| lead toxicosis and trace element levels in wild birds and mammals at a firearms training facility. | in may 1999, lead poisoning was diagnosed in a yellow-rumped warbler (dendroica coronata) and a gray squirrel (sciurus carolinensis) found at the federal law enforcement training center (fletc), glynn county, ga, based on detection of 6.2 and 90.0 ppm wet weight (ww) lead in the liver of the warbler and squirrel, respectively. from october 21--26, 1999, 72 wild animals (37 mammals and 35 birds), comprised of 22 different species, were collected from a 24-ha area surrounding the fletc outdoor fir ... | 2001 | 11462145 |
| new species of the feather mite family proctophyllodidae (acariformes: astigmata) from two species of mockingbirds (passeriformes: mimidae) in eastern north america. | four new species of the feather mite family proctophyllodidae are described from two species of the family mimidae (passeriformes): proctophyllodes apanaskevichi sp. n. (proctophyllodinae) and amerodectes dumetellae sp. n. (pterodectinae) from the gray catbird, dumetella carolinensis (l., 1766), and proctophyllodes gallowayi sp. n. (proctophyllodinae) and metapterodectes toxostomae sp. n. (pterodectinae) from the brown thrasher, toxostoma rufum (l., 1758). a. dumetellae and m. toxostomae represe ... | 2014 | 24897846 |
| direct observation of syringeal muscle function in songbirds and a parrot. | the role of syringeal muscles in controlling the aperture of the avian vocal organ, the syrinx, was evaluated directly for the first time by observing and filming through an endoscope while electrically stimulating different muscle groups of anaesthetised birds. in songbirds (brown thrashers, toxostoma rufum, and cardinals, cardinalis cardinalis), direct observations of the biomechanical effects of contraction largely confirm the functions of the intrinsic syringeal muscles proposed from indirec ... | 2002 | 11818409 |
| tick infestations of birds in coastal georgia and alabama. | mist-netted birds were examined for ticks on jekyll island, glynn co., georgia (32 bird species) in 1996-1998, and at fort morgan, baldwin co., alabama (36 species) in 1998 during fall migration. sixty-two (14.7%) of 423 birds from jekyll island and 22 (13.3%) of 165 birds from fort morgan were infested with ticks. the mean number of ticks per infested bird was 2.0 on jekyll island and 6.3 at fort morgan. ten species of birds were infested with ticks on jekyl1 island where 87% of all ticks were ... | 2000 | 10780541 |
| borrelia burgdorferi in ticks (acari: ixodidae) from coastal virginia. | ixodid ticks removed from hosts and from vegetation during march-november 1987 at sites in coastal virginia and north carolina were examined for borrelia burgdorferi. b. burgdorferi was evident in nine (22%) ixodes cookei packard removed from rice rats (oryzomys palustris), a white-footed mouse (peromyscus leucopus), and raccoons (procyon lotor); four (6%) amblyomma americanum (l.) removed from raccoons; and two (3%) dermacentor variabilis (say) removed from a raccoon and a rice rat. b. burgdorf ... | 1991 | 1941936 |
| hemoprotozoa in mourning doves and other small birds of western oklahoma. | blood smears obtained from 370 birds live-trapped in western oklahoma were examined for hemoprotozoa. haemoproteus spp. were found in 189 (90.4%) mourning doves (zenaida macroura), one oriole (icterus galbula), two mockingbirds (mimus polyglottos), and three brown thrashers (toxostoma rufum). plasmodium sp. was present in one brown thrasher. haemoproteus spp. in the mourning dove were identified as h. sacharovi and h. maccallumi, with the latter species predominating. the average parasitemia for ... | 1975 | 811816 |
| motor stereotypy and diversity in songs of mimic thrushes. | the relationship between the motor and acoustic similarity of song was examined in brown thrashers (toxostoma rufum) and grey catbirds (dumetella carolinensis) (family mimidae), which have very large song repertoires and sometimes mimic other species. motor similarity was assessed by cross correlation of syringeal airflows and air sac pressures that accompany sound production. although most syllables were sung only once in the song analyzed, some were repeated, either immediately forming a coupl ... | 1996 | 8738752 |
| new records of ixodes affinis (acari: ixodidae) parasitizing avian hosts in southeastern virginia. | ixodes affinis neumann (acari: ixodidae) is a hard-bodied tick species distributed throughout much of the southeastern united states. although i. affinis does not parasitize humans, it is a competent vector of borrelia burgdorferi sensu stricto, the causative-agent of lyme disease, and thus contributes to the enzootic maintenance of this pathogen. this study presents evidence of i. affinis parasitizing five new host passerine species. during 2012-2014, 1,888 birds were captured and examined for ... | 2016 | 26586535 |
| exploring environmental coverages of species: a new variable contribution estimation methodology for rulesets from the genetic algorithm for rule-set prediction. | variable contribution estimation for, and determination of variable importance within, ecological niche models (enms) remain an important area of research with continuing challenges. most enm algorithms provide normally exhaustive searches through variable space; however, selecting variables to include in models is a first challenge. the estimation of the explanatory power of variables and the selection of the most appropriate variable set within models can be a second challenge. although some e ... | 2020 | 32440371 |
| role of syringeal muscles in gating airflow and sound production in singing brown thrashers. | 1. the role of syringeal muscles in song production, particularly in regulating airflow through the syrinx, was studied in singing brown thrashers (toxostoma rufum). in nine individuals, muscle activity was recorded electromyographically together with bilateral syringeal airflow, subsyringeal air sac pressure, and vocal output. 2. dorsal muscles, m. syringealis dorsalis (ds) and m. tracheolateral dorsalis (dtb), are consistently activated during ipsilateral closing of the syrinx or increasing sy ... | 1996 | 8714659 |
| role of syringeal muscles in controlling the phonology of bird song. | 1. the contribution of syringeal muscles to controlling the phonology of song was studied by recording bilateral airflow, subsyringeal air sac pressure, electromyograms (emgs) of six syringeal muscles, and vocal output in spontaneously singing brown thrashers (toxostoma rufum). 2. emg activity in musculus syringealis ventralis (vs), the largest syringeal muscle, increases exponentially with the fundamental frequency of the ipsilaterally generated sound and closely parallels frequency modulation. ... | 1996 | 8836225 |
| motor dynamics of song production by mimic thrushes. | in brown thrashers (toxostoma rufum) and grey catbirds (dumetella carolinensis) neither side of the syrinx has a consistently dominant role in song production. during song, the two sides operate independently, but in close cooperation with each other and with the respiratory muscles which are capable of adjusting expiratory effort to maintain a constant rate of syringeal airflow despite sudden changes in syringeal resistance. phonation is frequently switched from one side of the syrinx to the ot ... | 1994 | 7964705 |
| chemical defense in the plant bug lopidea robiniae (uhler). | secretions from the metathoracic glands (mtg) of the black locust bug, lopidea robiniae (uhler) (heteroptera: miridae) contained six major compounds, including (e)-2-hexenal, (e)-2-hexen-1-ol, (e)-2-octenal, (e)-2-octen-1-ol (e)-2-heptenal, and (z)-3-octen-1-ol. males and females did not differ significantly in the relative compositions of identified compounds. in feeding trials, six bird species [robin (turdus migratorious), blue jay (cyanocitta cristata), brown thrasher (toxostoma rufum), kill ... | 2002 | 11944836 |