Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator
Sex differences in diet and foraging behaviour are common in sexually dimorphic species, often driven by differences in the cost of locomotion or ability to exploit different ecological niches. However, sex-specific foraging strategies also occur in monomorphic or slightly dimorphic species where th...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-04-01
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| Series: | Frontiers in Marine Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2021.636468/full |
| _version_ | 1818456345512247296 |
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| author | Joan Giménez Joan Giménez Gavin E. Arneill Gavin E. Arneill Ashley Bennison Ashley Bennison Enrico Pirotta Enrico Pirotta Hans D. Gerritsen Thomas W. Bodey Thomas W. Bodey Stuart Bearhop Keith C. Hamer Stephen Votier Mark Jessopp Mark Jessopp |
| author_facet | Joan Giménez Joan Giménez Gavin E. Arneill Gavin E. Arneill Ashley Bennison Ashley Bennison Enrico Pirotta Enrico Pirotta Hans D. Gerritsen Thomas W. Bodey Thomas W. Bodey Stuart Bearhop Keith C. Hamer Stephen Votier Mark Jessopp Mark Jessopp |
| author_sort | Joan Giménez |
| collection | DOAJ |
| description | Sex differences in diet and foraging behaviour are common in sexually dimorphic species, often driven by differences in the cost of locomotion or ability to exploit different ecological niches. However, sex-specific foraging strategies also occur in monomorphic or slightly dimorphic species where the drivers are poorly understood. Here, we study sex differences in foraging of northern gannets (Morus bassanus), where females are only slightly heavier than males. Using concurrently tracked gannets (298 full foraging trips from 81 individuals) and fishing vessels across 5 years, we quantify individual-based vessel-associated putative foraging, and relate this to discard consumption. We found a significant positive relationship between time spent in vessel-associated foraging and discard consumption for both sexes. However, while females showed greater proportions of vessel-associated foraging than males, discarded fish contributed less to the diet of females in all years. These results contrast with previous suggestions that female gannets interact with vessels less often than males, and are consistent with competitive exclusion of females from trawler-associated discards. Our findings give insight into sexual differences in foraging behaviour in the absence of dimorphism that are necessary to predict their response to environmental and anthropogenic changes. |
| first_indexed | 2024-12-14T22:25:12Z |
| format | Article |
| id | doaj.art-821f88ce8c6b413585c585b8751cc6e9 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-14T22:25:12Z |
| publishDate | 2021-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-821f88ce8c6b413585c585b8751cc6e92022-12-21T22:45:23ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452021-04-01810.3389/fmars.2021.636468636468Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top PredatorJoan Giménez0Joan Giménez1Gavin E. Arneill2Gavin E. Arneill3Ashley Bennison4Ashley Bennison5Enrico Pirotta6Enrico Pirotta7Hans D. Gerritsen8Thomas W. Bodey9Thomas W. Bodey10Stuart Bearhop11Keith C. Hamer12Stephen Votier13Mark Jessopp14Mark Jessopp15MaREI Centre, Environmental Research Institute, University College Cork, Cork, IrelandSchool of Biological, Earth, and Environmental Sciences, University College Cork, Cork, IrelandMaREI Centre, Environmental Research Institute, University College Cork, Cork, IrelandSchool of Biological, Earth, and Environmental Sciences, University College Cork, Cork, IrelandMaREI Centre, Environmental Research Institute, University College Cork, Cork, IrelandSchool of Biological, Earth, and Environmental Sciences, University College Cork, Cork, IrelandSchool of Biological, Earth, and Environmental Sciences, University College Cork, Cork, IrelandDepartment of Mathematics and Statistics, Washington State University, Vancouver, WA, United StatesMarine Institute, Foras na Mara, Oranmore, IrelandCentre for Ecology and Conservation, University of Exeter, Penryn, United KingdomSchool of Biological Sciences, University of Aberdeen, King’s College, Aberdeen, United KingdomCentre for Ecology and Conservation, University of Exeter, Penryn, United KingdomSchool of Biology, University of Leeds, Leeds, United KingdomLyell Centre, Heriot-Watt University, Edinburgh, United KingdomMaREI Centre, Environmental Research Institute, University College Cork, Cork, IrelandSchool of Biological, Earth, and Environmental Sciences, University College Cork, Cork, IrelandSex differences in diet and foraging behaviour are common in sexually dimorphic species, often driven by differences in the cost of locomotion or ability to exploit different ecological niches. However, sex-specific foraging strategies also occur in monomorphic or slightly dimorphic species where the drivers are poorly understood. Here, we study sex differences in foraging of northern gannets (Morus bassanus), where females are only slightly heavier than males. Using concurrently tracked gannets (298 full foraging trips from 81 individuals) and fishing vessels across 5 years, we quantify individual-based vessel-associated putative foraging, and relate this to discard consumption. We found a significant positive relationship between time spent in vessel-associated foraging and discard consumption for both sexes. However, while females showed greater proportions of vessel-associated foraging than males, discarded fish contributed less to the diet of females in all years. These results contrast with previous suggestions that female gannets interact with vessels less often than males, and are consistent with competitive exclusion of females from trawler-associated discards. Our findings give insight into sexual differences in foraging behaviour in the absence of dimorphism that are necessary to predict their response to environmental and anthropogenic changes.https://www.frontiersin.org/articles/10.3389/fmars.2021.636468/fulldietfisheriesnorthern gannetsstable isotopestracking data |
| spellingShingle | Joan Giménez Joan Giménez Gavin E. Arneill Gavin E. Arneill Ashley Bennison Ashley Bennison Enrico Pirotta Enrico Pirotta Hans D. Gerritsen Thomas W. Bodey Thomas W. Bodey Stuart Bearhop Keith C. Hamer Stephen Votier Mark Jessopp Mark Jessopp Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator Frontiers in Marine Science diet fisheries northern gannets stable isotopes tracking data |
| title | Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator |
| title_full | Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator |
| title_fullStr | Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator |
| title_full_unstemmed | Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator |
| title_short | Sexual Mismatch Between Vessel-Associated Foraging and Discard Consumption in a Marine Top Predator |
| title_sort | sexual mismatch between vessel associated foraging and discard consumption in a marine top predator |
| topic | diet fisheries northern gannets stable isotopes tracking data |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2021.636468/full |
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