Temat: feeding rate - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Sex-specific growth is mirrored in feeding rate but not moulting frequency in a sexually dimorphic snake
Autorzy:: Bury, Stanisław
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Light affects parental provisioning behaviour in a cavity‐nesting Passerine
Autorzy:: Surmacki, Adrian
Podkowa, Paweł
Malinowska, Katarzyna
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Spirostomum teres: A Long Term Study of an Anoxic-Hypolimnion Population Feeding upon Photosynthesizing Microorganisms
Autorzy:: Macek, Miroslav
Sánchez Medina, Ximena
Picazo, Antonio
Peštová, Dana
Bautista Reyes, Fernando
Montiel Hernández, Jorge Ricardo
Alcocer, Javier
Merino Ibarra, Martín
Camacho, Antonio
Tematy:: Spirostomum teres
ciliate
population dynamics
maar lake
anoxic hypolimnion
picocyanobacteria
feeding rate; Pokaż więcej
Wydawca:: Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:: https://bibliotekanauki.pl/articles/52089923.pdf Link otwiera się w nowym oknie
Opis:: The pelagic / anoxic hypolimnion population of Spirostomum teres was investigated as a part of the long-term ciliates’ monitoring (2003–2016) in an oligo- to mesotrophic monomictic hyposaline crater lake Alchichica (Puebla / Veracruz, Mexico), including an analysis of picoplankton (both heterotrophic, HPP and autotrophic, APP) and inorganic compounds of nitrogen (ammonium, nitrite, nitrate), phosphorus (dissolved reactive phosphorus, DRP) and silicon. Additionally, detailed studies of the ciliate vertical distribution and feeding activity measured upon fluorescently labelled APP (picocyanobacteria) were carried out. The results were compared with those from a neighbour freshwater crater lake La Preciosa and with a meromictic karstic lake La Cruz (Cuenca, Spain). The ciliate vertical distribution within the water column was very well defined: During the first decade, the benthic population was frequently found throughout a developing stratification of the lake. The established stratification of the lake turned the conditions favourable for the formation of an oxycline / hypolimnion population, typically, several meters below the deep chlorophyll maximum (formed basically by diatoms); the population preferred the layers without detectable dissolved oxygen. However, an observed gradient of light (PAR) could support both oxygenic and anoxygenic photosynthesis. Late stratification after deepening of the thermocline reduced the layers with S. teres population to a minimum apparently due to the drastic change in physicochemical conditions within a metalimnion, coupled with an oxycline, and limited to 1 to 2 meters; microstratification was found. Last years, the very bottom population disappeared or it was reduced and the late stratification S. teres peaks were smaller or did not appeared. Generally, S. teres oxycline / anoxic hypolimnion population was observed from June through November. Optimum picoplankton numbers in conditions that supported the ciliate growth were found: The ciliate was peaking at APP of 0.6 to 1 × 10⁵ cells mL^–1; the optimum of HPP was observed round 1.4 × 10⁶ cells mL^–1. S. teres was efficiently feeding upon picocyanobacteria in numbers of 10⁵ cells mL^–1 reaching the clearance rate of 2000 nL cell^–1h^–1, which represented in average 130 to 210 cells cell^–1h^–1 ingested. Feeding upon purple sulphur bacteria was observed but only during the end of the lake stable stratification when the ciliate population was already dropping. On the other hand, the volume specific clearance of S. teres upon picocyanobacteria (10³ h^–1) did not support the hypothesis that they could serve as a sole prey. Feeding upon eukaryote phytoplankton (chlorophytes Monoraphidium minutum, diatoms Cyclotella choc tawhatcheeana) could be of higher importance that previously supposed. Additionally, a use of ingested and retained photosynthetic prokaryotes is hypothesized.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: The influence of microplastics on the activity of microorganisms and soil mesofauna
Wpływ mikroplastiku na aktywność mikroorganizmów i mezofauny glebowej
Autorzy:: Grzyb, Daniel
Opis:: Negatywne oddziaływanie mikroplastiku na środowisko i organizmy żywe jest problemem coraz częściej poruszanym w badaniach naukowych. W niniejszej pracy w eksperymencie laboratoryjnym badano wpływ mikroplastiku na funkcjonowanie gleby. Do trzech gleb o zróżnicowanych właściwościach dodano mikroplastik o wielkości cząstek 0,05mm lub 0,15mm (plus kontrole). Po dwóch tygodniach inkubacji zmierzono tempo respiracji gleby metodą miareczkowania alkacymetrycznego oraz zbadano aktywność żerowania mezofauny glebowej przy użyciu pasków bait lamina. Dodatek mikroplastiku nie wpłynął jednoznacznie na tempo respiracji badanych gleb, natomiast w znacznym stopniu wpłynął na aktywność mezofauny glebowej, która była wyższa w glebach z dodatkiem mikroplastiku 0,05mm. Wyjaśnienie mechanizmu tego zjawiska wymaga dalszych szczegółowych badań.
Negative effect of microplastic is a problem increasingly discussed in environmental studies. In a current effect of microplastic on soil functioning was studied in a laboratory experiment. For this purpose, three soil of contrasting properties were collected and microplastic of particle size 0.05 mm or 0.15 mm was added to the soils (plus controls). After two weeks of incubation, soil respiration rate was measured by acid-base titration and mesofauna feeding activity was measured with the bait lamina strips. The microplastic addition have no clear effect on the soil respiration rate, whereas resulted in increased the feeding activity of soil microorganisms, which was higher in soils with the addition of microplastic 0.05mm. Explanation of this phenomenon needs for further research.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

na półce

Informacja

Wyszukujesz frazę "feeding rate" wg kryterium: Temat