Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge?
Bay anchovy are known to be an important component of food webs in estuarine and coastal waters along the US east coast. Despite their role as a primary forage species for several top-level predators in these systems, very little is known about their behavioral interactions with predators and the vu...
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ftcarolinadr:cdr.lib.unc.edu:vd66w844b 2023-09-05T13:21:44+02:00 Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? Scharf, Frederick S. Buckel, Jeffrey A. Juanes, Francis 2002 https://doi.org/10.17615/ytz4-q568 https://cdr.lib.unc.edu/downloads/hm50v1632?file=thumbnail https://cdr.lib.unc.edu/downloads/hm50v1632 English eng https://doi.org/10.17615/ytz4-q568 https://cdr.lib.unc.edu/downloads/hm50v1632?file=thumbnail https://cdr.lib.unc.edu/downloads/hm50v1632 http://rightsstatements.org/vocab/InC/1.0/ Marine Ecology - Progress Series, 233 Marine environment Atlantic Ocean Trophic factor Body size North Atlantic Predator Vulnerability Pisces Réponse fonctionnelle Predator efficiency Functional response Feeding preference Predator prey relation Predatory behavior Capture rate Etude expérimentale Larva Vertebrata Efficacité prédatrice Long Island Sound Taux capture Experimental study Article 2002 ftcarolinadr https://doi.org/10.17615/ytz4-q568 2023-08-19T22:25:17Z Bay anchovy are known to be an important component of food webs in estuarine and coastal waters along the US east coast. Despite their role as a primary forage species for several top-level predators in these systems, very little is known about their behavioral interactions with predators and the vulnerability of post-larval life stages to predation. In this study, we examined the vulnerability of juvenile bay anchovy to age-0 bluefish predation using a size-structured laboratory design. For a range of bay anchovy and bluefish body sizes, we determined predator capture success, handling time costs, feeding rates, and prey profitabilities as functions of relative prey size. We evaluated bluefish size selection when offered different sizes of bay anchovy simultaneously and identified behavioral characteristics of prey that may contribute to disparate rates of attack. Bluefish capture success was high on small relative prey sizes (< 30% of predator size) and remained high on larger relative prey sizes (> 50% of predator size), demonstrating that even large bay anchovy are highly susceptible to capture. Handling time and capture success relationships were combined with prey body mass to generate dome-shaped profitability curves that peaked at relative prey sizes of 0.50, which is much higher than typically observed for piscivore-prey interactions. Bluefish exhibited strong selection patterns and significantly higher attack rates on large bay anchovy. Disparate attack distributions on large and small bay anchovy appeared to be caused partly by differences in prey behavior among size groups. Our results suggest that bay anchovy may not achieve a refuge from predation with increased body size and support the importance of predation in shaping bay anchovy life history. Article in Journal/Newspaper North Atlantic Carolina Digital Repository (UNC - University of North Carolina) Long Island Long Island Sound ENVELOPE(-79.366,-79.366,54.800,54.800) Small Bay ENVELOPE(-36.783,-36.783,-54.117,-54.117) |
institution |
Open Polar |
collection |
Carolina Digital Repository (UNC - University of North Carolina) |
op_collection_id |
ftcarolinadr |
language |
English |
topic |
Marine environment Atlantic Ocean Trophic factor Body size North Atlantic Predator Vulnerability Pisces Réponse fonctionnelle Predator efficiency Functional response Feeding preference Predator prey relation Predatory behavior Capture rate Etude expérimentale Larva Vertebrata Efficacité prédatrice Long Island Sound Taux capture Experimental study |
spellingShingle |
Marine environment Atlantic Ocean Trophic factor Body size North Atlantic Predator Vulnerability Pisces Réponse fonctionnelle Predator efficiency Functional response Feeding preference Predator prey relation Predatory behavior Capture rate Etude expérimentale Larva Vertebrata Efficacité prédatrice Long Island Sound Taux capture Experimental study Scharf, Frederick S. Buckel, Jeffrey A. Juanes, Francis Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? |
topic_facet |
Marine environment Atlantic Ocean Trophic factor Body size North Atlantic Predator Vulnerability Pisces Réponse fonctionnelle Predator efficiency Functional response Feeding preference Predator prey relation Predatory behavior Capture rate Etude expérimentale Larva Vertebrata Efficacité prédatrice Long Island Sound Taux capture Experimental study |
description |
Bay anchovy are known to be an important component of food webs in estuarine and coastal waters along the US east coast. Despite their role as a primary forage species for several top-level predators in these systems, very little is known about their behavioral interactions with predators and the vulnerability of post-larval life stages to predation. In this study, we examined the vulnerability of juvenile bay anchovy to age-0 bluefish predation using a size-structured laboratory design. For a range of bay anchovy and bluefish body sizes, we determined predator capture success, handling time costs, feeding rates, and prey profitabilities as functions of relative prey size. We evaluated bluefish size selection when offered different sizes of bay anchovy simultaneously and identified behavioral characteristics of prey that may contribute to disparate rates of attack. Bluefish capture success was high on small relative prey sizes (< 30% of predator size) and remained high on larger relative prey sizes (> 50% of predator size), demonstrating that even large bay anchovy are highly susceptible to capture. Handling time and capture success relationships were combined with prey body mass to generate dome-shaped profitability curves that peaked at relative prey sizes of 0.50, which is much higher than typically observed for piscivore-prey interactions. Bluefish exhibited strong selection patterns and significantly higher attack rates on large bay anchovy. Disparate attack distributions on large and small bay anchovy appeared to be caused partly by differences in prey behavior among size groups. Our results suggest that bay anchovy may not achieve a refuge from predation with increased body size and support the importance of predation in shaping bay anchovy life history. |
format |
Article in Journal/Newspaper |
author |
Scharf, Frederick S. Buckel, Jeffrey A. Juanes, Francis |
author_facet |
Scharf, Frederick S. Buckel, Jeffrey A. Juanes, Francis |
author_sort |
Scharf, Frederick S. |
title |
Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? |
title_short |
Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? |
title_full |
Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? |
title_fullStr |
Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? |
title_full_unstemmed |
Size-dependent vulnerability of juvenile bay anchovy Anchoa mitchilli to bluefish predation: Does large body size always provide a refuge? |
title_sort |
size-dependent vulnerability of juvenile bay anchovy anchoa mitchilli to bluefish predation: does large body size always provide a refuge? |
publishDate |
2002 |
url |
https://doi.org/10.17615/ytz4-q568 https://cdr.lib.unc.edu/downloads/hm50v1632?file=thumbnail https://cdr.lib.unc.edu/downloads/hm50v1632 |
long_lat |
ENVELOPE(-79.366,-79.366,54.800,54.800) ENVELOPE(-36.783,-36.783,-54.117,-54.117) |
geographic |
Long Island Long Island Sound Small Bay |
geographic_facet |
Long Island Long Island Sound Small Bay |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Marine Ecology - Progress Series, 233 |
op_relation |
https://doi.org/10.17615/ytz4-q568 https://cdr.lib.unc.edu/downloads/hm50v1632?file=thumbnail https://cdr.lib.unc.edu/downloads/hm50v1632 |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.17615/ytz4-q568 |
_version_ |
1776202309282299904 |