Shark scavenging behavior in the presence of competition
The distribution of organisms within a community can often be determined by the degree of plasticity or degree of specialization of resource acquisition. Resource acquisition is often based on the morphology of an organism, behavior, or a combination of both. Performance tests of feeding can identif...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:bio_facpubs-1138 2023-07-30T04:07:33+02:00 Shark scavenging behavior in the presence of competition Gerry, Shannon P. Scott, Andrea J. 2010-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/bio_facpubs/133 https://digitalcommons.uri.edu/context/bio_facpubs/article/1138/viewcontent/Gerry_Scott_SharkScavenging_2010.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/bio_facpubs/133 https://digitalcommons.uri.edu/context/bio_facpubs/article/1138/viewcontent/Gerry_Scott_SharkScavenging_2010.pdf Biological Sciences Faculty Publications text 2010 ftunivrhodeislan 2023-07-17T18:57:11Z The distribution of organisms within a community can often be determined by the degree of plasticity or degree of specialization of resource acquisition. Resource acquisition is often based on the morphology of an organism, behavior, or a combination of both. Performance tests of feeding can identify the possible interactions that allow one species to better exploit a prey item. Scavenging behaviors in the presence or absence of a competitor were investigated by quantifying prey selection in a trophic generalist, spiny dogfish Squalus acanthias, and a trophic specialist, smooth-hounds Mustelus canis, in order to determine if each shark scavenged according to its jaw morphology. The diet of dogfish consists of small fishes, squid, ctenophores, and bivalves; they are expected to be nonselective predators. Smooth-hounds primarily feed on crustaceans; therefore, they are predicted to select crabs over other prey types. Prey selection was quantified by ranking each prey item according to the order it was consumed. Dietary shifts were analyzed by comparing the percentage of each prey item selected during solitary versus competitive scavenging. When scavenging alone, dogfish prefer herring and squid, which are easily handled by the cutting dentition of dogfish. Dogfish shift their diet to include a greater number of prey types when scavenging with a competitor. Smooth-hounds scavenge on squid, herring, and shrimp when alone, but increase the number of crabs in the diet when scavenging competitively. Competition causes smooth-hounds to scavenge according to their jaw morphology and locomotor abilities, which enables them to feed on a specialized resource. Text spiny dogfish Squalus acanthias University of Rhode Island: DigitalCommons@URI |
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University of Rhode Island: DigitalCommons@URI |
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The distribution of organisms within a community can often be determined by the degree of plasticity or degree of specialization of resource acquisition. Resource acquisition is often based on the morphology of an organism, behavior, or a combination of both. Performance tests of feeding can identify the possible interactions that allow one species to better exploit a prey item. Scavenging behaviors in the presence or absence of a competitor were investigated by quantifying prey selection in a trophic generalist, spiny dogfish Squalus acanthias, and a trophic specialist, smooth-hounds Mustelus canis, in order to determine if each shark scavenged according to its jaw morphology. The diet of dogfish consists of small fishes, squid, ctenophores, and bivalves; they are expected to be nonselective predators. Smooth-hounds primarily feed on crustaceans; therefore, they are predicted to select crabs over other prey types. Prey selection was quantified by ranking each prey item according to the order it was consumed. Dietary shifts were analyzed by comparing the percentage of each prey item selected during solitary versus competitive scavenging. When scavenging alone, dogfish prefer herring and squid, which are easily handled by the cutting dentition of dogfish. Dogfish shift their diet to include a greater number of prey types when scavenging with a competitor. Smooth-hounds scavenge on squid, herring, and shrimp when alone, but increase the number of crabs in the diet when scavenging competitively. Competition causes smooth-hounds to scavenge according to their jaw morphology and locomotor abilities, which enables them to feed on a specialized resource. |
format |
Text |
author |
Gerry, Shannon P. Scott, Andrea J. |
spellingShingle |
Gerry, Shannon P. Scott, Andrea J. Shark scavenging behavior in the presence of competition |
author_facet |
Gerry, Shannon P. Scott, Andrea J. |
author_sort |
Gerry, Shannon P. |
title |
Shark scavenging behavior in the presence of competition |
title_short |
Shark scavenging behavior in the presence of competition |
title_full |
Shark scavenging behavior in the presence of competition |
title_fullStr |
Shark scavenging behavior in the presence of competition |
title_full_unstemmed |
Shark scavenging behavior in the presence of competition |
title_sort |
shark scavenging behavior in the presence of competition |
publisher |
DigitalCommons@URI |
publishDate |
2010 |
url |
https://digitalcommons.uri.edu/bio_facpubs/133 https://digitalcommons.uri.edu/context/bio_facpubs/article/1138/viewcontent/Gerry_Scott_SharkScavenging_2010.pdf |
genre |
spiny dogfish Squalus acanthias |
genre_facet |
spiny dogfish Squalus acanthias |
op_source |
Biological Sciences Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/bio_facpubs/133 https://digitalcommons.uri.edu/context/bio_facpubs/article/1138/viewcontent/Gerry_Scott_SharkScavenging_2010.pdf |
_version_ |
1772820947395411968 |