Native bees on crops in eastern Victoria · Reed bees usually nest in tree ferns in forests, but...
Transcript of Native bees on crops in eastern Victoria · Reed bees usually nest in tree ferns in forests, but...
Native bees on crops in eastern Victoria
Julian Brown
Australian National University
Outline
• Native Victoria bees visiting crops.
• Native vegetation and Victorian bees.
• Making nests for Victorian bees.
Study area
• 6 x orchards (mostly apple, some cherry)
• 7 x berry farms (blueberry, raspberry, blackberry)
• 7 x forest sites
Exoneura on Rubus. Photo credit: Alison Hoelzer
Victorian bees visiting crops
Crop visitation
Homalictus sp.
Lasioglossumparasphecodes sp.
White-banded bee(Lasioglossum sp.)
Red reed bee(Exoneura sp.)
Blueberry
Apple
Raspberry andblackberry
Lipotriches sp.
Cherry
Black reed bee(Exoneura sp.)
This figure shows the Victorian bees, on the left, that I found visiting these crops on the right. A line connecting a bee to a crop indicates that I’ve seen that bee visiting that crop. The thickness of these lines is roughly proportional to the frequency of visitation, with thicker lines indicating more frequent visitation of that crop by that bee.
Native vegetation and Victorian bees
Nesting substrate
Homalictus sp.
Lasioglossumparasphecodes sp.
White-banded bee(Lasioglossum sp.)
Red reed bee(Exoneura sp.)
Lipotriches sp.
Black reed bee(Exoneura sp.)
Reed bees nest in pithy stems of things like tree ferns and bramble. All the other bees found visiting fruit crops nest in the soil.
Floral resources
Homalictus sp.
Lasioglossumparasphecodes sp.
White-banded bee(Lasioglossum sp.)
Red reed bee(Exoneura sp.)
Lipotriches sp.
Black reed bee(Exoneura sp.)
Natives
Crops
Weeds
A thicker line connecting a bee to a group of flowers indicates that bee visited that group of flowers more frequently.
Flowering time
Red reed bee(Exoneura sp.)
Natives
Crops
August
September
October
November
December
January
February
March
Natives
Reed bees are actively foraging from the end of winter into autumn. Reed bees visit native plants like Acacias and Hakeas before crops start flowering, and visit native plants like Kunzea, Leptospermum, and Pultenaea after crops finish flowering in summer and autumn.
Flowering time
Natives
Crops
August
September
October
November
December
January
February
March
Natives
Lipotriches sp.
Lasioglossumparasphecodes sp.
Parasphecodes mostly visits Acacia in late winter-early spring.Lipotriches mostly visit Kunzea and Leptospermum in late spring-early summer.
Crops
Flowering time August
September
October
November
December
January
February
March
White-banded bees and Homalictusmostly visited weeds like cape weed and wild Brassica that are found in orchards, berry farms, and pastures.
Homalictus sp.
White-banded bee(Lasioglossum sp.)
Crops
Weeds
Crops
?
Homalictus sp.
Lasioglossumparasphecodes sp.
White-banded bee(Lasioglossum sp.)
Red reed bee(Exoneura sp.)
Lipotriches sp.
Black reed bee(Exoneura sp.)
Landscape associations
Heavily forested
Mixed forest-agriculture
Landscape types
Predominantly agriculture
This figure shows the associations of our crop-visiting bees with different kinds of landscapes on the right. In this figure, a thicker line connecting a bee to a landscape type indicates that we found higher numbers of this kind of bee (in our traps and visiting flowers) in that kind of landscape.
Making nests for reed bees
Why reed bees?
• Visit all surveyed crops in relatively high numbers.
• Carry large amounts of crop pollen (so are probablygood crop pollinators… but not yet sure).
• Pollinate rarer native plants, including some sun orchids (Thelymitra) and donkey orchids (Diuris).
• Artificial nests are easy to make.
Reed bee nests
Reed bees usually nest in tree ferns in forests, but sometimes nest in cultivated and wild bramble in landscapes without much forest.
Reed bee nests
Reed bees nest in the stumps of old canes cut in previous years (as shown by red arrow in middle picture).They also nest in canes bundled together and housed in PVC pipe (bottom picture).
Thank you
Contact me for further information: [email protected]
This project is supported by AgriFutures Australia, through funding from the Australian Government Department of Agriculture as part of its Rural R&D for Profit program.