150 Works

XAO at LBT: current performances in the visible and upcoming upgrade

Enrico Pinna, Fernando Pedichini, Simone Esposito, Mauro Centrone, Alfio Puglisi, Jacopo Farinato, Luca Carbonaro, Guido Agapito, Marco Stangalini, Armando Riccardi, Marco Xompero, Runa Briguglio, Philip Hinz, Vanessa Bailey & Manny Montoya

Design and Development Status of MKID Integral Field Spectrographs for High Contrast Imaging

Seth Meeker, Benjamin Mazin, Rebecca Jensen-Clem, Alex Walter, Paul Szypryt, Matthew Strader & Clint Bockstiegel

First Results of the Ground Layer Adaptive Optics System ARGOS

Gilles Orban De Xivry, Marco Bonaglia, Jose Borelli, Lorenzo Busoni, Matthias Deysenroth, Simone Esposito, Wolfgang Gaessler, Martin Kulas, Tommaso Mazzoni, Diethard Peter, Sebastian Rabien, Gustavo Rahmer, Julian Ziegleder, Alexander Sivitilli, Jesper Storm, Hans Gemperlein, Michael Lefebvre, Alfio Puglisi & Walfried Raab

Use of Laser Guide Star with Pyramid Wavefront Sensor

Celia Blain, Simone Esposito, Alfio Puglisi, Guido Agapito & Enrico Pinna

Prototyping the GMT phasing camera with the Magellan AO system

Derek Kopek, Brian McLeod, Kenneth McCracken, Marcos Van Dam, Antonin Bouchez, Alan Conder, William Podgorski, Daniel Catropa, Stuart McMuldroch, Laird Close, Jared Males, Katie Morzinski & Timothy Norton

PSF reconstruction for AO photometry and astrometry

Joana Ascenso, Benoit Neichel, Manuel Silva, Thierry Fusco & Paulo Garcia

The Global Value of Mangroves for Risk Reduction Technical Report

Íñigo J. Losada, Pelayo Menéndez, Antonio Espejo, Saúl Torres, Pedro Díaz Simal, Sheila Abad, Michael W. Beck, Siddharth Narayan, Dania Trespalacios, Kerstin Pfliegner, Peter Mucke & Lotte Kirch

Understanding forest dynamics by integrating age and environmental change

Kai Zhu
How much carbon a forest ecosystem can sequester is determined by both post-disturbance regrowth and environmentally modified growth. Disturbance causes sharp declines in the short term and is followed by regrowth in the long term. Environmental change may alter carbon accumulation through increasing CO2, nitrogen deposition, and climate change. Regrowth and modified growth occur simultaneously, yet they are usually studied separately and assessed using an additive approach. Alternatively, an interactive approach using hierarchical models can...

Sperm morphology and count vary with fine-scale changes in local density in a wild lizard population

Matthew C Kustra, Ariel F Kahrl, Aaron M Reedy, Daniel A Warner & Robert M Cox
Given that sperm production can be costly, theory predicts that males should optimally adjust the quantity and/or quality of their sperm in response to their social environment to maximize their paternity success. Although experiments demonstrate that males can alter their ejaculates in response to manipulations of the social environment and studies show that ejaculate traits covary with social environment across populations, it is unknown whether individual variation in sperm traits corresponds to natural variation found...

How climate impacts the composition of wolf killed-elk in northern Yellowstone National Park

Christopher Wilmers, Matthew Metz, Daniel Stahler, Michel Kohl, Chris Geremia & Douglas Smith
1. While the functional response of predators is commonly measured, recent work has revealed that the age and sex composition of prey killed is often a better predictor of prey population dynamics because the reproductive value of adult females is usually higher than that of males or juveniles. 2. Climate is often an important mediating factor in determining the composition of predator kills, but we currently lack a mechanistic understanding of how the multiple facets...

Data From: Ecosystem size shapes antipredator trait evolution in estuarine threespine stickleback

Ben A. Wasserman, Antoine Paccard, Travis M. Apgar, Simone Des Roches, Rowan D.H. Barrett, Andrew P. Hendry & Eric P. Palkovacs
Ecosystem size is known to influence both community structure and ecosystem processes. Less is known about the evolutionary consequences of ecosystem size. A few studies have shown that ecosystem size shapes the evolution of trophic diversity by shaping habitat heterogeneity, but the effects of ecosystem size on antipredator trait evolution have not been explored. Ecosystem size may impact antipredator trait evolution by shaping predator presence (larger ecosystems have longer food chains) and habitat complexity (larger...

Monitoring data from a managed aquifer recharge system that collects stormwater runoff in central coastal California. Precipitation, runoff, infiltration, sediment, survey

Sarah Beganskas & Andrew Fisher
Groundwater is increasingly important for satisfying California’s growing fresh water demand. Strategies like managed aquifer recharge (MAR) can improve groundwater supplies, mitigating the negative consequences of persistent groundwater overdraft. Distributed stormwater collection (DSC) MAR projects collect and infiltrate excess hillslope runoff before it reaches a stream, focusing on 40–400 ha drainage areas (100–1000 ac). We present results from six years of DSC–MAR operation—including high resolution analyses of precipitation, runoff generation, infiltration, and sediment transport—and discuss...

Supporting data for Loik et al. 2017 Wavelength-Selective Solar Photovoltaic Systems: Powering greenhouses for plant growth at the food-energy-water nexus. Earth's Future

Michael Loik
Global renewable electricity generation capacity has rapidly increased in the past decade. Increasing the sustainability of electricity generation and the market share of solar photovoltaics (PV) will require continued cost reductions or higher efficiencies. Wavelength-Selective Photovoltaics (WSPVs) combine luminescent solar cell technology with conventional Silicon-based PV, thereby increasing efficiency and lowering the cost of electricity generation. WSPVs absorb some of the blue and green wavelengths of the solar spectrum but transmit the remaining wavelengths that...

Hydrology, geochemistry, and microbiology data from meter-scale infiltration experiments exploring the impact of a woodchip soil amendment on nitrate removal during infiltration

Sarah Beganskas, Galen Gorski, Tess Weathers, Andrew Fisher, Calla Schmidt, Chad Saltikov, Kaitlyn Redford, Brendon Stoneburner, Ryan Harmon & Walker Weir
We present results from field experiments linking hydrology, geochemistry, and microbiology during infiltration at a field site that is used for managed aquifer recharge (MAR). These experiments measured how a horizontal permeable reactive barrier (PRB) made of woodchips impacted subsurface nitrate removal and microbial ecology. Concentrations of dissolved organic carbon consistently increased in infiltrating water below the PRB, but not in un-amended native soil. The average nitrate removal rate in soils below the PRB was...

Female Breeding Histories at Año Nuevo

R Condit, Joanne Reiter, Patricia Morris & Burney Le Boeuf
The elephant seal (Mirounga angustirostris) breeding colony at Año Nuevo, California, was founded in 1961, and since monitored closely until the present. Since 1968 a research group at the University of California, Santa Cruz, has studied it in detail. Individually identified females were monitored during the breeding season, and pupping records of many throughout their lifetimes were assembled. We address here the maximum reproductive success of females using the lifetime breeding histories. Females lived to...

Interspecific and intra-shell stable isotope variation among the Red Sea giant clams

Daniel Killam, Ryan Thomas, Matthew Clapham & Tariq Al-Najjar
The Gulf of Aqaba is home to three giant clam species with differing ecological niches and levels of photosymbiotic activity. Giant clams grow a two-layered shell where the outer layer is precipitated in close association with photosymbiont-bearing siphonal mantle, and the inner layer is grown in association with the light-starved inner mantle. We collected 38 shells of the three species (the cosmopolitan Tridacna maxima and T. squamosa, as well as the rare endemic T. squamosina),...

The case of an arctic wild ass highlights the utility of ancient DNA for validating problematic identifications in museum collections

Alisa Vershinina, Joshua D. Kapp, Gennady Baryshnikov & Beth Shapiro
Museum collections are essential for reconstructing and understanding past biodiversity. Many museum specimens are, however, challenging to identify. Museum samples may be incomplete, have an unusual morphology, or represent juvenile individuals, all of which complicate accurate identification. In some cases, inaccurate identification can lead to false biogeographic reconstructions with cascading impacts on paleontological and paleoecological research. Here we analyze an unusual Equid mandible found in the Far North of the Taymyr peninsula that was identified...

The role of bioturbation-driven substrate disturbance in the Mesozoic brachiopod decline

Matthew Clapham & Marko Manojlovic
Brachiopods dominated the seafloor as a primary member of the Paleozoic fauna. Despite the devastating effects of the end-Permian extinction, the group recovered during the early Mesozoic only to gradually decline from the Jurassic to today. This decline likely had multiple causes, including increased predation and bioturbation-driven substrate disruption, but the role of changing substrate is not well understood. Given the importance of substrate for extant brachiopod habitat, we documented Mesozoic-Cenozoic lithological preferences and morphological...

Low Wind Effect, the main limitation of the SPHERE instrument

Jean-François Sauvage, Thierry Fusco, Andres Guesalaga, Peter Wizinowitch, Jared O'Neal, Mamadou N'Diaye, Arthur Vigan, Julien Grard, Geoffroy Lesur, David Mouillet, Jean-Luc Beuzit, Markus Kasper, Miska Le Louarn, Julien Milli, Kjetil Dohlen, Benoit Neichel, Pierre Bourget, Pierre Heigenauer & Dimitri Mawet

MCAO numerical simulations for EST: analysis and parameter optimization

Luzma Montoya, Iciar Montilla & Manuel Collados

The use of CPU, GPU and FPGA in real-time control of adaptive optics systems

Luis Fernando Rodríguez Ramos, Jose Javier Diaz Garcia, Juan Jose Fernández Valdivia, Haresh Chulani, Carlos Colodro-Conde & Jose Manuel Rodriguez Ramos

E-ELT M4 Unit updated design and prototype results

Roberto Biasi, Daniele Gallieni, Runa Briguglio, Elise Vernet, Mario Andrighettoni, Gerald Angerer, Dietrich Pescoller, Mauro Manetti, Matteo Tintori, Marco Mantegazza, Paolo Lazzarini, Pierluigi Fumi, Vincenzo Anaclerio, Marco Xompero, Giorgio Pariani, Armando Riccardi, Marc Cayrel, Philippe Dierickx, Norbert Hubin, Nick Kornweibel & Lorenzo Pettazzi

Laser Pointing Camera: a valuable tool for the LGS-AO operations

Mauro Centrone, Domenico Bonaccini Calia, Fernando Pedichini, Antonio Cerruto, Andrea Ricciardi & Filippo Ambrosino

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  • University of California, Santa Cruz
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  • Technical University of Berlin
  • Colorado School of Mines
  • Delaware Museum of Natural History
  • University of Montana
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  • Utah State University
  • Northern Illinois University