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Male C. pallida are able detect the pheromones which females release and use them to locate female burrows. When a virgin female is about to emerge from her burrow, she releases a scent that wafts up through the soil and is detected by the antenna of the males. This has led to males developing a very acute olfactory sense. Freshly-killed females have been buried to test whether sound also plays a part in male signaling. In these tests, male bees still dug up the dead females, proving that pheromone signaling is the only pathway. Males have also been observed to dig up other males. This shows that males and virgin females give off similar pheromones. Oddly, males also sometimes dig up other digger bee species. It is currently unknown why this occurs.
Larger females are able to better control the size of their offspring. As stated in the Life Cycle section, more bee bread leads to larger offspring. Larger females are able to gather more pollen and nectar in a shorter amount of time when compared to smaller females. This means that during rich conditions, the larger females can have larger offspring with greater fitness, or if conditions are poor, the females can simply choose to have smaller offspring. There is a lower limit to how small offspring can be, and thus, smaller females can’t make this reduction or increase in size in response to the environment. Smaller females are still able to exist since larger females can’t take advantage of having larger offspring when the density of nesting grounds is low. To put it another way, larger male offspring are less effective in low density nesting grounds since they don’t have as many opportunities to use their size to fight off other males; thus, in low density nesting grounds, small and large males have similar fitness which means that the extra bee bread which the larger male received served no purpose. Smaller males actually do better in low density areas because they don’t have to fight with larger males as much, and by extension, expend less energy. This lack of a reason to produce larger offspring reduces the fitness of the larger females since they have to dig larger tunnels to fit in, but still produce the same size offspring as smaller females.
L'ÎLE-DES-SŒURS, QC, Nov. 6, 2018 /CNW Telbec/ - The Greater Montréal Real Estate Board (GMREB) has just released its most recent residential real estate market statistics for the Montréal Census Metropolitan Area (CMA), based on the real estate brokers' Centris provincial database. In total, 3,731 residential sales were concluded in October 2018, an 11 per cent jump compared to the same month last year. This figure also represents a new sales record for a month of October and the 44th consecutive increase in transactions. Click here to watch the October 2018 statistics video.
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The process of integrating the province’s various Centris databases began approximately five years ago and was completed in June 2008. All transactions concluded through a real estate broker who is a member of a real estate board are added to the new provincial database. The Québec Federation of Real Estate Boards (QFREB) uses this database to publish press releases and other publications on market conditions, including the Centris Barometer – Residential Market, which provides an overview of key performance indicators associated with the resale market (i.e., sales, new listings, median prices, number of days on the market, etc.). These indicators are calculated according to consistent, stringent rules so that statistics can be comparable across geographic areas.
The genus Centris contains circa 250 species of large apid bees occurring in the Neotropical and Nearctic regions, from Kansas to Argentina. Most females of these bees possess adaptations for carrying floral oils rather than (or in addition to) pollen or nectar. They visit mainly plants of the family Malpighiaceae to collect oil, but also Plantaginaceae, Calceolariaceae, Krameriaceae and others. Recent studies have shown they are sister to the corbiculate bees, the most well-known and economically important group of bees 
Centris pallida serve numerous roles for the environment. Like most other bees, they are essential for pollination. Specifically, they pollinate cacti, desert willow, and palo verde. The tunneling ability of these bees aerates the soil, and this allows water from rain to reach plant roots quickly. Their nitrogen rich feces fertilizes the soil. Their stings are mild, so they are not dangerous. The only downside with respect to humans is that their burrowing can leave unsightly mounds. If an area has a large density of burrowing females, then these mounds can be quite noticeable and are difficult to get rid of.
Centris pallida was officially discovered and catalogued by William J. Fox in 1899 near Phoenix, Arizona. Fox also discovered Centris cockerelli, Centris errans, and Sphex subhyalinus. This species is closely related to Centris cockerelli in terms of habitat and genus, but is different in terms of mating, color, and subgenus. This bee also belongs to the superfamily Apoidea, and the subfamily Apinae.