24 Works

Triarylborane Catalyzed Alkenylation Reactions of Aryl Esters with Diazo-Compounds - dataset

Ayan Dasgupta, Katarina Stefkova, Rasool Babaahmadi, Lukas Gierlichs, Alireza Ariafard & Rebecca L Melen
Herein we report a facile, mild reaction protocol to form carbon-carbon bonds in the absence of transition metal catalysts. We demonstrate the metal-free alkenylation reactions of aryl esters with α-diazoesters to give highly functionalized enyne products. Catalytic amounts of tris(pentafluorophenyl)borane (10–20 mol%) are employed to afford the C=C coupled products (31 examples) in good to excellent yields (36–87%). DFT studies have been undertaken to elucidate the mechanism for this alkenylation reaction. Data includes experimental procedures,...

Data from: Retention forestry influences understory diversity and functional identity

Miranda Curzon, Christel Kern, Susan Baker, Brian Palik & Anthony D'Amato
In recent decades, a paradigm shift in forest management and associated policies has led to greater emphasis on harvest practices that retain mature, overstory trees in forest stands that would otherwise be clearcut. While it is often assumed that the maintenance of compositional and structural complexity, such as that achieved through retention forestry approaches, will also mitigate negative impacts to functional diversity, empirical evidence of this relationship is sparse. We examined the effects of an...

Data from: Disease swamps molecular signatures of genetic-environmental associations to abiotic factors in Tasmanian devil (Sarcophilus harrisii) populations

Alexandra Kaye Fraik, Mark Margres, Brendan Epstein, Soraia Barbosa, Menna Jones, Sarah Hendricks, Barbara Schonfeld, Amanda R. Stahlke, Anne Veillet, Rodrigo Hamede, Hamish McCallum, Elisa Lopez-Contreras, Samantha J Kallinen, Paul A Hohenlohe, Joanna Kelley & Andrew Storfer
Landscape genomics studies focus on identifying candidate genes under selection via spatial variation in abiotic environmental variables, but rarely by biotic factors such as disease. The Tasmanian devil (Sarcophilus harrisii) is found only on the environmentally heterogeneous island of Tasmania and is threatened with extinction by a nearly 100% fatal, transmissible cancer, devil facial tumor disease (DFTD). Devils persist in regions of long-term infection despite epidemiological model predictions of species’ extinction, suggesting possible adaptation to...

Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination

Peta Hill, Erik Wapstra, Tariq Ezaz & Christopher Burridge
Polymorphisms can lead to speciation if there is differential mating success among conspecifics divergent for a trait. Polymorphism for sex determining system might be particularly expected to isolate gene pools, given strong selection for the production of viable males and females and the low success of heterogametic hybrids when sex chromosomes differ (Haldane’s rule). We investigated this question using a rare example of a species exhibiting polymorphism for sex determination: the viviparous snow skink Carinascincus...

A catastrophic tropical drought kills hydraulically vulnerable tree species

Jennifer Powers, German Vargas-G, Timothy Brodribb, Naomi Schwartz, Daniel Perez-Aviles, Chris Smith-Martin, Justin Becknell, Filippo Aureli, Roger Blanco, Erick Calderón-Morales, Julio César Calvo-Alvarado, Ana Julieta Calvo-Obando, María Marta Chavarría, Dorian Carvajal-Vanegas, César Dionisio Jiménez-Rodríguez, Evin Murillo Chacon, Colleen Schaffner, Leland Werden, Xiangtao Xu & David Medvigy
Drought-related tree mortality is now a widespread phenomenon predicted to increase in magnitude with climate change. However, the patterns of which species and trees are most vulnerable to drought, and the underlying mechanisms have remained elusive, in part due to the lack of relevant data and difficulty of predicting the location of catastrophic drought years in advance. We used long‐term demographic records and extensive databases of functional traits and distribution patterns to understand the responses...

Data from: Does migration promote or inhibit diversification? A case study involving the dominant radiation of temperate Southern Hemisphere freshwater fishes

Christopher Burridge & Jonathan M. Waters
While theory predicts that dispersal is a pivotal influence on speciation and extinction rates, it can have contradictory effects on each, such that empirical studies are needed to quantify its role. In many studies, dispersal reduction appears to promote diversification, although some analyses of migratory species suggest otherwise. Here we test for a relationship between migratory status and diversification rate within the dominant radiation of temperate Southern Hemisphere freshwater fishes, the Galaxiidae. We reconstructed a...

Data from: Greater agility increases probability of survival in the endangered northern quoll

Miranda Rew-Duffy, Skye Cameron, Natalie Freeman, Rebecca Wheatley, Jessica Latimer & Robbie Wilson
Introduced predators combined with habitat loss and modification are threatening biodiversity worldwide, particularly the ‘critical weight range’ (CWR) mammals of Australia. In order to mitigate the impacts of invasive predators on native species in different landscapes, we must understand how the prey's morphology and performance determine their survival. Here we evaluate how phenotypic traits related to escape performance predict the probability of survival for an endangered CWR mammal, the northern quoll (Dasyurus hallucatus). We measured...

rhinoceros auklet microsatellite data

Theresa Burg, Marie Prill, Katharine Studholme, Alice Domalik, Strahan Tucker, Catherine Jardine, Mark Maftei, Kenneth Wright, Jesse Beck, Russell Bradley, Ryan Carle, Thomas Good, Scott Hatch, Peter Hodum, Motohiro Ito, Scott Pearson, Nora Rojek, Leslie Slater, Yutaka Watanuki, Alexis Will, Aidan Bindoff, Glenn Crossin, Mark Drever & Mark Hipfner
We tested the hypothesis that segregation in wintering areas promotes population differentiation in a sentinel North Pacific seabird, the rhinoceros auklet (Cerorhinca monocerata). We collected tissue samples for genetic analyses on five breeding colonies in the western Pacific Ocean (Japan) and 13 in the eastern Pacific Ocean (California to Alaska), and deployed light-level geologgers on 12 eastern Pacific colonies to delineate wintering areas. Loggers were deployed previously on one colony in Japan. There was strong...

Borane Catalyzed Stereoselective C–H insertion, Cyclopropanation, and Ring-Opening Reactions - data

Ayan Dasgupta, Rasool Babaahmadi, Ben Slater, Brian F Yates, Alireza Ariafard & Rebecca L Melen
Lewis acidic boranes have been shown to be an effective metal-free catalyst for highly selective reactions of donor-acceptor diazo compounds to a range of substrates. The reactions of α-aryl α-diazoesters with nitrogen heterocycles indole or pyrrole selectively generates C3 and C2 C–H insertion products respectively in good to excellent yields even when using unprotected indoles. Alternatively, benzofuran, indene, and alkene substrates give exclusively cyclopropanated products with α-aryl α-diazoesters, whereas the reactions with furans leads to...

Data from: Aridity drives coordinated trait shifts but not decreased trait variance across the geographic range of eight Australian trees

Leander Anderegg, Xingwen Loy, Ian Markham, Christina Elmer, Mark Hovenden, Janneke HilleRisLambers & Margaret Mayfield
Large intraspecific functional trait variation strongly impacts many aspects of communities and ecosystems, and is the medium upon which evolution works. Yet intraspecific trait variation is inconsistent and hard to predict across traits, species, and locations. We measured within-species variation in leaf mass per area (LMA), leaf dry matter content (LDMC), branch wood density (WD), and allocation to stem area vs. leaf area in branches (branch Huber value, HV) across the aridity range of seven...

Macquarie Island southern elephant seal demography

Sophia Volzke
The Southern Ocean has been disproportionately affected by climate change and is therefore an ideal place to study the influence of changing environmental conditions on ecosystems. Changes in the demography of predator populations are indicators of broader shifts in food-web structure, but long-term data are required to study these effects. Southern elephant seals (Mirounga leonina) from Macquarie Island have consistently decreased in population size while all other major populations across the Southern Ocean have recently...

Data from: Mechanisms of male-male interference during dispersal of orchid pollen

Lawrence Harder, Shane A. Richards, Jon Ågren & Steven D. Johnson
Siring success of flowering plants depends on the fates of male gametophytes, which compete for access to stigmas, stylar resources and ovules. Although rarely considered, pollen may often compete during dispersal, affecting the processes required for export to stigmas; pollen pickup, transport and deposition. We quantified dispersal interference by tracking bee dispersal of stained Anacamptis morio (Orchidaceae) pollen from individual donor flowers and inferred the affected dispersal mechanisms based on the fit of a process-based...

Integrating dynamic processes into waterfowl conservation prioritization tools

Kaylan Kemink, Vanessa Adams & Bob Pressey
Aim: Traditional approaches for including species’ distributions in conservation planning have presented them as long-term averages of variation. Like these approaches, the main waterfowl conservation targeting tool in the United States Prairie Pothole Region (US PPR) is based primarily on long-term averaged distributions of breeding pairs. While this tool has supported valuable conservation, it does not explicitly consider spatiotemporal changes in spring wetland availability and does not assess wetland availability during the brood rearing period....

Lack of vulnerability segmentation among woody species in a diverse dry sclerophyll woodland community

Chris Smith-Martin, Robert Paul Skelton, Kate Johnson, Christopher Lucani & Tim Brodribb
1. Recent findings suggest that tree mortality and post-drought recovery of gas exchange can be predicted from loss of function within the water transport system. Understanding the susceptibility of plants to hydraulic damage requires knowledge about the vulnerability of different plant organs to stress-induced hydraulic dysfunction. This is particularly important in the context of vulnerability segmentation between plant tissues which is believed to protect more energetically “costly” tissues, such as woody stems, by sacrificing “cheaper”...

Data from: Links between environment and stomatal size through evolutionary time in Proteaceae

Gregory Jordan, Raymond Carpenter, Barbara Holland, Nicholas Beeton, Michael Woodhams & Tim Brodribb
The size of plant stomata (adjustable pores that determine uptake of CO2 and loss of water from leaves) is considered to be evolutionarily important. This study uses fossils from the major southern hemisphere family Proteaceae to test whether stomatal cell size responded to Cenozoic climate change. We measured the length and abundance of guard cells (the cells forming stomata), the area of epidermal pavement cells, stomatal index and maximum stomatal conductance from a comprehensive sample...

Implications for the mesopelagic microbial gardening hypothesis as determined by experimental fragmentation of Antarctic krill faecal pellets

Emma Cavan, So Kawaguchi & Philip Boyd
1. Detritivores need to upgrade their food to increase its nutritional value. One method is to fragment detritus promoting the colonisation­ of nutrient-rich microbes, which consumers then ingest along with the detritus; so-called microbial gardening. Observations and numerical models of the detritus-dominated ocean mesopelagic zone have suggested microbial gardening by zooplankton is a fundamental process in the ocean carbon cycle leading to increased respiration of carbon-rich detritus. However, no experimental evidence exists to demonstrate that...

Data for: Infectious disease and sickness behaviour: tumour progression affects interaction patterns and social network structure in wild Tasmanian devils

David Hamilton
Infectious diseases, including transmissible cancers, can have a broad range of impacts on host behaviour, particularly in the latter stages of disease progression. However, the difficulty of early diagnoses makes the study of behavioural influences of disease in wild animals a challenging task. Tasmanian devils (Sarcophilus harrisii) are affected by a transmissible cancer, devil facial tumour disease (DFTD), in which tumours are externally visible as they progress. Using telemetry and mark-recapture data sets, we quantify...

Mountain goat molt from community photographs

Katarzyna Nowak, Shane Richards, Joel Berger, Amy Panikowski, Aerin Jacob, Donald Reid, Greg Newman, Nicholas Young & Jon Beckmann
Participatory approaches, such as community photography, can engage the public in questions of societal and scientific interest while helping advance understanding of ecological patterns and processes. We combined data extracted from community-sourced, spatially-explicit photographs with research findings from 2018 fieldwork in the Yukon, Canada, to evaluate winter coat molt patterns and phenology in mountain goats (Oreamnos americanus), a cold-adapted, alpine mammal. Leveraging the community science portals iNaturalist and CitSci, in less than a year we...

Lessons from a century of conservation translocations

Shane D Morris, Barry W Brook, Katherine E Moseby & Christopher N Johnson
Translocation—moving individuals for release in new locations—is among the most important conservation interventions for increasing or re-establishing populations of threatened species. However, translocations often fail. To improve their effectiveness, we need to understand the features that distinguish successful from failed translocations. Here, we assembled and analysed a global database of translocations of terrestrial vertebrates (n=514) to assess the effects of various design features and extrinsic factors on success. Unlike previous reviews, we analysed outcomes using...

Modelled mid-trophic pelagic prey fields improve understanding of marine predator foraging behaviour

David Green, Sophie Bestley, Rowan Trebilco, Stuart Corney, Patrick Lehodey, Clive McMahon, C. Guinet & Mark A. Hindell
Biophysical interactions are influential in determining the scale of key ecological processes within marine ecosystems. For oceanic predators, this means foraging behaviour is influenced by processes shaping the distribution of prey. However, oceanic prey is difficult to observe and its abundance and distribution is regionally generalised. We use a spatiotemporally resolved simulation model to describe mid-trophic prey distribution within the Southern Ocean and demonstrate insights that this modelled prey field provides into the foraging behaviour...

Production of mobile invertebrate communities on shallow reefs from temperate to tropical seas

Kate Fraser
Primary productivity of marine ecosystems is largely driven by broad gradients in environmental and ecological properties. In contrast, secondary productivity tends to be more variable, influenced by bottom-up (resource driven) and top-down (predatory) processes, other environmental drivers, and mediation by the physical structure of habitats. Here, we use a continental-scale dataset on small mobile invertebrates (‘epifauna’), common on surfaces in all marine ecosystems, to test influences of potential drivers of temperature-standardised secondary production across biogeographic...

Habitat features and performance interact to determine the outcomes of terrestrial predator-prey pursuits

Rebecca Wheatley, Theodore Pavlic, Ofir Levy & Robbie Wilson
1. Animals are responsive to predation risk, often seeking safer habitats at the cost of foraging rewards. Although previous research has examined how habitat features affect detection by predators, little is known about how the interaction of habitat features, sensory cues, and physical performance capabilities affect prey escape performance once detected. 2. To investigate how specific habitat features affect predation risk, we developed an individual-based model of terrestrial predator–prey pursuits in habitats with programmable features....

Conditional female strategies influence hatching success in a communally-nesting iguana

Jeanette B. Moss, Glenn P. Gerber, Tanja Laaser, Matthias Goetz, TayVanis Oyog & Mark E. Welch
The decision of females to nest communally has important consequences for reproductive success. While often associated with reduced energetic expenditure, conspecific aggregations also expose females and offspring to conspecific aggression, exploitation, and infanticide. Intrasexual competition pressures areexpected to favor the evolution of conditional strategies, which could be based on simple decision rules (i.e., availability of nesting sites, synchronicity with conspecifics) or on a focal individual’s condition or status (i.e., body size). Oviparous reptiles that reproduce...

Data from: Age-related variation in the trophic characteristics of a marsupial carnivore, the Tasmanian devil Sarcophilus harrisii

Olivia Bell, Menna E. Jones, Manuel Ruiz Aravena, Rodrigo K. Hamede-Ross, Stuart Bearhop & Robbie A. McDonald
Age-related changes in diet have implications for competitive interactions and for predator-prey dynamics, affecting individuals and groups at different life stages. To quantify patterns of variation and ontogenetic change in the diets of Tasmanian devils Sarcophilus harrisii, a threatened marsupial carnivore, we analysed variation in the stable isotope composition of whisker tissue samples taken from 91 individual devils from Wilmot, Tasmania from December 2014 to February 2017. Both δ¹³C and δ¹⁵N decreased with increasing age...

Registration Year

  • 2020
    24

Resource Types

  • Dataset
    23
  • Collection
    1

Affiliations

  • University of Tasmania
    24
  • University of Queensland
    3
  • University of Minnesota
    2
  • Cardiff University
    2
  • Harvard University
    2
  • University of Adelaide
    1
  • University of Washington
    1
  • Colby College
    1
  • Columbia University
    1
  • University of Notre Dame
    1