scholarly journals The enigmatic whale: the North Atlantic humpback

2009 ◽  
Vol 7 ◽  
pp. 161 ◽  
Author(s):  
Tim D Smith ◽  
Daniel G Pike
Keyword(s):  
North Atlantic ◽  
Ocean Basin ◽  
Population Status ◽  
Considerable Uncertainty ◽  
The North ◽  
Breeding Populations ◽  
The Status ◽  
Breeding Grounds ◽  
The North Atlantic ◽  
Amount Of Knowledge

We know more about the North Atlantic humpback whale (Megaptera novaeangliae) than we do for virtually any other cetacean, yet attempts to use this information to describe the status of the populations in this ocean basin have not proven satisfactory. The North Atlantic humpback has been the subject of extensive research over the past few decades, resulting in a substantial amount of knowledge about what has proven to be a species with a very complex life history and population structure. While several population models have been developed to integrate the available information, the data overall are not well described by any of the models. This has left considerable uncertainty about population status, and has raised questions about the interpretation of some of the data. We describe 7 specific areas where puzzling or ambiguous observations have been made; these require closer attention if population status is to be determined. These areas raise several fundamental questions, including: How many breeding populations are there? How much do the populations mix on the feeding grounds? How has the distribution of animals on both feeding and breeding grounds changed? We identify additional research needed to address the 7 areas and these questions in particular, so that population status might be determined.

Monthly satellite-derived phytoplankton pigment distribution for the North Atlantic Ocean basin

Eos ◽  
1986 ◽  
Vol 67 (44) ◽  
pp. 835 ◽  
Author(s):  
W. E. Esaias ◽  
G. C. Feldman ◽  
C. R. McClain ◽  
J. A. Elrod
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Ocean Basin ◽  
Phytoplankton Pigment ◽  
The North ◽  
Pigment Distribution ◽  
The North Atlantic

Complement to the knowledge of the Haploops species (Crustacea, Gammaridea, Ampeliscidae), with the description of two new species from North Atlantic Ocean. [Contribution to the knowledge of the Haploops genus. 10.]

Zootaxa ◽  
2021 ◽  
Vol 5048 (2) ◽  
pp. 151-175
Author(s):  
R.A. KAIM-MALKA ◽  
D. BELLAN-SANTINI ◽  
J.C. DAUVIN
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Morphological Characters ◽  
Valid Species ◽  
Single Pair ◽  
The North ◽  
Two New Species ◽  
The Status ◽  
The North Atlantic

Two new Haploops species are described from the North Atlantic Ocean: a blind species Haploops faroensis spec. nov. and Haploops truncata spec. nov. with a single pair of corneal lenses. In addition, Haploops vallifera Stephensen 1925 and Haploops similis Stephensen 1925, are re-described and the status of Haploops spinosa Shoemaker 1931, is re-established as a valid species. A table is given of the 75 morphological characters of the studied species.  

Navigational Aspects of Turboprop Operation on the North Atlantic

1957 ◽  
Vol 10 (1) ◽  
pp. 31-49
Author(s):  
J. E. D. Williams
Keyword(s):  
Sixteenth Century ◽  
Long Range ◽  
North Atlantic ◽  
Fuel Load ◽  
The North ◽  
The Status ◽  
The North Atlantic ◽  
Aircraft Type

If navigation were confined to the function of keeping a craft on a desired track, and estimating its progress periodically, then a long-range turboprop would present no features of navigational interest. Navigation, however, is supposed to encompass a wider field than this. In a famous sixteenth-century definition, ‘Navigation demonstrateth how, by the shortest good way, by the aptest direction, and in the shortest time, a sufficient ship between any two places may be conducted’. The economic realities of modern airliner operation give a new emphasis to those phrases ‘By the shortest good way, by the aptest direction, and in the shortest time’. A Britannia 310, for example, which will be the first, probably the cheapest, and possibly the smallest, long-range turbineengined airliner, costs about £1 million and is capable of producing a gross revenue of £1000 per hour. The sum of payload and fuel load is limited in most long-range cases by maximum take-off weight, and the fuel for one hour of flight is equivalent in weight to about 2 5 passengers and their baggage. It is not surprising in the circumstances that quite minor refinements of navigational technique are worth tens of thousands of pounds per aircraft per year, while major improvements can alter the status of an aircraft type as an instrument of transport. Such aircraft should be considered as acutely sensitive instruments to be operated precisely according to scientifically designed techniques.

A link between male sperm whales, Physeter macrocephalus, of the Azores and Norway

2012 ◽  
Vol 92 (8) ◽  
pp. 1751-1756 ◽  
Author(s):  
Lisa Steiner ◽  
Luca Lamoni ◽  
Marta Acosta Plata ◽  
Silje-Kristin Jensen ◽  
Erland Lettevall ◽  
...  
Keyword(s):  
Nova Scotia ◽  
North Atlantic ◽  
Ocean Basin ◽  
Physeter Macrocephalus ◽  
Sperm Whales ◽  
Photo Identification ◽  
The North ◽  
Male Sperm ◽  
Basin Scale ◽  
The North Atlantic

Little is known about the movements of male sperm whales, Physeter macrocephalus, in the North Atlantic. Recoveries of traditional harpoons and tags during commercial whaling indicated movements from Nova Scotia to Spain and from the Azores to Iceland and Spain. We compared collections of photo-identification images from different areas using the North Atlantic and Mediterranean Sperm Whale Catalogue and the Eurphlukes Phlex/Match programs. The largest collections of identified males (number of individuals, start and end date for data collection shown in parentheses) are for the Azores (297, 1987–2008), Andenes (375, 1988–1996 and 2008), Tromsø (84, 2005–2008). There were six matches between Andenes and Tromsø (~25 nm), with three of these re-sighted in multiple years and three photo-identification matches from the Azores to Norway (~2400 nm). In all cases individuals first photographed in the Azores (in 1993, 1999 and 2003) were matched to images collected later in Tromsø (in 2007 and 2008). In 1997 a photo-identification image from Andenes matched a male stranded on the west coast of Ireland. No matches were made to images in smaller collections from Iceland, Nova Scotia, Greenland, Dominica, Guadeloupe, Gulf of Mexico and the Mediterranean. These findings show the value of data collected from whale watching vessels and the importance of collaboration between groups to allow investigation on an ocean basin scale. It is hoped that with the coordinated collection of more images from around the Atlantic, further insight might be gained into the movements of these widely ranging animals.

scholarly journals From pup production to quotas: current status of harp seals in the Greenland Sea

2013 ◽  
Vol 71 (3) ◽  
pp. 537-545 ◽  
Author(s):  
Tor Arne Øigård ◽  
Tore Haug ◽  
Kjell Tormod Nilssen
Keyword(s):  
Population Size ◽  
North Atlantic ◽  
Population Model ◽  
Current Status ◽  
Total Abundance ◽  
The North ◽  
Production Estimate ◽  
Pagophilus Groenlandicus ◽  
The Status ◽  
The North Atlantic

Abstract Harp seals (Pagophilus groenlandicus) have been harvested for centuries in the North Atlantic. Estimating abundance and monitoring changes in population size are critical for the management of the species. In March 2012, the harp seal pup production was estimated from aerial photographic surveys over the whelping areas. A total area of 305 km2 was photographed and 6034 pups were counted on the photos. From this the total pup production estimate was 89 590 ( s.e. = 12 310, CV = 13.7%). The status of the stock was subsequently assessed by fitting a population model to the independent pup production estimate, the historical catch data, and the historical reproduction data. The 2013 total abundance (including pups) was estimated to be 627 410 (95% CI = 470 540–784 280) harp seals. We demonstrate how the model is used in assessment when exploring the effect of various catch scenarios on future predictions.

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