Results 91 to 100 of about 248,109 (208)

Testing peat humification analysis in an Australian context: identifying wet shifts in regional climate over the past 4000 years [PDF]

open access: yesMires and Peat, 2014
Peat humification analysis is presented as a robust palaeoclimatic proxy, suitable for use on mid–late Holocene peat sequences situated in the Southern Hemisphere.
M.A. Burrows, J. Fenner, S.G. Haberle
doaj  

The dose makes the poison: have “field realistic” rates of exposure of bees to neonicotinoid insecticides been overestimated in laboratory studies? [PDF]

open access: yes, 2014
Recent laboratory based studies have demonstrated adverse sub-lethal effects of neonicotinoid insecticides on honey bees and bumble bees, and these studies have been influential in leading to a European Union moratorium on the use of three neonicotinoids,
BARON G L   +16 more
core   +1 more source

The Late Glacial and Holocene development of vegetation in the area of a fossil lake in the Skaliska Basin (north-eastern Poland) inferred from pollen analysis and radiocarbon dating

open access: yesActa Palaeobotanica, 2013
The development of vegetation in the Skaliska Basin has been reconstructed on the basis of palynological analysis and radiocarbon dating (AMS technique) of 6 sites from the late phase of the Bolling- Allerod interstadial complex to modern times. Although
Kołaczek Piotr   +7 more
doaj   +1 more source

The palynological record of the Eemian interglacial and Early Vistulian glaciation in deposits of the Żabieniec Południowy fossil basin (Łódź Plateau, central Poland), and its palaeogeographic significance

open access: yesActa Palaeobotanica, 2014
The vegetation of the Eemian interglacial and Early Vistulian glaciation was reconstructed on the basis of pollen analysis, biogenic and mineral-biogenic sediments from the Żabieniec Południowy locality.
Majecka Aleksandra
doaj   +1 more source

Cumulative individual seed production in the polycarpic Caesalpinia gilliesii (Fabaceae): effects of temporal variability in floral display, plant density and pollination [PDF]

open access: yes, 2016
In polycarpic species, floral display size and density of conspecific neighbours are time variable as well as their effects on pollination and fecundity.
Ashworth, Lorena   +2 more
core  

Floodplain environmental change during the younger dryas and holocene: Evidence from the lower kennet valley, south central England [PDF]

open access: yes, 2006
Many lowland rivers across northwest Europe exhibit broadly similar behavioural responses to glacial-interglacial transitions and landscape development. Difficulties exist in assessing these, largely because the evidence from many rivers remains limited
Collins, PEF   +3 more
core  

Pollination patterns in safflower (Carthamus tinctorius L.) : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science in Plant Science at Massey University [PDF]

open access: yes, 1981
The influence of environmental conditions on safflower (Carthamus tinctorius L.) floret characters and insects were studied in relation to pollination in this species.
Woods, Peter William
core  

Influence of Geological and Soil Factors on Pine, Birch, and Alder Stability During the Holocene Climate Change in Central Latvia, Northeastern Europe

open access: yesQuaternary
Understanding the past dynamics of vegetation in response to climate change is crucial for predicting future ecological outcomes. This study has two primary objectives: (1) to reconstruct the vegetation history of the coastal region around Lake Lilaste ...
Normunds Stivrins, Marianna Jarmakovica
doaj   +1 more source

The limitations of the methods of identifying the floral source of honeys [PDF]

open access: yes, 1998
The pollen grains in honey reveal the types of plants that were around when the bees produced the honey, thus it is valid to use melissopalynology to determine the geographical origin of honeys, but there are several reasons why it is less valid for ...
Molan, Peter C.
core   +1 more source

Morphological and immunochemical characterization of the pollen grains of Chenopodium album L. (Chenopodiaceae) in a temperate urban area in Argentina [PDF]

open access: yes, 2014
Chenopodium album es una hierba cosmopolita, anual, muy polimórfica, que crece en forma espontánea en baldíos con suelos modificados de los barrios periféricos de Bahía Blanca.
Aztiria, María Eugenia   +5 more
core  

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