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    Tytuł:
    Feeding ecology of sprat (Sprattus sprattus L.) and sardine (Sardina pilchardus W.) larvae in the German Bight, North Sea
    Autorzy:
    Voss, R.
    Dickmann, M.
    Schmidt, J.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/47806.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    German Bight
    sprat
    coexistence
    Sprattus sprattus
    North Sea
    habitat preference
    food competition
    Sardina pilchardus
    larva
    sardine
    feeding ecology
    Opis:
    The abundance of the sardine in the North Sea suddenly increased after 1995. Since 2002, the sardine has been spawning regularly in the German Bight, and all its life stages can be found in the area. The larval feeding ecology of two small pelagic clupeiform species with very similar life histories was investigated, the particular aim being to determine signs of food overlap. The distribution and feeding of sprat and sardine larvae were investigated during late spring 2003 on two transects covering a wide range of environmental conditions in the German Bight. Larvae co-occurred at all the stations investigated. Sprat and sardine larvae shared a wide range of prey types. Gut fullness and feeding success were similar in both species; however, potential food competition is avoided to some extent by different habitat preferences.
    Źródło:
    Oceanologia; 2009, 51, 1; 117-138
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feeding ecology of the American crab Rhithropanopeus harrisii (Crustacea, Decapoda) in the coastal waters of the Baltic Sea
    Autorzy:
    Hegele-Drywa, J.
    Normant, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/47763.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Rhithropanopeus harrisii
    stomach content
    Baltic Sea
    Crustacea
    brackish water
    coastal water
    non-native species
    Decapoda
    feeding ecology
    American crab
    Opis:
    The feeding ecology of the American crab Rhithropanopeus harrisii Gould, 1841 from brackish waters of the Baltic Sea was studied by analyses of the stomach repletion index (SRI) and stomach content with regard to sex, size and habitat (Dead Vistula River and the Gulf of Gdańsk). Neither the sex nor the size of an individual crab had a significant (P>0.05) influence on the SRI or on the diversity of food items found in the stomachs of R. harrisii. But the type of food consumed was significantly (P<0.05) dependent on the locality inhabited: the greater the biodiversity of the habitat, the richer the dietary composition. In Baltic coastal waters this species feeds on detritus, and also on animal and plant matter. Remains of Chlorophyta, Amphipoda, Ostracoda, Polychaeta, Gastropoda and Bivalvia were found in the stomachs of the specimens analysed.
    Źródło:
    Oceanologia; 2009, 51, 3; 361-375
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Macroevolutionary and morphofunctional patterns in theropod skulls: A morphometric approach
    Autorzy:
    Foth, C.
    Rauhut, O.W.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21033.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    macroevolution
    theropod dinosaur
    skull
    Theropoda
    feeding ecology
    biomechanics
    evolution
    Mesozoic
    paleontology
    Opis:
    Theropod dinosaurs are one of the most remarkable lineages of terrestrial vertebrates in the Mesozoic, showing high taxo− nomic and ecological diversity. We investigate the cranial diversity of non−avian theropods and some basal birds, using geometric morphometrics to obtain insights into the evolutionary modifications of the skull. Theropod skulls mostly vary in the shape of the snout and length of the postorbital region (principal component [PC] 1), with further variation in orbit shape, depth of the postorbital region, and position of the jaw joint (PC 2 and PC 3). These results indicate that the cranial shape of theropods is closely correlated with phylogeny and dietary preference. Skull shapes of non−carnivorous taxa dif− fer significantly from carnivorous taxa, suggesting that dietary preference affects skull shape. Furthermore, we found a significant correlation between the first three PC axes and functional proxies (average maximum stress and an indicator of skull strength). Interestingly, basal birds occupy a large area within the morphospace, indicating a high cranial, and thus also ecological, diversity. However, we could include only a small number of basal avialan species, because their skulls are fragile and there are few good skull reconstructions. Taking the known diversity of basal birds from the Jehol biota into account, the present result might even underestimate the morphological diversity of basal avialans.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proces usamodzielniania się śledzonych telemetrycznie bielików Haliaeetus albicilla z Parku Narodowego „Bory Tucholskie” w okresie post-pisklęcym
    The process of becoming independent in the post-fledling period of the telemetry tracked White-tailed Eagles Haliaeetus albicilla from the “Bory Tucholskie” National Park
    Autorzy:
    Anderwald, Dariusz
    Lubińska, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/16728959.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    White-tailed Eagle
    Bory Tucholskie National Park
    telemetry research
    GPS loggers
    spatial ecology
    large chicks
    feeding grounds
    exploration flights
    dispersion
    bielik
    Park Narodowy Bory Tucholskie
    badania telemetryczne
    rejestratory GPS
    ekologia przestrzenn
    duże pisklęta
    loty na żerowiska
    loty eksploracyjne
    dyspersja
    Opis:
    In 2019-2020, as part of the research on the spatial ecology of the White-tailed Eagle in the “Bory Tucholskie” National Park (PNBT), 4 GPS loggers were given to large chicks. In 2019, chicks from two different nests were equipped with these devices, and in 2020, another two chicks from the same nests. It has been shown that the dispersion of juvenile White-tailed Eagles is preceded by a preparation period lasting several weeks, during which large chicks go through several characteristic stages: weakly volatile pod flying on the branches, short training flights outside the nest, directed flights to the feeding grounds (<3 km) and long-distance (>3 km) exploration flights. The first flights of the examined individuals outside the nest area were made between the 6th and 13th July, while the first flights to the feeding grounds occurred between the 28th July and 7th August. All tracked individuals began longer exploratory flights (N=64, X=16), with a maximum distance of 43.2 km from the nest (X=11.76 km, Me=10.01 km) between the 9th August and 1st September. In both years of study, the young birds from the same breeding area left the nest and its surroundings in the third week of August and moved 1,300 m to the NE, to the peninsula of the main lake in the Park. Juvenile White-tailed Eagles from the “Bory Tucholskie” National Park began their independence period between the 5th and 22nd October. During the first 30 days from the moment of leaving the breeding area, juveniles left the Park in various directions travelling for distances of 39-80 km, using strategies of abrupt displacement and nomadism, gradually exploring the feeding grounds.
    Źródło:
    Leśne Prace Badawcze; 2021, 82, 4; 131-142
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scrutinizing Barremian coprolite inclusions to record digestive strategies
    Autorzy:
    Barrios-de Pedro, S.
    Buscalioni, Á. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/191206.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Cretaceous
    Las Hoyas
    lacustrine
    taphonomy
    digestive process
    feeding ecology
    Opis:
    The exceptional preservation of the Las Hoyas coprolites allows the taphonomic study of inclusions on twelve morphotypes and twenty-three specimens. Non-destructive techniques were applied to study the digestion features (pitting, corrosion lines, shape of the fractures at the ends) and the arrangement, number, and size of inelusions. An analysis based on non-metric, multidimensional scaling ordination identified the similarities among the inclusion features and morphotypes. The morphotypes are clustered on the basis of the way of ingestion and the digestive process. The authors recognize three digestive strategies for the Las Hoyas coprolites: (1) ingestion of prey with limited processing in the mouth, scarce to less effective acid secretions, and/or defecation in a short period of time; (2) ingestion of the prey with mastication prior to deglutition, and defecation over a longer period of time; (3) mastication and long retention time of food in the digestive system with more effective acid secretions. This study is a first step in the understanding of the feeding ecology of the Las Hoyas Barremian lentic ecosystem, based on coprolites.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 2; 203-221
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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