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This dataset describes mesopredator locations (raccoons and striped skunks), dabbling duck nest locations (mallard, gadwall, and cinnamon teal), northern harrier nest locations, and random locations in relation to a set of habitat features in Suisun Marsh, California during 2016 through 2019. We designed a series of questions to link fine-scale predator movements and vulnerability of dabbling duck nests to predator encounters and egg predation. We conducted our study over a 4-year period using 41 GPS-collared raccoons and striped skunks, two of the most widespread mammalian predators of waterfowl eggs in North America, and more than 2000 monitored duck nests. Each night of movement for mesopredators contains the...
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We used free-ranging northern elephant seals as a model species to investigate maternal transfer of mercury (Hg) to pups in relation to maternal traits, including maternal blood mercury concentrations, and to quantify the links between pup lanugo mercury concentrations and maternal mesopelagic foraging behavior during gestation. We satellite tracked known-age adult females at sea during their seven-month-long foraging trip to determine maternal foraging strategies (geographic locations and diving depths) and quantified mercury concentrations in maternal blood and their pups’ blood and lanugo (which is defined as pup hair grown in utero) early in lactation when seals were hauled out. We then tested how the maternal...
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Methylmercury contamination of the environment is an important issue globally, and birds are useful bioindicators for mercury monitoring programs. The available data on mercury contamination of birds in western North America were synthesized. Original data from multiple databases were obtained and a literature review was conducted to obtain additional mercury concentrations. In total, 29219 original bird mercury concentrations from 225 species were compiled, and an additional 1712 mean mercury concentrations, representing 19998 individuals and 176 species, from 200 publications were obtained. To make mercury data comparable across bird tissues, published equations of tissue mercury correlations were used to convert...
Categories: Publication; Types: Citation
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Eggshells of 13 waterbird species were divided in half longitudinally and the outer eggshell membrane was removed from one of the halves. Eggshell thickness was measured for both eggshell halves, both with and without the outer eggshell membrane. The eggshell membrane thickness was calculated by taking the difference between the two thickness measurements. These data support the following publication: Santolo, G.M., Peterson, S.H., Cooney, B., Hartman, C.A., Herzog, M.P. and Ackerman, J.T., 2024. Eggshell membrane thickness and its contribution to total eggshell thickness for 13 waterbird species. The Wilson Journal of Ornithology. https://doi.org/10.1676/23-00017
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This dataset describes nocturnal incubation recess behavior for mallard and gadwall hens nesting in Grizzly Island Wildlife Area in breeding seasons 2015-2018. It includes the frequency, start time and duration of recesses, and details a method for determining whether a recess was initiated in response to a predator at the nest using nest temperature data. These data support the following publication: Croston, R.L., Peterson, S.E., Hartman, C.A., Herzog, M.P., Feldheim, C.L., Casazza, M.L., Ackerman, J.T., 2021. Nocturnal incubation recess and flushing behavior by duck hens. Ecology and Evolution
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Bird and habitat surveys were conducted in winter-flooded rice fields in the Sacramento Valley, California, USA during the fall and winters of 2021-2022 (Oct 2021 through February 2022) and 2022-2023 (December 2022 through February 2023). Rice field sampling consisted of (1) a bird survey that was followed by (2) an overall habitat assessment and (3) a more detailed habitat transect survey. Rice farms in the Sacramento Valley are organized into separate rice fields that each consist of multiple smaller rice checks. This dataset contains 253 surveyed rice checks with the observed bird abundances for each rice check, calculated diversity metrics, and measured habitat variables. These data support the following publication:...
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This dataset represents 179 unique adult female northern elephant seals that were sampled between 2011 and 2021 during four different life history states (early breeding, late breeding, early molting, and late molting) at the Ano Nuevo colony in California, USA. Some individual seals were sampled multiple times, resulting in a total of 313 tissue samples. Tissue samples were collected from seals and quantified for total mercury (whole blood and muscle), cortisol (serum), and 10 blood biomarkers (total thyroxine, total triiodothyronine, reverse triiodothyronine, immunoglobulin E, immunoglobulin G, immunoglobulin M, interleukin-6, interleukin-1-beta, progesterone, and estradiol). These data support the following...
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Eggshell thickness was measured at the egg equator and poles (sharp pole and blunt pole) for 12 avian species. Eggshell thickness was related to egg morphometrics (egg length and width), embryonic development, egg status, and mercury contamination. Individual eggshells each have up to 3 thickness measurements, linked by the eggshell identification. Each measurement has the corresponding egg length, egg width, egg status, mercury concentration, and nest identification. Additionally, eggshell thickness was measured at 5 equally spaced positions along the longitude of the egg (sharp pole, quarter egg, half egg, three quarter egg, and blunt pole) in a subset of Forster's tern (Sterna forsteri) eggs. These data support...
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Eggshell thickness was measured at the egg equator and sharp pole for 5 songbird species. Each egg has thickness measurements at two locations on the egg and the corresponding egg length, egg width, egg volume, relative incubation age, egg identification, and nest identification. These data support the following publication: Schacter, C.R., Peterson, S.H., Hartman, C.A., Herzog, M.P., and Ackerman, J.T., 2024. Eggshell thickness and egg morphometrics in five songbird species from the Central Valley, California. Journal of Field Ornithology, 95(1), p.3. https://doi.org/10.5751/JFO-00410-950103.
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We conducted a multi-year study (2016-2019) to quantify sources of duckling mortality, identify predator type, and estimate survival rates for Mallard (Anas platyrhynchos) and Gadwall (Mareca strepera) ducklings within Suisun Marsh, California.
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Total mercury concentrations were determined in hair and whole blood of raccoons and skunks in Suisun Marsh from 2016 to 2019. Individual skunks and raccoons were identified by a unique identifier (Animal_ID) and some animals were sampled multiple times. This dataset includes animal sex, age class, the date the sample was collected, animal body mass, head length, and head-to-torso length. These data support the following publication: Peterson, Sarah H., Ackerman, J.T., Hartman, C.A., Casazza, M.L., Feldheim, C.L., and Herzog, M.P. 2020. Mercury exposure in mammalian mesopredators inhabiting a brackish marsh. Environmental Pollution
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This data release contains three files. The first (Table S1 Bibliography Dataset) contains the entire bibliography for the 435 publications examined for potential inclusion into at least one of the meta-analyses for the effects of environmental mercury (Hg) on birds. For those 168 publications that were included in at least one meta-analysis, the worksheet titled Bibliography contains data describing each sub-dataset, including the type of study, data extraction methods, biological endpoints measured, age class, tissue-residue Hg concentrations, dosing Hg concentrations, the measured effect of Hg, bird taxonomy, life history, and the study’s citation. The worksheet titled Header Explanation describes each column...
    map background search result map search result map Avian Eggshell Thickness for 12 Species in the Western U.S. from 2014 to 2018 Hair and blood total mercury concentrations in raccoons and striped skunks from Suisun Marsh 2016 to 2019 Nocturnal Incubation Recess and Flushing Behavior by Duck Hens Nesting in Grizzly Island Wildlife Area 2015-2018 Predator Movements and Duck Nests in Relation to Habitat Features in Suisun Marsh, CA (2016-2019) Mercury, Cortisol, and Blood Biomarkers in Adult Female Northern Elephant Seals from 2011 to 2021 Eggshell Thickness in 5 Songbird Species Maternal Transfer of Mercury to Northern Elephant Seal Pups Egg Membrane Thickness in 13 Waterbird Species Duckling Survival in a Brackish Marsh Bird use of Winter-Flooded Rice Fields in the Sacramento Valley, California Mercury, Cortisol, and Blood Biomarkers in Adult Female Northern Elephant Seals from 2011 to 2021 Hair and blood total mercury concentrations in raccoons and striped skunks from Suisun Marsh 2016 to 2019 Duckling Survival in a Brackish Marsh Nocturnal Incubation Recess and Flushing Behavior by Duck Hens Nesting in Grizzly Island Wildlife Area 2015-2018 Predator Movements and Duck Nests in Relation to Habitat Features in Suisun Marsh, CA (2016-2019) Eggshell Thickness in 5 Songbird Species Bird use of Winter-Flooded Rice Fields in the Sacramento Valley, California Egg Membrane Thickness in 13 Waterbird Species Avian Eggshell Thickness for 12 Species in the Western U.S. from 2014 to 2018 Maternal Transfer of Mercury to Northern Elephant Seal Pups