Social structure of long-finned pilot whales (Globicephala melas) off northern Cape Breton Island, Nova Scotia

Behaviour ◽  
2017 ◽  
Vol 154 (5) ◽  
pp. 509-540 ◽  
Author(s):  
J.F. Augusto ◽  
T.R. Frasier ◽  
H. Whitehead
Keyword(s):  
Social Structure ◽  
Pilot Whale ◽  
Detailed Model ◽  
Cape Breton Island ◽  
Long Term Stability ◽  
Cape Breton ◽  
Northern Cape ◽  
Pilot Whales ◽  
Average Size ◽  
Social Units

Cetacean social structures include fluid and stable elements. Long-finned pilot whales (Globicephala melas) live in units that interact forming labile groups. In this study conducted off Cape Breton Island, between 1998–2011, we confirm unit membership predicts associations between individuals. We determine how units are structured and interact. We delineated 21 nearly-stable social units, with an average 7 members. For units where multiple individuals are sexed, both sexes are present. Most units showed long-term stability, while one showed evidence of splitting. Three units shared individuals with the largest unit (K, average size = 29). Splitting is likely triggered by size and difficulties maintaining associations between all individuals. Pilot whales face many pressures driving sociality at a range of temporal and social scales producing a multilevel society. While we have produced a more detailed model of long-finned pilot whale social structure, there are still unanswered questions, particularly whether units are strict matrilines.

scholarly journals Occurrence and distribution of sugar maple in northern Cape Breton Island

1972 ◽  
Vol 48 (5) ◽  
pp. 246-248
Author(s):  
K. N. H. Greenidge
Keyword(s):  
Sugar Maple ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Northern Cape

not available

Magmatism and metamorphism in a Grenvillian fragment: U-Pb and 40Ar/39Ar ages from the Blair River Complex, northern Cape Breton Island, Nova Scotia, Canada

1996 ◽  
Vol 108 (2) ◽  
pp. 127-140 ◽  
Author(s):  
Brent V. Miller ◽  
Gregory R. Dunning ◽  
Sandra M. Barr ◽  
Robert P. Raeside ◽  
Rebecca A. Jamieson ◽  
...  
Keyword(s):  
Nova Scotia ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Northern Cape

Origin and Emplacement of Acadian Granitic Rocks, Northern Cape Breton Island

1975 ◽  
Vol 12 (2) ◽  
pp. 252-262 ◽  
Author(s):  
Robert A. Wiebe
Keyword(s):  
Country Rock ◽  
Source Region ◽  
Spatial Arrangement ◽  
High Water ◽  
Granitic Rocks ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Northern Cape ◽  
Areal Variation ◽  
Differentiation Index

Acadian granitic rocks in northern Cape Breton Island consist entirely of even-grained leucocratic granodiorite and adamellite. The compositional range is small, and the average composition corresponds well with melts that could be generated in the crust. Abundant pegmatites in the contact zone suggest high water content.Within the major plutons these granitic rocks show: (1) high scatter on a Rb–Sr isochron (Cormier 1972), (2) apparently random areal variation in K and Ca, but a systematic areal variation in K/Rb and Ca/Sr, and (3) high scatter of Na2O and K2O on plots against differentiation index. The minor compositional heterogeneity indicated by these relations could have originated within the source region of melting or by assimilation during emplacement.The granitic plutons are elongate north–south and occur in an en echelon pattern within a NNE-trending migmatite zone. The spatial arrangement of pre-emplacement structures in the country rock and the distribution of xenoliths in the intrusions suggest that emplacement was accommodated by east–west expansion, upbowing of the surrounding country rock, faulting, and minor stoping.

scholarly journals Geology, Northern Cape Breton Island, Nova Scotia

1992 ◽  
Author(s):  
S M Barr ◽  
R A Jamieson ◽  
R P Raeside
Keyword(s):  
Nova Scotia ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Northern Cape

AGE AND FORMATION OF ANORTHOSITIC ROCKS WITHIN THE BLAIR RIVER INLIER OF NORTHERN CAPE BRETON ISLAND, NOVA SCOTIA (CANADA)

2019 ◽  
Author(s):  
J. Gregory Shellnutt ◽  
◽  
Jaroslav Dostal ◽  
J. Duncan Keppie ◽  
D. Fraser Keppie
Keyword(s):  
Nova Scotia ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Northern Cape

Igneous and Tectonic Events in Northeastern Cape Breton Island, Nova Scotia

1972 ◽  
Vol 9 (10) ◽  
pp. 1262-1277 ◽  
Author(s):  
Robert A. Wiebe
Keyword(s):  
Subduction Zones ◽  
Coarse Grained ◽  
Island Arcs ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Igneous Activity ◽  
Northern Cape ◽  
History Of ◽  
George River ◽  
Metamorphic Unit

The geology of northern Cape Breton Island is characterized by two structurally and compositionally distinct metamorphic units and an extended history of igneous activity ranging in age from Precambrian to Devonian. The older metamorphic unit (George River Group(?)) is composed of metamorphosed psammitic and semipelitic rocks with some distinctive quartzite and coarse-grained marble layers. It was deformed and probably metamorphosed, prior to emplacement of Precambrian diorites. A younger metamorphic unit (Fourchu Group(?)) consists mostly of metamorphosed intermediate to acidic volcanic and volcaniclastic rocks and rests with angular unconformity on the George River Group (?) and the diorites. Shallow-level plutonic activity was contemporaneous with the Fourchu Group(?). Younger leucocratic granodiorites (410 m.y.) were emplaced at a depth of about 15 km and require deposition of a thick surficial sequence during the early Paleozoic (between 560 and 410 m.y.). Mississippian sedimentary rocks rest unconformably on all of the older rocks.Igneous rocks of the Precambrian are dominantly andesitic and are similar to present-day suites in island arcs associated with subduction zones. Their composition requires that they be generated in the mantle. The average compositions of igneous rocks emplaced from late Precambrian to Devonian time become more granitic and probably reflect increasing generation of magma from crustal sources.

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