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9 results for “Ammospiza”
Cape Sable Seaside Sparrow (Ammospiza maritima mirabilis) breast feather total mercury concentrations from the Florida Everglades, Florida, USA: breeding seasons 2016 - 2018
This dataset was used to determine hydrologic parameters influencing Cape Sable Seaside Sparrow (CSSS) mercury exposure and potential mercury effects on their reproductive success in the Florida Everglades. We collected breast feathers for total mercury determination from juvenile and adult CSSS during (or shortly after) three breeding seasons (March 1 to July 31) and monitored the same individuals' breeding performance (mate status, number of nest attempts, number of successful nest attempts, total productivity of nests, clutch size, total count of eggs, and hatch success). Hydrologic parameters (average water depths, drought length, water recession rate, and hydroperiod) were estimated using the Everglades Depth Estimation Network and in situ depth measurements. Data collection is complete.
Data from: Breeding Ammospiza nelsoni (Nelson’s Sparrow) exploits both saltmarsh and hayfields in northern habitats
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Positive correlation between Ammospiza caudacuta (Saltmarsh Sparrow) capture and productivity supports use of a novel rapid assessment monitoring protocol
<p>Salt marshes in the northeastern United States provide critical breeding habitat for tidal marsh specialist birds like the Saltmarsh Sparrow (Ammospiza caudacuta). The Saltmarsh Sparrow population has declined by nine percent annually, necessitating immediate conservation actions for this vulnerable species. However, estimating species vital rates across a large geographic region is logistically challenging and cost prohibitive. Therefore, we developed and tested a rapid assessment monitoring protocol focused on reproductive metrics to enhance future conservation planning.</p> <p>We used three years of intensive demographic data from 12 sites to estimate daily nest survival, nest period success, fledglings produced per female, and successful broods per female. We implemented the rapid assessment protocol co-located at intensive sites in the same years to estimate the number of captured females and juveniles. We used Pearson's correlation analyses to determine the association of intensive metrics with rapid metrics. We found that the sum of Saltmarsh Sparrow female and juvenile captures was positively correlated with daily nest survival, nest period success, fledglings produced per female, and successful broods per female. Our results demonstrate that fixed-effort mist-netting from our rapid assessment protocol is an informative and time-efficient sampling method that can aid in making informed management decisions related to Saltmarsh Sparrow conservation.</p>
Data for: Surrounding landscape, habitat and hybridization dynamics drive population structure and genetic diversity in the Saltmarsh Sparrow (Ammospiza caudacuta)
<p class="MsoNormal">Determining factors that shape a species' population genetic structure is beneficial for identifying effective conservation practices. We assessed population structure and genetic diversity for Saltmarsh Sparrow (<em>Ammospiza caudacuta</em>), an imperiled tidal marsh specialist, using 13 microsatellite markers and 964 individuals sampled from 24 marshes across the breeding range. We show that Saltmarsh Sparrow populations are structured regionally by isolation-by-distance, with gene flow occurring among marshes within ~110-135 km of one another. Isolation-by-resistance and isolation-by-environment also shape genetic variation; several habitat and landscape features are associated with genetic diversity and genetic divergence among populations. Human development in the surrounding landscape isolates breeding marshes, reducing genetic diversity and increasing population genetic divergence, while surrounding marshland and patch habitat quality (proportion high marsh and sea-level-rise trend) have the opposite effect. The distance of the breeding marsh to the Atlantic Ocean also influences genetic variation, with marshes farther inland being more divergent than coastal marshes. In northern marshes, hybridization with Nelson's Sparrow (<em>A. nelsoni</em>) strongly influences Saltmarsh Sparrow genetic variation, by increasing genetic diversity in the population; this has a concomitant effect of increasing genetic differentiation of marshes with high levels of introgression. From a conservation perspective, we found that the majority of population clusters have low effective population sizes, suggesting a lack of resiliency. To conserve the representative breadth of genetic and ecological diversity and to ensure redundancy of populations, it will be important to protect a diversity of marsh types across the latitudinal gradient of the species range, including multiple inland, coastal and urban populations, which we have shown to exhibit signals of genetic differentiation. It will also require maintaining connectivity at a regional level, by promoting high marsh habitat at the scale of gene flow (~130 km), while also ensuring "stepping stone" populations across the range. </p>
Data for: Surrounding landscape, habitat and hybridization dynamics drive population structure and genetic diversity in the Saltmarsh Sparrow (Ammospiza caudacuta)
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Positive correlation between Ammospiza caudacuta (Saltmarsh Sparrow) capture and productivity supports use of a novel rapid assessment monitoring protocol
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Genomic data reveal the biogeographic and demographic history of Ammospiza sparrows in northeast tidal marshes
<p><b><i>Aim: </i></b>Shaped by both climate change and sea-level rise, tidal salt marshes represent ephemeral systems that are home to only a few, highly specialized species. The dynamic ecological histories and spatial complexities of these habitats, however, render it challenging to reconstruct the complete biogeographic histories of their endemic taxa. Here, we leverage three species of North American <i>Ammospiza </i>sparrows that inhabit tidal marshes ( <i>Ammospiza caudacuta</i>, <i>A. maritima</i>, and <i>A. n. subvirgatus</i>) and closely related freshwater species to demonstrate the utility of whole-genome data in resolving demographic and evolutionary history as it relates to divergence and dispersal events in ephemeral ecosystems. We employ a combination of demographic and biogeographic reconstructions to shed new light on the colonization history of freshwater-saline environments in this system.</p> <p><b><i>Location: </i></b>North America</p> <p><b><i>Taxon: </i></b> <i>Ammospiza Sparrows</i></p> <p><b><i>Methods: </i></b>We sequenced whole genomes from <i>Ammospiza </i>sparrows to address our objectives. We conducted phylogenomic analyses and reconstructed the demographic and biogeographic history of this clade based on 21 million SNPs from 54 total individuals.</p> <p><b><i>Results: </i></b>Phylogenies based on several million SNPs supported several well-resolved clades that predominantly corresponded to their prior species designations. Phylogenetic and biogeographic reconstructions suggest a series of saltwater to freshwater colonization events within this group, with some endemic taxa exhibiting associations with tidal marsh habitat over longer evolutionary time scales and some habitat transitions occurring as recently as 5,000 years ago. </p> <p><b><i>Main Conclusions: </i></b>Our reconstructions support a biogeographic hypothesis with fewer vicariance and dispersal events among <i>Ammospiza </i>sparrows that is in contrast with the currently supported evolutionary scenario. Biogeographic reconstructions further suggest saltwater to freshwater transitions in <i>A. n. subvirgatus </i>as opposed to the long hypothesized freshwater origin. Our results highlight the fact that reconstructing biogeographic and evolutionary dynamics in ephemeral systems poses challenges given the propensity for high turnover. This reinforces the importance of a multifaceted approach to biogeographic reconstructions in historically dynamic ecosystems.</p>
Genomic data reveal the biogeographic and demographic history of Ammospiza sparrows in northeast tidal marshes
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Data from: Range-wide population genetic analysis of Seaside Sparrows (Ammospiza maritima) supports at least five distinct population segments that do not align with current subspecies descriptions
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