79 Works

Aus der Vogelperspektive. Drohnen in der Vulkanforschung

Karen Strehlow
Forschungsdrohnen ermöglichen einen völlig neuen Blick auf aktive Vulkane. Mit ihnen sind schnell hochauflösende Bilder direkt aus dem Krater und auch Daten aus anderen bisher unerreichbaren Zonen eines Vulkans zu beschaffen. Zugleich minimiert der Einsatz von Drohnen die Gefahren für Wissenschaftlerinnen und Wissenschaftler.

Seltenes Naturphänomen: Lavaseen

Jana Kandarr
Lavaseen sind eine absolute Seltenheit auf der Erde. An nur sieben Orten der Welt treten diese eindrucksvollen Naturphänomene aktuell in Erscheinung. * Lavaseen bilden sich stets über aktiven Vulkanschloten. * Ein Lavasee ist ständig in Bewegung. In der Regel kann in ihm ein horizontales Fließen wahrgenommen werden. * In stabilen, aktiven Lavaseen müssen in unterirdischen Systemen Mechanismen existieren, die zu einer permanenten Gasanreicherung führen.

Die unbekannte Welt von Unterwasser-Vulkanen

Karen Strehlow & Philipp Brandl
Die meisten Vulkanausbrüche finden dort statt, wo wir sie nur schwer beobachten können: unter Wasser. Ein kleiner Einblick in die noch junge Forschungsdisziplin der Erkundung submariner Vulkane.

Data from: Microsatellites reveal origin and genetic diversity of Eurasian invasions by one of the world's most notorious marine invader, Mnemiopsis leidyi (Ctenophora)

Thorsten Reusch, Sören Bolte, Maximiliane Sparwel, Anthony Moss & Jamileh Javidpour
Marine invasions take place at an increasing rate. When occurring in blooms, zooplanktivorous comb jellies of the genus Mnemiopsis are able to cause pelagic regime shifts in coastal areas, and may cause the collapse of commercially important fish populations. Using microsatellites, developed for the first time in the phylum Ctenophora, we show that Mnemiopsis leidyi has colonized Eurasia from two source regions. Our preliminary data set included 4 sites within the putative source region (US...

Data from: An inverse latitudinal gradient in speciation rate for marine fishes

Daniel L. Rabosky, Jonathan Chang, Pascal O. Title, Peter F. Cowman, Lauren Sallan, Matt Friedman, Kristin Kaschner, Cristina Garilao, Thomas J. Near, Marta Coll & Michael E. Alfaro
Far more species of organisms are found in the tropics than in temperate and polar regions, but the evolutionary and ecological causes of this pattern remain controversial1,2. Tropical marine fish communities are much more diverse than cold-water fish communities found at higher latitudes3,4, and several explanations for this latitudinal diversity gradient propose that warm reef environments serve as evolutionary ‘hotspots’ for species formation5,6,7,8. Here we test the relationship between latitude, species richness and speciation rate...

Data from: Population genomics of local adaptation versus speciation in coral reef fishes (Hypoplectrus spp, Serranidae)

Sophie Picq, Owen McMillan, Oscar Puebla & W. Owen McMillan
Are the population genomic patterns underlying local adaptation and the early stages of speciation similar? Addressing this question requires a system in which i. local adaptation and the early stages of speciation can be clearly identified and distinguished, ii. the amount of genetic divergence driven by the two processes is similar, and iii. comparisons can be repeated both taxonomically (for local adaptation) and geographically (for speciation). Here, we report just such a situation in the...

Data from: The influence of balanced and imbalanced resource supply on biodiversity-functioning relationship across ecosystems

Aleksandra M. Lewandowska, Antje Biermann, Elizabeth T. Borer, Miguel A. Cebrian-Piqueras, Steven A. J. Declerck, Luc De Meester, Ellen Van Donk, Lars Gamfeldt, Daniel S. Gruner, Nicole Hagenah, W. Stanley Harpole, Kevin P. Kirkman, Christopher A. Klausmeier, Michael Kleyer, Johannes M. H. Knops, Pieter Lemmens, Eric M. Lind, Elena Litchman, Jasmin Mantilla-Contreras, Koen Martens, Sandra Meier, Vanessa Minden, Joslin L. Moore, Harry Olde Venterink, Eric W. Seabloom … & Helmut Hillebrand
Numerous studies show that increasing species richness leads to higher ecosystem productivity. This effect is often attributed to more efficient portioning of multiple resources in communities with higher numbers of competing species, indicating the role of resource supply and stoichiometry for biodiversity–ecosystem functioning relationships. Here, we merged theory on ecological stoichiometry with a framework of biodiversity–ecosystem functioning to understand how resource use transfers into primary production. We applied a structural equation model to define patterns...

Data from: Genetic identification of source and likely vector of a widespread marine invader

Stacy A. Krueger-Hadfield, Nicole M. Kollars, Allan E. Strand, James E. Byers, Sarah J. Shainker, Ryuta Terada, Thomas W. Greig, Marieke Hammann, David C. Murray, Florian Weinberger & Erik E. Sotka
The identification of native sources and vectors of introduced species informs its ecological and evolutionary history and may guide policies that seek to prevent future introductions. Population genetics represents a powerful set of tools to identify origins and vectors, but can mislead when the native range is poorly sampled or few molecular markers are used. Here, we traced the introduction of the Asian seaweed Gracilaria vermiculophylla (Rhodophyta) into estuaries in coastal western North America, the...

Data from: Inter-chromosomal coupling between vision and pigmentation genes during genomic divergence

Kosmas Hench, Marta Vargas, Marc P. Höppner, W. Owen McMillan & Oscar Puebla
Recombination between loci underlying mate choice and ecological traits is a major evolutionary force acting against speciation with gene flow. The evolution of linkage disequilibrium between such loci is therefore a fundamental step in the origin of species. Here, we show that this process can take place in the absence of physical linkage in hamlets—a group of closely related reef fishes from the wider Caribbean that differ essentially in colour pattern and are reproductively isolated...

Data from: Phylogeographic differentiation versus transcriptomic adaptation to warm temperatures in Zostera marina, a globally important seagrass

Alexander Jueterbock, Susanne U. Franssen, Nina Bergmann, Jenny Gu, James A. Coyer, Thorsten B. H. Reusch, Erich Bornberg-Bauer & Jeanine L. Olsen
Populations distributed across a broad thermal cline are instrumental in addressing adaptation to increasing temperatures under global warming. Using a space-for-time substitution design, we tested for parallel adaptation to warm temperatures along two independent thermal clines in Zostera marina, the most widely distributed seagrass in the temperate Northern Hemisphere. A North–South pair of populations was sampled along the European and North American coasts and exposed to a simulated heatwave in a common-garden mesocosm. Transcriptomic responses...

Strategien zur Renaturierung von Abbaugebieten

Felix Janssen, Thomas Soltwedel & Matthias Haeckel
Mehr als 100.000 verschiedene Arten in den Ozeanen sind mittlerweile bekannt, die biologische Vielfalt ist jedoch noch weit größer und viele Arten noch nicht entdeckt. Gerade in der Tiefsee stößt man bei jeder Probenentnahme auf weitere unbekannte Arten. Belastbare Aussagen zu einer potentiellen Wiederbesiedelung abgebauter und gestörter Flächen können nur auf der Basis intensiver wissenschaftlicher Untersuchungen getroffen werden.

Regeln für den Abbau. Die Verfassung der Meere und die Internationale Meeresbodenbehörde IMB. Interview

Sven Petersen
Ein tragfähiges internationales Regelwerk, noch bevor der Run auf einen Rohstoff beginnt? Dies wäre ein Novum in der Menschheit. Die ‚United Nations Convention on the Law of the Sea‘ hat sich genau das zum Ziel gesetzt. Sie beschreibt die Hohe See mit ihren Ressourcen als gemeinsames Erbe der Menschheit. Über die Nutzung der Rohstoffe am Meeresboden wacht die Internationale Meeres­boden­behörde der Vereinten Nationen (IMB). Sie ist für alle mineralischen Ressourcen am Meeresboden zuständig. Wie funktioniert...

Wirtschaftlich interessante Gebiete, wo suchen?

Sven Petersen
Manganknollen im östlichen Pazifik, kobaltreiche Eisen-Mangan-Krusten an Vulkanhängen, Massivsulfide an Spreizungszonen – in der Tiefsee gibt es unterschiedliche Gebiete, die sich für den Rohstoffabbau eignen. Manche gehören zu den ältesten Ozeangebieten der Welt. Andere hingegen sind geologisch sehr jung.

Crust and upper mantle structure of the Ligurian Sea revealed by ambient noise tomography and receiver function analysis

Felix Noah Wolf , Dietrich Lange , Heidrun Kopp , Anke Dannowski , Ingo Grevemeyer , Wayne Crawford , Martin Thorwart , Anne Paul &
GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany (1); Kiel University (2); Institut de physique du globe de Paris, Paris, France (3); ISTerre - Institut des Sciences de la Terre, Grenoble, France (4); AlpArray Working Group: http://www.alparray.ethz.ch (5);

The Liguro-Provencal-basin was formed as a back-arc basin of the retreating Calabrian-Apennines subduction zone during the Oligocene and Miocene. The resulting rotation of the Corsica-Sardinia block is associated with rifting, shaping the Ligurian Sea. It...

Maternal provisioning of the microbiome: Egg constituent and life-history character?

Tyler Carrier & Justin McAlister
Mothers impact the survival and performance of their offspring through the resources they are provisioned and, for organisms that lack parental care, the degree of maternal investment can be broadly estimated by egg size. Animals also actively maintaining symbiotic partnerships with microorganisms via the female germ line, but whether microbes are a fundamental component of maternal provisioning is an untested hypothesis in evolutionary symbiosis. We test this by comparing the egg-associated microbiota of ten sea...

Data from: Hosts are ahead in a marine host-parasite coevolutionary arms race: innate immune system adaptation in pipefish Syngnathus typhle against Vibrio phylotypes

Olivia Roth, Isabel Keller, Susanne H. Landis, Walter Salzburger & Thorsten B. H. Reusch
Microparasites have a higher evolutionary potential than their hosts due to an increased mutation rate and a shorter generation time which usually results in parasites being locally adapted to their sympatric hosts. This pattern may not apply to generalist pathogens as adaptation to sympatric host genotypes is disadvantageous due to a narrowing of the host range, in particular under strong gene flow among host populations. Under this scenario, we predict that the immune defence of...

Data from: Oxygen depletion in coastal seas and the effective spawning stock biomass of an exploited fish species

Hans-Harald Hinrichsen, Burkhard Dewitz, Jan Dierking, Holger Haslob, Andrejs Makarcuks, Christoph Petereit, Rudi Voss & H.-H. Hinrichsen
Environmental conditions may have previously underappreciated effects on the reproductive processes of commercially exploited fish populations, for example eastern Baltic cod, that are living at the physiological limits of their distribution. In the Baltic Sea, salinity affects neutral egg buoyancy, which is positively correlated with egg survival, as only water layers away from the oxygen consumption-dominated sea bottom contain sufficient oxygen. Egg buoyancy is positively correlated to female spawner age/size. From observations in the Baltic...

Data from: Recombination in the eggs and sperm in a simultaneously hermaphroditic vertebrate

Loukas Theodosiou, W. O. McMillan & Oscar Puebla
When there is no recombination (achiasmy) in one sex, it is in the heterogametic one. This observation is so consistent that it constitutes one of the few patterns in biology that may be regarded as a ‘rule’ and Haldane (Haldane 1922 J. Genet. 12, 101–109. (doi:10.1007/BF02983075)) proposed that it might be driven by selection against recombination in the sex chromosomes. Yet differences in recombination rates between the sexes (heterochiasmy) have also been reported in hermaphroditic...

Data from: Ancient DNA reveals the Arctic origin of Viking Age cod from Haithabu, Germany

Bastiaan Star, Sanne Boessenkool, Agata T. Gondek, Elena A. Nikulina, Anne Karin Hufthammer, Christophe Pampoelie, Halvor Knutsen, Carl Andre, Heidi M. Nistelberger, Jan Dierking, Christoph Petereit, Dirk Heinrich, Kjetill S. Jakobsen, Nils Chr. Stenseth, Sissel Jentoft & James H. Barrett
Knowledge of the range and chronology of historic trade and long-distance transport of natural resources is essential for determining the impacts of past human activities on marine environments. However, the specific biological sources of imported fauna are often difficult to identify, in particular if species have a wide spatial distribution and lack clear osteological or isotopic differentiation between populations. Here, we report that ancient fish-bone remains, despite being porous, brittle, and light, provide an excellent...

Data from: Selection for life-history traits to maximize population growth in an invasive marine species

Cornelia Jaspers, Lise Marty & Thomas Kiørboe
Species establishing outside their natural range, negatively impacting local ecosystems, are of increasing global concern. They often display life-history features characteristic for r-selected populations with fast growth and high reproduction rates to achieve positive population growth rates (r) in invaded habitats. Here, we demonstrate substantially earlier maturation at a 2 orders of magnitude lower body mass at first reproduction in invasive compared to native populations of the comb jelly Mnemiopsis leidyi. Empirical results are corroborated...

Data from: Microbial ‘gardening’ by a seaweed holobiont: surface metabolites attract protective and deter pathogenic epibacterial settlement

Mahasweta Saha & Florian Weinberger
1. Epimicrobial communities on seaweed surfaces usually contain not only potentially pathogenic, but also potentially beneficial microorganisms. Capacity of terrestrial plants for chemically mediated recruitment i.e. ‘gardening’ of bacterial communities in the rhizosphere was recently demonstrated. Empirical evidence directly linking such chemical ‘gardening’ with the beneficial role of gardened microbes in terrestrial plants is rare and largely missing for aquatic macrophytes. 2. Here we demonstrate that our model invasive seaweed holobiont Agarophyton vermiculophyllum possesses beneficial...

Data from: The evolution of microendemism in a reef fish (Hypoplectrus maya)

Benjamin M. Moran, Kosmas Hench, Robin S. Waples, Marc P. Höppner, Carole C. Baldwin, W. Owen McMillan & Oscar Puebla
Marine species tend to have extensive distributions, which are commonly attributed to the dispersal potential provided by planktonic larvae and the rarity of absolute barriers to dispersal in the ocean. Under this paradigm, the occurrence of marine microendemism without geographic isolation in species with planktonic larvae poses a dilemma. The recently described Maya hamlet (Hypoplectrus maya, Serranidae) is exactly such a case, being endemic to a 50-km segment of the Mesoamerican Barrier Reef System (MBRS)....

Data from: Non-native species spread in a complex network: the interaction of global transport and local population dynamics determines invasion success

Hanno Seebens, Elizabeta Briski, Sara Ghabooli, Tamara Shiganova, Hugh MacIsaac & Bernd Blasius
The number of released individuals, which is a component of propagule pressure, is considered to be a major driver for the establishment success of non-native species. However, propagule pressure is often assumed to result from single or few release events, which does not necessarily apply to the frequent releases of invertebrates or other taxa through global transport. For instance, the high intensity of global shipping may result in frequent releases of large numbers of individuals,...

Data from: Spatial contraction of demersal fish populations in a large marine ecosystem

Alessandro Orio, Ulf Bergström, Ann-Britt Florin, Andreas Lehmann, Ivo Šics & Michele Casini
Aim: The interdependencies between trophic interactions, environmental factors and anthropogenic forcing determine how species distributions change over time. Large changes in species distributions have occurred as a result of climate change. The objective of this study was to analyse how the spatial distribution of cod and flounder have changed in the Baltic Sea during the past four decades characterized by large hydrological changes. Location: Baltic Sea Taxon: Cod (Gadus morhua) and flounder (Platichthys flesus) Methods:...

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