Dietary Shifts of Frog Eating Snakes in Response to Seasonal Changes in Prey Availability

2004 ◽  
Vol 38 (3) ◽  
pp. 455-460 ◽  
Author(s):  
Toshiaki Hirai
Keyword(s):  
Seasonal Changes ◽  
Prey Availability ◽  
Dietary Shifts

DIetary Shifts Based Upon Prey Availability in Peregrine Falcons and Australian Hobbies Breeding Near Canberra, Australia

2008 ◽  
Vol 42 (2) ◽  
pp. 125-137 ◽  
Author(s):  
Jerry Olsen ◽  
Esteban Fuentes ◽  
David M. Bird ◽  
A. B. Rose ◽  
David Judge
Keyword(s):  
Prey Availability ◽  
Peregrine Falcons ◽  
Dietary Shifts

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 Spatial and seasonal changes in the diet of Oligosarcus hepsetus (Characiformes, Characidae) in a Brazilian Reservoir

2005 ◽  
Vol 65 (1) ◽  
pp. 1-8 ◽  
Author(s):  
F. G Araújo ◽  
C. C Andrade ◽  
R. N Santos ◽  
A. F. G. N Santos ◽  
L. N Santos
Keyword(s):  
Seasonal Changes ◽  
Prey Capture ◽  
Gut Contents ◽  
Relative Importance ◽  
Food Items ◽  
Dietary Shifts ◽  
Index Of Relative Importance ◽  
Almost All ◽  
Previous Autumn ◽  
Very High

We assessed spatial and seasonal changes in the diet of Oligosarcus hepsetus in order to describe the strategy developed by this species that allows their very high abundance in Lajes reservoir, Rio de Janeiro, Brazil. Fish samplings were carried out using gill nets, deployed during ca. 12 and 24 hours, between April 2001 and May 2002. A total of 289 individuals were examined, of which 97 showed gut contents. We used the index of relative importance (IRI) to compare probable dietary shifts, and the frequency of occurrence (% OC) to analyze possible ontogenetic influences on feeding. O. hepsetus showed carnivorous habits, feeding preferably on fish and insects, the latter of which occurred in 71.0% of the guts presenting contents. O. hepsetus consumed different items along the three reservoir zones: insects (61.0% IRI) and Cichla monoculus (38.9% IRI) in the lower zone; Lepidoptera (57.0% IRI) in the middle zone; and C. monoculus (77.0% IRI) in the upper zone. Food items changed seasonally with C. monoculus predominating in autumn 2001, and Hymenoptera and Lepidoptera in the winter. In spring almost all food was Lepidoptera (99.8% IRI), while in the summer Hemiptera dominated in the diet. In autumn 2002 Hemiptera (97.0% IRI) was dominant, in significant contrast with the previous autumn. Individuals smaller than 190 mm SL fed heavily on insects, while fishes predominated in the diet of individuals larger than 190 mm SL. Shifts in prey-capture ability among length classes suggest decreasing intraspecific competition. A higher food plasticity seems to be the strategy employed by this opportunist species, which used food resources available in the reservoir.

Ecology of the Little Black Cormorant, Phalacrocorax sulcirostris, and Little Pied Cormorant, P. melanoleucos, in Inland New South Wales I. Food and Feeding Habits.

1979 ◽  
Vol 6 (1) ◽  
pp. 79 ◽  
Author(s):  
B Miller
Keyword(s):  
Common Carp ◽  
Seasonal Changes ◽  
Prey Availability ◽  
New South ◽  
Feeding Habits ◽  
New South Wales ◽  
Live Weight ◽  
Exotic Fish ◽  
South Wales ◽  
Food And Feeding

The food and feeding habits of two species of cormorant were studied on a group of freshwater lakes in inland New South Wales. P. sulcirostris fed mainly on exotic fish (69% of live weight of prey), captured while fishing communally in the deeper waters. P. melanoleucos fed mainly on native decapod crustaceans (60% of prey) captured while fishing individually in the shallow parts of the lakes, and in nearby billabongs and farm dams. P. sulcirostris took larger common carp Carassius auratus, redfin Perca fluviatilis and yabby Cherax destructor than its congener. Seasonal changes in the diet of P. sulcirostris were similar in each year; its major prey, common carp and redfin, were least available during winter and spring, as fry grew too large to be captured and swallowed. Changes in diet of P. melanoleucos were irregular, as the availability of yabby, its major prey, was influenced by the turbidity, level and temperature of water. Seasonal changes in diets of both cormorants were attributed to changes in prey availability, and not changes in food preference. Food of nestlings sometimes differed from that of adults.

scholarly journals 18S rRNA metabarcoding diet analysis of a predatory fish community across seasonal changes in prey availability

2019 ◽  
Vol 9 (3) ◽  
pp. 1410-1430 ◽  
Author(s):  
Justin M. Waraniak ◽  
Terence L. Marsh ◽  
Kim T. Scribner
Keyword(s):  
Seasonal Changes ◽  
Fish Community ◽  
18S Rrna ◽  
Prey Availability ◽  
Diet Analysis ◽  
Predatory Fish

scholarly journals Steller sea lion foraging response to seasonal changes in prey availability

2009 ◽  
Vol 388 ◽  
pp. 243-261 ◽  
Author(s):  
MF Sigler ◽  
DJ Tollit ◽  
JJ Vollenweider ◽  
JF Thedinga ◽  
DJ Csepp ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Prey Availability ◽  
Steller Sea Lion ◽  
Sea Lion

scholarly journals Stream acidification and reduced aquatic prey availability are associated with dietary shifts in an obligate riparian Neotropical migratory songbird

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5141 ◽  
Author(s):  
Brian K. Trevelline ◽  
Tim Nuttle ◽  
Brady A. Porter ◽  
Nathan L. Brouwer ◽  
Brandon D. Hoenig ◽  
...  
Keyword(s):  
Aquatic Insects ◽  
Prey Availability ◽  
Foraging Strategies ◽  
Neotropical Migrant ◽  
Stream Acidification ◽  
Nestling Diet ◽  
Dna Metabarcoding ◽  
Riparian Habitats ◽  
Dietary Shifts ◽  
Migratory Songbird

Streams and their surrounding riparian habitats are linked by reciprocal exchanges of insect prey essential to both aquatic and terrestrial consumers. Aquatic insects comprise a large proportion of total prey in riparian habitats and are opportunistically exploited by terrestrial insectivores; however, several species of songbirds are known to preferentially target aquatic prey via specialized foraging strategies. For these songbirds, reduced availability of aquatic insects via stream acidification may result in compensatory changes in provisioning during the nesting period, thereby influencing both adult and nestling diet composition. In this study, we used DNA metabarcoding to test the hypothesis that an obligate riparian Neotropical migratory songbird, the Louisiana Waterthrush (Parkesia motacilla), expands its diet to compensate for the loss of preferred aquatic prey taxa (primarily pollution-sensitive Ephemeroptera, Plecoptera, and Trichoptera) as a result of stream acidification. Our results revealed that both adult and nestling waterthrush exhibited an increase in dietary richness and niche breadth resulting from the consumption of terrestrial prey taxa in acidified riparian habitats. In contrast, compensatory dietary shifts were not observed in syntopic Neotropical migrant species known to primarily provision terrestrial prey taxa. In addition to providing support for our hypothesis that waterthrush compensate for stream acidification and aquatic prey limitations by expanding their diet, our findings highlight the vulnerability of Louisiana Waterthrush to anthropogenic disturbances that compromise stream quality or reduce the availability of pollution-sensitive aquatic insects.

Spreading the Word: Seasonal Changes Mean New Opportunities for Media Coverage

ASHA Leader ◽  
2013 ◽  
Vol 18 (7) ◽  
Keyword(s):  
Media Coverage ◽  
Seasonal Changes ◽  
Swimming Pools

Summer kicking into high gear conjures images of swimming pools and barbeques. But before you book your beach house for the weekend, think about what the changing seasons can mean for you professionally.

Seasonal changes in a ultraviolet structural colour signal in blue tits, Parus caeruleus

2002 ◽  
Vol 76 (2) ◽  
pp. 237-245 ◽  
Author(s):  
JONAS ORNBORG ◽  
STAFFAN ANDERSSON ◽  
SIMON C. GRIFFITH ◽  
BEN C. SHELDON
Keyword(s):  
Seasonal Changes ◽  
Parus Caeruleus ◽  
Structural Colour ◽  
Blue Tits ◽  
Colour Signal

Seasonal changes in nitrogen fractions of Pachysandra terminalis, a forest evergreen chamaephyte

1990 ◽  
Vol 79 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Fumio Yoshie ◽  
Hirohito Arai ◽  
Hideaki Nakashima ◽  
Shoichi Kawano
Keyword(s):  
Seasonal Changes ◽  
Nitrogen Fractions
Sign in / Sign up

Export Citation Format

Share Document