Standard metabolic rate variation among New Zealand Orthoptera
Standard metabolic rates (SMR) of ectotherms reflect the energetic cost of self-maintenance and thus provide important information about life-history strategies of organisms. We examined variation in SMR among fifteen species of New Zealand orthopteran. These species represent a heterogeneous group...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-01-01
|
| Series: | Current Research in Insect Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666515824000222 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846127200331366400 |
|---|---|
| author | Mariana Bulgarella John Haywood Eddy J. Dowle Mary Morgan-Richards Steven A. Trewick |
| author_facet | Mariana Bulgarella John Haywood Eddy J. Dowle Mary Morgan-Richards Steven A. Trewick |
| author_sort | Mariana Bulgarella |
| collection | DOAJ |
| description | Standard metabolic rates (SMR) of ectotherms reflect the energetic cost of self-maintenance and thus provide important information about life-history strategies of organisms. We examined variation in SMR among fifteen species of New Zealand orthopteran. These species represent a heterogeneous group with a wide geographic distribution, differing morphologies and life histories. Gathering original data on morphological and physiological traits of individual species is a first step towards understanding existing variability. Individual metabolic rates of ectotherms are one of the first traits to respond to climate change. Baseline SMR datasets are valuable for modeling current species distributions and their responses to a changing climate. At higher latitudes, the average environmental temperature decreases. The pattern that cold-adapted ectotherms display higher SMR at colder temperatures and greater thermal sensitivity to compensate for lower temperatures and the shorter growing and reproductive seasons is predicted from the metabolic cold adaptation (MCA) hypothesis. We predict higher SMR for the orthopteran species found at higher latitudes. We further compared the index of thermal sensitivity Q10 per species. We used closed-system respirometry to measure SMR, at two test temperatures (4 °C and 14 °C), for the fifteen species acclimated to the same conditions. As expected, we found significant differences in SMR among species. The rate of oxygen consumption was positively correlated with body mass. Our findings do not support the MCA hypothesis. In fact, we found evidence of co-gradient variation in SMR, whereby insects from higher elevations and latitudes presented lower SMR. We discuss our findings in relation to life histories and ecology of each species. The novel physiological data presented will aid in understanding potential responses of these unusual species to changing climatic conditions in Aotearoa/New Zealand. |
| format | Article |
| id | doaj-art-ecf76973b438425995e8c9f54da57ba3 |
| institution | Kabale University |
| issn | 2666-5158 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Current Research in Insect Science |
| spelling | doaj-art-ecf76973b438425995e8c9f54da57ba32024-12-12T05:23:19ZengElsevierCurrent Research in Insect Science2666-51582024-01-016100092Standard metabolic rate variation among New Zealand OrthopteraMariana Bulgarella0John Haywood1Eddy J. Dowle2Mary Morgan-Richards3Steven A. Trewick4Ecology, College of Science, Massey University Manawatū, Private Bag 11-222, Palmerston North 4442, New Zealand; School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand; Corresponding author.School of Mathematics and Statistics, Victoria University of Wellington, PO Box 600, Wellington 6140, New ZealandAnatomy Department, Otago University, PO Box 56, Dunedin 9054, New ZealandEcology, College of Science, Massey University Manawatū, Private Bag 11-222, Palmerston North 4442, New ZealandEcology, College of Science, Massey University Manawatū, Private Bag 11-222, Palmerston North 4442, New ZealandStandard metabolic rates (SMR) of ectotherms reflect the energetic cost of self-maintenance and thus provide important information about life-history strategies of organisms. We examined variation in SMR among fifteen species of New Zealand orthopteran. These species represent a heterogeneous group with a wide geographic distribution, differing morphologies and life histories. Gathering original data on morphological and physiological traits of individual species is a first step towards understanding existing variability. Individual metabolic rates of ectotherms are one of the first traits to respond to climate change. Baseline SMR datasets are valuable for modeling current species distributions and their responses to a changing climate. At higher latitudes, the average environmental temperature decreases. The pattern that cold-adapted ectotherms display higher SMR at colder temperatures and greater thermal sensitivity to compensate for lower temperatures and the shorter growing and reproductive seasons is predicted from the metabolic cold adaptation (MCA) hypothesis. We predict higher SMR for the orthopteran species found at higher latitudes. We further compared the index of thermal sensitivity Q10 per species. We used closed-system respirometry to measure SMR, at two test temperatures (4 °C and 14 °C), for the fifteen species acclimated to the same conditions. As expected, we found significant differences in SMR among species. The rate of oxygen consumption was positively correlated with body mass. Our findings do not support the MCA hypothesis. In fact, we found evidence of co-gradient variation in SMR, whereby insects from higher elevations and latitudes presented lower SMR. We discuss our findings in relation to life histories and ecology of each species. The novel physiological data presented will aid in understanding potential responses of these unusual species to changing climatic conditions in Aotearoa/New Zealand.http://www.sciencedirect.com/science/article/pii/S2666515824000222Body massCricketGrasshopperKatydidRate of oxygen consumptionTemperature |
| spellingShingle | Mariana Bulgarella John Haywood Eddy J. Dowle Mary Morgan-Richards Steven A. Trewick Standard metabolic rate variation among New Zealand Orthoptera Current Research in Insect Science Body mass Cricket Grasshopper Katydid Rate of oxygen consumption Temperature |
| title | Standard metabolic rate variation among New Zealand Orthoptera |
| title_full | Standard metabolic rate variation among New Zealand Orthoptera |
| title_fullStr | Standard metabolic rate variation among New Zealand Orthoptera |
| title_full_unstemmed | Standard metabolic rate variation among New Zealand Orthoptera |
| title_short | Standard metabolic rate variation among New Zealand Orthoptera |
| title_sort | standard metabolic rate variation among new zealand orthoptera |
| topic | Body mass Cricket Grasshopper Katydid Rate of oxygen consumption Temperature |
| url | http://www.sciencedirect.com/science/article/pii/S2666515824000222 |
| work_keys_str_mv | AT marianabulgarella standardmetabolicratevariationamongnewzealandorthoptera AT johnhaywood standardmetabolicratevariationamongnewzealandorthoptera AT eddyjdowle standardmetabolicratevariationamongnewzealandorthoptera AT marymorganrichards standardmetabolicratevariationamongnewzealandorthoptera AT stevenatrewick standardmetabolicratevariationamongnewzealandorthoptera |