Results 171 to 180 of about 7,920 (201)
Some of the next articles are maybe not open access.
Estimating Mercury Exposure of Piscivorous Birds and Sport Fish Using Prey Fish Monitoring
Environmental Science & Technology, 2015Methylmercury is a global pollutant of aquatic ecosystems, and monitoring programs need tools to predict mercury exposure of wildlife. We developed equations to estimate methylmercury exposure of piscivorous birds and sport fish using mercury concentrations in prey fish. We collected original data on western grebes (Aechmophorus occidentalis) and Clark'
Joshua T, Ackerman +6 more
openaire +4 more sources
FACTORS INFLUENCING THE ABUNDANCE OF PISCIVOROUS BIRDS ON LAKE KYLE, ZIMBABWE
Ostrich, 1987Summary Junor, F. J. R. & Marshall, B. E. 1987. Factors influencing the abundance of piscivorous birds on Lake Kyle, Zimbabwe. Ostrich 58:168-175. A five-year census of fish-eating birds on Lake Kyle, Zimbabwe, revealed that eight species were present in significant numbers with the Reed Cormorant being the most abundant.
F. J. R. Junor, B. E. Marshall
openaire +3 more sources
FEEDING ECOLOGY OF PISCIVOROUS BIRDS AT LAKE ST LUCIA, Part 1: Diving Birds
Ostrich, 1978A. K. Whitfield, S. J. M. Blaber
openaire +3 more sources
Netherlands Journal of Sea Research, 1984
Since 1971, when the Grevelingen estuary was turned into a 108 km2 saline lake, the number of foraging piscivorous birds has increased significantly. Up to 7000 to 10 000 Great Crested Grebes may be present on the lake, representing about half of the northwestern European breeding population.
openaire +3 more sources
Since 1971, when the Grevelingen estuary was turned into a 108 km2 saline lake, the number of foraging piscivorous birds has increased significantly. Up to 7000 to 10 000 Great Crested Grebes may be present on the lake, representing about half of the northwestern European breeding population.
openaire +3 more sources
Digeneans Collected from Piscivorous Birds in North Carolina, U.S.A
Comparative Parasitology, 2004During investigations of digenetic fluke diseases of aquaculture fish, 11 digeneans (Apharyngostrigea simplex, Apharyngostrigea cornu, Diplostomum compactum, Diplostomum spathaceum, Posthodiplostomum minimum, Hysteromorpha triloba, Clinostomum marginatum, Drepanocephalus spathans, Mesorchis denticulatus, Microparyphium facetum, and Notocotylus pacifera)
James R. Flowers +3 more
openaire +1 more source
ECOSYSTEM-BASED MANAGEMENT OF PREDATOR–PREY RELATIONSHIPS: PISCIVOROUS BIRDS AND SALMONIDS
Ecological Applications, 2008Predator-prey relationships are often altered as a result of human activities. Where prey are legally protected, conservation action may include lethal predator control. In the Columbia River basin (Pacific Northwest, USA and Canada), piscivorous predators have been implicated in contributing to a lack of recovery of several endangered anadromous ...
Francis K, Wiese +3 more
openaire +2 more sources
Journal of Natural History, 2013
Associations of birds with foraging otters are restricted to four records in different regions of the world. We report herein on piscivorous birds associated with foraging otters (Lontra longicaudis) in a pool at an urban park in southeastern Brazil. We recorded up to ˜30 individuals of seven piscivorous bird species associated with a single otter. The
Giulia B. D’Angelo, Ivan Sazima
openaire +1 more source
Associations of birds with foraging otters are restricted to four records in different regions of the world. We report herein on piscivorous birds associated with foraging otters (Lontra longicaudis) in a pool at an urban park in southeastern Brazil. We recorded up to ˜30 individuals of seven piscivorous bird species associated with a single otter. The
Giulia B. D’Angelo, Ivan Sazima
openaire +1 more source
Ecological constraints on digestive physiology in carnivorous and piscivorous birds
Journal of Experimental Zoology, 1999Digestion strategies of meat- and fish-eating birds have received little attention, and the assumption has generally been made that there is rather little variation in digestion parameters between species in these guilds. We show that there is significant though small variation between species in apparent absorption efficiency.
G.M. Hilton +4 more
openaire +1 more source
Asymmetric impact of piscivorous birds on size-structured fish populations
Canadian Journal of Zoology, 2006Fish are frequently considered the top predator in freshwater food web models despite evidence that predatory birds can impact fish populations. In this study, we quantified bird predation rates on experimental populations of rainbow trout ( Oncorhynchus mykiss (Walbaum, 1792)) created by stocking nine small lakes in British Columbia, Canada ...
Christa Beckmann +2 more
openaire +1 more source