Treesearch

Recent climate and disturbance conditions in Western U.S. forests have led to significant reforestation needs, necessitating the development of climate-informed management strategies. Promising adaptation strategies include assisted population migration, the movement of seed sources or populations to new locations within the historical species range, combined with silvicultural establishment practices that can improve short-term seedling survival and longer term stand resilience to future climate. Presently, there are challenges to the operational use of assisted population migration and...

Multiple studies have found that exposure to greenspace during pregnancy is associated with increased birthweight (Hu et al., 2021) and a reduced probability of a small-for-gestational-age birth. However, because exposure to greenspace is associated with demographic correlates of health, studies may suffer from residual confounding. In addition, results may be influenced by the self-selection of healthier women into greener neighborhoods. We address these limitations by using the number of trees planted around maternal address as a novel exposure metric. Compared to existing tree cover,...

The protection of headwater streams faces increasing challenges, exemplified by limited global recognition of headwater contributions to watershed resiliency and a recent US Supreme Court decision limiting federal safeguards. Despite accounting for ~77% of global river networks, the lack of adequate headwaters protections is caused, in part, by limited information on their extent and functions—in particular, their flow regimes, which form the foundation for decision-making regarding their protection. Yet, headwater streamflow is challenging to comprehensively measure and model; it is...

Because riparian ecosystems are highly valued for their diverse ecological services, past and ongoing disturbances in riparian zones have led to extensive restoration efforts, litigation, and compliance monitoring of the effects of livestock grazing. Better understanding of the factors that influence cattle riparian use, especially in landscapes supporting threatened or endangered fish, could lead to improved predictions of management outcomes and riparian recovery for sustainable grazing systems. Although published models predict habitat selection by cattle, there is a gap in our understan...

The Fender’s blue butterfly (Icaricia icarioides fenderi) is a federally listed threatened species occurring in the Willamette Valley, Oregon. The species depends on intact, native prairie environments with plants used for nectar sources and egg-laying. This report provides photos of selected locations with the species presence and provides views of conditions and changes under seasonal and management activities, particularly focused on conditions providing suitable habitat.

The repatriation of species is common, especially in conservation efforts aimed at restoring trophic interactions. Whether the Eltonian niches of restored species are conserved in reassembled ecological communities is largely unknown. Within mammalian carnivores, we hypothesized that the Eltonian niches of sympatric competitors would be structured by trophic facilitation from subsidies provided by large carnivores (i.e. carrion) and humans (i.e. food subsidies). Using stable isotopes (δ13C, δ15N), we quantified the Eltonian niches of an apex predator, the grey wolf Canis lupus and two...

California has experienced increasing frequency and intensity of wildfire, with the five largest fires on record since 2018. Over the same period, licensed cannabis production has grown to a high-grossing industry, while remaining an important source of rural livelihood. Importantly, the geography of cannabis production overlaps with high fire hazard areas more than any other crop in the state. We developed and deployed a state-wide survey of licensed outdoor producers to determine direct and indirect impacts of wildfire, as well as how producers have responded to these threats. Quantitativ...

Human-induced land use practices can result in the bioaccumulation of metals in turtles. We assessed relationships between land use and pollutant concentrations in painted turtles (Chrysemys picta) and snapping turtles (Chelydra serpentina) through non-destructive tissue sampling across 22 sites within a mixed-use watershed in north-central West Virginia, U.S.A.. Metal concentrations were consistently higher in nails than in blood. Selenium levels in soil and turtle nails were positively correlated with proximity to mine land. Lead levels in turtle nails were positively correlated with Pb...

Opportunities are rare to study ecological primary succession and physical channel development in brand-new streams. An exception exists in streams recently formed atop extensive pyroclastic materials deposited during the 1980 eruption of Mount St Helens (USA), an area known as the Pumice Plain. Recent work demonstrated unexpectedly high diversity of benthic invertebrates in Pumice Plain streams at <4 decades post eruption, both within and among streams. Given the ecological importance of the hyporheic zone (HZ), we asked if differential development of HZs, both physically and biologically,...

In recent decades, evidence of interactions between aboveground and belowground (i.e., soil) subsystems has accumulated. The effects of aboveground vertebrates on belowground communities have traditionally focused on plant-mediated pathways, but we show that aboveground vertebrates impact belowground communities and ecological functions without plant-mediated pathways via both consumptive and non-consumptive processes. We then show that mobile, aboveground vertebrates have significant but often unrealized potential to structure soil communities from local to macroecological scales by...