Distribution and habitat partitioning by small odontocetes in the Gully, a submarine canyon on the Scotian Shelf

  title={Distribution and habitat partitioning by small odontocetes in the Gully, a submarine canyon on the Scotian Shelf},
  author={Shannon Gowans and H. Whitehead},
  journal={Canadian Journal of Zoology},
In this paper we examine the summer distribution of three species of small odontocetes in the highly productive waters in and near the Gully, a submarine canyon on the edge of the Scotian Shelf. Atlantic white-sided dolphins (Lagenorhynchus acutus) and common dolphins (Delphinus delphis) were not randomly distributed with respect to depth, sea-floor relief, month of sighting, or sea-surface temperature. Long-finned pilot whales (Globicephala melas) were not randomly distributed with respect to… Expand

Figures and Tables from this paper

Temporal Variability of Cetaceans near Halifax, Nova Scotia
Increased numbers of White-sided Dolphins, Fin and Humpback whales in 1997 may be explained by increased prey abundance and decreased sea-surface temperatures. Expand
Ecology, status and conservation of short-beaked common dolphins Delphinus delphis in the Mediterranean Sea
Current knowledge is reviewed and priorities for action aimed at identi- fying and mitigating the main threats to common dolphins in the Mediterranean are suggested, with the ultimate goal of restoring the species' favourable conservation status in the region. Expand
Marine Protected Area Design and the Spatial and Temporal Distribution of Cetaceans in a Submarine Canyon
Abstract: The Gully, the largest submarine canyon off the coast of eastern Canada, is currently under consideration as a marine conservation area, primarily because of the increasing interest in oilExpand
Habitat partitioning mediates the coexistence of sympatric dolphins in a tropical fjord-like embayment
It is argued that the coexistence of both predators in Golfo Dulce is linked to habitat heterogeneity, where critical habitats are spatially differentiated, and highlights a process of coexistence for dolphins that are sympatric at the scale of Golfe Dulce, but within the Gulf there is fine-scale allopatry. Expand
Fine-scale habitat selection by white-beaked and common dolphins in the Minch (Scotland, UK): evidence for interspecific competition or coexistence?
There are subtle differences in habitat selection and diet between these two species, which may enable L. albirostris and D. delphis to coexist in the Minch and result in niche partitioning arising from previous/ongoing interspecific competition. Expand
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012
The results showed depth had a significant influence on presence of the short-finned pilot whale, which preferred waters deeper than 1 800 m, whereas slope of the ocean floor had a positive effect but was not significant. Expand
Habitat selection in a coastal dolphin species (Cephalorhynchus hectori)
Hector's dolphin habitat was quantified by recording the abiotic factors sea surface temperature (SST), water depth and water clarity, and the preference of Hector's dolphins for warm and turbid waters was tested using eight models. Expand
Trends in cetacean abundance in the Gully submarine canyon, 1988-2011, highlight a 21% per year increase in Sowerby's beaked whales (Mesoplodon bidens)
Long time series of abundance data have advanced ecological understanding. I examined trends in incidental sightings of cetaceans in the Gully and neighbouring submarine canyons on the edge of theExpand
Behavior of free-ranging common dolphins (Delphinus sp.) in the Hauraki Gulf, New Zealand
Foraging behavior was prevalent in both small and large group sizes, suggesting foraging plasticity exists within this population, and a correlation between group size and behavior was evident, although behavior did not vary with the composition of dolphin groups. Expand
Oceanographic Determinants of the Abundance of Common Dolphins (Delphinus delphis) in the South of Portugal
Findings corroborate previous findings that common dolphins tend to occur in highly productive areas demonstrating linkages between their abundance and oceanographic variables, and that this region may be a potential nursery ground. Expand


The distribution of white-sided (Lagenorhynchus acutus) and common dolphins (Delphinus delphis) vs. environmental features of the continental shelf of the northeastern United States
Although both species of dolphins were sighted more frequently in areas of high sea floor relief, white-sided dolphins occurred in areas where sea surface temperatures and salinities are low while common dolphins were Sighted in warmer, more saline waters. Expand
Seasonal changes in distribution and habitat differences among dolphins in the eastern tropical Pacific
Large-scale patterns of dolphin distribution and oceanography were studied from research-vessel surveys conducted in the pelagic eastern tropical Pacific dunng June to November 1982, 1986 and 1987.Expand
Seasonal distribution and density of common dolphins Delphinus delphis off the south-east coast of southern Africa
Common dolphins have probably adapted to the plentiful food resources provided by the sardine run, and females may use the migration to wean their young and replenish energy reserves before their next pregnancy. Expand
Distribution of Delphinidae (Cetacea) in relation to sea surface temperatures off Eastern and Southern New Zealand
Summary Records of four species of Delphinidae, Delphinus delphis, Lissodelphis peroni, Lagenorhynchus obscurus, and Lagenorhynchus cruciger in waters to the east and south‐east of New Zealand areExpand
Modified Leslie–DeLury Population Models of the Long-Finned Pilot Whale (Globicephala melaena) and Annual Production of the Short-Finned Squid (Illex illecebrosus) Based upon their Interaction at Newfoundland
Closed system models are generated to estimate the initial population size of the exploited pilot whales at less than 60,000 and squid landings as a correction for availability of whales at more than 100,000. Expand
Distribution and behaviour of male sperm whales on the Scotian Shelf, Canada
Studies of mature male sperm whales on the Scotian Shelf during the summers of 1986, 1988, 1989, and 1990 showed little evidence of social organization and rarely performed aerial behaviour, but their diving behaviour was similar to that observed from female sperm whales in the tropics. Expand
Associations between seabirds and cetaceans: a review
Seabird-cetacean associations involve many genera and it is not possible to say which derives benefit from the association, but on theoretical grounds it is most likely to be the seabird. Expand
Observations on Distribution and Intraspecific Variation in Pigmentation Patterns of Odontocete Cetacea in the Western North Atlantic
Of interest are the first western Atlantic extralimital record of Monodon monoceros, first Newfoundland records of Stenella coeruleoalba, and extralIMital records of Delphinapterus leucas from Newfoundland. Expand
Inshore Records of Cetacea for Eastern Canada, 1949–68
New and previously published records are given for 19 species of Cetacea stranded naturally, netted, or shot on the coasts of eastern Canada from Cape Chidley, Labrador (60°30′N), to the UnitedExpand
Variations in the feeding success and behaviour of Galápagos sperm whales (Physeter macrocephalus) as they relate to oceanographie conditions
Variations in the feeding success and behaviour ofGalapagos sperm whales can likely be attributed to changing oceanographic conditions in the waters surrounding the Galapagos archipelago. Expand