54 Works

Data from: Sexual selection on male vocal fundamental frequency in humans and other anthropoids

David A. Puts, Alexander K. Hill, Drew H. Bailey, Robert S. Walker, Drew Rendall, John R. Wheatley, Lisa L. M. Welling, Khytam Dawood, Rodrigo A. Cárdenas, Robert P. Burriss, Nina G. Jablonski, Mark D. Shriver, Daniel J. Weiss, Adriano R. Lameira, Coren L. Apicella, Michael J. Owren, Claudia Barelli, Mary E. Glenn & Gabriel Ramos-Fernandez
In many primates, including humans, the vocalizations of males and females differ dramatically, with male vocalizations and vocal anatomy often seeming to exaggerate apparent body size. These traits may be favoured by sexual selection because low-frequency male vocalizations intimidate rivals and/or attract females, but this hypothesis has not been systematically tested across primates, nor is it clear why competitors and potential mates should attend to vocalization frequencies. Here we show across anthropoids that sexual dimorphism...

Data from: Evidence of weaker phenotypic plasticity by prey to novel cues from non-native predators

Johan Hollander & Paul E. Bourdeau
A central question in evolutionary biology is how coevolutionary history between predator and prey influences their interactions. Contemporary global change and range expansion of exotic organisms impose a great challenge for prey species, which are increasingly exposed to invading non-native predators, with which they share no evolutionary history. Here, we complete a comprehensive survey of empirical studies of coevolved and naive predator−prey interactions to assess whether a shared evolutionary history with predators influences the magnitude...

Data from: Corralling a black swan: natural range of variation in a forest landscape driven by rare, extreme events

Daniel C. Donato, Joshua S. Halofsky & Matthew J. Reilly
The natural range of variation (NRV) is an important reference for ecosystem management, but has been scarcely quantified for forest landscapes driven by infrequent, severe disturbances. Extreme events such as large, stand-replacing wildfires at multi-century intervals are typical for these regimes; however, data on their characteristics are inherently scarce, and, for land management, these events are commonly considered too large and unpredictable to integrate into planning efforts (the proverbial ‘Black Swan’). Here, we estimate the...

Data from: Mast seeding patterns are asynchronous at a continental scale

Jalene LaMontagne, Ian Pearse, David Greene & Walter Koenig
Resource pulses are rare events with a short duration and high magnitude that drive the dynamics of both plant and animal populations and communities. Mast seeding is perhaps the most common type of resource pulse that occurs in terrestrial ecosystems, is characterized by the synchronous and highly variable production of seed crops by a population of perennial plants, is widespread both taxonomically and geographically, and is often associated with nutrient scarcity. The rare production of...

Growth and flowering responses of eelgrass to simulated grazing and fecal addition by brant geese

Daniel Barton, Frank Shaughnessy, Susannah Ferson, Adam Frimodig, Matthew Hurst & Jeffrey Black
These data represent the responses of eelgrass (Zostera marina) beds to a series of experimental treatments conducted in 2004 and 2005 in the vicinity of Hookton Channel, Humboldt Bay, California, USA. We measured eelgrass density, growth, biomass, and flowering as the primary response variables to clipping, brant (Branta bernicla) fecal addition, clipping and fecal addition, and control treatments in a 2004 destructively sampled randomized block design meant to simulate different effects of brant grazing and...

Admixture may be extensive among hyperdominant Amazon rainforest tree species

Drew Larson, Oscar Vargas, Alberto Vicentini & Christopher W. Dick
Admixture is a mechanism by which species of long-lived plants may acquire novel alleles. However, the potential role of admixture in the origin and maintenance of tropical plant diversity is unclear. We ask whether admixture occurs in an ecologically important clade of Eschweilera (Parvifolia clade, Lecythidaceae), which includes some of the most widespread and abundant tree species in Amazonian forests. Using target capture sequencing, we conducted a detailed phylogenomic investigation of 33 species in the...

Data from: The effects of phylogeny, habitat, and host characteristics on the thermal sensitivity of helminth development

Jessica Phillips, Juan Vargas Soto, Samraat Pawar, Janet Koprivnikar, Daniel Benesh & Péter Molnár
Helminth parasites are part of almost every ecosystem, with more than 300 000 species worldwide. Helminth infection dynamics are expected to be altered by climate change, but predicting future changes is difficult due to lacking thermal sensitivity data for greater than 99.9% of helminth species. Here, we compiled the largest dataset to date on helminth temperature sensitivities and used the Metabolic Theory of Ecology to estimate activation energies (AEs) for parasite developmental rates. The median...

Anna's hummingbird (Calypte anna) physiological response to novel thermal and hypoxic conditions at high elevations

Austin Spence, Hannah LeWinter & Morgan Tingley
Many species have not tracked their thermal niches upslope as predicted by climate change, potentially because higher elevations are associated with abiotic challenges beyond temperature. To better predict if organisms can continue to move upslope with rising temperatures, we need to understand their physiological performance when subjected to novel high elevation conditions. Here, we captured Anna’s hummingbirds – a species expanding their elevational distribution in concordance with rising temperatures – from across their current elevational...

Data from: Small founding number and low genetic diversity in an introduced species exhibiting limited invasion success (speckled dace, Rhinichthys osculus)

Andrew P. Kinziger, Rodney J. Nakamoto, Eric C. Anderson & Bret C. Harvey
Molecular evaluations of successful invaders are common, however studies of introduced species that have had limited invasion success, or have died out completely, are rare. We studied an introduced population of speckled dace (Rhinichthys osculus) from northern California, USA that has rapidly increased in abundance but remained restricted to a 25-km stretch of river since its introduction in the mid-1980s. Field and laboratory analyses indicate that invasion success of speckled dace is constrained by the...

Data from: Speciation, population structure, and demographic history of the Mojave Fringe-toed Lizard (Uma scoparia), a species of conservation concern

Andrew D. Gottscho, Sharyn B. Marks & William Bryan Jennings
The North America deserts were impacted by both Neogene plate tectonics and Quaternary climatic fluctuations, yet it remains unclear how these events influenced speciation in this region. We tested published hypotheses regarding the timing and mode of speciation, population structure, and demographic history of the Mojave Fringe-toed Lizard (Uma scoparia), a sand dune specialist endemic to the Mojave Desert of California and Arizona. We sampled 109 individual lizards representing 22 insular dune localities, obtained DNA...

Data from: Species distribution models of an endangered rodent offer conflicting measures of habitat quality at multiple scales

William T. Bean, R. Stafford, H. Scott Butterfield, Laura R. Prugh, Michael Westphal & Justin S. Brashares
1. The high cost of directly measuring habitat quality has led ecologists to test alternate methods for estimating and predicting this critically important ecological variable. In particular, it is frequently assumed but rarely tested that models of habitat suitability (“species distribution models”, SDMs) may provide useful indices of habitat quality, either from an individual animal or manager’s perspective. Critically, SDMs are increasingly used to estimate species’ ranges, with an implicit assumption that areas of high...

Data from: Seed predation has the potential to drive a rare plant to extinction

Helen M. Kurkjian, Sydney K. Carothers & Erik S. Jules
1. Pre-dispersal seed predation is sometimes considered unlikely to dramatically affect plant population growth because plants are generally expected to produce more seeds than there are safe sites for germination. Lupinus constancei is a rare herb of limited distribution, with fewer than 400 reproductive individuals restricted to a single square kilometre of north-western California, USA. In addition to the vulnerability resulting from its extremely small population size, L. constancei faces heavy seed predation by small...

Data from: Strong dispersal limitation in post-fire regeneration of Baker cypress, a rare serotinous conifer

Jeffrey Kane, Bret McNamara & David Greene
PREMISE: Dispersal capacity primarily determines the spatial establishment patterns that drive range expansions and contractions in tree species. For Baker cypress (Hesperocyparis bakeri [(Jeps.) Bartel]), seedling establishment relies predominantly on fire events due to its cone serotiny, shade intolerance, and small seeds requiring the optimal conditions of fire-exposed, mineral soil seedbeds. METHODS: This study quantified the density and spatial distribution of post-disturbance seedlings following the 2014 Eiler fire in northern California and compared the observed...

Data from: Historical population size change and differentiation of relict populations of the endangered giant kangaroo rat

Mark J. Statham, William T. Bean, Nathan Alexander, Michael F. Westphal & Benjamin N. Sacks
From a conservation management perspective it is important to understand how genetic diversity is partitioned across a species’ range, including (1) identification of evolutionarily distinct units versus those recently isolated through anthropogenic activities and (2) the relative genetic contributions among components of fragmented (meta)populations. To address these questions, we investigated the phylogeography and metapopulation structure among relict populations of the endangered giant kangaroo rat (Dipodomys ingens) in the highly altered San Joaquin Desert Ecosystem. This...

Predicted distribution of a rare and understudied forest carnivore: Humboldt martens (Martes caurina humboldtensis)

Katie Moriarty, Joel Thompson, Matthew Delheimer, Brent Barry, Mark Linnell, Taal Levi, Keith Hamm, Desiree Early, Holly Gamblin, Micaela Szykman-Gunther, Jordan Ellison, Janet Prevey, Jennifer Hartman & Raymond Davis
Many mammalian species have experienced range contractions. Following a reduction in distribution that has resulted in apparently small and disjunct populations, the Humboldt marten (Martes caurina humboldtensis) was recently designated as federally Threatened and state Endangered. This subspecies of Pacific marten occurring in coastal Oregon and northern California, also known as coastal martens, appear unlike martens that occur in snow-associated regions in that vegetation associations appear to differ widely between Humboldt marten populations. We expected...

Redwood Creek Chinook salmon life cycle model code and data

Emily Chen, Nicholas Som, John Deibner-Hanson, David Anderson & Mark Henderson
Understanding the spatial and temporal habitat use of a population is a necessary step for restoration decision making. For Chinook salmon (Oncorhynchus tshawytscha), variation in their migration and habitat use complicate predicting how restoring habitats will impact total recruitment. To evaluate how juvenile life history variation affects a population’s response to potential restoration, we developed a stage-structured model for a Chinook salmon population in a northern California river with a seasonally closed estuary. We modeled...

Evolutionary history constrains heat tolerance of native and exotic tropical Zingiberales

Georgia G. Hernández, Timothy M. Perez, Oscar M. Vargas, W. John Kress, Ramón Molina-Bravo, Roberto A. Cordero & Carlos García-Robledo
Tropical wet forest plants experience relatively stable temperatures throughout the year. However, tropical forests represent a mosaic of habitats characterized by different temperatures. Heat tolerances are expected to be adapted to temperatures specific to their habitats. Although the heat tolerance of species sharing similar environments is expected to be similar, it is also possible that heat tolerance is constrained by evolutionary history because closely related species usually display similar physiologies. When exotic species are introduced...

Data from: Effect of an invasive plant and moonlight on rodent foraging behavior in a coastal dune ecosystem

Matthew D. Johnson & Yesenia L. De León
Understanding how invasive plants may alter predator avoidance behaviors is important for granivorous rodents because their foraging can trigger ripple effects in trophic webs. Previous research has shown that European beach grass Ammophila arenaria, an invasive species in coastal California, affects the predation of other seeds by the rodents Microtus californicus, Peromyscus maniculatus, and Reithrodontomys megalotis. This may be due to lower perceived predation risk by rodents foraging in close proximity to the cover provided...

Data from: Complex phylogeography and historical hybridization between sister taxa of freshwater sculpin (Cottus).

Jason Baumsteiger, Andrew P. Kinziger, Stewart B. Reid & Andres Aguilar
Species ranges which span different geographic landscapes frequently contain cryptic species or population-level structure. Identifying these possible diversification factors can often be accomplished under a comparative phylogeographic framework. However comparisons suffer if previous studies are limited to a particular group or habitat type. In California, a complex landscape has led to several phylogeographic breaks, primarily in terrestrial species. However two sister taxa of freshwater fish, riffle sculpin (Cottus gulosus) and Pit sculpin (C. pitensis), display...

Data from: Lepidostroma vilgalysii, a new basidiolichen from the New World

Brendan P. Hodkinson, Jessie K. Uehling & Matthew E. Smith
The lichenized basidiomycete Lepidostroma vilgalysii is described from Mexico based on morphological analyses. The species is only the second representative of the family Lepidostromataceae documented from the New World, and is one of the few described lichens with an inverted morphology, with the algae in a layer at the base of the thallus. Molecular sequence data from the nuclear ribosomal LSU locus are used to confirm the placement of the holotype in Lepidostroma and to...

Data from: Evolutionary hotspots in the Mojave Desert

Amy G. Vandergast, Richard D. Inman, Kelly R. Barr, Kenneth E. Nussear, Todd C. Esque, Stacie A. Hathaway, Dustin A. Wood, Philip A. Medica, Jesse W. Breinholt, Catherine L. Stephen, Andrew D. Gottscho, Sharyn B. Marks, W. Bryan Jennings, Robert N. Fisher, Jesse Breinholt, Andrew Gottscho, Sharyn Marks, W. Jennings, Amy Vandergast, Richard Inman, Kelly Barr, Kenneth Nussear, Todd Esque, Stacie Hathaway, Dustin Wood … & Catherine Stephen
Genetic diversity within species provides the raw material for adaptation and evolution. Just as regions of high species diversity are conservation targets, identifying regions containing high genetic diversity and divergence within and among populations may be important to protect future evolutionary potential. When multiple co-distributed species show spatial overlap in high genetic diversity and divergence, these regions can be considered evolutionary hotspots. We mapped spatial population genetic structure for 17 animal species across the Mojave...

Data from: Using occupancy modeling to compare environmental DNA to traditional field methods for regional-scale monitoring of an endangered aquatic species

Molly C. Schmelzle & Andrew P. Kinziger
Environmental DNA (eDNA) monitoring approaches promise to greatly improve detection of rare, endangered, and invasive species in comparison to traditional field approaches. Herein, eDNA approaches and traditional seining methods were applied at 29 research locations to compare method-specific estimates of detection and occupancy probabilities for endangered tidewater goby (Eucyclogobius newberryi). At each location multiple paired seine hauls and water samples for eDNA analysis were taken, ranging from two to 23 samples per site, depending upon...

Data from: Prescribed fire and conifer removal promote positive understorey vegetation responses in oak woodlands

Amy C. Livingston, J. Morgan Varner, Erik S. Jules, Jeffrey M. Kane & Leonel A. Arguello
Fire-prone woodlands and savannas world-wide face management challenges resulting from fire exclusion and subsequent encroachment of fire-sensitive trees. In the Pacific Northwest (USA), Quercus garryana oak woodlands and savannas are threatened by encroachment from the native conifer Pseudotsuga menziesii in the absence of fire. In the Bald Hills of Redwood National Park (California, USA), prescribed fire and conifer removal have been used to restore encroached woodlands. We examined the effects of encroachment and restoration on...

Data from: Genetic diversity and divergence in the fountain darter (Etheostoma fonticola): implications for conservation of an endangered species

Jeffrey B. Olsen, Andrew P. Kinziger, John K. Wenburg, Cara J. Lewis, Catherine T. Phillips & Kenneth G. Ostrand
The endangered fountain darter Etheostoma fonticola is found only in the Comal and San Marcos rivers in the Guadalupe River basin in central Texas, USA. Comal River fountain darters were believed to be extir- pated following a severe drought in the 1950s and were reintroduced in the early 1970s using 457 darters from the San Marcos River. In this study we used 23 microsatellite loci to describe and evaluate the genetic diversity, population structure and...

Data from: Sympatric population divergence within a highly pelagic seabird species complex (Hydrobates spp.)

Rebecca S. Taylor, Anna Bailie, Previn Gulavita, Tim Birt, Tomas Aarvak, Tycho Anker-Nilssen, Daniel C. Barton, Kirsten Lindquist, Yuliana Bedolla-Guzmán, Petra Quillfeldt & Vicki L. Friesen
Both physical and non-physical barriers can restrict gene flow among seabird populations. Understanding the relative importance of non-physical barriers, such as breeding phenology, is key to understanding seabird biodiversity. We investigated drivers of diversification in the Leach’s storm-petrel species complex (Hydrobates spp.) by examining population genetic structure across its range. Variation in the mitochondrial control region and six microsatellite loci was assayed in birds sampled from breeding colonies throughout the North Atlantic and North Pacific...

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Affiliations

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