| mercury concentrations in tidal marsh sparrows and their use as bioindicators in delaware bay, usa. | mercury (hg) contamination from industrial sources is pervasive throughout north america and is recognized by the us environmental protection agency as a health hazard for wildlife and humans. avian species are commonly used as bioindicators of hg because they are sensitive to contaminants in the environment and are relatively easy to sample. however, it is important to select the appropriate avian species to use as a bioindicator, which should be directly related to the project objectives. in t ... | 2010 | 20135218 |
| predictors of specialist avifaunal decline in coastal marshes. | coastal marshes are one of the world's most productive ecosystems. consequently, they have been heavily used by humans for centuries, resulting in ecosystem loss. direct human modifications such as road crossings and ditches and climatic stressors such as sea-level rise and extreme storm events have the potential to further degrade the quantity and quality of marsh along coastlines. we used an 18-year marsh-bird database to generate population trends for 5 avian species (rallus crepitans, tringa ... | 2017 | 27542096 |
| a quantile count model of water depth constraints on cape sable seaside sparrows. | 1. a quantile regression model for counts of breeding cape sable seaside sparrows ammodramus maritimus mirabilis (l.) as a function of water depth and previous year abundance was developed based on extensive surveys, 1992-2005, in the florida everglades. the quantile count model extends linear quantile regression methods to discrete response variables, providing a flexible alternative to discrete parametric distributional models, e.g. poisson, negative binomial and their zero-inflated counterpar ... | 2008 | 17976184 |
| a new approach to the "apparent survival" problem: estimating true survival rates from mark-recapture studies. | survival estimates generated from live capture-mark-recapture studies may be negatively biased due to the permanent emigration of marked individuals from the study area. in the absence of a robust analytical solution, researchers typically sidestep this problem by simply reporting estimates using the term "apparent survival." here, we present a hierarchical bayesian multistate model designed to estimate true survival by accounting for predicted rates of permanent emigration. initially we use dis ... | 2012 | 22919897 |
| population genetics of seaside sparrow (ammodramus maritimus) subspecies along the gulf of mexico. | seaside sparrows (ammodramus maritimus) along the gulf of mexico are currently recognized as four subspecies, including taxa in florida (a. m. juncicola and a. m. peninsulae) and southern texas (ammodramus m. sennetti), plus a widespread taxon between them (a. m. fisheri). we examined population genetic structure of this "gulf coast" clade using microsatellite and mtdna data. results of bayesian analyses (structure, geneland) of microsatellite data from nine locations do not entirely align with ... | 2014 | 25412194 |
| molecular genetic relationships of the extinct dusky seaside sparrow. | mitochondrial dna from the extinct dusky seaside sparrow (ammodramus maritimus nigrescens) was compared in terms of nucleotide sequence divergence to mitochondrial dnas from extant populations of seaside sparrows. analyses of restriction sites revealed a close phylogenetic affinity of a. m. nigrescens to other sparrow populations along the atlantic coast of the united states but considerable genetic distance from gulf coast birds. concerns and applied management strategies for the seaside sparro ... | 1989 | 17834232 |
| factors that influence vital rates of seaside and saltmarsh sparrows in coastal new jersey, usa. | as saltmarsh habitat continues to disappear, understanding the factors that influence saltmarsh breeding bird population dynamics is an important step for the conservation of these declining species. using five years (2011 - 2015) of demographic data, we evaluated and compared seaside (ammodramus maritimus) and saltmarsh (a. caudacutus) sparrow apparent adult survival and nest survival at the edwin b. forsythe national wildlife refuge, new jersey, usa. we determined the effect of site management ... | 2017 | 29479129 |
| ultraviolet-assisted oiling assessment improves detection of oiled birds experiencing clinical signs of hemolytic anemia after exposure to the deepwater horizon oil spill. | while large-scale oil spills can cause acute mortality events in birds, there is increasing evidence that sublethal oil exposure can trigger physiological changes that have implications for individual performance and survival. therefore, improved methods for identifying small amounts of oil on birds are needed. because ultraviolet (uv) light can be used to identify thin crude oil films in water and on substrate that are not visually apparent under normal lighting conditions, we hypothesized that ... | 2020 | 32785887 |
| a multi-biomarker approach supports the use of compound-specific stable isotope analysis of amino acids to quantify basal carbon source use in a salt marsh consumer. | determining the flow of energy from primary producers to higher trophic levels in complex systems remains an important task for ecologists. biomarkers can be used to trace carbon or energy sources contributing to an organism's tissues. however, different biomarkers vary in their ability to trace carbon sources based on how faithfully they transfer between trophic levels. comparing emerging biomarker techniques with more commonly used techniques can demonstrate the relative efficacy of each in sp ... | 2019 | 31344761 |
| polycyclic aromatic hydrocarbon exposure in seaside sparrows (ammodramus maritimus) following the 2010 deepwater horizon oil spill. | the seaside sparrow (ammodramus maritimus) is an abundant and permanent resident of coastal salt marshes impacted by the 2010 bp deepwater horizon oil spill. such terrestrial species are often overlooked in the aftermath of marine spills, despite the potential for long-term oil exposure. we sampled the livers of seaside sparrows residing in oiled and unoiled sites from 2011 to 2014 and quantified expression of cytochrome p450 1a (cyp1a), a gene involved in the metabolism of polycyclic aromatic h ... | 2018 | 29554730 |