Population abundance and trends of Saltmarsh (Ammodramus caudacutus) and Nelson’s (A. nelsoni) Sparrows: influence of sea levels and precipitation

  title={Population abundance and trends of Saltmarsh (Ammodramus caudacutus) and Nelson’s (A. nelsoni) Sparrows: influence of sea levels and precipitation},
  author={W. Gregory Shriver and Kathleen M. O’Brien and Mark J. Ducey and Thomas P. Hodgman},
  journal={Journal of Ornithology},
Evidence of biological responses to climate change continues to grow. Long-term monitoring programs are critical in documenting these changes as well as identifying the primary stressors that may influence a species’ ability to adapt to changing climate. Eastern North American salt marshes support the greatest number of endemic salt marsh vertebrates globally, two of which are sympatric from southern Maine to northern Massachusetts, USA. Saltmarsh Sparrows (Ammodramus caudacutus), listed… 
Preventing local extinctions of tidal marsh endemic Seaside Sparrows and Saltmarsh Sparrows in eastern North America
ABSTRACT Globally limited to 45,000 km2, salt marshes and their endemic species are threatened by numerous anthropogenic influences, including sea-level rise and predator pressure on survival and
Factors that influence vital rates of Seaside and Saltmarsh sparrows in coastal New Jersey, USA.
Apparent adult survival and nest survival did not differ between unditched and ditched marshes for either species, indicating that marsh ditching history may not affect breeding habitat quality for these species.
Temporal shifts in the saltmarsh–Nelson’s sparrow hybrid zone revealed by replicated demographic and genetic surveys
It is concluded that despite increasing rates of introgression, hybridization poses a substantially lesser threat to parental populations than the imminent consequences of sea-level rise and habitat degradation.
Long-term monitoring of mercury in adult saltmarsh sparrows breeding in Maine, Massachusetts and New York, USA 2000–2017
It is found that mercury exposure differed by site and year but there was no consistent temporal trend across sites, and seasonal variation in blood mercury concentrations and a positive relationship between mercury concentrations of blood and innermost primary feather, but not between blood and tail feather.
Hypsometry of Cape Cod Salt Marshes (Massachusetts, U.S.A.) and Predictions of Marsh Vegetation Responses to Sea-Level Rise
ABSTRACT Smith, S.M.; Tyrrell, M.; Medeiros, K.; Bayley, H.; Fox, S.; Adams, M.; Mejia, C.; Dijkstra, A.; Janson, S., and Tanis, M., 2017. Hypsometry of Cape Cod salt marshes (Massachusetts, U.S.A.)
Survey frequency and timing affect occupancy and abundance estimates for salt marsh birds
The scenario of 3 visits early in the season provided the lowest error estimates of occupancy and abundance, and Distributing the survey effort across the season, the early-middle-late scenario, provided high variance estimates and should be avoided when designing monitoring programs for these tidal marsh obligate species.
Annual variation in the offspring sex ratio of Saltmarsh Sparrows supports Fisher's hypothesis
The finding of a 1:1 offspring sex ratio and interannual variation in offspring and adult sex ratios in a wild bird population is more consistent with the predictions of Fisher (1930) than with those of Trivers and Willard (1973).
First documentation of malaria parasites (genus Plasmodium) in the Saltmarsh Sparrow (Ammodramus caudacutus) and patterns of infection with mercury exposure
A comparison study of Saltmarsh Sparrows and Plasmodium infection with Blood Mercury Levels reveals clear patterns in the distribution of these parasites and the immune defences of these Sparrows are disturbed.
Predictors of specialist avifaunal decline in coastal marshes
It is suggested that tidal restriction may accelerate degradation of tidal marsh resilience to sea-level rise by limiting sediment supply necessary for marsh accretion, resulting in specialist habitat loss in tidally restricted marshes.
Population viability of Seaside and Saltmarsh sparrows in New Jersey


Fine-Scale Population Structure and Asymmetrical Dispersal in an Obligate Salt-Marsh Passerine, the Saltmarsh Sparrow (Ammodramus caudacutus)
The genetic structure that is found in Saltmarsh Sparrows may result from natal philopatry and breeding-site fidelity, combined with restricted dispersal due to obligate dependence on a patchy habitat, and suggest that fine-scale population structure may be important in some migratory passerines.
Nesting ecology of Saltmarsh Sharp-tailed Sparrows in a tidally restricted salt marsh
It is hypothesize that restoration efforts will have short-term negative impacts on Saltmarsh Sharptailed Sparrow populations until salt marsh habitats are restored in higher sections of the marsh.
Planning for Sea-Level Rise: Quantifying Patterns of Saltmarsh Sparrow (Ammodramus Caudacutus) Nest Flooding Under Current Sea-Level Conditions
ABSTRACT. Climate change and sea-level rise pose an imminent threat to the survival of coastal ecosystems, but the mechanisms by which animals inhabiting these areas may be affected by these
Tidal Marshes: A Global Perspective on the Evolution and Conservation of Their Terrestrial Vertebrates
Tidal marshes and their endemic fauna face broad threats from a variety of human-caused environmental changes, and future research should focus on global inventories, intercontinental comparative work, and investigation to determine why almost all presently described endemic taxa appear to be found in North America.
It is shown that Saltmarsh Sharp-tailed Sparrow males were nonterritorial and promiscuous and provided no parental care to young, and adaptation to tidal flooding partially explains the evolution of the unique Saltm Marsh Sharp-tails Sparrow mating system.
Abstract With the designation of Nelson's Sharp-tailed Sparrow (Ammodramus nelsoni) and Saltmarsh Sharp-tailed Sparrow (A. caudacutus) as species of high conservation priority in the northeastern
Application of Genealogical-Concordance Principles to the Taxonomy and Evolutionary History of the Sharp-Tailed Sparrow (Ammodramus caudacutus)
By taxonomically formalizing what appears to be a fundamental phylogenetic partition among Sharp-tailed Sparrow populations, study of the biogeographic history, reproductive relationships, and management of the forms will be facilitated.
The importance of productivity to the dynamics of a Swainson's thrush population
It is suggested that Swainson's Thrushes at Palomarin are most limited by the production of young on the breeding grounds, and the link between productivity and adult abundance in this population is strengthened.
Trends and population dynamics of a Velvet Scoter (Melanitta fusca) population: influence of density dependence and winter climate
It is concluded that density dependence and winter conditions must be taken into consideration when discussing population changes in seaducks in general and the Velvet Scoter in particular.