scholarly journals Reactions of a colonial seabird species to controlled gunshot disturbance experiments

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Aili Lage Labansen ◽  
Flemming Merkel ◽  
Anders Mosbech
Keyword(s):  
Seabird Species ◽  
Colonial Seabird

scholarly journals Inter-Specific and Intra-Specific Competition of Two Sympatrically Breeding Seabirds, Chinstrap and Gentoo Penguins, at Two Neighboring Colonies

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 482
Author(s):  
Won Young Lee ◽  
Seongseop Park ◽  
Kil Won Kim ◽  
Jeong-Hoon Kim ◽  
Jong-Ku Gal ◽  
...  
Keyword(s):  
Isotope Analysis ◽  
Niche Partitioning ◽  
Limited Resources ◽  
Isotopic Niche ◽  
Seabird Species ◽  
Δ13c And Δ15n ◽  
Foraging Area ◽  
Colonial Seabird ◽  
Gps Tracks ◽  
Colony Level

Theory predicts that sympatric predators compete for food under conditions of limited resources. Competition would occur even within the same species, between neighboring populations, because of overlapping foraging habits. Thus, neighboring populations of the same species are hypothesized to face strong competition. To test the hypothesis that intra-specific competition is more intense than inter-specific competition owing to a lack of niche partitioning, we estimated the foraging area and diving depths of two colonial seabird species at two neighboring colonies. Using GPS and time-depth recorders, we tracked foraging space use of sympatric breeding Chinstrap and Gentoo penguins at Ardley Island (AI) and Narębski Point (NP) at King George Island, Antarctica. GPS tracks showed that there was a larger overlap in the foraging areas between the two species than within each species. In dive parameters, Gentoo penguins performed deeper and longer dives than Chinstrap penguins at the same colonies. At the colony level, Gentoo penguins from NP undertook deeper and longer dives than those at AI, whereas Chinstrap penguins did not show such intra-specific differences in dives. Stable isotope analysis of δ13C and δ15N isotopes in blood demonstrated both inter- and intra-specific differences. Both species of penguin at AI exhibited higher δ13C and δ15N values than those at NP, and in both locations, Gentoo penguins had higher δ13C and lower δ15N values than Chinstrap penguins. Isotopic niches showed that there were lower inter-specific overlaps than intra-specific overlaps. This suggests that, despite the low intra-specific spatial overlap, diets of conspecifics from different colonies remained more similar, resulting in the higher isotopic niche overlaps. Collectively, our results support the hypothesis that intra-specific competition is higher than inter-specific competition, leading to spatial segregation of the neighboring populations of the same species.

Forced nest site relocations negatively affect reproductive investment in a colonial seabird species

2020 ◽  
Vol 246 ◽  
pp. 108550 ◽  
Author(s):  
Reyes Salas ◽  
Wendt Müller ◽  
Harry Vercruijsse ◽  
Luc Lens ◽  
Eric Stienen
Keyword(s):  
Nest Site ◽  
Reproductive Investment ◽  
Seabird Species ◽  
Colonial Seabird

scholarly journals Foraging niche partitioning in sympatric seabird populations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Christina Petalas ◽  
Thomas Lazarus ◽  
Raphael A. Lavoie ◽  
Kyle H. Elliott ◽  
Mélanie F. Guigueno
Keyword(s):  
Interspecific Competition ◽  
Niche Partitioning ◽  
Niche Differentiation ◽  
Sympatric Species ◽  
Foraging Strategies ◽  
Gps Tracking ◽  
Seabird Species ◽  
Foraging Range ◽  
Common Murre ◽  
Prey Items

AbstractSympatric species must sufficiently differentiate aspects of their ecological niche to alleviate complete interspecific competition and stably coexist within the same area. Seabirds provide a unique opportunity to understand patterns of niche segregation among coexisting species because they form large multi-species colonies of breeding aggregations with seemingly overlapping diets and foraging areas. Recent biologging tools have revealed that colonial seabirds can differentiate components of their foraging strategies. Specifically, small, diving birds with high wing-loading may have small foraging radii compared with larger or non-diving birds. In the Gulf of St-Lawrence in Canada, we investigated whether and how niche differentiation occurs in four incubating seabird species breeding sympatrically using GPS-tracking and direct field observations of prey items carried by adults to chicks: the Atlantic puffin (Fratercula arctica), razorbill (Alca torda), common murre (Uria aalge), and black-legged kittiwake (Rissa tridactyla). Although there was overlap at foraging hotspots, all species differentiated in either diet (prey species, size and number) or foraging range. Whereas puffins and razorbills consumed multiple smaller prey items that were readily available closer to the colony, murres selected larger more diverse prey that were accessible due to their deeper diving capability. Kittiwakes compensated for their surface foraging by having a large foraging range, including foraging largely at a specific distant hotspot. These foraging habitat specialisations may alleviate high interspecific competition allowing for their coexistence, providing insight on multispecies colonial living.

Seabird and dolphin associations: do seabirds benefit from feeding in association with dusky dolphins in Patagonia?

2013 ◽  
Vol 94 (6) ◽  
pp. 1147-1153 ◽  
Author(s):  
Mariana Degrati ◽  
Silvana L. Dans ◽  
Griselda V. Garaffo ◽  
Enrique A. Crespo
Keyword(s):  
Foraging Strategy ◽  
Research Vessel ◽  
Feeding Strategies ◽  
Seabird Species ◽  
Magellanic Penguins ◽  
Dusky Dolphins ◽  
Dusky Dolphin ◽  
Mixed Groups

The objective of this study was to describe associations between several species of seabirds and dusky dolphins. We investigated during what dolphin activities seabirds were most commonly associated, and the size of flock in relation to the number of dolphins in a group. Since both seabirds and dolphins may display different feeding strategies, we also investigated if benefits differed among seabird species. Data were collected in Golfo Nuevo (42°20′S65°00′W) on-board a research vessel between 2001 and 2008. A total of 224 mixed groups of seabirds were encountered during this study. The seabird–dolphin associations were mainly observed during dusky dolphin surface feeding. Shearwaters and kelp gulls were mainly observed in flocks that were associated with dolphins, while Magellanic penguins and cormorants were mainly observed without dolphins. Seabirds may be conditioned to the foraging strategy of dolphins, since birds are associated with dolphins only during dolphin surface feeding. This association probably helped seabirds to find prey, but there were no obvious benefits to dolphins.

scholarly journals Widespread gene flow between oceans in a pelagic seabird species complex

2017 ◽  
Vol 26 (20) ◽  
pp. 5716-5728 ◽  
Author(s):  
Katherine A. Booth Jones ◽  
Malcolm A. C. Nicoll ◽  
Claire Raisin ◽  
Deborah A. Dawson ◽  
Helen Hipperson ◽  
...  
Keyword(s):  
Gene Flow ◽  
Species Complex ◽  
Seabird Species ◽  
Pelagic Seabird

scholarly journals Terrestrial and Marine Foraging Strategies of an Opportunistic Seabird Species Breeding in the Wadden Sea

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0159630 ◽  
Author(s):  
Stefan Garthe ◽  
Philipp Schwemmer ◽  
Vitor H. Paiva ◽  
Anna-Marie Corman ◽  
Heino O. Fock ◽  
...  
Keyword(s):  
Wadden Sea ◽  
Foraging Strategies ◽  
Seabird Species
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