Mercury effects on predator avoidance behavior of a forage fish, golden shiner (Notemigonus crysoleucas)

In 2005 and 2009, two species of Cyprinidae, the Northern Redbelly Dace, Phoxinus eos, and the Golden Shiner, Notemigonus crysoleucas, were collected northeast of their know range, in Québec. These new records, indeed range extensions, are presented here with a short discussion on the fish fauna of the area and on the possibility of introductions.En 2005 et en 2009, deux espèces de Cyprinidés, soit le Méné ventre-rouge, Phoxinus eos, et le Méné jaune, Notemigonus crysoleucas, ont été capturées au nord-est de leur répartition connue au Québec. Ces nouvelles mentions, qui constituent des extensions d'aire, sont ici présentées de même qu'une courte discussion sur l'ichtyofaune de la région et la possibilité d'introductions.

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Suspected Ulcer Disease in the Golden Shiner, Notemigonus Crysoleucas (Mitchill)

The Progressive Fish-Culturist ◽

10.1577/1548-8659(1954)16[87:suditg]2.0.co;2 ◽

1954 ◽

Vol 16 (2) ◽

pp. 87-88 ◽

Cited By ~ 1

Author(s):

George A. Schuster ◽

William M. Lewis

Keyword(s):

Ulcer Disease ◽

Golden Shiner ◽

Notemigonus Crysoleucas

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Fat Affects Predator-Avoidance Behavior in Gray Catbirds (Dumetella Carolinensis) During Migratory Stopover

The Auk ◽

10.1093/auk/123.4.1069 ◽

2006 ◽

Vol 123 (4) ◽

pp. 1069-1076 ◽

Cited By ~ 1

Author(s):

David A. Cimprich ◽

Frank R. Moore

Keyword(s):

Avoidance Behavior ◽

Predator Avoidance ◽

Subcutaneous Fat ◽

Flight Performance ◽

Long Distance ◽

Fat Reserves ◽

Dumetella Carolinensis ◽

Model Treatment ◽

Migrant Birds ◽

Migratory Stopover

Abstract During migration, birds may store large quantities of fat to fuel long-distance flight. Because mass affects flight performance, fat migrants should behave with greater caution toward aerial predators than lean migrants. We tested a prediction of this hypothesis, namely, that fat birds will remain motionless longer than lean birds after a simulated encounter with a raptor. We captured Gray Catbirds (Dumetella carolinensis) during fall migration, classified their subcutaneous fat, exposed them to a model hawk, and then recorded the time until their first perch change. To determine whether the birds treated the simulated predator as a threat, we also tested them with a hexagon-shaped model and with no model. The birds remained motionless longer with the hawk model than either of the two other treatments. Fat birds remained motionless longer than lean birds when exposed to the hawk model, but we detected no difference with the other two treatments. These results provide evidence that fat affects the predator-avoidance behavior of Gray Catbirds during migratory stopover. That a difference between fat and lean groups was only apparent with the hawk model treatment suggests that the result is attributable to differences in the flight performance of the two groups rather than simply a difference in motivation to begin foraging. We suggest that fat should influence the behavior of a wide variety of migrant birds, particularly those species that typically carry greater fat reserves or that forage in more exposed situations than the Gray Catbirds we tested. La Grasa Afecta el Comportamiento de Evasión de Depredadores en Dumetella carolinensis durante las Paradas Migratorias

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