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Distribution, Abundance, and Breeding Activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2020 Annual Report
Executive SummarySurveys for the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) were done at Marine Corps Base Camp Pendleton (MCBCP or “Base”), California, between May 4 and July 31, 2020. All of MCBCP’s historically occupied riparian habitat (core survey area) was surveyed for flycatchers in 2020. Additionally, one-fifth of the unoccupied riparian habitat (non-core survey
Authors
Scarlett L. Howell, Barbara E. Kus
Effects of elevated pCO2 on bioenergetics and disease susceptibility in Pacific herring Clupea pallasii
Ocean acidification can affect the immune responses of fish, but effects on pathogen susceptibility remain uncertain. Pacific herring Clupea pallasii were reared from hatch under 3 CO2 partial pressure ( pCO2) treatments (ambient, ∼650 µatm; intermediate, ∼1500 µatm; high, ∼3000 µatm) through metamorphosis (98 d) to evaluate the effects of ocean acidification on bioenergetics and susceptibility to
Authors
Christopher Murray, Jacob L. Gregg, Ashley MacKenzie, Hiruni Jayasekara, Sophie Hall, Terrie Klinger, Paul Hershberger
Fish beta diversity associated with hydrologic and anthropogenic disturbance gradients in contrasting stream flow regimes
Understanding the role of hydrologic variation in structuring aquatic communities is crucial for successful conservation and sustainable management of native freshwater biodiversity. Partitioning beta diversity into the additive components of spatial turnover and nestedness can provide insight into the forces driving variability in fish assemblages across stream flow regimes. We examined stream fi
Authors
John Tyler Fox, Cyndy Loftin
Evaluation of extinction risk for stream fishes within an urban riverscape using population viability analysis
1. The Santa Ana River in the Los Angeles region of California demonstrates common habitat degradation symptoms that are characteristic of the urban stream syndrome. These impacts have altered the Santa Ana River community structure, with few species as impacted as the native Santa Ana sucker (sucker; Pantosteus santaanae). 2. Consequently, a recovery plan developed for sucker identified the need
Authors
Brock Huntsman, Kai Palenscar, Kerwin Russell, Brett Mills, Chris Jones, William Ota, Kurt E. Anderson, Heather Dyer, Fitsum Abadi, Marissa L. Wulff
Signatures of wave erosion in Titan’s coasts
The shorelines of Titan’s hydrocarbon seas trace flooded erosional landforms such as river valleys; however, it is unclear whether coastal erosion has subsequently altered these shorelines. Spacecraft observations and theoretical models suggest that wind may cause waves to form on Titan’s seas, potentially driving coastal erosion, but the observational evidence of waves is indirect, and the proces
Authors
Rose Elizabeth Palermo, Andrew D. Ashton, Jason M. Soderblom, Samuel P. D. Birch, Alexander G. Hayes, J. Taylor Perron
Microbial communities in standing dead trees in ghost forests are largely aerobic, saprophytic, and methanotrophic
Standing dead trees (snags) are recognized for their influence on methane (CH4) cycling in coastal wetlands, yet the biogeochemical processes that control the magnitude and direction of fluxes across the snag-atmosphere interface are not fully elucidated. Herein, we analyzed microbial communities and fluxes at one height from ten snags in a ghost forest wetland. Snag-atmosphere CH4 fluxes were hig
Authors
Mary Jane Carmichael, Melinda Martinez, Suzanna L. Bräuer, Marcelo Ardón
Bioconcentration of per- and polyfluoroalkyl substances and precursors in fathead minnow tissues environmentally exposed to aqueous film-forming foam-contaminated waters
Exposure to per- and polyfluoroalkyl substances (PFAS) has been associated with toxicity in wildlife and negative health effects in humans. Decades of fire training activity at Joint Base Cape Cod (MA, USA) incorporated the use of aqueous film-forming foam (AFFF), which resulted in long-term PFAS contamination of sediments, groundwater, and hydrologically connected surface waters. To explore the b
Authors
Nicholas I. Hill, Jitka Becanova, Simon Vojta, Larry B. Barber, Denis R. LeBlanc, Alan M. Vajda, Heidi M. Pickard, Rainer Lohmann
River channel response to the removal of the Pilchuck River Diversion Dam, Washington State
In August 2020, the 3-m tall Pilchuck River Diversion Dam was removed from the Pilchuck River, allowing free fish passage to the upper third of the watershed for the first time in over a century. The narrow, 300-m long impoundment behind the dam was estimated to hold 4,000–7,500 m3 of sand and gravel, representing less than one year's typical bedload flux. Repeat cross section surveys, stage senso
Authors
Scott W. Anderson, Brett Shattuck, Neil Shea, Catherine M. Seguin, Joe J. Miles, Derek Marks, Natasha Coumou
Documenting historical anchorworm parasitism of introduced warmwater fishes in the Willamette River Basin, Oregon
Anchorworms (Lernaea spp.) are freshwater parasitic copepods that use a wide range of hosts. Yet little is known about their prevalence, distribution, and which species are their primary fish hosts in the state of Oregon. Institutional fish collections serve as banks which allow investigators to look at historical fish specimens and ascertain their health status at the time of their collection. We
Authors
Elena Eberhardt, Christina Amy Murphy, William J. Gerth, Peter Konstantinidis, Ivan Arismendi
Fish size structure analysis via ordination: A visualization aid
ObjectiveVisual aids like length-frequency histograms are widely used to examine fish population status and trends; however, comparing multiple histograms simultaneously becomes cumbersome and inefficient. Complicating matters further, overlaying covariates on histograms to highlight connections with length frequencies can be challenging. An alternative, and the subject of this Perspective, is to
Authors
Leandro E. Miranda
Demographics of a previously undocumented diamondback terrapin (Malaclemys terrapin) population
Coastal habitats are some of the most imperiled due to climate change and anthropogenic activities. As such, it is important to understand population dynamics of the species that may play a role in regulating coastal systems. Diamondback terrapins in Northwest Florida have been understudied, which has resulted in a gap in our knowledge for this region. To help fill this gap, we conducted a capture
Authors
Daniel J. Catizone, Travis M. Thomas, Christina Romagosa, Margaret Lamont
Distribution, abundance, and habitat characteristics of Coastal Cactus Wrens (Campylorhynchus brunneicapillus) in San Diego County, California—2023 Data Summary
Executive SummaryWe surveyed for coastal Cactus Wren (Campylorhynchus brunneicapillus) in 507 established plots in San Diego County in 2023, encompassing 4 genetic clusters (Otay, Lake Jennings, Sweetwater/Encanto, and San Pasqual). Two surveys were completed at each plot between March 1 and July 31. Cactus Wrens were detected in 181 plots (36 percent of plots). Cactus Wrens were detected in 26 pe
Authors
Suellen Lynn, Barbara E. Kus