scholarly journals Dye another day: the predatory impact of cyclopoid copepods on larval mosquitoCulex pipiensis unaffected by dyed environments

2018 ◽  
Vol 43 (2) ◽  
pp. 334-336 ◽  
Author(s):  
Ross N. Cuthbert ◽  
Amanda Callaghan ◽  
Jaimie T.A. Dick
Keyword(s):  
Predatory Impact

Predation by three glacial opportunists on natural zooplankton communities

1986 ◽  
Vol 64 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Redwood W. Nero ◽  
W. Gary Sprules
Keyword(s):  
Previous Survey ◽  
Clearance Rates ◽  
Mysis Relicta ◽  
Chydorus Sphaericus ◽  
Theoretical Comparison ◽  
Feeding Experiments ◽  
Predatory Impact ◽  
Limnocalanus Macrurus ◽  
Zooplankton Communities

We examine the influence of three glacial opportunist predators, Mysis relicta, Limnocalanus macrurus, and Senecella calanoides, on natural zooplankton communities of central Ontario through a series of feeding experiments in small enclosures (23.6 L). Estimates of in situ clearance rates by M. relicta match previously determined rates, with the following gradation of values: Asplanchna sp. > daphnids and bosminids > Epischura lacustris > large cyclopoids, Chydorus sphaericus and small Diaptomus sp. > L. macrurus > S. calanoides. Clearance rates by M. relicta are similar for all daphnids and bosminids. Hypolimnetic species like Daphnia longiremis and Eubosmina longispina are apparently eliminated by M. relicta, while similarly vulnerable species survive because they have an epilimnetic refuge from M. relicta. Limnocalanus macrurus and S. calanoides prey primarily on copepods, Diaphanosoma spp., and rotifers in the hypolimnion. When both clearance rates and population densities of M. relicta, L. macrurus, and S. calanoides are taken into account, the total predatory impact of M. relicta is much larger than that of the two relict copepods. Based on a theoretical comparison of measured clearance rates by predators with estimated rates of prey recruitment, we conclude that differences in species composition and abundance between relict and nonrelict lakes described in a previous survey are due principally to predation by M. relicta.

scholarly journals Predation of the Buffy-fronted Seedeater Sporophila frontalis (Aves: Emberizidae) on Merostachys neesii (Poaceae: Babusoideae) seeds during a masting event in the Atlantic forest

2011 ◽  
Vol 11 (3) ◽  
pp. 407-411 ◽  
Author(s):  
César Cestari ◽  
Cláudio João Bernardi
Keyword(s):  
Atlantic Forest ◽  
Predation Rate ◽  
The Other ◽  
Southeastern Brazil ◽  
Forest Species ◽  
Forest Reserve ◽  
Point Counts ◽  
Other Hand ◽  
Predatory Impact

The Buffy-fronted Seedeater Sporophila frontalis (Verreaux, 1869) is frequently found foraging on seeds during ephemeral masting events of bamboos in the Atlantic forest. In the present study, we analyzed the predation activity of S. frontalis on seeds of Merostachys neesii Rupr. during a masting event in an Atlantic forest reserve on southeastern Brazil. We conducted point counts in spots with M. neesii and in spots without bamboos along trails to determine the presence of S. frontalis on M. neesii clumps. Additionally, focal observations on bamboo clumps and seed traps were used to verify the predatory impact of S. frontalis on M. neesii seeds. S. frontalis was present in 6 out 18 point counts in M. neesii clumps. The seedeater behaved territorially in bamboo clumps and presented a mean predation rate of 1.10 bamboo seeds/minute. Seed traps had up to 80% of the seeds predated. The large amount of seeds available during bamboo masting events probably contributes to the maintenance of wandering populations of S. frontalis in the Atlantic forest. On the other hand, the predation of seeds by S. frontalis may reduce the reproductive germination and the propagation of the bamboos whose growth may in turn negatively affect the establishment of other forest species.

Comparative functional responses predict the predatory impact of the highly invasive fish Cichla kelberi

Hydrobiologia ◽  
2020 ◽  
Author(s):  
Thiago Lima Carvalho ◽  
Eveline de Almeida Ferreira ◽  
Fernando Mayer Pelicice ◽  
Rodrigo Fernandes
Keyword(s):  
Invasive Fish ◽  
Functional Responses ◽  
Predatory Impact

Predatory impact of non-native rainbow trout on endemic fish populations in headwater streams in the Cape Floristic Region of South Africa

2014 ◽  
Vol 17 (1) ◽  
pp. 365-379 ◽  
Author(s):  
Jeremy M. Shelton ◽  
Michael J. Samways ◽  
Jenny A. Day
Keyword(s):  
South Africa ◽  
Rainbow Trout ◽  
Headwater Streams ◽  
Cape Floristic Region ◽  
Fish Populations ◽  
Endemic Fish ◽  
Predatory Impact

Predatory impact of scyphomedusae on ichthyoplankton and other zooplankton in Port Phillip Bay

1988 ◽  
Vol 116 (1) ◽  
pp. 63-77 ◽  
Author(s):  
Mark S. Fancett ◽  
Greg P. Jenkins
Keyword(s):  
Predatory Impact

Invasive Cane Toads’ Predatory Impact on Dung Beetles is Mediated by Reservoir Type at Artificial Water Points

Ecosystems ◽  
2015 ◽  
Vol 18 (5) ◽  
pp. 826-838 ◽  
Author(s):  
Benjamin Feit ◽  
Tim Dempster ◽  
Heloise Gibb ◽  
Mike Letnic
Keyword(s):  
Dung Beetles ◽  
Reservoir Type ◽  
Predatory Impact ◽  
Artificial Water

Hyperbenthic and pelagic predators regulate alternate key planktonic copepods in shallow temperate estuaries

2014 ◽  
Vol 65 (9) ◽  
pp. 791 ◽  
Author(s):  
R. J. Wasserman ◽  
T. J. F. Vink ◽  
R. Kramer ◽  
P. W. Froneman
Keyword(s):  
Population Regulation ◽  
Zooplankton Community ◽  
Copepod Species ◽  
Benthic Fish ◽  
Predator Diversity ◽  
Predatory Impact ◽  
Experimental Treatments ◽  
Zooplankton Communities ◽  
Predatory Pressure

Although predation has been identified as an important community driver, the role of predator diversity in structuring estuarine zooplankton has not been assessed. As such, we investigated the effects of two different zooplanktivorous fish species on the estuarine zooplankton community during a 12-day mesocosm study. Three experimental treatments were established, whereby natural zooplankton communities were subject to either (1) no predatory pressure, (2) predation by a pelagic predator (Monodactylus falciformis) or (3) predation by a hyper-benthic predator (Glossogobius callidus). The pelagic feeding M. falciformis fed largely on the numerically dominant mid-water copepod species, Paracartia longipatella. In contrast, the hyper-benthic fish had a greater predatory impact on the less numerically dominant copepod, Pseudodiaptomus hessei, which demonstrates strong diel vertical migration. Variations in prey-population regulation are ascribed to the distinct behavioural differences of the predators, and mediated by the differences in behaviour of the copepod species.

Does a top predator reduce the predatory impact of an invasive mesopredator on an endangered rodent?

Ecography ◽  
2011 ◽  
Vol 34 (5) ◽  
pp. 827-835 ◽  
Author(s):  
Mike Letnic ◽  
Symon A. Dworjanyn
Keyword(s):  
Top Predator ◽  
Predatory Impact

scholarly journals Predatory impact of killer whales on pinniped and penguin populations at the Subantarctic Prince Edward Islands: fact and fiction

2011 ◽  
pp. no-no ◽  
Author(s):  
R. R. Reisinger ◽  
P. J. N. de Bruyn ◽  
M. N. Bester
Keyword(s):  
Killer Whales ◽  
Prince Edward Islands ◽  
Predatory Impact

Feeding of Galaxias olidus (Guenther) (Pisces: Galaxiidae) in an intermittent Australian stream

1994 ◽  
Vol 45 (2) ◽  
pp. 227 ◽  
Author(s):  
GP Closs
Keyword(s):  
Seasonal Changes ◽  
Stream Flow ◽  
Light Availability ◽  
High Flow ◽  
High Rate ◽  
Low Flow ◽  
Intermittent Streams ◽  
Feeding Rates ◽  
Seasonal Basis ◽  
Predatory Impact

Patterns of feeding in the mountain galaxiid (Galaxias olidus) were examined at dawn and dusk during low flow in April and high flow in September in an intermittent stream. During April (low flow), feeding rates were relatively low and aperiodic, whereas in September (high flow), the fish were clearly feeding diurnally at a relatively high rate. These results suggest that feeding in G. olidus in intermittent streams may vary on a daily and seasonal basis, possibly as a consequence of changes in light availability and stream flow. Light determines the ability of fish to find their prey, and seasonal changes in flow may determine the availability of prey (i.e. drifting invertebrates). This pattern suggests that the predatory impact of drift-feeding fish, such as G. olidus, is likely to be considerably less during low-flow periods when drifting invertebrates are not available than during high-flow periods when such prey may be abundant.

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