summer (September–February), with a positive relationship between body size and clutch size. Clutch size ranges from 1 to 7 (mean 3.4) and communal egg nests (11–200+ eggs) are common. Tail loss is common on LHI (55%), but is more frequent in adults and females. We conclude that, based on its distribution and abundance, the delicate skink has the potential to impact the diverse and endemic invertebrate fauna on LHI.

Invasive Species Appear to Disrupt the Top-Down Control of Herbivory on a Mexican Oceanic Island

2019 ◽  
Vol 73 (1) ◽  
pp. 1
Author(s):  
Betsabé Ruiz-Guerra ◽  
Ana Aguilar-Chama ◽  
Salvador González de León ◽  
Roger Guevara
Keyword(s):  
Invasive Species ◽  
Oceanic Island ◽  
Top Down

A REVIEW OF CHAITENIA: A DEVONIAN OCEANIC ISLAND ARC ACCRETED TO PATAGONIA SOUTH OF CHILENIA, SOUTH AMERICA

2019 ◽  
Author(s):  
C. Mark Fanning ◽  
◽  
Francisco Hervé ◽  
Mauricio N. Calderón ◽  
Robert J. Pankhurst ◽  
...  
Keyword(s):  
South America ◽  
Oceanic Island ◽  
Island Arc

scholarly journals Complex genetic admixture histories reconstructed with Approximate Bayesian Computation

2021 ◽  
Author(s):  
Cesar A. Fortes‐Lima ◽  
Romain Laurent ◽  
Valentin Thouzeau ◽  
Bruno Toupance ◽  
Paul Verdu
Keyword(s):  
Approximate Bayesian Computation ◽  
Genetic Admixture ◽  
Bayesian Computation ◽  
Approximate Bayesian

African and European genetic admixture in African American IBD patients

2008 ◽  
Vol 14 ◽  
pp. S8 ◽  
Author(s):  
M Wang ◽  
S Kugathasan ◽  
J Cho ◽  
K Isaacs ◽  
J Lewis ◽  
...  
Keyword(s):  
African American ◽  
Genetic Admixture

Le terrane de Slide Mountain (Cordillères canadiennes) : une lithosphère océanique marquée par des points chauds

2003 ◽  
Vol 40 (6) ◽  
pp. 833-852 ◽  
Author(s):  
M Tardy ◽  
H Lapierre ◽  
D Bosch ◽  
A Cadoux ◽  
A Narros ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Oceanic Island ◽  
Light Rare Earth ◽  
Isotopic Compositions ◽  
Incompatible Elements ◽  
Depleted Mantle ◽  
Mantle Sources ◽  
British Colombia ◽  
Ultramafic Cumulates ◽  
Back Arc

The Slide Mountain Terrane consists of Devonian to Permian siliceous and detrital sediments in which are interbedded basalts and dolerites. Locally, ultramafic cumulates intrude these sediments. The Slide Mountain Terrane is considered to represent a back-arc basin related to the Quesnellia Paleozoic arc-terrane. However, the Slide Mountain mafic volcanic rocks exposed in central British Colombia do not exhibit features of back-arc basin basalts (BABB) but those of mid-oceanic ridge (MORB) and oceanic island (OIB) basalts. The N-MORB-type volcanic rocks are characterized by light rare-earth element (LREE)-depleted patterns, La/Nb ratios ranging between 1 and 2. Moreover, their Nd and Pb isotopic compositions suggest that they derived from a depleted mantle source. The within-plate basalts differ from those of MORB affinity by LREE-enriched patterns; higher TiO2, Nb, Ta, and Th abundances; lower εNd values; and correlatively higher isotopic Pb ratios. The Nd and Pb isotopic compositions of the ultramafic cumulates are similar to those of MORB-type volcanic rocks. The correlations between εNd and incompatible elements suggest that part of the Slide Mountain volcanic rocks derive from the mixing of two mantle sources: a depleted N-MORB type and an enriched OIB type. This indicates that some volcanic rocks of the Slide Mountain basin likely developed from a ridge-centered or near-ridge hotspot. The activity of this hotspot is probably related to the worldwide important mantle plume activity that occurred at the end of Permian times, notably in Siberia.

West Asian colonisation of topmouth gudgeon, Pseudorasbora parva (Teleostei: Gobionidae): Genetic admixture at the crossroad of Europe and east Asia

2020 ◽  
Author(s):  
Zohreh Ganjali ◽  
Hamid Reza Esmaeili ◽  
Fatah Zarei ◽  
Golnaz Sayyadzadeh ◽  
Soheil Eagderi ◽  
...  
Keyword(s):  
East Asia ◽  
Genetic Admixture ◽  
Pseudorasbora Parva ◽  
Topmouth Gudgeon

scholarly journals Feeding patterns of two sympatric shark predators in coastal ecosystems of an oceanic island

2017 ◽  
Vol 74 (2) ◽  
pp. 216-227 ◽  
Author(s):  
Clément Trystram ◽  
Karyne M. Rogers ◽  
Marc Soria ◽  
Sébastien Jaquemet
Keyword(s):  
Trophic Ecology ◽  
Dietary Habits ◽  
Stomach Contents ◽  
Nitrogen Isotope ◽  
Oceanic Island ◽  
Apex Predators ◽  
Coastal Habitat ◽  
Galeocerdo Cuvier ◽  
Carcharhinus Leucas ◽  
Bull Shark

Stomach contents and stable carbon and nitrogen isotope analyses (δ13C and δ15N) were used to investigate the trophic ecology of two apex predators, tiger sharks (Galeocerdo cuvier) and bull sharks (Carcharhinus leucas), from Reunion Island to describe their dietary habits at both the population and individual levels. In this oceanic island, the tiger and bull sharks were more piscivorous and teutophagous than noted in previous research from other localities. The δ13C values suggested that bull sharks depended on more neritic organic matter sources than tiger sharks, confirming a coastal habitat preference for bull sharks. Moreover, the total length of the bull shark influenced δ13C values, with smaller individuals being more coastal than larger individuals. All indicators suggest that there is a higher degree of similarity between individual tiger sharks compared with the more heterogeneous bull shark population, which is composed of individuals who specialize on different prey. These results suggest that the two species have different functions in these coastal habitats, and thus, they must be considered independently in terms of conservation and management.

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