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Responses of sympatric shearwaters to supplemental food under varying natural prey availability on the wintering grounds of coastal Newfoundland, Canada
Citation
CARVALHO, P.C., MAYNARD, L.D. & DAVOREN, G.K. 2020. Responses of sympatric shearwaters to supplemental food under varying natural prey availability on the wintering grounds of coastal Newfoundland, Canada. Marine Ornithology 48: 255 - 262
Received 13 March 2020, accepted 21 July 2020
Date Published: 2020/10/15
Date Online: 2020/07/26
Key words: species interactions, interspecific competition, fisheries discards, prey availability, shearwater, Ardea
Abstract
Species tend to concentrate in areas with high prey availability, which could lead to competitive interactions within a feeding assemblage as resources become depleted. In coastal Newfoundland, Canada, capelin Mallotus villosus is the focal forage fish species that many top predators feed on during the summer; however, inshore availability varies throughout the boreal summer when abundant aggregations migrate inshore to spawn. We investigated the interactions and responses of Great Shearwaters Ardenna gravis and Sooty Shearwaters A. grisea during their non-breeding season to supplemental food supply under changing natural prey availability (higher and lower capelin availability) by conducting an at-sea experiment during July-August (2015/2016) in coastal Newfoundland. Supplemental food was offered every 30 s over 10 min (‘experimental period'), which was preceded and followed by 10-min control periods (i.e., no food provided). The number of both species increased during the experimental periods, indicating that both species were attracted to the food supplementation experiment. Great Shearwaters were 7.6-13.8 times more likely than Sooty Shearwaters to land near the experimental platform and 95.2 times more likely than Sooty Shearwaters to fight over supplemental food items with individuals of the same or different species. These species-specific tendencies remained consistent as prey availability varied within years, but both species increased in their abundance and interactions with other species (including Herring Gulls Larus argentatus and Northern Fulmars Fulmarus glacialis) during prey capture at lower relative to higher prey availability, as evidenced by lower proportions of flying birds and a greater likelihood of landing on the water. Overall, we suggest that when Great and Sooty shearwaters feed in close association, Great Shearwaters are the more competitively dominant species, which may lead to higher risks of by-catch mortality, especially when the availability of natural prey decreases.
References
ARCOS, J.M. & ORO, D. 2002. Significance of fisheries discards for a threatened Mediterranean seabird, the Balearic shearwater Puffinus mauretanicus. Marine Ecology Progress Series 239: 209-220. doi:10.3354/meps239209
ASHMOLE, N.P. 1971. Seabird ecology and the marine environment. Avian Biology 1: 223-286.
BAIROS-NOVAK, K.R., CROOK, K.A. & DAVOREN, G.K. 2015. Relative importance of local enhancement as a search strategy for breeding seabirds: an experimental approach. Animal Behaviour 106: 71-78. doi:10.1016/j.anbehav.2015.05.002
BICKNELL, A.W.J., ORO, D., CAMPHUYSEN, K.C.J. & VOTIER, S.C. 2013. Potential consequences of discard reform for seabird communities. Journal of Applied Ecology 50: 649-658. doi:10.1111/1365-2664.12072
BROWN, R.G.B., BOURNE, W.R.P. & WAHL, T.R. 1978. Diving by shearwaters. The Condor 80: 123-125.
BUGONI, L., MCGILL, R.A.R. & FURNESS, R.W. 2010. The importance of pelagic longline fishery discards for a seabird community determined through stable isotope analysis. Journal of Experimental Marine Biology and Ecology 391: 190-200.
BUGONI, L., NEVES, T.S., PEPPES, F. V. & FURNESS, R.W. 2008. An effective method for trapping scavenging seabirds at sea. Journal of Field Ornithology 79: 308-313. doi:10.1111/j.1557-9263.2008.00178.x
CAMPHUYSEN, K.C.J. & GARTHE, S. 1997. An evaluation of the distribution and scavenging habits of northern fulmars (Fulmarus glacialis) in the North Sea. ICES Journal of Marine Science 54: 654-683. doi:10.1006/jmsc.1997.0247
CAMPHUYSEN, K.C.J. & WEBB, A. 1999. Multi-species feeding associations in north sea seabirds: jointly exploiting a patchy environment. Ardea 87: 177-198.
CARVALHO, P.C. 2018. Coexistence of two sympatric migratory shearwater species during their non-breeding season on the east coast of Newfoundland. PhD Thesis. Winnipeg, Canada: University of Manitoba.
CARVALHO, P.C. & DAVOREN, G.K. 2019. Associations of non-breeding shearwater species on the northeastern Newfoundland coast. Marine Ecology Progress Series 627: 1-12.
CARVALHO, P.C. & DAVOREN, G.K. 2020. Niche dynamics of sympatric non-breeding shearwaters under varying prey availability. Ibis 162: 701-712 doi:10.1111/ibi.12783
CHILTON, G. & SEALY, S.G. 1987. Species roles in mixed-species feeding flocks of seabirds. Journal of Field Ornithology 58: 456-463.
CROOK, K.A., MAXNER, E. & DAVOREN, G.K. 2017. Temperature-based spawning habitat selection by Capelin (Mallotus villosus) in Newfoundland. ICES Journal of Marine Science 74: 1622-1629. doi:10.1093/icesjms/fsx023
CROXALL, J.P., BUTCHART, S.H.M., LASCELLES, B.ET AL. 2012. Seabird conservation status, threats and priority actions: A global assessment. Bird Conservation International 22: 1-34. doi:10.1017/S0959270912000020
DAVOREN, G., MAY, C., PENTON, P. ET AL. 2008. An ecosystem-based research program for capelin (Mallotus villosus) in the northwest Atlantic: overview and results. Journal of Northwest Atlantic Fishery Science 39: 35-48. doi:10.2960/J.v39.m595
DAVOREN, G.K. 2013. Distribution of marine predator hotspots explained by persistent areas of prey. Marine Biology 160: 3043-3058. doi:10.1007/s00227-013-2294-5
FERRARI, S. & CRIBARI-NETO, F. 2004. Beta regression for modelling rates and proportions. Journal of Applied Statistics 31: 799-815. doi:10.1080/0266476042000214501
GARTHE, S. & HÜPPOP, O. 1998. Foraging success, kleptoparasitism and feeding techniques in scavenging seabirds: does crime pay? Helgoländer Meeresuntersuchungen 52: 187-196. doi:10.1007/BF02908747
GONZÁLEZ-ZEVALLOS, D. & YORIO, P. 2011. Consumption of discards and interactions between Black-browed Albatrosses (Thalassarche melanophrys) and Kelp Gulls (Larus dominicanus) at trawl fisheries in Golfo San Jorge, Argentina. Journal of Ornithology 152: 827-838. doi:10.1007/s10336-011-0657-6
GROVER, J.J.. & OLLA, B.L. 1983. The role of the Rhinoceros Auklet (Cerorhinca monocerata) in mixed-species feeding assemblages of seabirds in the Strait of Juan de Fuca, Washington. The Auk 100: 979-982.
HOFFMAN, W., HEINEMANN, D. & WIENS, J.A. 1981. The ecology of seabird feeding flocks in Alaska. The Auk 98: 437-456.
HOWELL, S.N.G. 2010. Molt in North American birds. New York, USA: Houghton Mifflin Harcourt.
HUDSON, A. V. & FURNESS, R.W. 1988. Utilization of discarded fish by scavenging seabirds behind whitefish trawlers in Shetland. Journal of Zoology 215: 151-166. doi:10.1111/j.1469-7998.1988.tb04890.x
HUNT, G.L., MEHLUM, F., RUSSELL, R.W., IRONS, D., DECKER, M.B. & BECKER, H. 1999. Physical processes, prey abundance, and the foraging ecology of seabirds. In: N.J. ADAMS & R.H. SLOTOW (Eds.) Proceedings of the 22nd International Ornithological Congress, Durban. Johannesburg, South Africa: BirdLife South Africa
JIMÉNEZ, S., DOMINGO, A., ABREU, M. & BRAZEIRO, A. 2011. Structure of the seabird assemblage associated with pelagic longline vessels in the southwestern Atlantic: implications for bycatch. Endangered Species Research 15: 241-254. doi:10.3354/esr00378
LEWISON, R.L. & CROWDER, L.B. 2003. Estimating fishery bycatch and effects on a vulnerable seabird population. Ecological Applications 13: 743-753.
LEWISON, R.L., CROWDER, L.B., WALLACE, B.P. ET AL. 2014. Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots. Proceedings of the National Academy of Sciences 111: 5271-5276. doi:10.1073/pnas.1318960111
MANISCALCO, J.M., OSTRAND, W.D., SURYAN, R.M. & IRONS, D.B. 2001. Passive interference competition by glaucous-winged gulls on black-legged kittiwakes: a cost of feeding in flocks. The Condor 103: 616-619. doi:10.1650/0010-5422(2001)103[0616:PICBGW]2.0.CO;2
MAYNARD, L.D., CARVALHO, P.C. & DAVOREN, G.K. 2020. Seabirds vary responses to supplemental food under dynamic natural prey availability and feeding aggregation composition. The Auk 137: 1-13. doi:10.1093/auk/ukz062
NAVARRO, J., LOUZAO, M., IGUAL, J.M., et al. 2009. Seasonal changes in the diet of a critically endangered seabird and the importance of trawling discards. Marine Biology 156: 2571-2578. doi:10.1007/s00227-009-1281-3
OLMOS, F. 1997. Seabirds attending bottom long-line fishing off southeastern Brazil. Ibis 139: 685-691.
ORO, D. & RUIZ, X. 1997. Exploitation of trawler discards by breeding seabirds in the north-western Mediterranean: Differences between the Ebro Delta and the Balearic Islands areas. ICES Journal of Marine Science 54: 695-707. doi:10.1006/jmsc.1997.0246
PARK, T. 1962. Beetles, competition and populations. Science 138: 1369-1375.
PIKITCH, E.K., ROUNTOS, K.J., ESSINGTON, T.E. ET AL. 2014. The global contribution of forage fish to marine fisheries and ecosystems. Fish and Fisheries 15: 43-64. doi:10.1111/faf.12004
RAYMOND, B., SHAFFER, S.A., SOKOLOV, S. ET AL. 2010. Shearwater foraging in the Southern Ocean: the roles of prey availability and winds. PLoS One 5: e10960. doi:10.1371/journal.pone.0010960
RONCONI, R.A, RYAN, P.G. & ROPERT-COUDERT, Y. 2010. Diving of great shearwaters (Puffinus gravis) in cold and warm water regions of the South Atlantic Ocean. PLoS One 5: e15508. doi:10.1371/journal.pone.0015508
RONCONI, R.A., SWAIM, Z.T., LANE, H.A., HUNNEWELL, R.W., WESTGATE, A.J. & KOOPMAN, H.N. 2010. Modified hoop-net techniques for capturing birds at sea and comparison with other capture methods. Marine Ornithology 38: 23-29.
SAGAR, P.M. & SAGAR, J.L. 1989. The effects of wind and sea on the feeding of Antarctic Terns at the Snares Islands. Notornis 36: 171-182.
SCHOENER, T.W. 1983. Field experiments on interspecific competition. The American Naturalist 122: 240-285.
SHAFFER, S., WEIMERSKIRCH, H., SCOTT, D. ET AL. 2009. Spatiotemporal habitat use by breeding sooty shearwaters Puffinus griseus. Marine Ecology Progress Series 391: 209-220. doi:10.3354/meps07932
SIH, A., BELL, A. & JOHNSON, J.C. 2004. Behavioral syndromes: an ecological and evolutionary overview. Trends in Ecology and Evolution 19: 372-378. doi:10.1016/j.tree.2004.04.009
SPEAR, L.B., AINLEY, D.G., & WALKER, W.A. 2007. Trophic relationships of seabirds in the eastern Pacific Ocean. Studies in Avian Biology 35: 1-99.
THIEBAULT, A., MULLERS, R.H.E., PISTORIUS, P.A. & TREMBLAY, Y. 2014. Local enhancement in a seabird: Reaction distances and foraging consequence of predator aggregations. Behavioral Ecology 25: 1302-1310. doi:10.1093/beheco/aru132
WORM, B., LOTZE, H.K. & MYERS, R.A. 2003. Predator diversity hotspots in the blue ocean. Proceedings of the National Academy of Sciences 100: 9884-9888. doi:10.1073/pnas.1333941100
YORIO, P. & CAILLE, G. 1999. Seabird interactions with coastal fisheries in Northern Patagonia: Use of discards and incidental captures in nets. Waterbirds 22: 207-216.