Results 1 to 10 of about 83,565 (267)

Predominantly Terrestrial Foraging and Reproductive Gains From a High Trophic Level Diet in Roof‐Nesting Herring Gulls (Larus argentatus) [PDF]

open access: yesEcology and Evolution
Wild animal species often use human‐modified environments for foraging and reproduction, but this may require dietary diversification with fitness consequences.
Simon F. Allen   +11 more
doaj   +2 more sources

Identifying organic-rich layers and reconstructing trophic levels in the Dalichai Formation in north Damghan [PDF]

open access: yesJournal of Stratigraphy and Sedimentology Researches, 2023
The Dalichai Formation in the Ahvanu section, north of Damghan city, with a thickness of 78 meters, comprises alternations of bluish-gray marls and limestones.
Elahe Zarei
doaj   +1 more source

Trophic state assessment of optically diverse lakes using Sentinel-3-derived trophic level index

open access: yesInternational Journal of Applied Earth Observations and Geoinformation, 2022
An accurate estimation of trophic state of lakes with satellite remote sensing is a challenge due to the optical complexity and variability associated with inland waters. Match-up data from 393 sampling stations that has concurrent Sentinel-3 OLCI images
Hui Liu   +10 more
doaj   +1 more source

Understanding trophic structure variation in fish assemblages of subtropical shallow lakes: Combined effects of ecosystem size, productivity, and disturbance

open access: yesEcological Indicators, 2021
Global environmental change has altered biotic interactions in ecosystems. Trophic structure is a major characteristic of ecosystems, and understanding the factors determining trophic structure is thus important for predicting the response of ecological ...
Yintao Jia   +6 more
doaj   +1 more source

Gut contents and trophodynamics of riverine catfish Rita rita (Hamilton 1822) inhabiting Bangladesh waters

open access: yesEgyptian Journal of Aquatic Research, 2021
This study aimed to investigate the diet composition, potential food preferences, and trophodynamics (trophic level) of Riverine catfish Rita rita collected from the Surma River, Bangladesh. For this purpose, gut contents of 151 of R. rita were examined.
Nurnobi Nishad   +5 more
doaj   +1 more source

How directed is a directed network?

open access: yesRoyal Society Open Science, 2020
The trophic levels of nodes in directed networks can reveal their functional properties. Moreover, the trophic coherence of a network, defined in terms of trophic levels, is related to properties such as cycle structure, stability and percolation.
R. S. MacKay, S. Johnson, B. Sansom
doaj   +1 more source

Niche partitioning and the role of intraspecific niche variation in structuring a guild of generalist anurans [PDF]

open access: yesRoyal Society Open Science, 2017
Intra-population niche differences in generalist foragers have captured the interest of ecologists, because such individuality can have important ecological and evolutionary implications. Few researchers have investigated how these differences affect the
Carl S. Cloyed, Perri K. Eason
doaj   +1 more source

Trophic levels of Tidal and Non-Tidal Marshes of Southern Mesopotamia

open access: yesMaǧallaẗ al-baṣraẗ al-ʻulūm al-zirāʻiyyaẗ, 2020
Carlson’s Trophic State Index (CTSI) was applied to assess the trophic status of two kind of southern Mesopotima marshes. Six stations were selected, three in non-tidal Chebiyesh marshes and other three in tidal East Hammer marsh.
Najah A. Hussain, Amal A. Sabbar
doaj   +1 more source

The Canadian Beaufort Shelf trophic structure: evaluating an ecosystem modelling approach by comparison with observed stable isotopic structure1

open access: yesArctic Science, 2022
Climate-driven impacts on marine trophic pathways worldwide are compounded by sea-ice loss at northern latitudes. For the Arctic, current information describing food-web linkages is fragmented, and there is a need for tools that can describe overarching ...
C. Hoover   +9 more
doaj   +1 more source

Evaluation of Sustainable Utilization of African Marine Fishery Resources

open access: yesFishes, 2022
Sustainable utilization evaluation is the basis for ensuring the sustainable exploitation of fisheries’ resources. This paper explores the changes in the mean trophic level of African marine fish catches during a 70-year period based on the statistical ...
Mo Bi, Zhenke Zhang, Xinya Guo, Lei Wan
doaj   +1 more source

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