scholarly journals Foraging Decisions of Sandwich Terns in the Presence of Kleptoparasitising Gulls

The Auk ◽  
2002 ◽  
Vol 119 (2) ◽  
pp. 473-486
Author(s):  
Eric W. M. Stienen ◽  
Alex Brenninkmeijer
Keyword(s):  
Diet Composition ◽  
Prey Selection ◽  
Food Shortage ◽  
Larus Ridibundus ◽  
Foraging Decisions ◽  
Food Losses ◽  
Sterna Sandvicensis ◽  
The 1960S ◽  
Potential Food ◽  
Selection Of

AbstractWe studied prey selection of Sandwich Terns (Sterna sandvicensis) in the presence of kleptoparasitising Black-headed Gulls (Larus ridibundus) on Griend, Dutch Wadden Sea, from 1992 to 1998. Most often, gulls robbed larger sandeels rather than herring from terns. Provided that one parent attends the chick, energy intake would be too low for the chicks' survival if exclusively fed on sandeel. By provisioning an increasing proportion of herring, parent terns could theoretically overcome a potential food shortage when the chicks grow older. However, the proportion of herring did not increase with age of chicks in most years. Instead, parents increased their foraging effort with the growth of their offspring. In years with high proportions of food loss, parents left their chicks unattended at the nest more often. In that way, parents were largely able to counterbalance food shortage of offspring. In 1992 and 1996, when diet composition was unfavorable and food losses to gulls were high, parents left their chicks unattended at the nest for ∼80% of the daylight period. It is argued that the present working level of parents might be higher than in the 1960s.

Diet composition and prey selection of vendace Coregonus albula in the mesotrophic, temperate Lake Ostrowite (Northern Poland)

2008 ◽  
Vol 37 (1) ◽  
Author(s):  
Tomasz Kakareko ◽  
Paweł Napiórkowski ◽  
Jacek Kozłowski
Keyword(s):  
Diet Composition ◽  
Prey Selection ◽  
Temperate Lake ◽  
Coregonus Albula ◽  
Northern Poland ◽  
Mesotrophic Lake ◽  
Selection Of

Diet composition and prey selection of vendaceLake Ostrowite is a mesotrophic lake in Northern Poland 280.7 ha in area and 43 m deep at its deepest point. To study vendace (

Benefits of being a generalist carnivore when threatened by climate change: the comparative dietary ecology of two sympatric semelparous marsupials, including a new endangered species (Antechinus arktos)

2016 ◽  
Vol 64 (4) ◽  
pp. 249 ◽  
Author(s):  
Emma L. Gray ◽  
Chris J. Burwell ◽  
Andrew M. Baker
Keyword(s):  
Climate Change ◽  
National Park ◽  
Diet Composition ◽  
Prey Selection ◽  
Pitfall Traps ◽  
Dietary Ecology ◽  
Late 21St Century ◽  
Dietary Components ◽  
Abundance And Diversity ◽  
Selection Of

The endangered black-tailed dusky antechinus (Antechinus arktos) was described in 2014, so most aspects of its ecology are unknown. We examined diet composition and prey selection of A. arktos and a sympatric congener, the northern form of A. stuartii, at two sites in Springbrook National Park. Overall, taxa from 25 invertebrate orders were identified in the diets from 252 scat samples. Dietary components were similar for each species, but A. arktos consumed a higher frequency and volume of dipteran larvae and Diplopoda, while A. stuartii consumed more Coleoptera, Lepidoptera, Orthoptera and Isopoda. Both species of Antechinus had a higher percentage of ‘empty’ scats (devoid of any identifiable invertebrate material) in 2014 compared with 2015. The former was a drier year overall. Lower rainfall may have reduced abundance and diversity of arthropod prey, causing both species to supplement their diet with soft-bodied prey items such as earthworms, which are rarely detected in scats. Comparison of prey in scats with invertebrate captures from pitfall traps showed both species to be dietary generalists, despite exhibiting distinct preference and avoidance of certain prey categories. The ability of an endangered generalist marsupial to switch prey may be particularly advantageous considering the anticipated effects of climate change on Gondwanan rainforests during the mid-late 21st century.

Diet composition and prey selection of the pike,Esox lucius, in Çivril Lake, Turkey

2008 ◽  
Author(s):  
A. Alp ◽  
V. Yeğen ◽  
M. Apaydin Yağci ◽  
R. Uysal ◽  
E. Biçen ◽  
...  
Keyword(s):  
Diet Composition ◽  
Prey Selection ◽  
Esox Lucius ◽  
Pike Esox Lucius ◽  
Selection Of

scholarly journals Diet composition and prey selection of Telmatobius macrostomus, the Junín giant frog

2017 ◽  
Vol 32 ◽  
pp. 117-121 ◽  
Author(s):  
AS Watson ◽  
AL Fitzgerald ◽  
OJ Damián Baldeón
Keyword(s):  
Diet Composition ◽  
Prey Selection ◽  
Selection Of

The City of Oslo in Jan Erik Vold’s Poems

2021 ◽  
Vol 66 (1) ◽  
pp. 219-230
Author(s):  
Raluca-Daniela Duinea
Keyword(s):  
Cultural Identity ◽  
Urban Areas ◽  
Social Criticism ◽  
Capital City ◽  
Urban Landscapes ◽  
Reading Technique ◽  
Social Critical ◽  
The 1960S ◽  
The City ◽  
Selection Of

"The City of Oslo in Jan Erik Vold’s Poems. The aim of this paper is to examine, from a cultural and social perspective, the Norwegian urban areas and everyday situations in Jan Erik Vold’s (b. 1939) poems. Our close-reading technique reveals important social aspects, different places and streets, located in the capital city of Norway, Oslo. These urban poems written by the contemporary Norwegian poet Jan Erik Vold contribute to the reconstruction of a new Norwegian cultural identity as it is reflected in a selection of poems taken from Mor Godhjertas glade versjon. Ja (Mother Goodhearted’s Happy Version. Yes, 1968), followed by the poet’s wanderings in the city of Oslo in En som het Abel Ek (One Named Abel Ek, 1988), and concluding with his bitter social criticism in Elg (Moose, 1989) and IKKE. Skillingstrykk fra nittitallet (Not: Broadsides from the Nineties, 1993). Vold’s urban poems emphasise the transition from nyenkle (new simple), friendly and descriptive poems which present closely the city of Oslo on foot, to short, political and social critical poems from the 90s. Thus, it is of great importance to traverse various urban ‘landscapes’ in different periods of time, beginning with the 1960s, followed by the 80s and the 90s. Keywords: Jan Erik Vold, urban poems, social criticism, Norwegian urban areas, the city of Oslo "

scholarly journals Techno-morphological features of items made of antler from the site near the village of Michnievičy (north-western Belarus)

2019 ◽  
Vol 8 (4) ◽  
pp. 116-122
Author(s):  
Anna Andreevna Malyutina ◽  
Aleksandr Nikolaevich Vashanov ◽  
Mariya Ivanovna Tkacheva ◽  
Evgenia Sergeevna Tkach
Keyword(s):  
Morphological Analysis ◽  
Raw Materials ◽  
Morphological Features ◽  
National Academy Of Sciences ◽  
History Of ◽  
The 1960S ◽  
Academy Of Sciences ◽  
The Village ◽  
North Western ◽  
Selection Of

The paper presents the results of a techno-morphological analysis of items made of antler obtained as a result of the collections from the 1960s-1990s from the site near the village of Michnievičy Smorgon District of the Grodno Region (north-western Belarus). Currently, more than 100 artifacts are known from this site, as well as a large number of fauna residues with no visible traces of processing. Radiocarbon dating was obtained for some categories of products, which link them to 9-2 thousand BC. The largest part of the collection refers to the period of the Mesolithic - Neolithic. At the first stage of work, the most expressive and numerous group of artifacts made of horn (24 exemplars), stored in the fonds of the Institute of History of the National Academy of Sciences of Belarus, was selected for a techno-morphological analysis. The degree of preservation of the external surface of objects is relatively good, which made it possible to analyze macro-traces related to the technology of manufacturing various categories of products, on the basis of which a process flow was proposed - from the selection of raw materials to the finished product. The analysis of the technological traces recorded on the products allowed us to highlight the differences in the manufacturing processes of the oldest tools. In addition, on the basis of the macro signs of utilitarian wear, preliminary observations on the functional using of objects were obtained. According to technological and morphological features, the whole of the analyzed material was divided into conditional categories of instruments with a selected heel and without it. The presence or absence of this element, apparently, influenced the method of using objects in various household situations.

scholarly journals FEEDING AND REPRODUCTIVE ACTIVITY OF THE COPEPODS Drepanopus forcipatus AND Calanus australis DURING LATE SUMMER ON THE SOUTHERN PATAGONIAN SHELF (ARGENTINA, 47°-55°S)

2014 ◽  
Vol 62 (4) ◽  
pp. 295-314 ◽  
Author(s):  
Julieta Carolina Antacli ◽  
Marina E. Sabatini ◽  
Ricardo I. Silva ◽  
Daniel R. Hernández ◽  
Andrés J. Jaureguizar ◽  
...  
Keyword(s):  
Diet Composition ◽  
Feeding Activity ◽  
Food Pellet ◽  
Late Summer ◽  
Reproductive Activity ◽  
Seasonal Temperature ◽  
Patagonian Shelf ◽  
Adult Females ◽  
Female Reproductive Status ◽  
Potential Food

Drepanopus forcipatus and Calanus australis are key planktonic copepods on the southern Patagonian shelf. Their feeding and reproductive patterns and population status were investigated during late summer, when environmental conditions may be critical. The presence of food in the gut and food-pellet length were recorded in adult females and the most abundant copepodite stages. Diet composition was also studied in adult females. Female reproductive status was evaluated by gonad staging. Despite generally low feeding conditions and decreasing seasonal temperature, both copepods fed to some degree. The most numerous copepodites and adult females of both species showed similarly low feeding activity. About half of the adult females of the two species and C5s of C. australis contained food in their guts, but the proportion of fed C4-females of D. forcipatus was much lower. All copepods were generally feeding at low or intermediate levels. Gonad stage distribution and population structure showed low but still ongoing reproduction in both species. Gut content findings suggest a preference for smaller nanoplanktonic particles, especially dinoflagellates by D. forcipatus, and for autotrophic prey, particularly large diatoms by C. australis. The feeding and reproduction patterns of the two copepods were likely influenced by the distributions of potential food resources and temperature.

scholarly journals Prey species and prey selection of dholes at three different sites in Thailand

2020 ◽  
Vol 21 (11) ◽  
Author(s):  
KHWANRUTAI CHARASPET ◽  
Ronglarp - Sukmasuang ◽  
NORASET KHOEWSREE ◽  
MANANYA PLA-ARD ◽  
YUWALUK CHANACHAI
Keyword(s):  
National Park ◽  
Prey Species ◽  
Dietary Diversity ◽  
Prey Selection ◽  
Selection Index ◽  
Camera Traps ◽  
Total Biomass ◽  
Wildlife Sanctuary ◽  
Khao Yai National Park ◽  
Selection Of

Abstract. Charaspet K, Sukmasuang R, Khoewsree N, Pla-ard M, Chanachai Y. 2020. Prey species and prey selection of dholes at three different sites in Thailand. Biodiversitas 21: 5248-5262. The study of prey species and prey selection of Dholes at 3 different sites was conducted at Khao Yai National Park, Salak Pra, and Huai Kha Khaeng Wildlife Sanctuaries from 2013 to 2020. Information on Dhole prey at the sites was collected from the residues of dhole scats, from which the selection index, the relative biomass of the prey, and the relative amounts of the consumed prey were calculated. The data were collected simultaneously with the use of camera traps at each site. The study revealed that there were 13 species of Dhole prey with body weight over 5 kg. The result indicated that there were 7 species of even-toed ungulates. The relative biomass of even-toed ungulates ranged between 76.78 - 90.50% of the total biomass of all the Dholes’ consumed prey for all study sites. The dietary diversity index unveiled a similar index in all areas, which proved the adequacy of the analyzed scats. However, the Niche breadth index, which indicates the relevance of prey selection and prey species to the appearances of the prey at each site, was found to be high at Huai Kha Khaeng Wildlife Sanctuary, Khao Yai National Park, while the index was found to be low at Salak Pra Wildlife Sanctuary. The results revealed that Dholes consumed viverrid species and Malayan porcupine more often at the site where there were large carnivores. The recommendation from this study was the conservation and restoration of the ungulate populations, the main prey, as it greatly affects the conservation of the Dhole populations in Thailand.  Grassland and salt lick sites, water sources improvements are also important to promote prey population. The conservation of wildlife prey by releasing them to nature, as currently conducted, has an effect on the increase of Dholes’ prey species.

scholarly journals Intrinsic Prey Preference and Selection of the Giant Gartersnake: A Threatened Predator in a Nonnative Prey-Dominated Community

2020 ◽  
Vol 11 (1) ◽  
pp. 164-173
Author(s):  
Julia S.M. Ersan ◽  
Brian J. Halstead ◽  
Erica L. Wildy ◽  
Michael L. Casazza ◽  
Glenn D. Wylie
Keyword(s):  
Exotic Species ◽  
Native Species ◽  
Prey Selection ◽  
Central Valley ◽  
Prey Preference ◽  
Live Prey ◽  
Species Of Conservation Concern ◽  
Conservation Concern ◽  
Behavioral Trials ◽  
Selection Of

Abstract The introduction of exotic species into an environment can introduce great change in the trophic dynamics of native species. This is of even greater concern if the native species is of conservation concern. The giant gartersnake, Thamnophis gigas, an endemic predator of the Central Valley of California and a species of conservation concern at the state and federal levels, has declined as a result of conversion of its once vast wetland habitat to agriculture. Another anthropogenic factor contributing to this snake's changing ecology is the introduction of nonnative prey into the species' habitats. These introductions have resulted in a prey community that is almost completely composed of exotic species and have potential for considerable effects. In order to assess prey preference and selection we performed three sets of behavioral trials on naïve neonates. We examined 1) neonate prey preference in response to olfactory cues of prepared prey extracts, 2) neonate consumption of different live prey items presented simultaneously; and 3) terrestrial feeding behavior and/or latency to successful attack. Results from the olfactory study suggest that native Sierran treefrogs, Pseudacris sierra, are preferred by neonates. Results from consumption trials suggest that neonates are more likely to select frog species than fish species. This is the first study that we are aware of that examines prey selection of this threatened species and serves to inform its conservation and management.

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