Population regulation in Little Penguins (Eudyptula minor): the role of intraspecific competition for nesting sites and food during breeding

2006 ◽  
Vol 106 (4) ◽  
pp. 289-296 ◽  
Author(s):  
Peter Dann ◽  
F. I. Norman
Keyword(s):  
Intraspecific Competition ◽  
Population Regulation ◽  
Nesting Sites

scholarly journals The role of intraspecific competition between plants in a nursery pollination system—Comments on Villacañas de Castro and Hoffmeister 2020

2020 ◽  
Vol 10 (21) ◽  
pp. 11869-11874
Author(s):  
Nicolas M. Gutiérrez ◽  
Luciano Stucchi ◽  
Javier Galeano ◽  
Luis Giménez‐Benavides
Keyword(s):  
Intraspecific Competition ◽  
Pollination System ◽  
Nursery Pollination

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.

INTRASPECIFIC COMPETITION: THE ROLE OF LAGS BETWEEN ATTACK AND DEATH IN HOST–PARASITOID INTERACTIONS

Ecology ◽  
2007 ◽  
Vol 88 (5) ◽  
pp. 1225-1231 ◽  
Author(s):  
T. C. Cameron ◽  
D. Metcalfe ◽  
A. P. Beckerman ◽  
S. M. Sait
Keyword(s):  
Intraspecific Competition

Nesting snakes (Tropidonophis mairii, Colubridae) selectively oviposit in sites that provide evidence of previous successful hatching

2005 ◽  
Vol 83 (8) ◽  
pp. 1134-1137 ◽  
Author(s):  
Gregory P Brown ◽  
Richard Shine
Keyword(s):  
Parental Care ◽  
Site Selection ◽  
Potential Role ◽  
Oviposition Site ◽  
Oviposition Site Selection ◽  
Egg Predator ◽  
Nesting Sites ◽  
In Captivity ◽  
Tropical Australia

In oviparous species without parental care, nesting females must select an oviposition site that provides incubation conditions favourable to the developing eggs. Abiotic cues (e.g., temperature, moisture) are well known to influence oviposition-site selection, but the potential role of biotic cues (e.g., the presence of eggshells from previous successfully hatched clutches or the scent of egg predators) has rarely been examined in this respect. To test whether nesting females use such cues, we collected gravid keelback snakes (Tropidonophis mairii (Gray, 1841), Colubridae) in tropical Australia and gave them a choice of potential nesting sites in captivity. Females selectively oviposited in sites containing empty eggshells rather than in control sites but did not avoid the scent of a sympatric egg predator (the slatey-grey snake, Stegonotus cucullatus (Duméril, Bibron and Duméril, 1854)); indeed, eggshells of this taxon were as effective as keelback eggs in attracting oviposition. Our study adds to growing evidence that nesting females assess and respond to a diverse array of biotic as well as abiotic cues that predict the probability of successful incubation for their eggs.

A field study of settlement behaviour in Balanus balanoides and Elminius modestus (Cirripedia: Crustacea) in relation to competition between them

1979 ◽  
Vol 59 (3) ◽  
pp. 575-580 ◽  
Author(s):  
B. E. Barnett ◽  
S. C. Edwards ◽  
D. J. Crisp
Keyword(s):  
Field Study ◽  
Growth Rates ◽  
Intraspecific Competition ◽  
Intertidal Zone ◽  
South West ◽  
Competition For Space ◽  
Balanus Balanoides ◽  
Settlement Behaviour

There can be little doubt that competition for space, both inter- and intraspecific is a major factor in barnacle ecology. Southward & Crisp (1956) first pointed out the role of competition between Balanus balanoides (L.) and Chthamalus stellatus (Poli) in south-west Britain which Connell (1959, 1961) later demonstrated experimentally. Crisp (1958) discussed competition between the indigenous B. balanoides and the immigrant Elminius modestus Darwin in the intertidal zone, and measurements of growth rates, using manipulated populations of these two species, indicated that inter- and intraspecific competition for space after settlement is intense (Crisp, 1964).

POPULATION REGULATION IN AN AQUATIC INSECT: THE ROLE OF DISEASE

Ecology ◽  
2001 ◽  
Vol 82 (8) ◽  
pp. 2294-2305 ◽  
Author(s):  
Steven L. Kohler ◽  
Wade K. Hoiland
Keyword(s):  
Population Regulation ◽  
Aquatic Insect
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