8 Works

Non-native plant removal and high rainfall years promote post-fire recovery of Artemisia californica in southern California sage scrub

Diane Thomson &
Non-native plant invasions, changes in fire regime, and increasing drought stress all pose important threats to biodiverse mediterranean-climate shrublands. These factors can also interact, with fire and drought potentially creating opportunities for non-native species to establish dominance before native shrubs recover. We carried out post-fire demographic monitoring of the common native shrub Artemisia californica in a southern California sage scrub fragment for 7 years, including several with very low rainfall. Experimental removals of non-native plants...

Data from: A large new leanchoiliid from the Burgess Shale and the influence of inapplicable states on stem arthropod phylogeny

Cédric Aria, Jean-Bernard Caron & Robert Gaines
Characterized by atypical frontalmost appendages, leanchoiliids are early arthropods whose phylogenetic placement has been much debated. Morphological interpretations have differed, some of which concern critical characters such as the number of eyes and head appendages, but methodological approaches also have diverged. Here, we describe a new leanchoiliid, Yawunik kootenayi gen. et sp. nov., based on 42 specimens from the newly discovered Marble Canyon locality of the Burgess Shale (Kootenay National Park, British Columbia; middle Cambrian)....

Twitter data reveal six distinct environmental personas

Charlotte Chang, Paul Armsworth & Yuta Masuda
Effective digital environmental communication is integral to galvanizing public support for conservation in the age of social media. Environmental advocates require messaging strategies suited to social media platforms, including ways to identify, target, and mobilize distinct audiences. Here, we provide – to the best of our knowledge – the first systematic characterization of environmental personas on social media. Beginning with 1 million environmental nongovernmental organization (NGO) followers on Twitter, of which 500,000 users met data...

Data set: The origin of sex differences in song in a tropical duetting wren

Rachel Levin, Rachel Levin, Tanya Paris & Janet Bester-Meredith
The study of song development has focused on temperate zone birds in which typically only males sing. In the bay wren, Cantorchilus nigricapillus, both sexes sing, performing precisely timed, female-initiated duets in which birds alternate sex-specific song phrases. We investigated the origin of these sex differences by collecting bay wren eggs and nestlings and hand-raising them in individual acoustic isolation chambers. Each bird was tutored with either monophonic or stereophonic recordings of bay wren duets,...

Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting

Burton Jones
The marine biological pump is one of the primary pathways via which anthropogenic carbon dioxide may be sequestered from the atmosphere and exported to the deep ocean as organic carbon. While the link between nutrient supply and high primary productivity in upwelling regions is well established, factors controlling the organic carbon export efficiency of upwelling ecosystems are not well known. Scientists from the University of Southern California and Pomona College plan to determine the factors...

Data from: The extracellular and cytoplasmic domains of Syndecan cooperate postsynaptically to promote synapse growth at the Drosophila neuromuscular junction

Margaret U. Nguyen, Jereen Kwong, Julia Chang, Victoria G. Gillet, Rachel M. Lee & Karl Gregory Johnson
The heparan sulfate proteoglycan (HSPG) Syndecan (Sdc) is a crucial regulator of synapse development and growth in both vertebrates and invertebrates. In Drosophila, Sdc binds via its extracellular heparan sulfate (HS) sidechains to the receptor protein tyrosine phosphatase LAR to promote the morphological growth of the neuromuscular junction (NMJ). To date, however, little else is known about the molecular mechanisms by which Sdc functions to promote synapse growth. Here we show that all detectable Sdc...

The Burgess Shale paleocommunity with new insights from Marble Canyon, British Columbia

Karma Nanglu, Jean-Bernard Caron & Robert Gaines
The middle (Wuliuan Stage) Cambrian Burgess Shale is famous for its exceptional preservation of diverse and abundant soft-bodied animals through the “thick” Stephen Formation. However, with the exception of the Walcott Quarry (Fossil Ridge) and the stratigraphically older Tulip Beds (Mount Stephen) which are both in Yoho National Park (British Columbia), quantitative assessments of the Burgess Shale have remained limited. Here we first provide a detailed quantitative overview of the diversity and structure of the...

Understanding the fate of shrimp aquaculture effluent in a mangrove ecosystem: aiding management for coastal conservation

Kathryn Hargan, Branwen Williams, Bunlung Nuangsaeng, Sarawut Siriwong, Pisut Tassawad, Chatdanai Chaiharn, Brian Mcadoo & Marc Los Huertos
1. Areas dedicated to shrimp aquaculture have increased dramatically over the last 50 years. Resultant land-use changes directly threaten the extent of mangroves and yield conflicts on the discharge location of aquaculture effluent. 2. Khung Krabaen Bay (KBB), Thailand, is reforesting mangroves while increasing the efficiency of shrimp aquaculture for local farmers. In this coupled shrimp farm-mangrove system, effective management requires understanding the fate of aquaculture organic matter (OM) in the coastal environment. 3. We...

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