The population structure of the harbour porpoise, Phocoena phocoena, in Danish waters and part of the North Atlantic

1993 ◽  
Vol 116 (1) ◽  
pp. 1-7 ◽  
Author(s):  
L. W. Andersen
Keyword(s):  
Population Structure ◽  
North Atlantic ◽  
Harbour Porpoise ◽  
Phocoena Phocoena ◽  
The North ◽  
The North Atlantic

scholarly journals A review of methods for defining population structure in the harbour porpoise (Phocoena phocoena)

2003 ◽  
Vol 5 ◽  
pp. 41 ◽  
Author(s):  
Christina Lockyer
Keyword(s):  
Population Structure ◽  
North Atlantic ◽  
Ecological Factors ◽  
Harbour Porpoise ◽  
The North ◽  
Contaminant Loads ◽  
Management Measures ◽  
The North Sea ◽  
The North Atlantic ◽  
The Baltic

Wide-ranging methods that have been used to determine population structure, including distribution, life history, biology, ecological factors such as diet and contaminant loads, morphology and genetics, are reviewed. The importance of determining population sub-structure of harbour porpoise throughout the North Atlantic, especially in regions affected by incidental take in fisheries, is discussed in relation to management measures. Some practical proposals are made for integrating diverse information about populations, using the phylogeographic approach, for thepurpose of evaluating the need to manage putative subpopulations separately. Examples focusingon the North and Baltic seas areas are used in this discussion, with some reference to other areas. It is concluded that the existing IWC proposal for 13 populations in the North Atlantic is generally supported, but with some refinement and modification; in particular, allowing sub-divisions in the area through the North Sea to the Baltic.

scholarly journals Harbour porpoises (Phocoena phocoena) in the North Atlantic: Distribution and genetic population structure

2003 ◽  
Vol 5 ◽  
pp. 11 ◽  
Author(s):  
Liselotte Wesley Andersen
Keyword(s):  
Population Structure ◽  
Genetic Structure ◽  
North Atlantic ◽  
Nuclear Dna ◽  
Harbour Porpoise ◽  
Genetic Population ◽  
The North ◽  
Comprehensive Picture ◽  
Mitochondria Dna ◽  
The North Atlantic

The known geographical distribution (based on ship surveys, aerial surveys, incidental sightings, stranding and bycatch data) and the population genetic structure obtained from mitochondria DNA and nuclear DNA (isozymes and microsatellites) data analyses of the harbour porpoise in the North Atlantic have recently been reviewed and revised by the International Whaling Commission. The present review builds on these documents by integrating more recent genetic and distributional studies. Studies of the genetic structure of harbour porpoise populations tend to be concentrated in areas where samples are available which coincide with areas where incidental or directed catches or stranding take place. Nevertheless, recently, several genetic studies on the population structure have been able to reveal a more comprehensive picture of the harbour porpoise population structure in the Northwest and Northeast Atlantic, although not all areas have been subjected to analyses.

scholarly journals Harbour porpoise (Phocoena phocoena) in the North Atlantic: Abundance, removals, and sustainability of removals

2003 ◽  
Vol 5 ◽  
pp. 271 ◽  
Author(s):  
G B Stenson
Keyword(s):  
North Atlantic ◽  
Harbour Porpoise ◽  
Phocoena Phocoena ◽  
The North ◽  
Number Of Factors ◽  
The Status ◽  
Substantial Progress ◽  
Potential Population ◽  
The North Atlantic ◽  
The Impact

The status of harbour porpoise (Phocoena phocoena) populations in the North Atlantic has raised numerous concerns. Although a number of factors that may be adversely affecting harbour porpoise populations have been identified, focus has been on the impact of removals, primarily due to incidental catches in fishing gear. As a result, considerable efforts have been made to determine the levels and/or impact of bycatch in a number of areas. Unfortunately, many areas remain little studied. Currently, harbour porpoise are listed as threatened or vulnerable in many parts of their range. In order to determine if the current levels of removals are sustainable, information on stock identity and seasonal movements, population parameters, abundance, and the magnitude of removals is required. Although substantial progress has been made to improve our knowledge of these parameters in the last decade, significant gaps still exist. After reviewing the available data for each sub-population in the North Atlantic, it is clear that the information required to assess the status of harbour porpoise populations is still not available for most areas. Attempts have been made to assess the status of harbour porpoise based on trends in sightings or, in areas where information on abundance and bycatch are available, on models using arbitrary criteria and/or theoretical estimates of potential population growth. Detailed case-specific population models have been proposed but are not yet available.

Asymmetry in the skull of the harbour porpoise Phocoena phocoena (L.) and its relationship to sound production and echolocation

1988 ◽  
Vol 66 (2) ◽  
pp. 399-402 ◽  
Author(s):  
D. B. Yurick ◽  
D. E. Gaskin
Keyword(s):  
North Atlantic ◽  
North Pacific ◽  
Sound Production ◽  
East Coast ◽  
Harbour Porpoise ◽  
Phocoena Phocoena ◽  
The North ◽  
The North Atlantic ◽  
The North Pacific ◽  
Precocious Development

Cranial asymmetry in the harbour porpoise Phocoena phocoena (L.) was studied using a series of 115 skulls obtained from animals from both sides of the North Atlantic and the east coast of the North Pacific. The degree of sinistrad asymmetry or "skew" did not differ significantly between these three populations. Contrary to an earlier report in the literature, skew was not found to be correlated with skull length or, by implication, age. This result is in accord with the necessity for precocious development of the nasal sac complex and associated structures in this species, which inhabits an environment in which the aural and acoustic faculties are of paramount importance.

scholarly journals Genetic structuring in Atlantic haddock contrasts with current management regimes

2020 ◽  
Author(s):  
Paul R Berg ◽  
Per E Jorde ◽  
Kevin A Glover ◽  
Geir Dahle ◽  
John B Taggart ◽  
...  
Keyword(s):  
Population Structure ◽  
North Atlantic ◽  
Isolation By Distance ◽  
Melanogrammus Aeglefinus ◽  
Genetic Structuring ◽  
Current Management ◽  
Northeast Atlantic ◽  
The North ◽  
Management Regime ◽  
The North Atlantic

Abstract The advent of novel genetic methods has made it possible to investigate population structure and connectivity in mobile marine fish species: knowledge of which is essential to ensure a sustainable fishery. Haddock (Melanogrammus aeglefinus) is a highly exploited marine teleost distributed along the coast and continental shelf on both sides of the North Atlantic Ocean. However, little is known about its population structure. Here, we present the first study using single-nucleotide polymorphism (SNP) markers to assess the genetic population structure of haddock at multiple geographic scales, from the trans-Atlantic to the local (fjord) level. Genotyping 138 SNP loci in 1329 individuals from 19 locations across the North Atlantic revealed three main genetic clusters, consisting of a Northwest Atlantic cluster, a Northeast Arctic cluster, and a Northeast Atlantic cluster. We also observed a genetically distinct fjord population and a pattern of isolation by distance in the Northeast Atlantic. Our results contrast with the current management regime for this species in the Northeast Atlantic, as we found structure within some management areas. The study adds to the growing recognition of population structuring in marine organisms in general, and fishes in particular, and is of clear relevance for the management of haddock in the Northeast Atlantic.

The Biology of the Deep-Sea Species of Mysidacea (Crustacea) of the Rockall Trough

1986 ◽  
Vol 66 (4) ◽  
pp. 803-824 ◽  
Author(s):  
J. Mauchline
Keyword(s):  
Population Structure ◽  
Water Column ◽  
Geographical Distribution ◽  
North Atlantic ◽  
Deep Sea ◽  
Depth Range ◽  
The North ◽  
Pelagic Environment ◽  
Rockall Trough ◽  
The North Atlantic

The mysid fauna of the Rockall Trough consists of more than 35 species partitioned between the pelagic water column and the bentho-pelagic environment. The pelagic mysids are dominated by Eucopia grimaldii, E. unguiculata and Boreomysis microps. The benthopelagic mysids, in a transect from 400 to 2900 m depth, are divided into four faunal associations. Pseudomma affine dominates the 400–800 m depth range; the impinging bathypelagic Gnathophausia zoea and the benthopelagic Boreomysis widens dominate the 800–1300 m range;Michthyops parva and Paramblyops rostrata are co-dominants in the 1400–2300 m range; while Amblyopsoides ohlinii dominates the 2170–2965 m range. The benthopelagic mysid fauna is most diverse at depths below 1400 m. It is dominated by species whose geographical distribution is restricted to the North Atlantic, in contrast to the pelagic mysid fauna, which is dominated by cosmopolitan species. Notes on the breeding season, biology and population structure of several species are given.

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