scholarly journals Oligolectisme et décalage phénologique entre plante hôte et pollinisateur : étude de deux espèces printanières psammophiles, Colletes cunicularius (L.) (Hymenoptera, Colletidae) et Andrena vaga (Panzer) (Hymenoptera, Andrenidae)

Osmia ◽  
2009 ◽  
Vol 3 ◽  
pp. 23-27
Author(s):  
Maryse Vanderplanck ◽  
Étienne Bruneau ◽  
Denis Michez
Keyword(s):  
Host Plant ◽  
Microscopic Analysis ◽  
Early Spring ◽  
Plant Association ◽  
Pollen Loads ◽  
Pollen Types ◽  
Plante Hôte ◽  
Two Populations ◽  
Ground Nesting ◽  
Phenological Shift

Oligolectism and phenological shift between host plant and pollinator: study of two psammophilic spring species, Colletes cunicularius (L.) (Hymenoptera, Colletidae) and Andrena vaga (Panzer) (Hymenoptera, Andrenidae). - Colletes cunicularius (L.) and Andrena vaga (Panzer), both vernal solitary ground nesting bees, have been reported to feed strictly on Salix (Salicaceae) (oligolectic behavior). However a recent study has shown that Colletes cunicularius is able to shift on different plants, at least in the studied sites in Germany. In this study we investigated the extent to which this behavior applies to other regions within the distribution range of these bee species. We analysed the host-plant association of two populations in Belgium. Pollen loads and brood cells of both species have been investigated by optical microscopic analysis to estimate the proportion of willow pollen. Andrena vaga females collect pollen only on Salix but pollen loads of Colletes cunicularius sometimes contain other pollen types in agreement with a previously study. It is observed that the first nest cells made by C. cunicularius in early spring contain exclusively willow pollen. Towards the end of willow blooming, Colletes cunicularius females change their floral choice by foraging on other pollen types.

scholarly journals Pollen sources in the Bojanów forest complex identified on honeybee pollen load by microscopic analysis

2017 ◽  
Vol 70 (4) ◽  
Author(s):  
Ernest Stawiarz ◽  
Beata Żuraw ◽  
Agnieszka Marut
Keyword(s):  
Trifolium Repens ◽  
Robinia Pseudoacacia ◽  
Microscopic Analysis ◽  
Pollen Grains ◽  
Early Spring ◽  
Pollen Load ◽  
Pollen Loads ◽  
Pollinating Insects ◽  
Pollen Traps ◽  
Plant Families

<p>The aim of this study was to determine sources of pollen for the honeybee in the Bojanów forest complex, Nowa Dęba Forest District (southeastern Poland). Sampling of pollen loads from bees extended from the beginning of May until the end of September 2016 and was carried out at 7-day intervals using pollen traps mounted at the entrance of beehives. A total of 73 pollen load samples were collected from the study area.</p><p>Fifty-nine taxa from 31 plant families were identified in the analyzed material. From 4 to 21 taxa (average 9.5) were recorded in one sample. The pollen of Brassicaceae (“others”), <em>Taraxacum</em> type, <em>Solidago</em> type, and <em>Rumex</em> had the highest frequency in the pollen loads examined. Apart from these four taxa, pollen grains of <em>Rubus</em> type, Poaceae (“others”), <em>Calluna</em>, <em>Fagopyrum</em>, <em>Trifolium repens</em> s. l., <em>Phacelia</em>, <em>Aster</em> type, <em>Melampyrum</em>, <em>Quercus</em>, <em>Cornus</em>, and <em>Veronica</em> were recorded in the dominant pollen group. The forest habitat taxa that provided pollen rewards to honeybees in the Bojanów forest complex were the following: <em>Rubus</em>, <em>Calluna</em>, <em>Prunus</em>, <em>Tilia</em>, <em>Frangula alnus</em>, <em>Pinus</em>, <em>Quercus</em>, <em>Cornus</em>, <em>Robinia pseudoacacia</em>, <em>Salix</em>, and <em>Vaccinium</em>. Apart from forest vegetation, the species from meadows and wastelands adjacent to this forest complex, represented by <em>Taraxacum</em>, <em>Rumex</em>, <em>Plantago</em>, Poaceae, <em>Trifolium repens</em>, and <em>Solidago</em>, proved to be an important source of pollen. The study indicates that forest communities are a valuable source of pollen for pollinating insects from early spring through to late fall.</p>

scholarly journals Pollen loads of eucalypt and other pollen types in birds in NW Spain

Data in Brief ◽  
2015 ◽  
Vol 5 ◽  
pp. 348-350
Author(s):  
María Calviño-Cancela ◽  
Max Neumann
Keyword(s):  
Nw Spain ◽  
Pollen Loads ◽  
Pollen Types

Phenological phases of pollination related to climate change

2021 ◽  
Author(s):  
Samuel Monnier ◽  
Michel Thibaudon ◽  
Jean-Pierre Besancenot ◽  
Charlotte Sindt ◽  
Gilles Oliver
Keyword(s):  
Climate Change ◽  
Pollen Season ◽  
Microscopic Analysis ◽  
Allergic Diseases ◽  
Early Spring ◽  
Late Winter ◽  
General Tendency ◽  
New Production ◽  
Start Date ◽  
Generic Term

&lt;p&gt;Knowledge:&lt;/p&gt;&lt;p&gt;Rising CO2 levels and climate change may be resulting in some shift in the geographical range of certain plant species, as well as in increased rate of photosynthesis. Many plants respond accordingly with increased growth and reproduction and possibly greater pollen yields, that could affect allergic diseases among other things.&lt;/p&gt;&lt;p&gt;The aim of this study is the evolution of aerobiological measurements in France for 25-30 years. This allows to follow the main phenological parameters in connection with the pollination and the ensuing allergy risk.&lt;/p&gt;&lt;p&gt;Material and method:&lt;/p&gt;&lt;p&gt;The RNSA (French Aerobiology Network) has pollen background-traps located in more than 60 towns throughout France. These traps are volumetric Hirst models making it possible to obtain impacted strips for microscopic analysis by trained operators. The main taxa studied here are birch, grasses and ragweed for a long period of more than 25 years over some cities of France.&lt;/p&gt;&lt;p&gt;Results:&lt;/p&gt;&lt;p&gt;Concerning birch but also other catkins or buds&amp;#8217; trees pollinating in late winter or spring, it can be seen an overall advance of the pollen season start date until 2004 and then a progressive delay, the current date being nearly the same as it was 20 years ago, and an increasing trend in the quantities of pollen emitted.&lt;/p&gt;&lt;p&gt;For grasses and ragweed, we only found a few minor changes in the start date but a longer duration of the pollen season.&lt;/p&gt;&lt;p&gt;Discussion:&lt;/p&gt;&lt;p&gt;As regards the trees, the start date of the new production of catkins or buds is never the 1&lt;sup&gt;st&lt;/sup&gt; of January but depends on the species. For example, it is early July for birch. For breaking dormancy, flowering, and pollinating, the trees and other perennial species need a period of accumulation of cold degrees (Chilling) and later an accumulation of warm degrees (Forcing). With climate change these periods may be shorter or longer depending of the autumn and winter temperature. Therefore, a change in the annual temperature may have a direct effect on the vegetal physiology and hence on pollen release. It may also explain why the quantities of pollen produced are increasing.&lt;/p&gt;&lt;p&gt;The Poaceae reserve, from one place to another and without any spatial structuring, very contrasted patterns which make it impossible to identify a general tendency. This is probably due to the great diversity of taxa grouped under the generic term Poaceae, which are clearly not equally sensitive to climate change.&lt;/p&gt;&lt;p&gt;Conclusion:&lt;/p&gt;&lt;p&gt;Trees with allergenic pollen blowing late winter or early spring pollinate since 2004 later and produce amounts of pollen constantly increasing. Grasses and ragweed have longer periods of pollination with either slightly higher or most often lower pollen production.&lt;/p&gt;

scholarly journals Biogenic amines in protocerebral A2 neurosecretory neurons of Lymantria dispar L. (Lepidoptera:Lymantriidae): Response to trophic stress

2011 ◽  
Vol 63 (3) ◽  
pp. 571-577 ◽  
Author(s):  
Vesna Peric-Mataruga ◽  
Marija Mrdakovic ◽  
Milena Vlahovic ◽  
Larisa Ilijin ◽  
Jankovic Tomanic ◽  
...  
Keyword(s):  
Host Plant ◽  
Biogenic Amines ◽  
Lymantria Dispar ◽  
Quercus Rubra ◽  
Robinia Pseudoacacia ◽  
Morphometric Parameters ◽  
Tree Leaves ◽  
Neurosecretory Neurons ◽  
Population Origin ◽  
Two Populations

The number, morphometric parameters and amount of aminergic neurosecretory product of protocerebral A2 neurosecretory neurons were investigated in the fifth instar of Lymantria dispar caterpillars, following a suitable or unsuitable trophic regime. Caterpillars originated from two populations (Quercus rubra or Robinia pseudoacacia forest) and were differently adapted to trophic stress, i.e. feeding on locust tree leaves - unsuitable host plant. The number of neurosecretory neurons was higher in the caterpillars originated from Robinia population than in Quercus population, regardless of feeding. A2 neurosecretory neurons, nuclei and their nucleoli were larger in caterpillars fed with unsuitable leaves in both populations. There was more aminergic product in the A2 neurosecretory neurons of the caterpillars fed with unsuitable leaves independently of population origin.

scholarly journals Floral Resources and Nesting Requirements of the Ground-Nesting Social Bee,Lasioglossum malachurum(Hymenoptera: Halictidae), in a Mediterranean Semiagricultural Landscape

2010 ◽  
Vol 2010 ◽  
pp. 1-11 ◽  
Author(s):  
Carlo Polidori ◽  
Alice Rubichi ◽  
Valeria Barbieri ◽  
Luca Trombino ◽  
Marta Donegana
Keyword(s):  
Floral Resources ◽  
Resource Utilisation ◽  
Bee Pollination ◽  
Load Variations ◽  
Mediterranean Landscape ◽  
Pollen Loads ◽  
Soil Hardness ◽  
Lasioglossum Malachurum ◽  
Pollen Types ◽  
Social Bee

In order to adopt correct conservation strike plans to maintain bee pollination activity it is necessary to know the species' resource utilisation and requirements. We investigated the floral resources and the nesting requirements of the eusocial beeLasioglossum malachurumKirby at various sites in a Mediterranean landscape. Analysis of bees' pollen loads showed that Compositae was the more exploited family, although interpopulations differences appeared in the pollen types used. From 5 to 7 pollen types were used by bees, but only as few as 1–1.9 per load. Variations of the pollen spectrum through the annual nesting cycle were conspicuous. At all sites, bees nested in horizontal ground areas with high soil hardness, low acidity, and rare superficial stones. On the other side, the exploited soil was variable in soil granulometry (although always high in % of silt or sand) and it was moderately variable in content of organic matter and highly variable in vegetation cover. Creation of ground patches with these characteristics in proximity of both cultivated and natural flowering fields may successfully promote colonization of new areas by this bee.

scholarly journals Synaptic vesicles have two distinct recycling pathways.

1996 ◽  
Vol 135 (3) ◽  
pp. 797-808 ◽  
Author(s):  
J H Koenig ◽  
K Ikeda
Keyword(s):  
Active Zone ◽  
Time Course ◽  
Microscopic Analysis ◽  
Temperature Sensitive ◽  
Fast Time ◽  
Permissive Temperature ◽  
Electron Microscopic ◽  
Experimental Conditions ◽  
Vesicle Recycling ◽  
Two Populations

In this paper, evidence is presented that two distinct synaptic vesicle recycling pathways exist within a single terminal. One pathway emanates from the active zone, has a fast time course, involves no intermediate structures, and is blocked by exposure to high Mg2+/low Ca2+ saline, while the second pathway emanates at sites away from the active zone, has a slower time course, involves an endosomal intermediate, and is not sensitive to high Mg2+/low Ca2+. To visualize these two recycling pathways, the temperature-sensitive Drosophila mutant, shibire, in which vesicle recycling is normal at 19 degrees C but is blocked at 29 degrees C, was used. With exposure to 29 degrees C, complete vesicle depletion occurs as exocytosis proceeds while endocytosis is blocked. When the temperature is lowered to 26 degrees C, vesicle recycling membrane begins to accumulate as invaginations of the plasmalemma, but pinch-off is blocked. Under these experimental conditions, it was possible to distinguish the two separate pathways by electron microscopic analysis. These two pathways were further characterized by observing the normal recycling process at the permissive temperature, 19 degrees C. It is suggested that the function of these two recycling pathways might be to produce two distinct vesicle populations: the active zone and nonactive zone populations. The possibility that these two populations have different release characteristics and functions is discussed.

scholarly journals Botanical profile of bee pollen from the southern coastal region of Bahia, Brazil

2010 ◽  
Vol 24 (3) ◽  
pp. 862-867 ◽  
Author(s):  
Marcos da Costa Dórea ◽  
Jaílson Santos de Novais ◽  
Francisco de Assis Ribeiro dos Santos
Keyword(s):  
Apis Mellifera ◽  
Plant Species ◽  
Coastal Region ◽  
Botanical Origin ◽  
Mimosa Pudica ◽  
Bee Pollen ◽  
Pollen Loads ◽  
Pollen Types ◽  
Pollen Sources ◽  
Forest Biome

This paper aims to identify the botanical origin of pollen loads collected by Apis mellifera L. in Canavieiras municipality, Bahia state. It provides a list of polliniferous plant species from the Atlantic Forest biome that are important for the development of regional apiculture. Using the acetolysis method, 35 bee-pollen samples were analyzed qualitatively and quantitatively. Results showed that pollen types Elaeis (23.99%), Mimosa pudica (22.78%) and Cecropia (13.68%) were the most abundant among the samples. These also showed the highest relative frequencies of the material studied and were important pollen sources for bees in the study area.

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