Samuel Roch
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View article: Site-specific survey and reference data reveal drivers of fish community diversity changes in southwest Germany
Site-specific survey and reference data reveal drivers of fish community diversity changes in southwest Germany Open
Despite efforts to minimize human impact on rivers, native teleost fish and lamprey species communities in Germany remain threatened. The aim of the study was to quantify current species diversity in the study area, identify the level of d…
View article: New insights into the collapse of Upper Lake Constance whitefish (<i>Coregonus wartmanni</i>) and the impact of commercial fisheries management
New insights into the collapse of Upper Lake Constance whitefish (<i>Coregonus wartmanni</i>) and the impact of commercial fisheries management Open
The whitefish Coregonus wartmanni is the key fishery resource in Upper Lake Constance (ULC), one of Central Europe’s largest lakes. A significant stock decline resulted in the closure of the commercial whitefish fishery in 2024. Reasons fo…
View article: Non-random mating behaviour between diverging littoral and pelagic three-spined sticklebacks in an invasive population from Upper Lake Constance
Non-random mating behaviour between diverging littoral and pelagic three-spined sticklebacks in an invasive population from Upper Lake Constance Open
Adaptive divergence and increased genetic differentiation among populations can lead to reproductive isolation. In Lake Constance, Germany, a population of invasive three-spined stickleback ( Gasterosteus aculeatus ) is currently diverging…
View article: Characterization of specialist European catfish anglers in southern Germany: Implications for future management
Characterization of specialist European catfish anglers in southern Germany: Implications for future management Open
The European catfish (Silurus glanis) is a large apex predator native to Eastern Europe. Increasing populations within and outside the species' native range in recent years, and its popularity with recreational anglers are fueling discussi…
View article: Intra-lake origin and rapid expansion of invasive pelagic three-spined stickleback in Lake Constance
Intra-lake origin and rapid expansion of invasive pelagic three-spined stickleback in Lake Constance Open
The rapid expansion of three-spined stickleback ( Gasterosteus aculeatus Linnaeus, 1758 (Perciformes, Gasterosteida)) in the pelagic zone of Lake Constance, Central Europe, since 2012 contributed to stark ecosystem-wide effects, such as fo…
View article: Genetic differentiation and phenotypic plasticity drive troglomorphic character development in European cavefish
Genetic differentiation and phenotypic plasticity drive troglomorphic character development in European cavefish Open
The Aach cave loach (Barbatula barbatula), a recently discovered member of the Nemacheilidae family, offers a unique opportunity to understand the mechanisms underlying evolutionary change. In a common garden experiment, we reared groups o…
View article: Massive Fish Kill After the Discharge of Artificial Fertilizer into a Species Rich River in Southwestern Germany: a Conservation Case Study
Massive Fish Kill After the Discharge of Artificial Fertilizer into a Species Rich River in Southwestern Germany: a Conservation Case Study Open
In the summer of 2015, large amounts of artificial fertilizer containing ammonium nitrate were accidentally discharged into the Jagst River along with water used to extinguish a serious fire. The incident caused a massive fish kill the fir…
View article: Endangered spined loach <i>Cobitis</i> species in Southwest Germany: A complex network of native, hybrid and newly emerged populations
Endangered spined loach <i>Cobitis</i> species in Southwest Germany: A complex network of native, hybrid and newly emerged populations Open
Successful conservation of cryptic species such as representatives of the genus Cobitis presents a challenge for fishery managers. Only Cobitis taenia L. is currently assumed to occur in southwest Germany, where it is classified as critica…
View article: Phenotypic plasticity and genetic differentiation drive troglomorphic character development in European cave loach
Phenotypic plasticity and genetic differentiation drive troglomorphic character development in European cave loach Open
Using a cross-fostering experiment, we provide evidence for the contribution of both genetic differentiation and phenotypic plasticity to troglomorphic character development in the recently discovered cave form of Barbatula barbatul a, an …
View article: raw data
raw data Open
uploaded are raw data of eDNA and microsatellite analyses and landmarks used in morphometric analyses. For detailed information see XXX.
View article: Cryptic persistence and loss of local endemism in <scp>L</scp>ake <scp>C</scp>onstance charr subject to anthropogenic disturbance
Cryptic persistence and loss of local endemism in <span>L</span>ake <span>C</span>onstance charr subject to anthropogenic disturbance Open
In the welcome circumstance that species believed extinct are rediscovered, it is often the case that biological knowledge acquired before the presumed extinction is limited. Efforts to address these knowledge gaps, in particular to assess…
View article: Rapid intralacustrine evolution of an invasive pelagic three-spined stickleback (<i>Gasterosteus aculeatus</i>) ecotype in Lake Constance
Rapid intralacustrine evolution of an invasive pelagic three-spined stickleback (<i>Gasterosteus aculeatus</i>) ecotype in Lake Constance Open
The rapid invasion of the pelagic zone in Lake Constance by three-spined sticklebacks ( Gasterosteus aculeatus ) since 2012 and their subsequent drastic population growth has had stark ecosystem-wide effects, such as food-web shifts and de…
View article: Combined proteomic and gene expression analysis to investigate reduced performance in rainbow trout (Oncorhynchus mykiss) caused by environmentally relevant microplastic exposure
Combined proteomic and gene expression analysis to investigate reduced performance in rainbow trout (Oncorhynchus mykiss) caused by environmentally relevant microplastic exposure Open
The pollution of the environment with microplastics (MPs) is affecting aquatic organisms worldwide, and yet intensive research, has thus far failed to deliver an adequate understanding of the detrimental effects of MP ingestion by fish. In…
View article: Stickleback mass occurrence driven by spatially uneven parasite pressure? Insights into infection dynamics, host mortality, and epizootic variability
Stickleback mass occurrence driven by spatially uneven parasite pressure? Insights into infection dynamics, host mortality, and epizootic variability Open
Since 2012, a massive invasion of the three-spined stickleback ( Gasterosteus aculeatus ) has taken place into the pelagic area of Lake Constance. This species, which had previously been restricted to the littoral zone, is now the dominant…
View article: Morphometric data: Cryptic persistence and loss of local endemism in Lake Constance charr subject to anthropogenic disturbance
Morphometric data: Cryptic persistence and loss of local endemism in Lake Constance charr subject to anthropogenic disturbance Open
In the welcome circumstance that species believed extinct are rediscovered, it is often the case that biological knowledge acquired before the presumed extinction is limited. Efforts to address these knowledge gaps in particular to assess …
View article: Microplastic evacuation in fish is particle size‐dependent
Microplastic evacuation in fish is particle size‐dependent Open
The pollution of aquatic systems with microplastics (MPs) affects marine and freshwater fish species worldwide. However, little is known about the size‐dependent retention time of these inert particles. To approach this question, the reten…