Kristina M Sefc

Kristina M Sefc
Karl-Franzens-Universität Graz | KFU Graz · Institute of Zoology

About

250
Publications
59,381
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
5,511
Citations

Publications

Publications (250)
Article
Full-text available
Background Sex-biased dispersal is a common and widespread phenomenon that can fundamentally shape the genetic structure of the social environments in which animals live. For animals that live in and move between social groups, sex-biased dispersal can result in an asymmetry in the degree of relatedness among cohabiting males and females, which can...
Preprint
Full-text available
Comparing gene regulatory patterns between seemingly similar phenotypic traits can provide important insights on the molecular mechanisms underlying the evolution of those traits. In this study, we investigate the molecular basis of the formation of a spade-shaped caudal fin, which is a rare phenotype among teleost fish characterized by an elongate...
Article
Full-text available
Group‐living animals are often faced with complex reproductive decisions, namely how to partition within‐group reproduction, how to obtain extra‐group reproduction, and how these two means of reproduction should be balanced. The solutions to these questions can be difficult to predict because ecological conditions can affect the scopes for within‐g...
Article
Full-text available
The famously diverse body coloration of cichlid fish serves communicative functions in mating and social interactions including competition for resources. Here, we examined the effects of a color pattern trait—the width of a yellow bar on a black body—on territorial competition in males and females of a color variant (“Ikola”) of the Lake Tanganyik...
Article
Full-text available
Adverse conditions during early life can cause lasting body size deficits with effects on social and sexual competition, while an accelerated growth response can allow animals to catch up in body size but can be physiologically costly as well. How animals balance growth deficits and growth compensation is predicted to depend on the effects of each...
Article
Full-text available
Keywords: aggression biparental care cichlid fish mate removal parental investment sex role territoriality In many animal systems, the defence of a territory or nest coincides with the defence of offspring, and it is often unclear whether the defence behaviour exists for the purpose of offspring protection, territory protection or a combination of...
Article
Full-text available
Carotenoid pigments play a major role in animal body colouration, generating strong interest in the genes involved in the metabolic processes that lead from their dietary uptake to their storage in the integument. Here, we used RNA sequencing (RNA-Seq) to test for differentially expressed genes in a taxonomically replicated design using three pairs...
Article
Full-text available
Aim Population connectivity of benthic marine organisms depends strongly on planktonic larval dispersal and is controlled by geographic distance and oceanographic structure. We examine isolation by distance versus resistance to barriers (ocean current boundaries) against a background of post‐glacial habitat expansion in a small benthic fish of the...
Article
Full-text available
The otoliths of teleost fishes exhibit a great deal of inter- and intra-species shape variation. The ecomorphology of the saccular otolith is often studied by comparing its shape across species and populations inhabiting a range of environments. However, formal tests are often lacking to examine how closely variation in otolith shape follows the ge...
Article
Full-text available
Growth patterns of the lesser Neptune grass, Cymodocea nodosa, and the distribution of epifauna and epiflora along its leaves were studied from May to October 2014 at two different depths (1.5 and 5 m) in the northern Adriatic Sea (Pula, Croatia). Generally, seagrass biomass, shoot density and number of leaves per shoot were higher in the shallow w...
Article
Full-text available
Background: Carotenoids contribute significantly to animal body coloration, including the spectacular color pattern diversity among fishes. Fish, as other animals, derive carotenoids from their diet. Following uptake, transport and metabolic conversion, carotenoids allocated to body coloration are deposited in the chromatophore cells of the integu...
Article
Full-text available
Background: Raising unrelated offspring is typically wasteful of parental resources and so individuals are expected to reduce or maintain low levels of parental effort when their parentage is low. This can involve facultative, flexible adjustments of parental care to cues of lost parentage in the current brood, stabilizing selection for a low leve...
Article
Full-text available
Blooms of gelatinous zooplankton can represent dramatic environmental perturbations for aquatic ecosystems. Yet, we still know little about how blooms impact fitness-related behaviours of fish caught within their areas of effect, especially for freshwater systems. Here, we documented the behavioural impacts of freshwater hydrozoan (Limnocnida tanga...
Article
Full-text available
Comparative analyses of gene regulation inform about the molecular basis of phenotypic trait evolution. Here, we address a fin shape phenotype that evolved multiple times independently across teleost fish, including several species within the family Cichlidae. In a previous study, we proposed a gene regulatory network (GRN) involved in the formatio...
Article
Full-text available
In the absence of dispersal barriers, species with great dispersal ability are expected to show little, if at all, phylogeographic structure. The East African Great Lakes and their diverse fish faunas provide opportunities to test this hypothesis in pelagic fishes, which are presumed to be highly mobile and unrestricted in their movement by physica...
Article
Full-text available
Background In socially monogamous species, reproduction is not always confined to paired males and females. Extra-pair males commonly also reproduce with paired females, which is traditionally thought to be costly to the females’ social partners. However, we suggest that when the relatedness between reproducing individuals is considered, cuckolded...
Article
Full-text available
Selection arising from social competition over non-mating resources, i.e. resources that do not directly and immediately affect mating success, offers a powerful alternative to sexual selection to explain the evolution of conspicuous ornaments, particularly in females. Here, we address the hypothesis that competition associated with the territorial...
Article
Full-text available
A species list of gastropods on several mountain summits in the Gesäuse region was generated, as the knowledge of the species composition of alpine areas will serve as valuable reference for further surveys and monitoring in the view of global warming. During the Workshop Alpine Landsnails 2017, the participants spent two days at the alpine refuge...
Article
Full-text available
Extra‐pair paternity within socially monogamous mating systems is well‐studied in birds and mammals but rather neglected in other animal taxa. In fishes, social monogamy has evolved several times but few studies have investigated the extent to which pair‐bonded male fish lose fertilizations to cuckolders and gain extra‐pair fertilizations themselve...
Article
Full-text available
Variation in fin shape and size contributes to the outstanding morphological diversity of teleost fishes, but the regulation of fin growth has not yet been studied extensively outside the zebrafish model. A previous gene expression study addressing the ornamental elongations of unpaired fins in the African cichlid fish Neolamprologus brichardi iden...
Article
Full-text available
The diversity of fin morphology within and across fish taxa offers great, but still largely unexplored, opportunities to investigate the proximate mechanisms underlying fin shape variation. Relying on available genetic knowledge brought forth mainly by the comprehensive study of the zebrafish caudal fin, we explored candidate molecular mechanisms f...
Article
Full-text available
Morphological differentiation among closely related species provides opportunities to study mechanisms shaping natural phenotypic variation. Here, we address variation in the orientation of melanin-colored body stripes in three cichlid species of the tribe Haplochromini. Melanochromis auratus displays a common pattern of dark, straight horizontal b...
Data
Relative expression levels of target genes The expression levels of 11 candidate target genes were compared between anterior and posterior regions of the middle black stripe in three Malawi cichlid species. The relative expression levels in each region are divided by the relative expression of the melanophore marker gene slc24a5 in that region in o...
Data
List of predicted transcription factor binding sites
Data
Raw Cq values and results of the statistical tests
Data
Relative expression levels of genes co-expressed with pmel, sdf1a and fbxw4 The expression levels of candidate co-expressed genes were compared between anterior and posterior regions of the middle black stripe in three Malawi cichlid species. The relative expression levels in each region are divided by the relative expression of the melanophore mar...
Data
Relative expression levels of predicted transcription factors The expression levels of predicted TFs were compared between anterior and posterior regions of the middle black stripe in three Malawi cichlid species. The relative expression levels in each region are divided by the relative expression of melanophore marker gene slc24a5 in that region i...
Data
qPCR Primer sequences and gene information
Data
List of coexpressed candidate genes
Presentation
Full-text available
Unnoticed by the public, initiatives for oil exploration are advanced in Africa’s largest freshwater reservoirs, including Lakes Tanganyika, Malawi and lately Albert, threatening their ecosystems and biota. It is imperative that environmental impact assessments are conducted by independent organizations to ensure that decisions on this matter are b...
Article
Full-text available
Introgression patterns between divergent lineages are often characterized by asymmetry in the direction and among-marker variation in the extent of gene flow, and therefore inform on the mechanisms involved in differentiation and speciation. In the present study, we test the hypothesis that unidirectional introgression between two phenotypically an...
Article
Full-text available
Stenotopic specialization to a fragmented habitat promotes the evolution of genetic structure. It is not yet clear whether small-scale population structure generally translates into large-scale intraspecific divergence. In the present survey of mitochondrial genetic structure in the Lake Tanganyika endemic Altolamprologus (Teleostei, Cichlidae), a...
Article
Full-text available
The establishment of hybrid taxa relies on reproductive isolation from the parental forms, typically achieved by ecological differentiation. Here, we present an alternative mechanism, in which shifts in the strength and location of dispersal barriers facilitate diversification by hybridisation. Our case study concerns the highly diverse, stenotopic...
Article
Full-text available
Fish color patterns are among the most diverse phenotypic traits found in the animal kingdom. Understanding the molecular and cellular mechanisms that control in chromatophore distribution and pigmentation underlying this diversity is a major goal in developmental and evolutionary biology, which has predominantly been pursued in the zebrafish model...
Data
Information about qPCR primers used in this study
Data
Expression analysis of candidate reference genes in fins of N. meeli Expression profiles of candidate reference genes in raw Cq values for all samples (12 fin samples for each of 4 adult fishes). The middle line denotes the median and boxes indicate the 25/75 percentiles.
Data
List of predicted transcription factor binding sites
Data
Relative expression of the melanosome marker gene slc24a5 plotted against melanophore density (cells/mm2) The fins and anatomical regions within fins are coded by different colours and symbols, respectively.
Data
Results of the statistical tests
Article
Full-text available
As the world’s demands for hydrocarbons increase, remote areas previously made inaccessible by technological limitations are now being prospected for oil and gas deposits. Virtually unnoticed by the public, such activities are ongoing in the East African Great Lakes region, threatening these ecosystems famed for their hyper-diverse biota, includin...
Article
Full-text available
1.The homoplasy excess test (HET) is a tree-based screen for hybrid taxa in multi-locus nuclear phylogenies. Homoplasy between a hybrid taxon and the clades containing the parental taxa reduces bootstrap support in the tree. The HET is based on the expectation that excluding the hybrid taxon from the dataset increases the bootstrap support for the...
Article
Full-text available
A recent study of North American canids by Rutledge et al. (Biol. Lett. 11, 20150303 (doi:10.1098/rsbl.2015.0303)) refutes the hypothesized hybrid origin of the eastern wolf (EW) based on genomic evidence against very recent hybridization. However, the analyses do not rule out the possibility of more ancient hybridization. Claims to have resolved t...
Article
Full-text available
Mating system variability is known to exist between and within species, often due to environmental influences. An open question is whether, vice versa, similar environmental conditions entail congruent mating behavior, for example in terms of multiple paternity, in species or populations sharing largely comparable breeding modes. This study employe...
Data
A list and description of functions in the HEXT program.
Data
Hybrid signal in a SNP-based phylogeny of the genus Vitis (grape and relatives).
Data
Hybrid populations in Tropheus moorii (Cichlidae).
Data
Hybridization among North American wolf-like Canidae.
Data
HET results with simulated datasets.