Sharp-shinned Hawk (Accipiter striatus)

2020 ◽  
Author(s):  
Keith L. Bildstein ◽  
Kenneth D. Meyer ◽  
Clayton M. White ◽  
Jeffrey S. Marks ◽  
Guy M. Kirwan
Keyword(s):  
Accipiter Striatus

Sharp-shinned Hawk (Accipiter striatus)

2000 ◽  
Author(s):  
Keith L. Bildstein ◽  
Kenneth D. Meyer
Keyword(s):  
Accipiter Striatus

Systematics and conservation of an endemic radiation of Accipiter hawks in the Caribbean islands

The Auk ◽  
2021 ◽  
Author(s):  
Therese A Catanach ◽  
Matthew R Halley ◽  
Julie M Allen ◽  
Jeff A Johnson ◽  
Russell Thorstrom ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Bird Species ◽  
Species Level ◽  
Anthropogenic Factors ◽  
Nucleotide Polymorphisms ◽  
Reciprocal Monophyly ◽  
Island Populations ◽  
Mitochondrial Haplotypes ◽  
Accipiter Striatus ◽  
The Caribbean

Abstract More than one-third of the bird species found in the Caribbean are endemic to a set of neighboring islands or a single island. However, we have little knowledge of the evolutionary history of the Caribbean avifauna, and the lack of phylogenetic studies limits our understanding of the extent of endemism in the region. The Sharp-shinned Hawk (Accipiter striatus) occurs widely across the Americas and includes 3 endemic Caribbean taxa: venator on Puerto Rico, striatus on Hispaniola, and fringilloides on Cuba. These island populations have undergone extreme declines presumably due to ecosystem changes caused by anthropogenic factors, as well as due to severe hurricanes. Sharp-shinned Hawks, in general, and Caribbean Sharp-shinned Hawks, in particular, have not been placed in a modern phylogenetic context. However, the island taxa have historically been presumed to have some ongoing gene flow with mainland populations. Here we sequenced ultraconserved elements (UCEs) and their flanking regions from 38 samples, focusing on Caribbean taxa. Using a combination of UCEs, mitochondrial genome sequences, and single-nucleotide polymorphisms, we investigated the phylogenetic relationships among Caribbean lineages and their relationships to mainland taxa. We found that Caribbean Sharp-shinned Hawks are reciprocally monophyletic in all datasets with regard to mainland populations and among island taxa (with no shared mtDNA haplotypes) and that divergence in the NADH dehydrogenase 2 gene (ND2) between these mainland and island groups averaged 1.83%. Furthermore, sparse non-negative matrix factorization (sNMF) analysis indicated that Hispaniola, Puerto Rico, and mainland samples each form separate populations with limited admixture. We argue that our findings are consistent with the recognition of the 3 resident Caribbean populations as species-level taxa because nuclear and mitochondrial genetic data indicate reciprocal monophyly and have species-level divergences, there is no sharing of mitochondrial haplotypes among or between island taxa and those on the mainland; and they are diagnosable by plumage.

scholarly journals Pupipara (Diptera, Hippoboscidae) in wild birds attended at a rehabilitation center in southern Brazil

2019 ◽  
Vol 28 (2) ◽  
pp. 330-332 ◽  
Author(s):  
Renata Fagundes Moreira ◽  
Laura de Campos Farezin ◽  
Ugo Araújo Souza ◽  
Bruna Zafalon da Silva ◽  
Derek Blaese Amorim ◽  
...  
Keyword(s):  
New Records ◽  
Bird Species ◽  
Rehabilitation Center ◽  
Porto Alegre ◽  
Bubo Virginianus ◽  
Wild Mammals ◽  
Accipiter Striatus ◽  
Parabuteo Unicinctus ◽  
Pathogenic Agents ◽  
Veterinary Hospital

Abstract The hippoboscids are cosmopolitan permanent obligate hematophagous ectoparasites of birds, domestic and wild mammals and, occasionally, humans. Some species may act as vectors or hosts of etiological pathogenic agents. The aims of this study were to report on the first cases of Hippoboscidae in Crax blumenbachii and Parabuteo unicinctus; to provide new reports from Brazil on Tyto furcata and Asio stygius parasitized by Icosta americana; to report on individuals of Bubo virginianus, Falco sparverius and Accipiter striatus parasitized by genera Ornithoctona; and to provide new reports on parasitism of O. erythrocephala in the state of Rio Grande do Sul. The birds of prey and C. blumenbachii were attended at a rehabilitation center in Porto Alegre and at a veterinary hospital in Cruz Alta. These new records demonstrate the huge gap that exists regarding studies on avian ectoparasites and highlight potential vectors of hemoparasites for the bird species studied.

Feather mercury increases with feeding at higher trophic levels in two species of migrant raptors, Merlin (Falco columbarius) and Sharp-shinned Hawk (Accipiter striatus)

The Condor ◽  
2020 ◽  
Vol 122 (2) ◽  
Author(s):  
Edward R Keyel ◽  
Matthew A Etterson ◽  
Gerald J Niemi ◽  
David C Evers ◽  
Christopher R DeSorbo ◽  
...  
Keyword(s):  
Trophic Levels ◽  
Fresh Weight ◽  
Nitrogen Stable Isotope ◽  
Moderate Risk ◽  
Toxic Heavy Metal ◽  
Carbon And Nitrogen ◽  
Midwestern Usa ◽  
Accipiter Striatus ◽  
Δ 15N ◽  
Risk Categories

Abstract Mercury (Hg) is a toxic heavy metal that, when methylated to form methylmercury (MeHg), bioaccumulates in exposed animals and biomagnifies through food webs. The purpose of this study was to assess Hg concentrations in raptors migrating through the upper midwestern USA. From 2009 to 2012, 966 raptors of 11 species were captured at Hawk Ridge, Duluth, Minnesota, USA. Breast feathers were sampled to determine the concentration of total Hg. Mean Hg concentrations ranged from 0.11 to 3.46 μg g−1 fresh weight across species and were generally higher in raptors that feed on birds in comparison with those that feed on mammals. To evaluate the effect of dietary sources on Hg biomagnification, carbon and nitrogen stable isotope ratios were measured in feathers of the 2 species with the highest Hg concentrations, Merlin (Falco columbarius) and Sharp-shinned Hawk (Accipiter striatus). Measured δ 13C values were similar in both species and indicated a primarily terrestrial-derived diet, whereas δ 15N values suggested that individual Merlin and Sharp-shinned Hawk feeding at higher trophic levels accumulated higher concentrations of Hg. The risk to birds associated with measured levels of feather Hg was evaluated by calculating blood-equivalent values using an established algorithm. Predicted blood values were then compared to heuristic risk categories synthesized across avian orders. This analysis suggested that while some Merlin and Sharp-shinned Hawk were at moderate risk to adverse effects of MeHg, most of the sampled birds were at negligible or low risk.

Partitioning of Food and Niche Characteristics of Coexisting Accipiter During Breeding

The Auk ◽  
1984 ◽  
Vol 101 (4) ◽  
pp. 761-779 ◽  
Author(s):  
Richard T. Reynolds ◽  
E. Charles Meslow
Keyword(s):  
Prey Size ◽  
The State ◽  
Total Density ◽  
Frequency Of Occurrence ◽  
Number Of Species ◽  
Accipiter Striatus ◽  
Shrub Canopy ◽  
Northern Goshawks ◽  
Nesting Season ◽  
Cooper's Hawks

AbstractThe abundance of resources and their use by Accipiter in two areas within Oregon from 1969 through 1974 are presented. In the coastal mountains of northwestern Oregon only Sharp-shinned Hawks (Accipiter striatus) and Cooper's Hawks (A. cooperii) nested. In the remainder of the state, A. striatus, A. cooperii, and Northern Goshawks (A. gentilis) were syntopic during the nesting season. The number of species and the total density of birds in eastern Oregon were about one-half those in northwestern Oregon. Mean prey size of A. striatus in northwestern Oregon (12.8 g) was significantly smaller than that of the same species in eastern Oregon (28.4 g). Accipiter striatus diets in both areas were composed almost entirely of birds (<5% mammals). Mean prey size of A. cooperii in both areas was nearly the same (134.7 g vs. 136.3 g) and was significantly larger than mean prey size of A. striatus. The frequency of occurrence and the size of prey taxa in A. cooperii diets, however, varied between areas: 74% birds (x̄ = 79.2 g) and 25% mammals (x̄ = 296.4 g) in northwestern Oregon versus 47% birds (x̄ = 123.7 g) and 53% mammals (x̄ = 147.5 g) in eastern Oregon. Mean prey size of A. gentilis in eastern Oregon (306.6 g) was significantly larger than that of A. cooperii and consisted of 55% birds (x̄ = 195.5 g) and 45% mammals (x̄ = 445.2 g). An analysis of prey sizes, prey taxa, and foraging heights indicated that, in general, food was partitioned in both areas primarily according to prey size. In eastern Oregon, however, where A. cooperii and A. gentilis overlapped broadly in prey size, these species tended to take different prey taxa. Both A. cooperii and A. gentilis foraged primarily in the lower zones (ground-shrub and shrub-canopy), whereas A. striatus foraged in the upper canopy.

scholarly journals Using oxygen and hydrogen stable isotopes to track the migratory movement of Sharp-shinned Hawks (Accipiter striatus) along Western Flyways of North America

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0226318
Author(s):  
Elizabeth A. Wommack ◽  
Lisa C. Marrack ◽  
Stefania Mambelli ◽  
Joshua M. Hull ◽  
Todd E. Dawson
Keyword(s):  
Stable Isotope ◽  
North America ◽  
Large Scale ◽  
Pacific Coast ◽  
Isotope Analysis ◽  
Western North America ◽  
Migration Routes ◽  
The Pacific ◽  
Accipiter Striatus ◽  
Hydrogen And Oxygen Isotope

The large-scale patterns of movement for the Sharp-shinned Hawk (Accipiter striatus), a small forest hawk found throughout western North America, are largely unknown. However, based on field observations we set out to test the hypothesis that juvenile migratory A. striatus caught along two distinct migration routes on opposite sides of the Sierra Nevada Mountains of North America (Pacific Coast and Intermountain Migratory Flyways) come from geographically different natal populations. We applied stable isotope analysis of hydrogen (H) and oxygen (O) of feathers, and large scale models of spatial isotopic variation (isoscapes) to formulate spatially explicit predictions of the origin of the migrant birds. Novel relationships were assessed between the measured hydrogen and oxygen isotope values of feathers from A. striatus museum specimens of known origin and the isoscape modeled hydrogen and oxygen isotope values of precipitation at those known locations. We used these relationships to predict the origin regions for birds migrating along the two flyways from the measured isotope values of migrant’s feathers and the associated hydrogen and oxygen isotopic composition of precipitation where these feathers were formed. The birds from the two migration routes had overlap in their natal/breeding origins and did not differentiate into fully separate migratory populations, with birds from the Pacific Coast Migratory Flyway showing broader natal geographic origins than those from the Intermountain Flyway. The methodology based on oxygen isotopes had, in general, less predictive power than the one based on hydrogen. There was broad agreement between the two isotope approaches in the geographic assignment of the origins of birds migrating along the Pacific Coast Flyway, but not for those migrating along the Intermountain Migratory Flyway. These results are discussed in terms of their implications for conservation efforts of A. striatus in western North America, and the use of combined hydrogen and oxygen stable isotope analysis to track the movement of birds of prey on continental scales.

scholarly journals Mitochondrial DNA suggests recent origins in two coastal avian subspecies in northwestern North America

2016 ◽  
Author(s):  
Rebecca Cheek ◽  
Kyle K Campbell ◽  
Robert Dickerman ◽  
Berry Wijdeven ◽  
Kevin Winker
Keyword(s):  
Mitochondrial Dna ◽  
Population Divergence ◽  
Phenotypic Data ◽  
Southeast Alaska ◽  
Island Populations ◽  
Queen Charlotte Islands ◽  
Great Blue Heron ◽  
Accipiter Striatus ◽  
History Of ◽  
Northwestern North America

Genetic studies of subspecies endemic to Haida Gwaii (Queen Charlotte Islands), British Columbia and the Alexander Archipelago of southeast Alaska have frequently found genetic corroboration for these phenotypically based taxa. Divergence and speciation are common among island populations of birds, and evidence suggests this region has fostered such divergence during previous glacial maxima. We examined genetic divergence in mitochondrial DNA (mtDNA) of two coastal subspecies endemic to this region: sharp-shinned hawk (Accipiter striatus perobscurus) and great blue heron (Ardea herodias fannini). Genetic diversity in both species was remarkably low, with both coastal subspecies possessing only the most common haplotype found in continental populations. We found low but significant population divergence between A. s. perobscurus and continental populations of sharp-shinned hawks and no significant population divergence in the herons. The refugial history of the region suggests that these subspecies may have arisen relatively recently compared with other regional endemics for which genetic and phenotypic data both show divergence. Alternatively, species-wide selective sweeps of mtDNA prior to divergence may have rendered this genetic marker less useful for tracking that divergence.

Sharp-shinned Hawk (Accipiter striatus)

2000 ◽  
Author(s):  
Keith L. Bildstein ◽  
Kenneth D. Meyer
Keyword(s):  
Accipiter Striatus
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