Tracking Public Beliefs About Anthropogenic Climate Change

A simple question about climate change, with one choice designed to match consensus statements by scientists, was asked on 35 US nationwide, single-state or regional surveys from 2010 to 2015. Analysis of these data (over 28,000 interviews) yields robust and exceptionally well replicated findings on public beliefs about anthropogenic climate change, including regional variations, change over time, demographic bases, and the interacting effects of respondent education and political views. We find that more than half of the US public accepts the scientific consensus that climate change is happening now, caused mainly by human activities. A sizable, politically opposite minority (about 30 to 40%) concede the fact of climate change, but believe it has mainly natural causes. Few (about 10 to 15%) say they believe climate is not changing, or express no opinion. The overall proportions appear relatively stable nationwide, but exhibit place-to-place variations. Detailed analysis of 21 consecutive surveys within one fairly representative state (New Hampshire) finds a mild but statistically significant rise in agreement with the scientific consensus over 2010–2015. Effects from daily temperature are detectable but minor. Hurricane Sandy, which brushed New Hampshire but caused no disaster there, shows no lasting impact on that state’s time series—suggesting that non-immediate weather disasters have limited effects. In all datasets political orientation dominates among individual-level predictors of climate beliefs, moderating the otherwise positive effects from education. Acceptance of anthropogenic climate change rises with education among Democrats and Independents, but not so among Republicans. The continuing series of surveys provides a baseline for tracking how future scientific, political, socioeconomic or climate developments impact public acceptance of the scientific consensus.     

Simultaneous Isolation of Three Different Stem Cell Populations from Murine Skin

The skin is a rich source of readily accessible stem cells. The level of plasticity afforded by these cells is becoming increasingly important as the potential of stem cells in Cell Therapy and Regenerative Medicine continues to be explored. Several protocols described single type stem cell isolation from skin; however, none of them afforded simultaneous isolation of more than one population. Herein, we describe the simultaneous isolation and characterization of three stem cell populations from the dermis and epidermis of murine skin, namely Epidermal Stem Cells (EpiSCs), Skin-derived Precursors (SKPs) and Mesenchymal Stem Cells (MSCs). The simultaneous isolation was possible through a simple protocol based on culture selection techniques. These cell populations are shown to be capable of generating chondrocytes, adipocytes, osteocytes, terminally differentiated keratinocytes, neurons and glia, rendering this protocol suitable for the isolation of cells for tissue replenishment and cell based therapies. The advantages of this procedure are far-reaching since the skin is not only the largest organ in the body, but also provides an easily accessible source of stem cells for autologous graft.     

Practitioner versus participant perspectives on conservation tenders

Extensive clearing of native vegetation on rural properties throughout Australia over the last century has generated significant damage to biodiversity. Conservation tenders have been broadly used to reduce the detrimental impact of such widespread clearance. To date, Australian conservation tender research has largely been limited to program evaluations and landholder surveys. This analysis differs by comparing and contrasting the views of non-landholders involved with these programs with those of participant landholders. The non-landholder group consists of individuals with involvement in conservation tenders across Australia. By contrast, the landholder group consists of individuals with participation experience in a series of Victorian tender initiatives. Each group is surveyed to investigate the drivers of cost-effectiveness within tender programs and landholder participation. This analysis explores these two perspectives, revealing important convergences and divergences in opinion. Both practitioners and landholders indicate that programs supported by close agency–landholder relationships and offering flexibility to landholders are most likely to succeed, particularly where landholders perceive the tender instrument to be fair. Whilst practitioners emphasise the role of transaction costs issues and program characteristics in achieving cost-effective biodiversity outcomes, landholders indicate that these factors are less important to participation rates. This research is important to guide future implementation of tender programs both in Australia and internationally.     

From types to individuals: Hennig’s ontology and the development of phylogenetic systematics

Contemporary phylogenetic systematics was framed, in part, as a response to a resurgent idealistic morphology in the German‐speaking world in the first half of the 20th century. There were also conceptual and methodological challenges from Anglo‐American researchers who were sceptical about whether a phylogenetic approach to systematics could be made to work. This paper describes these challenges as a way of providing context for some ontological innovations made first by Walter Zimmermann and then by Willi Hennig. The principal argument of this paper is that what has become known as the individuality thesis played a much more important role in the conceptual foundations of Hennig’s version of phylogenetic systematics than has been widely appreciated. Understanding Hennig’s ontology illuminates his responses to objections to phylogenetic systematics from both sides of the Atlantic and sheds substantial light on the extinction part of the dichotomy rule. Although many have taken Hennig’s claim that parent species go extinct at speciation to be an arbitrary and biologically unrealistic rule, extinction of the parent follows directly from the way Hennig understands species and how they are individuated. © The Willi Hennig Society 2011.     

Signatures of seaway closures and founder dispersal in the phylogeny of a circumglobally distributed seahorse lineage

Background  

The importance of vicariance events on the establishment of phylogeographic patterns in the marine environment is well documented, and generally accepted as an important cause of cladogenesis. Founder dispersal (i.e. long-distance dispersal followed by founder effect speciation) is also frequently invoked as a cause of genetic divergence among lineages, but its role has long been challenged by vicariance biogeographers. Founder dispersal is likely to be common in species that colonize remote habitats by means of rafting (e.g. seahorses), as long-distance dispersal events are likely to be rare and subsequent additional recruitment from the source habitat is unlikely. In the present study, the relative importance of vicariance and founder dispersal as causes of cladogenesis in a circumglobally distributed seahorse lineage was investigated using molecular dating. A phylogeny was reconstructed using sequence data from mitochondrial and nuclear markers, and the well-documented closure of the Central American seaway was used as a primary calibration point to test whether other bifurcations in the phylogeny could also have been the result of vicariance events. The feasibility of three other vicariance events was explored: a) the closure of the Indonesian Seaway, resulting in sister lineages associated with the Indian Ocean and West Pacific, respectively; b) the closure of the Tethyan Seaway, resulting in sister lineages associated with the Indo-Pacific and Atlantic Ocean, respectively, and c) continental break-up during the Mesozoic followed by spreading of the Atlantic Ocean, resulting in pairs of lineages with amphi-Atlantic distribution patterns.     

Expanded thermal niche for a diving vertebrate: A leatherback turtle diving into near-freezing water

The global distribution of extant reptiles is more limited than that of mammals or birds, with low reptilian species diversity at high latitudes. Central to this limited geographical distribution is the ectothermic nature of reptiles, which means that they generally become torpid at cold temperatures. However, here we report the first detailed telemetry from a leatherback turtle (Dermochelys coriacea) diving in cold water at high latitude. An individual equipped with a satellite tag that relayed temperature-depth profiles dived continuously for many weeks into sub-surface waters as cold as 0.4 °C. Global warming will likely increase the foraging range of leatherback turtles further into temperate and boreal waters.