Julie L. Yee

Western Ecological Research Center

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Joshua T. Ackerman

United States Geological Survey

Michael C. Kenner

United States Geological Survey

Adam E. Duerr

West Virginia University

Mark P. Herzog

United States Geological Survey

Terrence L. Adelsbach

United States Fish and Wildlife Service

Susan E. W. De La Cruz

United States Geological Survey

Eric M. Roberts

James Cook University

Escola Tècnica Superior d'Enginyeria Industrial de Barcelona

John Y. Takekawa

Western Ecological Research Center

David M. Nelson

University of Maryland Center for Environmental Science

Cooperative Institutions

United States Geological Survey

Western Ecological Research Center

University of California, Davis

United States Fish and Wildlife Service

University of California, Santa Cruz

Entertainment Industries Council

Pacific Island Ecosystems Research Center

Rocky Mountain Research Station

University of California, Berkeley

Ecological Society of America

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Resource selection and space use by sea ducks during the non-breeding season: Implications for habitat conservation planning in urbanized estuaries

Biological Conservation (2013)

Susan E. W. De La Cruz John M. Eadie A. Keith Miles Julie L. Yee Kyle A. Spragens

Critical habitat

Herring gull

10.1016/j.biocon.2013.10.021

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Citations (24)

Prediction of fish and sediment mercury in streams using landscape variables and historical mining

The Science of The Total Environment (2016)

Charles N. Alpers Julie L. Yee Joshua T. Ackerman James L. Orlando D. G. Slotton

Mercury

Methylmercury

10.1016/j.scitotenv.2016.05.088

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Citations (26)

Atmospheric dry deposition in the vicinity of the Salton Sea, California—II: Measurement and effects of an enhanced evaporation system

Atmospheric Environment (2005)

R. Alonso Andrzej Bytnerowicz Julie L. Yee William I. Boarman

Deposition

Inorganic ions

10.1016/j.atmosenv.2005.04.017

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Citations (7)

Detection probabilities of bird carcasses along sandy beaches and marsh edges in the northern Gulf of Mexico

Environmental Monitoring and Assessment (2019)

Guthrie S. Zimmerman Veronica Varela Julie L. Yee

Abstract We estimated detection probabilities of bird carcasses along sandy beaches and in marsh edge habitats in the northern Gulf of Mexico to help inform models of bird mortality associated with the Deepwater Horizon oil spill. We also explored factors that may influence detection probability, such as carcass size, amount of scavenging, location on the beach, habitat type, and distance into the marsh. Detection probability for medium-sized carcasses (200–500 g) ranged from 0.82 (SE = 0.09) to 0.93 (SE = 0.04) along sandy beaches. Within sandy beaches, we found that intact/slightly scavenged carcasses were easier to detect than heavily scavenged ones and did not find strong effects of location on the beach on detection probability. We estimated detection rate for each combination of scavenging state, carcass size, and position along sandy beaches. In marsh edge habitats, detection ranged from 0.04 (SE = 0.04) to 0.86 (SE = 0.10), with detection rates rapidly increasing from small (< 200 g) to medium carcass sizes and leveling off between medium and extra-large (> 1000 g) carcasses regardless of vegetation type ( Spartina or Phragmites ). Carcasses of all sizes were generally harder to locate in Spartina -dominated marshes than in Phragmites -dominated ones. A subset of the data for which we could adequately assess the effect of distance into the marsh indicated that detection rates generally declined the farther a carcass was into marsh vegetation. Based on power analyses, our ability to identify predictors that influence detection rates would be higher with larger numbers of carcasses, greater numbers of search trials per carcass, or more balanced sampling distributions across predictor values.

Phragmites

Spartina alterniflora

Spartina

10.1007/s10661-019-7924-z

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Citations (7)

Interactions between methylmercury and selenomethionine injected into mallard eggs

Environmental Toxicology and Chemistry (2011)

Jon D. Klimstra Julie L. Yee Gary H. Heinz David J. Hoffman Katherine R. Stebbins

Methylmercury chloride and seleno-L-methionine were injected separately or in combinations into mallard eggs (Anas platyrhynchos), and embryo mortality and teratogenic effects (deformities) were modeled using a logistic regression model. Methylmercury was injected at doses that resulted in concentrations of 0, 0.2, 0.4, 0.8, and 1.6 µg/g Hg in the egg on a wet weight basis and selenomethionine at doses that resulted in concentrations of 0, 0.1, 0.2, 0.4, and 0.6 µg/g Se in the egg, also on a wet weight basis. When selenomethionine and methylmercury were injected separately, hatching probability decreased in both cases. However, when methylmercury was injected at 1.6 µg/g in combination with selenomethionine at 0.2 µg/g, the presence of the methylmercury resulted in less embryo mortality than had been seen with 0.2 µg/g Se by itself, but it increased the number of deformed embryos and hatchlings. Selenomethionine appeared to be more embryotoxic than equivalent doses of methylmercury when injected into eggs, and both injected methylmercury and selenomethionine were more toxic to mallard embryos than when deposited naturally in the egg by the mother. The underlying mechanisms behind the interactions between methylmercury and selenomethionine and why methylmercury appeared to improve hatching probability of Se-dosed eggs yet increased deformities when the two compounds were combined are unclear. These findings warrant further studies to understand these mechanisms in both laboratory and field settings.

Methylmercury

Hatchling

10.1002/etc.1708

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Citations (17)

Egg‐laying sequence influences egg mercury concentrations and egg size in three bird species: Implications for contaminant monitoring programs

Environmental Toxicology and Chemistry (2015)

Joshua T. Ackerman Collin A. Eagles‐Smith Mark P. Herzog Julie L. Yee C. Alex Hartman

Bird eggs are commonly used in contaminant monitoring programs and toxicological risk assessments, but intraclutch variation and sampling methodology could influence interpretability. The authors examined the influence of egg-laying sequence on egg mercury concentrations and burdens in American avocets, black-necked stilts, and Forster's terns. The average decline in mercury concentrations between the first and last eggs laid was 33% for stilts, 22% for terns, and 11% for avocets, and most of this decline occurred between the first and second eggs laid (24% for stilts, 18% for terns, and 9% for avocets). Trends in egg size with egg-laying order were inconsistent among species, and overall differences in egg volume, mass, length, and width were <3%. The authors summarized the literature, and among 17 species studied, mercury concentrations generally declined by 16% between the first and second eggs laid. Despite the strong effect of egg-laying sequence, most of the variance in egg mercury concentrations still occurred among clutches (75-91%) rather than within clutches (9%-25%). Using simulations, the authors determined that accurate estimation of a population's mean egg mercury concentration using only a single random egg from a subset of nests would require sampling >60 nests to represent a large population (10% accuracy) or ≥14 nests to represent a small colony that contained <100 nests (20% accuracy). Environ Toxicol Chem 2016;35:1458-1469. Published 2015 Wiley Periodicals Inc. on behalf of SETAC. This article is a US Government work and, as such, is in the public domain in the United States of America.

Mercury

Bird egg

10.1002/etc.3291

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Citations (33)

Kelp-forest dynamics controlled by substrate complexity

Proceedings of the National Academy of Sciences (2022)

Zachary Randell Michael C. Kenner Joseph A. Tomoleoni Julie L. Yee Márk Novák

Significance Kelp forests are declining worldwide due to varied combinations of environmental change and the trophic downgrading of urchin-controlling predators. These processes have increased the frequency and extent of rapid, nonlinear shifts to so-called urchin barrens whose ecological functioning and services are reduced relative to those of kelp forests. Understanding the factors that regulate kelp-forest tipping points and switches between states is key to their management. Here we demonstrate that substrate complexity (surface rugosity) determines both the existence of and dynamic transition between community states around San Nicolas Island, CA. Kelp-forest conservation and restoration efforts are growing internationally and may benefit from the consideration of substrate complexity in their strategies.

Kelp forest

Rugosity

10.1073/pnas.2103483119

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Citations (19)

Black Abalone surveys at Naval Base Ventura County, San Nicolas Island, California—2021, annual report

Antarctica A Keystone in a Changing World (2022)

Michael C. Kenner Julie L. Yee

First posted December 13, 2022 For additional information, contact: Director, Western Ecological Research CenterU.S. Geological Survey3020 State University Drive EastSacramento, California 95819 The U.S. Geological Survey monitors a suite of intertidal black abalone sites at San Nicolas Island, California, in cooperation with the U.S. Navy, which owns the island. The nine rocky intertidal sites were established in 1980 to study the potential effect of translocated sea otters on the intertidal black abalone population at the island. The sites were monitored from 1981 to 1997, usually annually or biennially. Monitoring resumed in 2001 and has been completed annually since then. Since 2018, the work has been carried out by the U.S. Geological Survey Western Ecological Research Center. The study sites became particularly important, from a management perspective, after a virulent disease decimated black abalone populations throughout southern California beginning in the mid-1980s. The disease, withering syndrome, was first observed on San Nicolas Island in 1992 and during the next few years, it reduced the population there by more than 99 percent. The species was subsequently listed as endangered under the Endangered Species Act in 2009.The subject of this report is the 2021 survey of the sites and how the measured population status compares to the long-term data (collected over several decades) at San Nicolas Island. During the last two decades, the total monitored black abalone population at the island has grown approximately ten-fold after the disease related decline, from about 200 to more than 2,000 abalone. Since it was first consistently measured in 2005, the mean distance between adjacent black abalone has decreased substantially from approximately 50 centimeters to less than 15 centimeters, indicating that abalone are close enough together at several of the sites to reproduce successfully. The 2021 counts were the first since 2016 to indicate a possible decline in the monitored population at San Nicolas Island. Although still more than ten times the population counted in 2001, counts on the transects dropped by 13.6 percent from the survey count in 2020. The most significant decline was the loss of 341 abalone, from the previous count of 547, on a transect that since 2002 had the highest count of all 44 transects. Between 2020 and 2021, there were increases and decreases at the sites and the transects at each site. Although the 2021 count was lower than the 2020 count, it was the second highest since 1997. Based on the number of small abalone counted, recruitment rates were similar to most years since 2008 and higher than the rates observed before the population declines resulting from withering syndrome.

10.3133/ofr20221107

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Citations (2)

McArthur Basin Interpretive Summary - Kyalla - Mainoru Interval, NT, Australia

D Revie Tim E. Ruble Eric M. Roberts Brian Hankins Julie L. Yee

Source

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Citations (0)

Whole-Body Concentrations of Elements in Three Fish Species from Offshore Oil Platforms and Natural Areas in the Southern California Bight, USA

Bulletin of Marine Science (2013)

Milton S. Love Michael K. Saiki Thomas W. May Julie L. Yee

There is concern that offshore oil platforms off Southern California may be contributing to environmental contaminants accumulated by marine fishes. To examine this possibility, 18 kelp bass (Paralabrax clathratus Girard, 1854), 80 kelp rockfish (Sebastes atrovirens Jordan and Gilbert, 1880), and 98 Pacific sanddab (Citharichthys sordidus Girard, 1854) were collected from five offshore oil platforms and 10 natural areas during 2005-2006 for whole-body analysis of 63 elements. Forty-two elements were excluded from statistical comparisons as they (1) consisted of major cations that were unlikely to accumulate to potentially toxic concentrations; (2) were not detected by the analytical procedures; or (3) were detected at concentrations too low to yield reliable quantitative measurements. The remaining 21 elements consisted of aluminum, arsenic, barium, cadmium, chromium, cobalt, copper, gallium, iron, lead, lithium, manganese, mercury, nickel, rubidium, selenium, strontium, tin, titanium, vanadium, and zinc. Statistical comparisons of these elements indicated that none consistently exhibited higher concentrations at oil platforms than at natural areas. However, the concentrations of copper, selenium, titanium, and vanadium in Pacific sanddab were unusual because small individuals exhibited either no differences between oil platforms and natural areas or significantly lower concentrations at oil platforms than at natural areas, whereas large individuals exhibited significantly higher concentrations at oil platforms than at natural areas.

10.5343/bms.2012.1078

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Citations (11)