Assessing hybrid vigor using the thermal sensitivity of physiological trade-offs in tiger salamanders
Hybridization between species affects biodiversity and population sustainability in numerous ways, many of which depend on the fitness of the hybrid relative to the parental species. Hybrids can exhibit fitter phenotypes compared to the parental lineages, and this ‘hybrid vigor’ can then lead to the...
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| creator | Burger, Isabella Carter, Evin Magner, Lexie Munoz, Martha Sears, Michael Fitzpatrick, Ben Riddell, Eric |
| description | Hybridization between species affects biodiversity and population
sustainability in numerous ways, many of which depend on the fitness of
the hybrid relative to the parental species. Hybrids can exhibit fitter
phenotypes compared to the parental lineages, and this ‘hybrid vigor’ can
then lead to the extinction of one or both parental lines. In this study,
we analyzed the relationship between water loss and gas exchange to
compare physiological performance among three tiger salamander genotypes –
the native California tiger salamander (CTS), the invasive barred tiger
salamanders (BTS), and CTS x BTS hybrids across multiple temperatures
(13.5°C, 20.5°C, and 23.5°C). We developed a new index of performance, the
water-gas exchange ratio (WGER), which we define as the ratio of gas
exchange to evaporative water loss (µL VO2/µL H2O). The ratio describes
the ability of an organism to support energetically costly activities with
high levels of gas exchange while simultaneously limiting water loss to
lower desiccation risk. We used flow-through respirometry to measure the
thermal sensitivity of metabolic rate and resistance to water loss of each
salamander genotype to compare indices of physiological performance. We
found that temperature had a significant effect on metabolic rate and
resistance to water loss, with both traits increasing as temperatures
warmed. Across genotypes, we found that hybrids have a higher WGER than
the native CTS, owing to a higher metabolic rate despite having a lower
resistance to water loss. These results provide greater insight into the
physiological mechanisms driving hybrid vigor and offer a potential
explanation for the rapid spread of salamander hybrids. More broadly, our
introduction of the WGER may allow for species- or lineage-wide
comparisons of physiological performance across changing environmental
conditions, highlighting the insight that can be gleaned from multi-trait
analysis of organism performance. |
| doi_str_mv | 10.5061/dryad.7h44j1019 |
| format | Dataset |
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sustainability in numerous ways, many of which depend on the fitness of
the hybrid relative to the parental species. Hybrids can exhibit fitter
phenotypes compared to the parental lineages, and this ‘hybrid vigor’ can
then lead to the extinction of one or both parental lines. In this study,
we analyzed the relationship between water loss and gas exchange to
compare physiological performance among three tiger salamander genotypes –
the native California tiger salamander (CTS), the invasive barred tiger
salamanders (BTS), and CTS x BTS hybrids across multiple temperatures
(13.5°C, 20.5°C, and 23.5°C). We developed a new index of performance, the
water-gas exchange ratio (WGER), which we define as the ratio of gas
exchange to evaporative water loss (µL VO2/µL H2O). The ratio describes
the ability of an organism to support energetically costly activities with
high levels of gas exchange while simultaneously limiting water loss to
lower desiccation risk. We used flow-through respirometry to measure the
thermal sensitivity of metabolic rate and resistance to water loss of each
salamander genotype to compare indices of physiological performance. We
found that temperature had a significant effect on metabolic rate and
resistance to water loss, with both traits increasing as temperatures
warmed. Across genotypes, we found that hybrids have a higher WGER than
the native CTS, owing to a higher metabolic rate despite having a lower
resistance to water loss. These results provide greater insight into the
physiological mechanisms driving hybrid vigor and offer a potential
explanation for the rapid spread of salamander hybrids. More broadly, our
introduction of the WGER may allow for species- or lineage-wide
comparisons of physiological performance across changing environmental
conditions, highlighting the insight that can be gleaned from multi-trait
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sustainability in numerous ways, many of which depend on the fitness of
the hybrid relative to the parental species. Hybrids can exhibit fitter
phenotypes compared to the parental lineages, and this ‘hybrid vigor’ can
then lead to the extinction of one or both parental lines. In this study,
we analyzed the relationship between water loss and gas exchange to
compare physiological performance among three tiger salamander genotypes –
the native California tiger salamander (CTS), the invasive barred tiger
salamanders (BTS), and CTS x BTS hybrids across multiple temperatures
(13.5°C, 20.5°C, and 23.5°C). We developed a new index of performance, the
water-gas exchange ratio (WGER), which we define as the ratio of gas
exchange to evaporative water loss (µL VO2/µL H2O). The ratio describes
the ability of an organism to support energetically costly activities with
high levels of gas exchange while simultaneously limiting water loss to
lower desiccation risk. We used flow-through respirometry to measure the
thermal sensitivity of metabolic rate and resistance to water loss of each
salamander genotype to compare indices of physiological performance. We
found that temperature had a significant effect on metabolic rate and
resistance to water loss, with both traits increasing as temperatures
warmed. Across genotypes, we found that hybrids have a higher WGER than
the native CTS, owing to a higher metabolic rate despite having a lower
resistance to water loss. These results provide greater insight into the
physiological mechanisms driving hybrid vigor and offer a potential
explanation for the rapid spread of salamander hybrids. More broadly, our
introduction of the WGER may allow for species- or lineage-wide
comparisons of physiological performance across changing environmental
conditions, highlighting the insight that can be gleaned from multi-trait
analysis of organism performance.</description><subject>FOS: Biological sciences</subject><subject>gas exchange</subject><subject>genotype</subject><subject>Hybridization</subject><subject>Metabolism</subject><subject>respiration efficiency</subject><subject>salamander</subject><subject>trade-offs</subject><subject>water loss</subject><fulltext>true</fulltext><rsrctype>dataset</rsrctype><creationdate>2023</creationdate><recordtype>dataset</recordtype><sourceid>PQ8</sourceid><recordid>eNqVjr0KwkAQhK-xELW23ReI5vAPSxHFB7A_1twmWUlyYfcU7u01IvYWw8B8DHzGzG2-2ORbu_SS0C929Xp9t7ndjw0dVEmVuwrqdBP28OQqCDw-U6xpiLTYgFKnHPnJMUEooa-TcmhCxcUbRkFPWShLBe4gckUCig222HkSnZpRiY3S7NsTszyfrsdL5jFiwZFcL9yiJGdzN4i6j6j7ia7-f7wAF2RQsQ</recordid><startdate>20231018</startdate><enddate>20231018</enddate><creator>Burger, Isabella</creator><creator>Carter, Evin</creator><creator>Magner, Lexie</creator><creator>Munoz, Martha</creator><creator>Sears, Michael</creator><creator>Fitzpatrick, Ben</creator><creator>Riddell, Eric</creator><general>Dryad</general><scope>DYCCY</scope><scope>PQ8</scope><orcidid>https://orcid.org/0000-0002-4143-4791</orcidid></search><sort><creationdate>20231018</creationdate><title>Assessing hybrid vigor using the thermal sensitivity of physiological trade-offs in tiger salamanders</title><author>Burger, Isabella ; Carter, Evin ; Magner, Lexie ; Munoz, Martha ; Sears, Michael ; Fitzpatrick, Ben ; Riddell, Eric</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-datacite_primary_10_5061_dryad_7h44j10193</frbrgroupid><rsrctype>datasets</rsrctype><prefilter>datasets</prefilter><language>eng</language><creationdate>2023</creationdate><topic>FOS: Biological sciences</topic><topic>gas exchange</topic><topic>genotype</topic><topic>Hybridization</topic><topic>Metabolism</topic><topic>respiration efficiency</topic><topic>salamander</topic><topic>trade-offs</topic><topic>water loss</topic><toplevel>online_resources</toplevel><creatorcontrib>Burger, Isabella</creatorcontrib><creatorcontrib>Carter, Evin</creatorcontrib><creatorcontrib>Magner, Lexie</creatorcontrib><creatorcontrib>Munoz, Martha</creatorcontrib><creatorcontrib>Sears, Michael</creatorcontrib><creatorcontrib>Fitzpatrick, Ben</creatorcontrib><creatorcontrib>Riddell, Eric</creatorcontrib><collection>DataCite (Open Access)</collection><collection>DataCite</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Burger, Isabella</au><au>Carter, Evin</au><au>Magner, Lexie</au><au>Munoz, Martha</au><au>Sears, Michael</au><au>Fitzpatrick, Ben</au><au>Riddell, Eric</au><format>book</format><genre>unknown</genre><ristype>DATA</ristype><title>Assessing hybrid vigor using the thermal sensitivity of physiological trade-offs in tiger salamanders</title><date>2023-10-18</date><risdate>2023</risdate><abstract>Hybridization between species affects biodiversity and population
sustainability in numerous ways, many of which depend on the fitness of
the hybrid relative to the parental species. Hybrids can exhibit fitter
phenotypes compared to the parental lineages, and this ‘hybrid vigor’ can
then lead to the extinction of one or both parental lines. In this study,
we analyzed the relationship between water loss and gas exchange to
compare physiological performance among three tiger salamander genotypes –
the native California tiger salamander (CTS), the invasive barred tiger
salamanders (BTS), and CTS x BTS hybrids across multiple temperatures
(13.5°C, 20.5°C, and 23.5°C). We developed a new index of performance, the
water-gas exchange ratio (WGER), which we define as the ratio of gas
exchange to evaporative water loss (µL VO2/µL H2O). The ratio describes
the ability of an organism to support energetically costly activities with
high levels of gas exchange while simultaneously limiting water loss to
lower desiccation risk. We used flow-through respirometry to measure the
thermal sensitivity of metabolic rate and resistance to water loss of each
salamander genotype to compare indices of physiological performance. We
found that temperature had a significant effect on metabolic rate and
resistance to water loss, with both traits increasing as temperatures
warmed. Across genotypes, we found that hybrids have a higher WGER than
the native CTS, owing to a higher metabolic rate despite having a lower
resistance to water loss. These results provide greater insight into the
physiological mechanisms driving hybrid vigor and offer a potential
explanation for the rapid spread of salamander hybrids. More broadly, our
introduction of the WGER may allow for species- or lineage-wide
comparisons of physiological performance across changing environmental
conditions, highlighting the insight that can be gleaned from multi-trait
analysis of organism performance.</abstract><pub>Dryad</pub><doi>10.5061/dryad.7h44j1019</doi><orcidid>https://orcid.org/0000-0002-4143-4791</orcidid><oa>free_for_read</oa></addata></record> |
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| identifier | DOI: 10.5061/dryad.7h44j1019 |
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| language | eng |
| recordid | cdi_datacite_primary_10_5061_dryad_7h44j1019 |
| source | DataCite |
| subjects | FOS: Biological sciences gas exchange genotype Hybridization Metabolism respiration efficiency salamander trade-offs water loss |
| title | Assessing hybrid vigor using the thermal sensitivity of physiological trade-offs in tiger salamanders |
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