Nesting biology and social organisation of the allodapine bee Exoneura angophorae (Hymenoptera: Apidae): montane environmental constraints yield biased sex allocation yet phenology is unhindered
The life cycle, nesting biology, and social organisation of a progressive provisioning allodapine bee, Exoneura angophorae , are detailed for the first time in the Greater Sydney region at the upper extreme of its altitudinal distribution. Nest collections of this montane population were undertaken...
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| Veröffentlicht in: | Insectes sociaux 2021-11, Vol.68 (4), p.337-349 |
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| creator | Bernauer, O. M. Cook, J. M. Tierney, S. M. |
| description | The life cycle, nesting biology, and social organisation of a progressive provisioning allodapine bee,
Exoneura angophorae
, are detailed for the first time in the Greater Sydney region at the upper extreme of its altitudinal distribution. Nest collections of this montane population were undertaken monthly over an annual period to ascertain the life cycle and explore evidence for reproductive division of labour and sex allocation patterns in a lineage of facultatively social stem nesting bees. Most nests (68.8%) contained multiple adult females (
x
¯
= 2.3 ± 0.07 s.e.,
n
= 591; modal colony size = 2; max. colony size = 13), predominantly collected from
Alsophila australis australis
tree-fern fronds. Ovarian enlargement and egg-laying commenced in autumn with respective peaks in winter and spring, the larval brood first appears in mid spring and pupate through summer until mid autumn. In summer, callow adult emergence coincided with feeding-stage brood providing opportunities for alloparental care and generational overlap—consistent with eusocial definitions of social organisation. Spring nests showed evidence of per capita benefits to brood production with multi-female nests containing the maximum numbers of brood (total and feeding-stage) during this time. Multi-female nests consistently contained more brood than single-female nests across multiple sampling periods, reinforcing implied benefits to group nesting. Within multi-female nests, reproductive dominance hierarchies existed in all seasons and were associated with body size in summer colonies—the largest individuals exhibited the greatest ovarian enlargement (accounting for allometric scaling). Sex allocation was extremely female-biased, based on pupal resource investment and numerical ratios (population-level SR
i
= 0.21; colony-level SR
n
= 0.18), with no evidence for split sex ratios over time or colony size. This montane population of
E. angophorae
experiences the coldest and longest winters of any exoneurine population studied to date. These environmental constraints lead to unhindered phenological patterns but may select for female-biased sex allocation that would promote the evolution of eusocial organisation. |
| doi_str_mv | 10.1007/s00040-021-00832-6 |
| format | Article |
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Exoneura angophorae
, are detailed for the first time in the Greater Sydney region at the upper extreme of its altitudinal distribution. Nest collections of this montane population were undertaken monthly over an annual period to ascertain the life cycle and explore evidence for reproductive division of labour and sex allocation patterns in a lineage of facultatively social stem nesting bees. Most nests (68.8%) contained multiple adult females (
x
¯
= 2.3 ± 0.07 s.e.,
n
= 591; modal colony size = 2; max. colony size = 13), predominantly collected from
Alsophila australis australis
tree-fern fronds. Ovarian enlargement and egg-laying commenced in autumn with respective peaks in winter and spring, the larval brood first appears in mid spring and pupate through summer until mid autumn. In summer, callow adult emergence coincided with feeding-stage brood providing opportunities for alloparental care and generational overlap—consistent with eusocial definitions of social organisation. Spring nests showed evidence of per capita benefits to brood production with multi-female nests containing the maximum numbers of brood (total and feeding-stage) during this time. Multi-female nests consistently contained more brood than single-female nests across multiple sampling periods, reinforcing implied benefits to group nesting. Within multi-female nests, reproductive dominance hierarchies existed in all seasons and were associated with body size in summer colonies—the largest individuals exhibited the greatest ovarian enlargement (accounting for allometric scaling). Sex allocation was extremely female-biased, based on pupal resource investment and numerical ratios (population-level SR
i
= 0.21; colony-level SR
n
= 0.18), with no evidence for split sex ratios over time or colony size. This montane population of
E. angophorae
experiences the coldest and longest winters of any exoneurine population studied to date. These environmental constraints lead to unhindered phenological patterns but may select for female-biased sex allocation that would promote the evolution of eusocial organisation.</description><identifier>ISSN: 0020-1812</identifier><identifier>EISSN: 1420-9098</identifier><identifier>DOI: 10.1007/s00040-021-00832-6</identifier><language>eng</language><publisher>Cham: Springer International Publishing</publisher><subject>Autumn ; Bees ; Biology ; Biomedical and Life Sciences ; Body size ; Colonies ; Division of labor ; Egg laying ; Enlargement ; Entomology ; Exoneura angophorae ; Females ; Ferns ; Fronds ; Hierarchies ; Life cycles ; Life Sciences ; Life Sciences & Biomedicine ; Nesting ; Nests ; Ovaries ; Population ; Population studies ; Provisioning ; Research Article ; Science & Technology ; Sex ; Sex ratio ; Spring ; Spring (season) ; Summer</subject><ispartof>Insectes sociaux, 2021-11, Vol.68 (4), p.337-349</ispartof><rights>International Union for the Study of Social Insects (IUSSI) 2021</rights><rights>International Union for the Study of Social Insects (IUSSI) 2021.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>7</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000690371600001</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-c319t-6a1f14c464bcc76abf281377314e135e53b564db5a3115c773a95aeac86d152d3</citedby><cites>FETCH-LOGICAL-c319t-6a1f14c464bcc76abf281377314e135e53b564db5a3115c773a95aeac86d152d3</cites><orcidid>0000-0002-4814-3188 ; 0000-0001-8447-6126 ; 0000-0002-8812-6753</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00040-021-00832-6$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00040-021-00832-6$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>315,782,786,27931,27932,39265,41495,42564,51326</link.rule.ids></links><search><creatorcontrib>Bernauer, O. M.</creatorcontrib><creatorcontrib>Cook, J. M.</creatorcontrib><creatorcontrib>Tierney, S. M.</creatorcontrib><title>Nesting biology and social organisation of the allodapine bee Exoneura angophorae (Hymenoptera: Apidae): montane environmental constraints yield biased sex allocation yet phenology is unhindered</title><title>Insectes sociaux</title><addtitle>Insect. Soc</addtitle><addtitle>INSECT SOC</addtitle><description>The life cycle, nesting biology, and social organisation of a progressive provisioning allodapine bee,
Exoneura angophorae
, are detailed for the first time in the Greater Sydney region at the upper extreme of its altitudinal distribution. Nest collections of this montane population were undertaken monthly over an annual period to ascertain the life cycle and explore evidence for reproductive division of labour and sex allocation patterns in a lineage of facultatively social stem nesting bees. Most nests (68.8%) contained multiple adult females (
x
¯
= 2.3 ± 0.07 s.e.,
n
= 591; modal colony size = 2; max. colony size = 13), predominantly collected from
Alsophila australis australis
tree-fern fronds. Ovarian enlargement and egg-laying commenced in autumn with respective peaks in winter and spring, the larval brood first appears in mid spring and pupate through summer until mid autumn. In summer, callow adult emergence coincided with feeding-stage brood providing opportunities for alloparental care and generational overlap—consistent with eusocial definitions of social organisation. Spring nests showed evidence of per capita benefits to brood production with multi-female nests containing the maximum numbers of brood (total and feeding-stage) during this time. Multi-female nests consistently contained more brood than single-female nests across multiple sampling periods, reinforcing implied benefits to group nesting. Within multi-female nests, reproductive dominance hierarchies existed in all seasons and were associated with body size in summer colonies—the largest individuals exhibited the greatest ovarian enlargement (accounting for allometric scaling). Sex allocation was extremely female-biased, based on pupal resource investment and numerical ratios (population-level SR
i
= 0.21; colony-level SR
n
= 0.18), with no evidence for split sex ratios over time or colony size. This montane population of
E. angophorae
experiences the coldest and longest winters of any exoneurine population studied to date. These environmental constraints lead to unhindered phenological patterns but may select for female-biased sex allocation that would promote the evolution of eusocial organisation.</description><subject>Autumn</subject><subject>Bees</subject><subject>Biology</subject><subject>Biomedical and Life Sciences</subject><subject>Body size</subject><subject>Colonies</subject><subject>Division of labor</subject><subject>Egg laying</subject><subject>Enlargement</subject><subject>Entomology</subject><subject>Exoneura angophorae</subject><subject>Females</subject><subject>Ferns</subject><subject>Fronds</subject><subject>Hierarchies</subject><subject>Life cycles</subject><subject>Life Sciences</subject><subject>Life Sciences & Biomedicine</subject><subject>Nesting</subject><subject>Nests</subject><subject>Ovaries</subject><subject>Population</subject><subject>Population studies</subject><subject>Provisioning</subject><subject>Research Article</subject><subject>Science & Technology</subject><subject>Sex</subject><subject>Sex ratio</subject><subject>Spring</subject><subject>Spring (season)</subject><subject>Summer</subject><issn>0020-1812</issn><issn>1420-9098</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>HGBXW</sourceid><recordid>eNqNkc1u1TAQhSMEEpfCC7CyxAaEUjx2frurrgpFqmADa2viTHJd5drBdkrzejwZ7g2CXcXKI_k7Psdzsuw18HPgvP4QOOcFz7mAnPNGirx6ku2gEDxveds8zXacpxkaEM-zFyHcJrwRNeyyX18oRGNH1hk3uXFlaHsWnDY4MedHtCZgNM4yN7B4IIbT5HqcjSXWEbGre2dp8Zhko5sPziOxt9frkaybI3m8YJez6ZHeXbCjsxGTjOyd8c4mJCYP7WyIHo2Nga2Gpj4FwUApA92fzPRmv1Jk8yE9ewppAlvswdiePPUvs2cDToFe_TnPsu8fr77tr_Obr58-7y9vci2hjXmFMEChi6rotK4r7AbRgKxrCQWBLKmUXVkVfVeiBCh1usC2RELdVD2Uopdn2Zvt3dm7H0tam7p1i7fJUomyFVI2hYREiY3S3oXgaVCzN0f0qwKuHrpSW1cqdaVOXakqid5vop_UuSFoQ1bTX2Hiq5bLGqo08QeL5v_pvYmnDe7dYmOSyk0aEm5H8v_-8Ei835DYvHI</recordid><startdate>20211101</startdate><enddate>20211101</enddate><creator>Bernauer, O. 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M.</creatorcontrib><creatorcontrib>Cook, J. M.</creatorcontrib><creatorcontrib>Tierney, S. M.</creatorcontrib><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>Web of Science - Science Citation Index Expanded - 2021</collection><collection>CrossRef</collection><collection>Entomology Abstracts (Full archive)</collection><jtitle>Insectes sociaux</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bernauer, O. M.</au><au>Cook, J. M.</au><au>Tierney, S. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Nesting biology and social organisation of the allodapine bee Exoneura angophorae (Hymenoptera: Apidae): montane environmental constraints yield biased sex allocation yet phenology is unhindered</atitle><jtitle>Insectes sociaux</jtitle><stitle>Insect. Soc</stitle><stitle>INSECT SOC</stitle><date>2021-11-01</date><risdate>2021</risdate><volume>68</volume><issue>4</issue><spage>337</spage><epage>349</epage><pages>337-349</pages><issn>0020-1812</issn><eissn>1420-9098</eissn><abstract>The life cycle, nesting biology, and social organisation of a progressive provisioning allodapine bee,
Exoneura angophorae
, are detailed for the first time in the Greater Sydney region at the upper extreme of its altitudinal distribution. Nest collections of this montane population were undertaken monthly over an annual period to ascertain the life cycle and explore evidence for reproductive division of labour and sex allocation patterns in a lineage of facultatively social stem nesting bees. Most nests (68.8%) contained multiple adult females (
x
¯
= 2.3 ± 0.07 s.e.,
n
= 591; modal colony size = 2; max. colony size = 13), predominantly collected from
Alsophila australis australis
tree-fern fronds. Ovarian enlargement and egg-laying commenced in autumn with respective peaks in winter and spring, the larval brood first appears in mid spring and pupate through summer until mid autumn. In summer, callow adult emergence coincided with feeding-stage brood providing opportunities for alloparental care and generational overlap—consistent with eusocial definitions of social organisation. Spring nests showed evidence of per capita benefits to brood production with multi-female nests containing the maximum numbers of brood (total and feeding-stage) during this time. Multi-female nests consistently contained more brood than single-female nests across multiple sampling periods, reinforcing implied benefits to group nesting. Within multi-female nests, reproductive dominance hierarchies existed in all seasons and were associated with body size in summer colonies—the largest individuals exhibited the greatest ovarian enlargement (accounting for allometric scaling). Sex allocation was extremely female-biased, based on pupal resource investment and numerical ratios (population-level SR
i
= 0.21; colony-level SR
n
= 0.18), with no evidence for split sex ratios over time or colony size. This montane population of
E. angophorae
experiences the coldest and longest winters of any exoneurine population studied to date. These environmental constraints lead to unhindered phenological patterns but may select for female-biased sex allocation that would promote the evolution of eusocial organisation.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s00040-021-00832-6</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-4814-3188</orcidid><orcidid>https://orcid.org/0000-0001-8447-6126</orcidid><orcidid>https://orcid.org/0000-0002-8812-6753</orcidid></addata></record> |
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| source | SpringerNature Journals; Web of Science - Science Citation Index Expanded - 2021<img src="https://exlibris-pub.s3.amazonaws.com/fromwos-v2.jpg" /> |
| subjects | Autumn Bees Biology Biomedical and Life Sciences Body size Colonies Division of labor Egg laying Enlargement Entomology Exoneura angophorae Females Ferns Fronds Hierarchies Life cycles Life Sciences Life Sciences & Biomedicine Nesting Nests Ovaries Population Population studies Provisioning Research Article Science & Technology Sex Sex ratio Spring Spring (season) Summer |
| title | Nesting biology and social organisation of the allodapine bee Exoneura angophorae (Hymenoptera: Apidae): montane environmental constraints yield biased sex allocation yet phenology is unhindered |
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