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  • 1
    Electronic Resource
    Electronic Resource
    Ecology Is speciation driven by species diversity? (2005)
    [s.l.] : Nature Publishing Group
    Nature 438.2005, 7064, E1-, (2 S.) 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Arising from: B. C. Emerson & N. Kolm Nature 434, 1015–1017 (2005); B. C. Emerson & N. Kolm reply Emerson and Kolm show that the proportion of species endemic to an island is positively related to its species ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04308
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Marine incursion into South America (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 396 (1998), S. 421-422 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Amazon basin harbours the most diverse assemblage of freshwater fishes in the world, including a disproportionately large number of marine-derived groups, such as stingrays, flatfishes, pufferfishes, and anchovies. On the basis of our molecular phylogenetic analysis of South American ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/24757
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Speciation by hybridization in Heliconius butterflies (2006)
    [s.l.] : Nature Publishing Group
    Nature 441 (2006), S. 868-871 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Speciation is generally regarded to result from the splitting of a single lineage. An alternative is hybrid speciation, considered to be extremely rare, in which two distinct lineages contribute genes to a daughter species. Here we show that a hybrid trait in an animal species can directly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04738
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    DNA fingerprints of a gorgonian coral: a method for detecting clonal structure in a vegetative species (1992)
    Springer
    Marine biology 114 (1992), S. 317-325 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Clonal reproduction, a common life history strategy among sessile marine invertebrates, can lead to high local abundances of one to a few genotypes in a population. Analysis of the clonal structure of such populations can provide insight into the ecological and evolutionary history of the population, but requires markers that can identify individual genets. Forensic and demographic studies have demonstrated that DNA fingerprinting can provide markers that are unique for an individual genotype. We have generated DNA fingerprints for over 70 colonies of the clonal gorgonian, Plexaura A (Plexaura sp. A) collected from June 1990 through July 1991 in the San Blas Islands, Panama. DNA fingerprints within a singic individual were identical and fingerprinting resolved multiple genotypes within and among reefs. On one reef in the San Blas Islands, Panama, 59% of the colonies sampled were of one genotype and this genotype was not found on any other sampled reefs. A previous study using tissue grafts identified 13 putative clones on these reefs, while DNA fingerprints of the same colonies differentiated 17 genotypes. The present study demonstrates the utility of DNA fingerprinting for distinguishing clones and for identifying clonal structure of marine invertebrate populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349534
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The Assembly of an Island Fauna by Natural Invasion: Sources and Temporal Patterns in the Avian Colonization of Barbados (1999)
    Springer
    Biological invasions 1 (1999), S. 33-41 
    Details
    ISSN: 1573-1464
    Keywords: Barbados ; Coereba flaveola ; colonization ; Columbina passerina ; community ecology ; Elaenia martinica ; invasion ; Lesser Antilles ; Loxigilla noctis ; Mitochondrial DNA ; Orthorhyncus cristatus ; Quiscalus lugubris ; Tiaris bicolor ; Vireo altiloquus ; West Indies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By virtue of their isolation and depauperate faunas, oceanic islands offer unique opportunities to characterize the historical development of ecological communities derived from both natural and anthropogenic invasions. Barbados, an outlying island in the Lesser Antilles, was formed approximately 700,000 YBP by tectonic uplift and was then colonized by birds via natural invasion from the much older volcanic islands in the main Lesser Antillean arc. We investigated the timing and sources of the avian invasion of Barbados by determining levels of mitochondrial DNA (mtDNA) divergence between populations of eight bird species from Barbados and those on the nearby putative source islands of St. Lucia and St. Vincent. Although all Barbados populations appeared to be young relative to the geological age of the island, we found differences among species in their inferred times of colonization and we identified at least two sources of immigrants to Barbados. In contrast to these historical differences across species and populations, our characterization of the mitochondrial genotypes of 231 individual birds suggests that each island population represents the descendants of a single founding maternal lineage. Considered in concert, the results of this molecular survey indicate that the Barbados bird community is composed of species with different invasion histories, which in turn suggests that the island's community composition has changed repeatedly over its 700,000 year history.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010090414598
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    Paper (German National Licenses)
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  • 6
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    Drift-driven evolution of electric signals in a Neotropical knifefish (2016)
    Wiley
    In:  Evolution, 70 (9). pp. 2134-2144.
    Details
    Publication Date: 2019-02-01
    Description: Communication signals are highly diverse traits. This diversity is usually assumed to be shaped by selective forces, whereas the null hypothesis of divergence through drift is often not considered. In Panama, the weakly electric fish Brachyhypopomus occidentalis is widely distributed in multiple independent drainage systems, which provide a natural evolutionary laboratory for the study of genetic and signal divergence in separate populations. We quantified geographic variation in the electric signals of 109 fish from five populations, and compared it to the neutral genetic variation estimated from cytochrome oxidase I (COI) sequences of the same individuals, to test whether drift may be driving divergence of their signals. Signal distances were highly correlated with genetic distances, even after controlling for geographic distances, suggesting that drift alone is sufficient to explain geographic variation in electric signals. Significant differences at smaller geographic scales (within drainages) showed, however, that electric signals may evolve at a faster rate than expected under drift, raising the possibility that additional adaptive forces may be contributing to their evolution. Overall, our data point to stochastic forces as main drivers of signal evolution in this species and extend the role of drift in the evolution of communication systems to fish and electrocommunication.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1111/evo.13010
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Population genetic analyses of Hypoplectrus coral reef fishes provide evidence that local processes are operating during the early stages of marine adaptive radiations (2008)
    Wiley
    In:  Molecular Ecology, 17 (6). pp. 1405-1415.
    Details
    Publication Date: 2015-09-14
    Description: Large-scale, spatially explicit models of adaptive radiation suggest that the spatial genetic structure within a species sampled early in the evolutionary history of an adaptive radiation might be higher than the genetic differentiation between different species formed during the same radiation over all locations. Here we test this hypothesis with a spatial population genetic analysis of Hypoplectrus coral reef fishes (Serranidae), one of the few potential cases of a recent adaptive radiation documented in the marine realm. Microsatellite analyses of Hypoplectrus puella (barred hamlet) and Hypoplectrus nigricans (black hamlet) from Belize, Panama and Barbados validate the population genetic predictions at the regional scale for H. nigricans despite the potential for high levels of gene flow between populations resulting from the 3-week planktonic larval phase of Hypoplectrus. The results are different for H. puella, which is characterized by significantly lower levels of spatial genetic structure than H. nigricans. An extensive field survey of Hypoplectrus population densities complemented by individual-based simulations shows that the higher abundance and more continuous distribution of H. puella could account for the reduced spatial genetic structure within this species. The genetic and demographic data are also consistent with the hypothesis that H. puella might represent the ancestral form of the Hypoplectrus radiation, and that H. nigricans might have evolved repeatedly from H. puella through ecological speciation. Altogether, spatial genetic analysis within and between Hypoplectrus species indicate that local processes can operate at a regional scale within recent marine adaptive radiations
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1365-294X.2007.03654.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Estimating dispersal from genetic isolation by distance in a coral reef fish (Hypoplectrus puella) (2009)
    ESA (Ecological Society of America)
    In:  Ecology, 90 (11). pp. 3087-3098.
    Details
    Publication Date: 2020-07-30
    Description: The spatial scale of dispersal in coral reef fishes eludes ecologists despite the importance of this parameter for understanding the dynamics of ecological and evolutionary processes. Genetic isolation by distance (IBD) has been used to estimate dispersal in coral reef fishes, but its application in marine systems has been limited by insufficient sampling at different spatial scales and a lack of information regarding population density. Here, we present an analysis of IBD in the barred hamlet (Hypoplectrus puella, Serranidae) at spatial scales ranging from 10 to 3200 km complemented with SCUBA surveys of population densities covering 94 000 m2 of reef. We used 10 hypervariable DNA markers to genotype 854 fish from 15 locations, and our results establish that IBD in H. puella emerges at a spatial scale of 175 km and is preserved up to the regional scale (3200 km). Assuming a normal or a Laplace dispersal function, our data are consistent with mean dispersal distances in H. puella that range between 2 and 14 km. Such small mean dispersal distances is a surprising result given the three-week pelagic larval duration of H. puella and the low level of genetic structure at the Caribbean scale (Wright's fixation index, FST, estimate = 0.005). Our data reinforce the importance of considering population density when estimating dispersal from IBD and underscore the relevance of sampling at local scales, even when genetic structure is weak at the regional scale.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1890/08-0859.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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