Long-Term Changes, 1958–2010, In the Reproduction of Bald Eagles of Florida Bay, Southern Coastal Everglades

Baldwin, John W.; Bosley, Jason W.; Oberhofer, Lori; Bass, Oron L.; Mealey, Brian K.

doi:10.3356/jrr-11-65.1

Cited by 13 publications

(12 citation statements)

References 38 publications

(37 reference statements)

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“…The Florida Bay estuary holds the southernmost breeding population of Bald Eagles (Baldwin et al 2012). Located at the southern tip of Florida, Florida Bay is a subtropical mangrove-dominated estuary that has been altered over time with documented changes in ecosystem conditions (Butler et al 1995, Fourqurean and Robblee 1999, Hall et al 1999.…”

mentioning

confidence: 99%

“…Loss of seagrass, primarily Thalassia testudinum, increased suspension of sediment in the water (turbidity) and the frequency of algal blooms (Phlips et al 1995, Boyer et al 1999). These changes have affected multiple trophic levels in Florida Bay (Butler et al 1995, Thayer et al 1999, Powell 2003, Lorenz 2014, including Bald Eagles and waterbirds (Matheson et al 1999, Crozier and Gawlik 2003, Davis et al 2005, Frederick et al 2009, Lorenz et al 2009, Baldwin et al 2012, Ogden et al 2014.…”

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confidence: 99%

“…We hypothesized that the shift in ecological conditions in Florida Bay corresponds with changes in the type and size of prey of Bald Eagles. METHODS We collected prey remains at the end of each breeding season in 2009 and 2010 at nest sites that were both accessible and successful (Baldwin et al 2012) in that season, replicating methods employed by ENP staff in the 1970s (Robertson and Shea 1975). A territory was defined as successful if one or more young of fledgling size were present (Postupalsky 1974, Steenhof andNewton 2007).…”

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confidence: 99%

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Adjusted Diets of Bald Eagles (Haliaeetus leucocephalus) Breeding In An Altered Estuary

Hanson

Baldwin

2017

Journal of Raptor Research

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Adjusted Diets of Bald Eagles (Haliaeetus leucocephalus) Breeding In An Altered Estuary

Hanson

Baldwin

2017

Journal of Raptor Research

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“…First, the non-parametric and distribution-free test of Mann-Kendall (MK) was applied to the annual SRM values for the number of raptor territories to statistically determine whether there was a monotonic upward or downward trend of the variable of interest over time (Baldwin et al 2012). A monotonic upward/downward trend means that the variable consistently increases/decreases through time.…”

Section: Data Analysis Methodsmentioning

confidence: 99%

Systematic Raptor Monitoring as conservation tool: 12 year results in the light of landscape changes in Dadia-Lefkimi-Soufli National Park

Poirazidis¹

2017

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Dadia-Lefkimi-Soufli National Park forms part of the Natura 2000 network in a region of Greece and represents one of the most diverse landscapes for raptors (birds of prey) breeding in Europe. It is adjacent to Bulgaria and Turkey and is a renowned biodiversity hotspot. WWF Greece established a Systematic Raptor Monitoring scheme in this area in 2001.This study summarises the results of the first 12 years of monitoring in the National Park. Overall, 25 to 27 raptor species were recorded by pooling data, of which20 species reproduced in the National Park. Raptors with continuous presence in the National Park exhibited stable, species-specific inter-annual variation. An average of 348±15.4 raptor territories were distributed throughout the National Park for all species. The Common buzzard (Buteo buteo) and the Shorttoed eagle (Circaetus gallicus) were the most common species year-round, followed by the Lesser-spotted eagle (Clanga pomarina) and Booted eagle (Aquila pennata). The Long-legged buzzard (Buteo rufinus), Honey buzzard (Pernis apivorus) and Egyptian vulture (Neophron percnopterus) exhibited a noticeable drop in population numbers over the study period. A significant new entry was the re-appearance of the Whitetailed eagle (Haliaeetus albicilla), which was recorded breeding again in the region after a 21-year absence. Species trends, along with their ecological traits, are discussed with respect to landscape changes in Dadia NP and minimum viable population and territory thresholds are proposed to outline essential conservation issues. Although a multi-year balance of the total number of occupied territories for all species was recorded, the number of common species increased compared to specialist species which had smaller, de- RESEARCH ARTICLE Launched to accelerate biodiversity conservation A peer-reviewed open-access journalKonstantinos Poirazidis / Nature Conservation 22: 17-50 (2017) 18 clining populations. The abandoning of traditional livestock farming, which induces an increase in closedcanopy forest coverage, might have led to the decline of the Lesser-spotted eagle, Long-legged buzzard and Honey buzzard numbers. Additional pressure is added from specialist forest dwelling raptors which are favoured by this change in habitat. The results of this study are expected to provide useful insights to facilitate conservation and management decisions about raptors and their habitat in this region.

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“…This behavior may limit subadult breeding opportunities, or it may be (as Elliott et al 2006 posit) a foraging strategy to compensate for lower hunting efficiency. In a few parts of the continent, Bald Eagle populations are declining (e.g., Baldwin et al 2012) and appear to be experiencing declines in territory occupancy. A further understanding of how habitat and food resources may limit populations can inform management and conservation strategies across the range of Bald Eagles.…”

Section: Introductionmentioning

confidence: 99%

Bald eagle (Haliaeetus leucocephalus) population increases in Placentia Bay, Newfoundland: evidence for habitat saturation?

Letto¹,

Wiersma²,

Brazil³

et al. 2015

ACE

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ABSTRACT. Across North America, Bald Eagle (Haliaeetus leucocephalus) populations appear to be recovering following bans of DDT. A limited number of studies from across North America have recorded a surplus of nonbreeding adult Bald Eagles in dense populations when optimal habitat and food become limited. Placentia Bay, Newfoundland is one of these. The area has one of the highest densities of Bald Eagles in eastern North America, and has recently experienced an increase in the proportion of nonbreeding adults within the population. We tested whether the observed Bald Eagle population trends in Placentia Bay, Newfoundland during the breeding seasons 1990-2009 are due to habitat saturation. We found no significant differences in habitat or food resource characteristics between occupied territories and pseudo-absence data or between nest sites with high vs. low nest activity/occupancy rates. Therefore there is no evidence for habitat saturation for Bald Eagles in Placentia Bay and alternative hypotheses for the high proportion of nonbreeding adults should be considered. The Newfoundland population provides an interesting case for examination because it did not historically appear to be affected by pollution. An understanding of Bald Eagle population dynamics in a relatively pristine area with a high density can be informative for restoration and conservation of Bald Eagle populations elsewhere.Hausse de la population de Pygargue à tête blanche (Haliaeetus leucocephalus) dans la baie de Placentia, Terre-Neuve : indice de la saturation de l'habitat?RÉSUMÉ. Partout en Amérique du Nord, les populations de Pygargue à tête blanche (Haliaeetus leucocephalus) semblent se remettre à la suite de l'interdiction d'utilisation du DDT. Selon certaines recherches menées en Amérique du Nord, un surplus de pygargues adultes non nicheurs a été observé lorsque la densité des populations est élevée et que les conditions optimales d'habitat et de ressources alimentaires deviennent limitantes. La baie de Placentia, à Terre-Neuve, présente une telle situation : elle est l'hôte d'une densité de pygargues parmi les plus élevées de l'est de l'Amérique du Nord et a récemment connu une hausse du nombre d'adultes non nicheurs dans la population. Nous avons examiné si la saturation de l'habitat pouvait expliquer la tendance de la population de pygargues dans la baie de Placentia au cours des saisons de nidification de 1990 à 2009. Aucune différence significative des caractéristiques de l'habitat ou des ressources alimentaires n'a été observée entre les territoires occupés et ceux apparemment inoccupés, ni entre les sites de nidification montrant une forte activité de nidification/taux d'occupation et ceux en montrant une faible. Ainsi, il n'y a pas de preuve de saturation de l'habitat des pygargues dans la baie de Placentia, de sorte que d'autres hypothèses pouvant expliquer cette forte proportion d'adultes non nicheurs devraient être considérées. La population de Terre-Neuve représente un cas intéressant à examiner parce qu'elle n'aurait pas ...

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Long-Term Changes, 1958–2010, In the Reproduction of Bald Eagles of Florida Bay, Southern Coastal Everglades

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 13 publications

References 38 publications

Adjusted Diets of Bald Eagles (Haliaeetus leucocephalus) Breeding In An Altered Estuary

Adjusted Diets of Bald Eagles (Haliaeetus leucocephalus) Breeding In An Altered Estuary

Systematic Raptor Monitoring as conservation tool: 12 year results in the light of landscape changes in Dadia-Lefkimi-Soufli National Park

Bald eagle (Haliaeetus leucocephalus) population increases in Placentia Bay, Newfoundland: evidence for habitat saturation?

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