scholarly journals Nocturnal and Diurnal Foraging Activity of Hawaiian Albatrosses Detected With a New Immersion Monitor

The Condor ◽  
2000 ◽  
Vol 102 (3) ◽  
pp. 577-584
Author(s):  
Patricia Fernández ◽  
David J. Anderson
Keyword(s):  
Hawaiian Islands ◽  
Foraging Activity ◽  
Phoebastria Immutabilis ◽  
Nocturnal Foraging ◽  
Foraging Movements ◽  
Laysan Albatross

Abstract We used a new immersion monitor to study the foraging movements of two species of albatrosses that nest in the Hawaiian Islands. The monitors showed that breeding male Black-footed Albatrosses (Phoebastria nigripes) land on the water more frequently during the day than at night. Breeding male Laysan Albatross (Phoebastria immutabilis) behavior was more variable and also showed a diurnal bias. We found no evidence of a nocturnal foraging bias in either species; in particular, these species do not seem to be limited to live capture of nocturnally available squid. Such squid may, nonetheless, contribute to the diet as a result of scavenging.

First record of Laysan Albatross (Phoebastria immutabilis) in Korea

2018 ◽  
Vol 25 (1) ◽  
pp. 19-22
Author(s):  
Jin-Won Yang ◽  
Seung-Gu Kang ◽  
Won-Ho Lee ◽  
Meong-Kyu Jeong
Keyword(s):  
First Record ◽  
Phoebastria Immutabilis ◽  
Laysan Albatross

Nocturnally constrained foraging of a lotic minnow (Rhinichthys cataractae)

1989 ◽  
Vol 67 (8) ◽  
pp. 2008-2012 ◽  
Author(s):  
Joseph M. Culp
Keyword(s):  
Seasonal Changes ◽  
Prey Availability ◽  
Diel Periodicity ◽  
Foraging Activity ◽  
Light Levels ◽  
Prey Composition ◽  
Rhinichthys Cataractae ◽  
Nocturnal Foraging ◽  
Gut Fullness ◽  
Foraging Pattern

Diel periodicity in foraging activity of the longnose dace (Rhinichthys cataractae) was determined by measuring dace activity over the stream bed, gut fullness, and the digestive state of prey items. Although most species of minnows are either diurnally or crepuscularly active, dace began foraging within 1 h after sunset with light levels near 10 lx and ceased before sunrise throughout the ice-free period. During the day few prey were taken as the dace remained under the shelter of stones. This nocturnal foraging pattern did not appear to be affected by spawning or seasonal changes in prey composition. Nocturnal foraging in dace is not likely a response to prey availability, but may be a response to avoid diel periods when salmonid competitors or visual predators are active.

scholarly journals A flyway perspective of foraging activity in Eurasian Green-winged Teal, Anas crecca crecca

2007 ◽  
Vol 85 (1) ◽  
pp. 81-91 ◽  
Author(s):  
C. Arzel ◽  
J. Elmberg ◽  
M. Guillemain
Keyword(s):  
Early Spring ◽  
Breeding Strategy ◽  
Foraging Activity ◽  
Long Distance ◽  
Time Activity ◽  
Anas Crecca ◽  
Income Breeding ◽  
Nocturnal Foraging ◽  
Anas Clypeata ◽  
Foraging Time

Time–activity budgets in the family Anatidae are available for the wintering and breeding periods. We present the first flyway-level study of foraging time in a long-distance migrant, the Eurasian Green-winged Teal, Anas crecca crecca L., 1758 (“Teal”). Behavioral data from early and late spring staging, breeding, and molting sites were collected with standardized protocols to explore differences between the sexes, seasons, and diel patterns. Teal foraging activity was compared with that of the Mallard, Anas platyrhynchos L., 1758 and Northern Shoveler, Anas clypeata L., 1758, and the potential effects of duck density and predator-caused disturbance were explored. In early spring, foraging time was moderate (50.5%) and mostly nocturnal (45%). It increased dramatically in all three species at migration stopovers and during molt, mostly because of increased diurnal foraging, while nocturnal foraging remained fairly constant along the flyway. These patterns adhere to the “income breeding” strategy expected for this species. No differences between the sexes were recorded in either species studied. Teal foraging time was positively correlated with density of Teal and all ducks present, but negatively correlated with predator disturbance. Our study suggests that Teal, in addition to being income breeders, may also be considered as income migrants; they find the energy necessary to migrate at staging sites along the flyway.

Laysan Albatross (Phoebastria immutabilis)

2009 ◽  
Author(s):  
Jill A. Awkerman ◽  
David J. Anderson ◽  
G. Causey Whittow
Keyword(s):  
Phoebastria Immutabilis ◽  
Laysan Albatross

scholarly journals Successful same-sex pairing in Laysan albatross

2008 ◽  
Vol 4 (4) ◽  
pp. 323-325 ◽  
Author(s):  
Lindsay C Young ◽  
Brenda J Zaun ◽  
Eric A VanderWerf
Keyword(s):  
Sex Ratio ◽  
Kin Selection ◽  
Rare Occurrence ◽  
Same Sex ◽  
Animal Kingdom ◽  
Monogamous Species ◽  
The Social ◽  
Phoebastria Immutabilis ◽  
Laysan Albatross

Unrelated same-sex individuals pairing together and cooperating to raise offspring over many years is a rare occurrence in the animal kingdom. Cooperative breeding, in which animals help raise offspring that are not their own, is often attributed to kin selection when individuals are related, or altruism when individuals are unrelated. Here we document long-term pairing of unrelated female Laysan albatross ( Phoebastria immutabilis ) and show how cooperation may have arisen as a result of a skewed sex ratio in this species. Thirty-one per cent of Laysan albatross pairs on Oahu were female–female, and the overall sex ratio was 59% females as a result of female-biased immigration. Female–female pairs fledged fewer offspring than male–female pairs, but this was a better alternative than not breeding. In most female–female pairs that raised a chick in more than 1 year, at least one offspring was genetically related to each female, indicating that both females had opportunities to reproduce. These results demonstrate how changes in the sex ratio of a population can shift the social structure and cause cooperative behaviour to arise in a monogamous species, and they also underscore the importance of genetically sexing monomorphic species.

Rhythmic Behaviour of the Intertidal Amphipod Bathyporeia Pelagica

1970 ◽  
Vol 50 (4) ◽  
pp. 1057-1068 ◽  
Author(s):  
A. A. Fincham
Keyword(s):  
Light Intensity ◽  
Rocky Shore ◽  
Activity Rhythm ◽  
Foraging Activity ◽  
Corophium Volutator ◽  
Inhibiting Effect ◽  
Talitrus Saltator ◽  
Nocturnal Foraging ◽  
Controlled Illumination ◽  
Effect Of Light

Several authors have studied the rhythmic behaviour of amphipods, including Papi (1955) who demonstrated an endogenous solar time sense in Talitrus saltator which was used for navigation. Talitrids were also investigated by Featherston & Maclntyre (1957) who suggested that changes in light intensity triggered the nocturnal foraging activity. Enright (1961, 1962, 1963) tested the effects of pressure, temperature, light intensity, absence of sand and shaking on rhythmic behaviour of the intertidal and in-faunal amphipod Synchelidium. The activity rhythm of Corophium volutator has been reported by Morgan (1965) in which a peak occurred on the early ebb. Various rocky shore Peracarida including species of Gammarus also perform vertical migrations into the surf at night (Jansson & Källander, 1968); the inhibiting effect of light was proven by experiments with controlled illumination.

scholarly journals Large-Scale Patterns of Molt Activation in the Flight Feathers of two Albatross Species

The Condor ◽  
2005 ◽  
Vol 107 (4) ◽  
pp. 835-848 ◽  
Author(s):  
Ann E. Edwards ◽  
Sievert Rohwer
Keyword(s):  
Large Scale ◽  
Foraging Range ◽  
Phoebastria Immutabilis ◽  
Species Specific ◽  
Outer Primary ◽  
Laysan Albatross

Abstract Laysan Albatross (Phoebastria immutabilis) and the closely-related Black-footed Albatross (P. nigripes) replace 20%–90% of their 35–41 wing flight feathers every year. Large-scale molt patterns (patterns between rather than within molt series) account for 77% of the variation in the number of flight feathers replaced. We identified four molt series: series A—the five outer primaries; series B—the five inner primaries plus four outer secondaries; series C—the middle secondaries; and series D—the inner secondaries. A fifth molt series may lie between series C and D. Each year, series A and D initiate molt, but series B and C may or may not initiate molt. The result is four “annual molt patterns”: ABCD, ABD, ACD, and AD. Temporally overlapping waves of molt never occur within series A or B, but about one third of the time they occur within series C and D. Multiple, spatially defined waves of molt (replaced feathers separated by unreplaced feathers) never occur within series A, but occur about two thirds of the time within series B, C, and D. The inner primaries and outer secondaries constitute a single molt series, probably to equilibrate between series total feather length, and thus, total molt duration. Studies of foraging range and reproduction in albatrosses would benefit from the development of species-specific indices of molt duration and extent that are biologically as well as statistically defensible. The number of outer primary feathers replaced and the number of molt series that activate molt are two such indices for Laysan and Black-footed Albatrosses.

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