| anatomy of the avian cecum. | the gross anatomy of the avian ceca is reviewed. in most birds, right and left ceca arise laterally or ventrolaterally at the junction of the small and large intestines. in a few species, the ceca open into the rectum ventrally or dorsally. in many herons and bitterns, only one cecum is present, and in the secretary bird there are two pairs of ceca. ceca are absent in woodpeckers, hummingbirds, swifts, kingfishers, pigeons, mousebirds, cuckoos, and parrots. ceca may be classified according to le ... | 1989 | 2575123 |
| [nematoda of the gastrointestinal system of gavia stellata and gavia arctica (gaviidae)]. | four species of nematoda: capillaria mergi, contracaecum rudolphii, paracuaria tridentata, stegophorus stellaepolaris were detected for the first time in poland in two red-throated divers (g. stellata). species p. tridentata and s. stellaepolaris appeared to be new for the polish fauna. in turn black-throated diver (g. arctica) is a new host to c. mergi. | 1989 | 2718469 |
| [trematoda of birds of lower silesia. ii. trematoda of the digestive tract of the red-throated diver (gavia stellata pont.)]. | | 1984 | 6531931 |
| [syngamus trachea (mont. 1811) chapin 1925 found in gavia stellata (pont. 1763)]. | | 1981 | 7199786 |
| perfluorinated compounds in some terrestrial and aquatic wildlife species from poland. | perfluorooctanesulfonate (pfos) at 1.6-39 ng/g ww and 4.8-200 pg/ml, respectively, perfluorooctanoate (pfoa) at 0.06-0.28 ng/g ww and<0.05-1.8 pg/ml, and perfluorodecanoate (pfda) at 0.13-0.57 ng/g ww and 0.05-1.8 pg/ml, were detected in all specimens of european beaver's (castor fiber) liver as well as in whole blood of cod (gadus morhua), velvet scoter (melanitta fusca), eider duck (sommateria mollisima), long-tailed duck (clangula hyemalis), razorbill (alca torda), red-throated diver (gavia s ... | 2007 | 17473997 |
| [intestinal digeneans of gavia stellata (pontoppidan, 1763) and gavia arctica (linnaeus, 1758) from west pomerania, poland]. | in 2000 and 2006 a total of 20 divers including 15 gavia stellata and 5 gavia artica from pomeranian bay and szczecin lagoon were examined. g. stellata were found to be infected with 3 digenean species: stephanoprora pseudoechinata (olsson, 1876), cryptocotyle concava (creplin, 1825) and diplostomum gavium (guberlet, 1922). g. arctica were host to echinochasmus spinulosus (rudolphi, 1809). this is the first record of stephanoprora pseudoechinata in g. stellata and echinochasmus spinulosus in g. ... | 2008 | 19338230 |
| new records of digenean flukes (trematoda) in birds in poland. | eleven new records of digenean species are reported in birds in poland, i.e. tylodelphys immer found in gavia stellata, strigea vanderbrokae in pernis apivorus, echinostoma academica in numenius arquata, echinochasmus euryporus in buteo buteo, patagifer parvispinosus and petasiger grandivesicularis in tachybaptus ruficollis, notocotyloides petasatus in calidris alpina, plagiorchis arcuatus in corvus cornix, leyogonimus polyoon in gallinula chloropus and fulica atra, lyperosomum alaudae in sylvia ... | 2010 | 20450011 |
| red-throated loons (gavia stellata) breeding in alaska, usa, are exposed to pcbs while on their asian wintering grounds. | red-throated loons (gavia stellata) breeding in alaska declined 53% during 1977-1993. we compare concentrations of environmental contaminants in red-throated loons among four nesting areas in alaska and discuss potential ramifications of exposure on reproductive success and population trends. eggs from the four areas had similar total polychlorinated biphenyl (pcb) concentrations, but eggs from the arctic coastal plain had different congener profiles and greater toxic equivalents (teqs) than egg ... | 2013 | 19371988 |
| international migration patterns of red-throated loons (gavia stellata) from four breeding populations in alaska. | identifying post-breeding migration and wintering distributions of migratory birds is important for understanding factors that may drive population dynamics. red-throated loons (gavia stellata) are widely distributed across alaska and currently have varying population trends, including some populations with recent periods of decline. to investigate population differentiation and the location of migration pathways and wintering areas, which may inform population trend patterns, we used satellite ... | 2018 | 29320572 |
| operational offshore wind farms and associated ship traffic cause profound changes in distribution patterns of loons (gavia spp.). | seabirds select suitable habitats at sea, but these habitats may be strongly impacted by marine spatial planning, including the construction of offshore wind farms (owfs) and the associated ship traffic. loons (gavia spp.) are particularly vulnerable to anthropogenic activities and are also of high conservation status, making them particularly relevant to marine planning processes. we investigated the effects of owf construction and ship traffic on loon distributions in the german north sea on a ... | 2019 | 30368153 |
| serologic evidence for influenza a virus exposure in three loon species breeding in alaska, usa. | limited information exists about exposure to influenza a viruses (iavs) in many wild waterbird species, including loons. we analyzed serum samples from breeding adult pacific (gavia pacifica), red-throated (gavia stellata), and yellow-billed (gavia adamsii) loons sampled at three locations along the coast of alaska, us from 2008 to 2017 to gain a better understanding of the potential role loons play in iav ecology. we screened loon sera for iav antibodies using three tests-blocking enzyme-linked ... | 2019 | 30896365 |
| a novel approach for assessing effects of ship traffic on distributions and movements of seabirds. | marine habitats are nowadays strongly affected by human activities, while for many species the consequences of these impacts are still unclear. the red-throated diver (gavia stellata) has been reported to be sensitive to ship traffic and other anthropogenic pressures and is consequently of high conservation concern. we studied red-throated divers in the german bight (north sea) using satellite telemetry and digital aerial surveys with the aim of assessing effects of ship traffic on the distribut ... | 2019 | 31539703 |
| satellite telemetry and digital aerial surveys show strong displacement of red-throated divers (gavia stellata) from offshore wind farms. | expansion of offshore wind energy is vital for the reduction of co2 emissions. however, offshore wind farms may negatively impact the environment without proper planning. here we assess the robustness of the conclusions of earlier studies that the strictly protected red-throated diver, gavia stellata, is strongly displaced from wind farms in the german bight (north sea). we modelled the distribution of divers based on two independent data sets, digital aerial surveys and satellite telemetry, in ... | 2020 | 32907727 |
| restoration of common loons following the north cape oil spill, rhode island, usa. | oil spills are a widespread problem in the marine environment and can have extensive acute and chronic adverse impacts to resident and migratory biota. on 19 january 1996, the north cape oil tanker caught fire and grounded on the coast of rhode island resulting in the spill of 828,000 gal (3134 metric tonnes) of home heating oil. it resulted in the estimated death of nearly 2300 birds, including a projected 402 common loons (gavia immer) and 12 red-throated loons (gavia stellata). based on exist ... | 2019 | 31425983 |
| genomic insights into natural selection in the common loon (gavia immer): evidence for aquatic adaptation. | the common loon (gavia immer) is one of five species that comprise the avian order gaviiformes. loons are specialized divers, reaching depths up to 60 m while staying submerged for intervals up to three minutes. in this study we used comparative genomics to investigate the genetic basis of the common loon adaptations to its ecological niche. we used illumina short read dna sequence data from a female bird to produce a draft assembly of the common loon (gavia immer) genome. | 2018 | 29703132 |
| a comparison of auditory brainstem responses across diving bird species. | there is little biological data available for diving birds because many live in hard-to-study, remote habitats. only one species of diving bird, the black-footed penguin (spheniscus demersus), has been studied in respect to auditory capabilities (wever et al., proc natl acad sci usa 63:676-680, 1969). we, therefore, measured in-air auditory threshold in ten species of diving birds, using the auditory brainstem response (abr). the average audiogram obtained for each species followed the u-shape t ... | 2015 | 26156644 |
| host specificity and seasonality of helminth component communities in central european grebes (podicipediformes) and loons (gaviiformes). | structure and pattern of helminth component communities parasitizing grebes and loons are poorly understood. here we analyze the prevalence, intensity and diversity of helminths in 505 czech grebes (podiceps cristatus, podiceps nigricollis, tachybaptus ruficollis) and loons (gavia arctica, gavia stellata) collected between 1962 and 2014. the species richness of helminth component communities ranged from 31±8 (p. cristatus) to 50±4 (g. stellata) species, with helminth load similar in all five hos ... | 2015 | 26008120 |