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Consequences of maternal size for reproductive expenditure and pupping success of grey seals at North Rona, Scotland
The reproductive performance of individually marked mothers aged between 4 and 36 years breeding at the established grey seal colony of North Rona, Scotland was studied and general Linear Models and REML analyses indicated that expenditures were significantly different between mothers when other variables and factors had been taken into account. Expand
Microsatellite variation in grey seals (Halichoerus grypus) shows evidence of genetic differentiation between two British breeding colonies
Although grey seals are known to range over very large areas outside the breeding season, site fidelity of adults and philopatry of pups for these breeding colonies must be sufficiently common to have effects, through genetic drift, at the sub‐population level. Expand
Philopatry, Site Fidelity and Local Kin Associations within Grey Seal Breeding Colonies
Grey seals born and marked by tagging and cohort brands at colonies on North Rona, Outer Hebrides and at the Isle of May, Firth of Forth since 1981 have shown philopatry, suggesting the possibility of highly related groups within colonies. Expand
Where have all the fathers gone? An extensive microsatellite analysis of paternity in the grey seal (Halichoerus grypus)
It is concluded that aquatic mating may play a much larger role in the grey seal than has previously been thought. Expand
Individually distinctive pup vocalizations fail to prevent allo-suckling in grey seals
During the 1997 breeding season on the Isle of May, Scotland, vocalizations were recorded from grey seal, Halichoerus grypus, pups, and playback experiments revealed that mothers did not respond more to vocalizations of their own pups than to those of nonfilial pups. Expand
Finding fathers: spatio‐temporal analysis of paternity assignment in grey seals (Halichoerus grypus)
The authors found little evidence of unidentified male strategies at North Rona, Scotland, whereas further examination of mechanisms of female choice may be productive, and nearly all paternities assigned agreed with expectation based upon detailed knowledge of the spatio‐temporal patterns of individuals during the breeding season. Expand
Organochlorine levels in common seals (Phoca vitulina) which were victims and survivors of the 1988 phocine distemper epizootic.
High concentrations of organochlorines in the blubber of common seals found dead during the 1988 phocine distemper epizootic are compared with levels in animals which survived it, and between sample sites. Expand
Assessing use of and reaction to unmanned aerial systems in gray and harbor seals during breeding and molt in the UK
Wildlife biology applications of unmanned aerial systems (UAS) are extensive. Survey, identification, and measurement using UAS equipped with appropriate sensors can now be added to the suite ofExpand
Dispersion and site fidelity of breeding male grey seals (Halichoevus grypus) on North Rona, Scotland
The daily locations of socially active male grey seals were recorded during three successive breeding seasons on North Rona (Outer Hebrides, Scotland). Areas of occupancy were defined for 38Expand
Male mating success and paternity in the grey seal, Halichoerus grypus: a study using DNA fingerprinting
Overall, DNA typed males were more dominant, maintained positions amongst the females for longer, and accounted for disproportionately more paternities than untyped males, however, the reproductive success of the typed males is not as great as their behavioural domination of copulatory opportunities would suggest. Expand