scholarly journals Plankton tethering to assess spatial patterns of predation risk over a coral reef and seagrass bed

2002 ◽  
Vol 225 ◽  
pp. 17-28 ◽  
Author(s):  
SG Bullard ◽  
ME Hay
Keyword(s):  
Coral Reef ◽  
Predation Risk ◽  
Spatial Patterns ◽  
Seagrass Bed

scholarly journals Pair formation, home range, and spatial variation in density, size and social status in blotched foxfaceSiganus unimaculatuson an Okinawan coral reef

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1280 ◽  
Author(s):  
Atsushi Nanami
Keyword(s):  
Coral Reef ◽  
Home Range ◽  
Spatial Variation ◽  
Reef Flat ◽  
Pair Formation ◽  
Size Class ◽  
Reef Slope ◽  
Rocky Reef ◽  
Seagrass Bed ◽  
Agonistic Display

The present study examined pair formation, spatial pattern of home range and spatial variation in density, size and social status of blotched foxfaceSiganus unimaculatus(family Siganidae) on an Okinawan coral reef. Of 32 pairs sampled for sexing, 31 (96.9%) were heterosexual and showed size-assortative pairing. Developed ovaries were found in April and July, whereas oocytes were immature in August, September and February. Heterosexual pairing was found in both reproductive and non-reproductive periods. Home range size tended to be positively related to fork length (FL). The degree of home range overlap for same size class pairs was smaller than that for different size class pairs. The intraspecific behavior when two pairs approached each other was categorized as ‘attack,’ ‘agonistic display’ and ‘no interactions,’ and the frequency of agonistic behaviors (“attack” or “agonistic display”) was significantly greater than “no interactions.” Underwater observations at a seagrass bed, a rocky reef flat and a sheltered reef slope revealed that the mean FL was significantly smaller at the sheltered reef slope (4–13 cm) than at the rocky reef flat (>13 cm). No individuals were found in the seagrass bed. Most individuals less than 6 cm FL were solitary, whereas most individuals over 7 cm FL were paired. Density was significantly greater on the sheltered reef slope than on the rocky reef flat.

scholarly journals Is it safe to nest near bold neighbours? Spatial patterns in predation risk associated with the density of American Golden-Plover nest

2016 ◽  
Author(s):  
Marie-Andrée Giroux ◽  
Myriam Trottier-Paquet ◽  
Joël Bêty ◽  
Vincent Lamarre ◽  
Nicolas Lecomte
Keyword(s):  
Predation Risk ◽  
Spatial Patterns ◽  
Bird Species ◽  
Artificial Nests ◽  
Species Of Conservation Concern ◽  
Composition And Structure ◽  
Negative Effect ◽  
Conservation Concern ◽  
Golden Plover ◽  
Mobbing Behaviour

Predation is one of the main factors explaining nesting mortality in most bird species. Birds can avoid nest predation or reduce predation pressure by breeding at higher latitude, showing anti-predator behaviour, and nesting in association with protective species. Plovers actively defend their territory by displaying early warning and aggressive/mobbing behaviour, potentially benefiting the neighbouring nests by decreasing their predation risk. To test for the existence of such a protective effect, we studied the influence of proximity to plover nests on predation risk of artificial nests on Igloolik Island (Nunavut, Canada) in July 2014. We predicted that the predation risk of artificial nests increases and decreases with the distance to and the density of plover nests, respectively. We monitored 18 plover nests and set 35 artificial nests at 30, 50, 100, 200 and 500 m from seven of those plover nests. Surprisingly, we showed that predation risk of artificial nests increases with the density of active plover nests. We also found a significant negative effect of the distance to the nearest active protector nest on predation risk of artificial nests. Understanding how the composition and structure of shorebird communities generate spatial patterns in predation risks represent a key step to better understand the importance of these species of conservation concern in tundra food webs.

scholarly journals Increase in predation risk and trophic level induced by nocturnal visits of piscivorous fishes in a temperate seagrass bed

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Jun Shoji ◽  
Hiromichi Mitamura ◽  
Kotaro Ichikawa ◽  
Hikari Kinoshita ◽  
Nobuaki Arai
Keyword(s):  
Predation Risk ◽  
Trophic Level ◽  
Seagrass Bed

Hawai'i Coral Reef Assessment and Monitoring Program: Spatial Patterns and Temporal Dynamics in Reef Coral Communities

2004 ◽  
Vol 58 (2) ◽  
pp. 159-174 ◽  
Author(s):  
P. L. (Paul L.) Jokiel ◽  
Eric K. Brown ◽  
Alan Friedlander ◽  
S. Ku'ulei Rodgers ◽  
William R. Smith
Keyword(s):  
Coral Reef ◽  
Spatial Patterns ◽  
Temporal Dynamics ◽  
Monitoring Program ◽  
Reef Coral ◽  
Coral Communities ◽  
Assessment And Monitoring

scholarly journals Spatial patterns of self-recruitment of a coral reef fish in relation to island-scale retention mechanisms

2016 ◽  
Vol 25 (20) ◽  
pp. 5203-5211 ◽  
Author(s):  
Ricardo Beldade ◽  
Sally J. Holbrook ◽  
Russell J. Schmitt ◽  
Serge Planes ◽  
Giacomo Bernardi
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Spatial Patterns ◽  
Coral Reef Fish ◽  
Retention Mechanisms

Indirect effects of asymmetrical competition among top predators determine spatial patterns of predation risk for prey

2014 ◽  
Vol 76 (4) ◽  
pp. 543-552 ◽  
Author(s):  
Angélique Dupuch ◽  
Andrea Bertolo ◽  
Pierre Magnan ◽  
Lawrence M. Dill
Keyword(s):  
Predation Risk ◽  
Spatial Patterns ◽  
Indirect Effects ◽  
Top Predators ◽  
Asymmetrical Competition

scholarly journals Is it safe to nest near conspicuous neighbours? Spatial patterns in predation risk associated with the density of American Golden-Plover nests

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2193 ◽  
Author(s):  
Marie-Andrée Giroux ◽  
Myriam Trottier-Paquet ◽  
Joël Bêty ◽  
Vincent Lamarre ◽  
Nicolas Lecomte
Keyword(s):  
Predation Risk ◽  
Spatial Patterns ◽  
Bird Species ◽  
Antipredator Behaviour ◽  
Artificial Nests ◽  
Nest Sites ◽  
Species Of Conservation Concern ◽  
Composition And Structure ◽  
Negative Effect ◽  
Conservation Concern

Predation is one of the main factors explaining nesting mortality in most bird species. Birds can avoid nest predation or reduce predation pressure by breeding at higher latitude, showing anti-predator behaviour, selecting nest sites protected from predators, and nesting in association with protective species. American Golden-Plovers (Pluvialis dominica) defend their territory by using various warning and distraction behaviours displayed at varying levels of intensity (hereafter “conspicuous behaviour”), as well as more aggressive behaviours such as aerial attacks, but only in some populations. Such antipredator behaviour has the potential to repel predators and thus benefit the neighbouring nests by decreasing their predation risk. Yet, conspicuous behaviour could also attract predators by signalling the presence of a nest. To test for the existence of a protective effect associated with the conspicuous antipredator behaviour of American Golden-Plovers, we studied the influence of proximity to plover nests on predation risk of artificial nests on Igloolik Island (Nunavut, Canada) in July 2014. We predicted that the predation risk of artificial nests would decrease with proximity to and density of plover nests. We monitored 18 plover nests and set 35 artificial nests at 30, 50, 100, 200, and 500 m from seven of those plover nests. We found that the predation risk of artificial nests increases with the density of active plover nests. We also found a significant negative effect of the distance to the nearest active protector nest on predation risk of artificial nests. Understanding how the composition and structure of shorebird communities generate spatial patterns in predation risks represents a key step to better understand the importance of these species of conservation concern in tundra food webs.

Sign in / Sign up

Export Citation Format

Share Document