Prey switching by killer whales in the north-east Atlantic: observational evidence and experimental insights

2013 ◽  
Vol 94 (6) ◽  
pp. 1357-1365 ◽  
Author(s):  
Dag Vongraven ◽  
Anna Bisther
Keyword(s):  
Killer Whale ◽  
Large Population ◽  
Tooth Wear ◽  
Killer Whales ◽  
Prey Switching ◽  
Photo Identification ◽  
North East ◽  
The North ◽  
Spawning Stock

Studies in the Pacific have identified distinct killer whale ecotypes that are either specialized mammal- or fish-eaters. The different types have developed hunting strategies that would suggest specialization could be more advantageous than generalism. However, it has been suggested, based on long-term dietary markers of tooth wear and stable isotope values, that lineages in the North Atlantic are generalist, but with individual variation in the proportion of prey types consumed. Here, we present the results of ten years of observational and photo-identification data of a population of killer whales that follows the Norwegian spring-spawning stock of Atlantic herring. Although the whales were predominantly observed while feeding upon herring, one pod of herring-eating whales was also observed interacting with seals. This supports the hypothesis based on the long-term markers, of a degree of specialization, with a small number of groups persistently feeding upon mammals, but switching between herring and seals. We further investigated this prey switching by conducting playbacks of herring-eating killer whale sounds to harbour seals at haul-out sites on the herring spawning grounds. We recorded changes in behaviour consistent with an anti-predator response, suggesting the seals perceived the herring-eating killer whales as a potential predatory threat and had not habituated to their calls. This could be due to the risk of herring-eating killer whales switching to mammalian prey, or the difficulty of discriminating between killer whale pods due to the large population size and number of killer whale call dialects in this population, or a combination of both.

In memory of Vera Antonovna Martynenko (1936-2018)

2018 ◽  
pp. 149-154
Keyword(s):  
Vascular Plants ◽  
Ussr Academy ◽  
Vascular Plant ◽  
Plant Cover ◽  
Komi Republic ◽  
Great Contribution ◽  
North East ◽  
The North ◽  
Natural Flora

Vera Antonovna Martynenko (17.02.1936–06.01.2018) — famous specialist in the field of studying vascular plant flora and vegetation of the Far North, the Honored worker of the Komi Republic (2006), The Komi Republic State Scientific Award winner (2000). She was born in the town Likhoslavl of the Kali­nin (Tver) region. In 1959, Vera Antonovna graduated from the faculty of soil and biology of the Leningrad State University and then moved to the Komi Branch of USSR Academy of Science (Syktyvkar). From 1969 to 1973 she passed correspondence postgraduate courses of the Komi Branch of USSR Academy of ­Science. In 1974, she received the degree of candidate of biology (PhD) by the theme «Comparative analysis of the boreal flora at the Northeast European USSR» in the Botanical Institute (St. Petersburg). In 1996, Vera Antonovna received the degree of doctor of biology in the Institute of plant and animal ecology (Ekaterinburg) «Flora of the northern and mid subzones of the taiga of the European North-East». The study and conservation of species and coenotical diversity of the plant world, namely the vascular plants flora of the Komi Republic and revealing its transformation under the anthropogenic influence, was in the field of V. A. Martynenko’ scientific interests. She made great contribution to the study of the Komi Republic meadow flora and the pool of medi­cinal plants. She performed inventorying and mapping the meadows of several agricultural enterprises of the Republic, revealed the species composition and places for harvesting medicinal plants and studied their productivity in the natural flora of the boreal zone. The results of her long-term studies were used for making the NPA system and the Red Book of the Komi Republic (1998 and 2009). Vera Antonovna participated in the research of the influence of placer gold mining and oil development on the natural ecosystems of the North, and developed the method of long-term monitoring of plant cover. Results of these works are of high practical value. V. A. Martynenko is an author and coauthor of more than 130 scientific publications. The most important jnes are «Flora of Northeast European USSR» (1974, 1976, and 1977), «Floristic composition of fodder lands of the Northeast Europe» (1989), «The forests of the Komi Republic» (1999), «Forestry of forest resources of the Komi Republic» (2000), «The list of flora of the Yugyd va national park» (2003), «The guide for vascular plants of the Syktyvkar and its vicinities» (2005), «Vascular plants of the Komi Republic» (2008), and «Resources of the natural flora of the Komi Republic» (2014). She also was an author of «Encyclopedia of the Komi Republic» (1997, 1999, and 2000), «Historical and cultural atlas of the Komi Republic» (1997), «Atlas of the Komi Republic» (2001, 2011). V. A. Martynenko made a great contribution to the development of the botanical investigations in the North. Since 1982, during more than 10 years, she was the head of the Department of the Institute of Biology. Three Ph. D. theses have been completed under her leadership. Many years, she worked actively in the Dissertation Council of the Institute of biology Komi Scientific Centre UrB RAS.  The death of Vera Antonovna Martynenko is a heavy and irretrievable loss for the staff of the Institute of Biology. The memory of Vera Antonovna will live in her numerous scientific works, the hearts of students and colleagues.

scholarly journals Family feud: permanent group splitting in a highly philopatric mammal, the killer whale (Orcinus orca)

2021 ◽  
Vol 75 (3) ◽  
Author(s):  
Eva H. Stredulinsky ◽  
Chris T. Darimont ◽  
Lance Barrett-Lennard ◽  
Graeme M. Ellis ◽  
John K. B. Ford
Keyword(s):  
Killer Whale ◽  
Group Structure ◽  
Group Living ◽  
Orcinus Orca ◽  
Learning Approaches ◽  
Killer Whales ◽  
Internal Factors ◽  
Individual Fitness ◽  
Leadership Experience

Abstract For animals that tend to remain with their natal group rather than individually disperse, group sizes may become too large to benefit individual fitness. In such cases, group splitting (or fission) allows philopatric animals to form more optimal group sizes without sacrificing all familiar social relationships. Although permanent group splitting is observed in many mammals, it occurs relatively infrequently. Here, we use combined generalized modeling and machine learning approaches to provide a comprehensive examination of group splitting in a population of killer whales (Orcinus orca) that occurred over three decades. Fission occurred both along and across maternal lines, where animals dispersed in parallel with their closest maternal kin. Group splitting was more common: (1) in larger natal groups, (2) when the common maternal ancestor was no longer alive, and (3) among groups with greater substructuring. The death of a matriarch did not appear to immediately trigger splitting. Our data suggest intragroup competition for food, leadership experience and kinship are important factors that influence group splitting in this population. Our approach provides a foundation for future studies to examine the dynamics and consequences of matrilineal fission in killer whales and other taxa. Significance statement Group living among mammals often involves long-term social affiliation, strengthened by kinship and cooperative behaviours. As such, changes in group membership may have significant consequences for individuals’ fitness and a population’s genetic structure. Permanent group splitting is a complex and relatively rare phenomenon that has yet to be examined in detail in killer whales. In the context of a growing population, in which offspring of both sexes remain with their mothers for life, we provide the first in-depth examination of group splitting in killer whales, where splitting occurs both along and across maternal lines. We also undertake the first comprehensive assessment of how killer whale intragroup cohesion is influenced by both external and internal factors, including group structure, population and group demography, and resource abundance.

scholarly journals “The way things get done around here…” Exploring spatial biographies, social policy and governance in the North East of England

2017 ◽  
Vol 37 (11-12) ◽  
pp. 655-666 ◽  
Author(s):  
Jon Warren
Keyword(s):  
Social Policy ◽  
Empirical Work ◽  
Social Progress ◽  
Local Conditions ◽  
Content Type ◽  
North East ◽  
The North ◽  
Policy Interventions ◽  
Health Related

Purpose The purpose of this paper is to argue that the application of social policy in the North East of England is often characterised by tension and conflict. The agencies and professionals charged with implementation of Westminster driven policies constantly seek to deploy their knowledge of local conditions in order to make them both practical and palatable. Design/methodology/approach This paper examines the region via established literature from history, geography, sociology and social policy. The paper gives illustrations via empirical work which has evaluated initiatives to improve the health of long term health-related benefit recipients and to sustain individuals in employment in the region. Findings Central to the paper’s argument is the notion of “biographies of place”. The core of this idea is that places have biographies in the same way as individuals and possess specific identities. These biographies have been shaped by the intersections between environment, history, culture and economic and social policy. The paper identifies the region’s economic development, subsequent decline and the alliance of labour politics and industrial employers around a common consensus that sought economic prosperity and social progress via a vision of “modernisation” as a key component of this biography. Originality/value The paper argues that an appreciation of these spatial biographies can result in innovative and more effective social policy interventions with the potential to address issues that affect entire localities.

Northeast India

2019 ◽  
pp. 156-167
Author(s):  
Kaholi Zhimomi
Keyword(s):  
Identity Politics ◽  
Regional Identity ◽  
Northeast India ◽  
Way Of Life ◽  
North East ◽  
The North ◽  
Indigenous Groups ◽  
The Social ◽  
Military Violence

The north-east has a distinct regional identity, as the land of seven sisters, Assam, Arunachal Pradesh, Meghalaya, Manipur, Mizoram, Nagaland, Tripura and Sikkim; and yet, has been absorbed into the social, cultural and political scheme of the secular nation since independence. The identity politics resulted in dissatisfaction on the part of the indigenous people, which generated long-term military violence in Northeast India. Today, disempowerment among indigenous groups is enormous. For early missionaries, conversion to Christianity also entailed adoption of the Western way of life. Most of the missionaries in Northeast India were American or Welsh among the Protestants and German, Spanish or Italian among the Catholics. Despite exploitation by colonialists that attempted to replace indigenous customs, revivals paved the way for renaissance for those customs. Today, Christianity is the major religion in the states of Nagaland, Mizoram and Meghalaya, with significant growth of indigenous leaders, both secular and religious. Furthermore, there is a rapid growth of educated young tribals who are qualified administrators, educators, academicians, politicians and theologians. With the effects of globalization and modernisation, Christianity must not be assumed to be an agent of acculturation but an agent that helped in the metamorphosis of indigenous norms into authentic tradition.

scholarly journals Middle/late Miocene hoplocetine sperm whale remains (Odontoceti: Physeteridae) of North Germany with an emended classification of the Hoplocetinae

Fossil Record ◽  
2006 ◽  
Vol 9 (1) ◽  
pp. 61-86 ◽  
Author(s):  
O. Hampe
Keyword(s):  
Late Miocene ◽  
Killer Whale ◽  
Sperm Whale ◽  
Tooth Wear ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Functional Tooth ◽  
North Germany ◽  
Middle Pliocene

Abstract. Hoplocetus ritzi n. sp. is a new hoplocetine physeterid from the Bolboforma fragori /subfragoris Zone of the middle/late Miocene mica-clay of Groß Pampau in Schleswig-Holstein, North Germany. The Hoplocetinae are known from the early Miocene to the Pliocene. Comparative studies of cranial characters and tooth morphology allow an emended diagnosis of the Hoplocetinae Cabrera, 1926. Four genera, Diaphorocetus, Idiorophus, Scaldicetus, and Hoplocetus are included in this subfamily. The pattern of functional tooth wear deduced from the described Hoplocetus ritzi n. sp. remains is reminescent of that known from Orcinus orca. The hoplocetine physeterids possibly occupied the killer whale niche before the killer whales appeared during the middle Pliocene. Mit Hoplocetusritzi n. sp. wird ein neuer hoplocetiner Physeteride beschrieben. Der Fund stammt aus der Bolboformafragori /subfragoris Zone des mittel-/obermiozänen Glimmertons von Groß Pampau in Schleswig-Holstein, Norddeutschland. Die Hoplocetinae sind vom unteren Miozän bis ins Pliozän nachgewiesen. Anhand vergleichender Untersuchungen an wenigen Schädelmerkmalen und der Zahnmorphologie gelingt eine Neudiagnose der Hoplocetinae Cabrera, 1926 und eine vorläufige Abgrenzung zwischen den als valid angesehenen Gattungen dieser Unterfamilie, Diaphorocetus, Idiorophus, Scaldicetus und Hoplocetus. Das Abkauungsmuster der Zähne von Hoplocetusritzi n. sp. erinnert an das des heutigen Orcinusorca. Möglicherweise sind die hoplocetinen Pottwale habituell den Schwertwalen, die erdgeschichtlich erstmals im mittleren Pliozän auftreten, vergleichbar. doi:10.1002/mmng.200600002

Long-Term Costs of Stroke Using 10-Year Longitudinal Data From the North East Melbourne Stroke Incidence Study

Stroke ◽  
2014 ◽  
Vol 45 (11) ◽  
pp. 3389-3394 ◽  
Author(s):  
Tristan D. Gloede ◽  
Sarah M. Halbach ◽  
Amanda G. Thrift ◽  
Helen M. Dewey ◽  
Holger Pfaff ◽  
...  
Keyword(s):  
Longitudinal Data ◽  
Incidence Study ◽  
Stroke Incidence ◽  
North East ◽  
The North

Preliminary findings of restriction fragment differences in mitochondrial DNA among killer whales (Orcinus orca)

1989 ◽  
Vol 67 (10) ◽  
pp. 2592-2595 ◽  
Author(s):  
Tracy A. Stevens ◽  
Deborah A. Duffield ◽  
Edward D. Asper ◽  
K. Gilbey Hewlett ◽  
Al Bolz ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
North Atlantic ◽  
North Pacific ◽  
Killer Whale ◽  
Vancouver Island ◽  
Restriction Pattern ◽  
Orcinus Orca ◽  
Killer Whales ◽  
The North ◽  
The North Pacific

A preliminary assessment of mitochondrial DNA restriction patterns in the killer whale (Orcinus orca) was conducted using 10 captive North Atlantic killer whales from the southeastern coast of Iceland, a captive-born offspring of one of these whales, and 9 North Pacific killer whales. No restriction pattern variation was seen among these whales, using the enzymes BamH I, Bgl II, Hinf I, Kpn I, or Pvu II. Restriction pattern variation was found using the enzyme Hae III. This restriction endonuclease distinguished the North Atlantic killer whales (type 1) from the North Pacific killer whales. The North Pacific killer whales were further differentiated into two groups: those originating from the "resident" communities of the Vancouver Island region (type 2), and those from the "transient" community of Vancouver Island, as well as those stranded along the Oregon coast (type 3). The observed Hae III restriction pattern differences suggest that mitochondrial DNA analysis will be a valuable technique for investigating regional and local distributions of maternal lineages among killer whale pods, especially in the North Pacific.

scholarly journals Shifting the Goalposts: A Longitudinal Mixed-Methods Study of the Health of Long-Term Incapacity Benefit Recipients during a Period of Substantial Change to the UK Social Security System

2014 ◽  
Vol 43 (2) ◽  
pp. 311-330 ◽  
Author(s):  
KAYLEIGH GARTHWAITE ◽  
CLARE BAMBRA ◽  
JONATHAN WARREN ◽  
ADETAYO KASIM ◽  
GRAEME GREIG
Keyword(s):  
Mixed Methods ◽  
Social Security ◽  
Safety Net ◽  
Health State ◽  
Disabled People ◽  
Welfare Benefits ◽  
North East ◽  
The North ◽  
The Uk

AbstractThe UK social security safety net for those who are out of work due to ill health or disability has experienced significant change, most notably the abolition of Incapacity Benefit (IB) and the introduction of Employment and Support Allowance (ESA). These changes have been underpinned by the assumption that many recipients are not sufficiently sick or disabled to ‘deserve’ welfare benefits – claims that have been made in the absence of empirical data on the health of recipients. Employing a unique longitudinal and mixed-methods approach, this paper explores the health of a cohort of 229 long-term IB recipients in the North East of England over an eighteen-month period, during a time of significant changes to the UK welfare state. In-depth interviews with twenty-five of the survey cohort are also presented to illustrate the lived experiences of recipients. Contributing to debates surrounding the conceptualisation of work-readiness for sick and disabled people, findings indicate IB recipients had significantly worse health than the general population, with little change in their health state over the eighteen-month study period. Qualitative data reinforced the constancy of ill health for IB recipients. Finally, the paper discusses the implications for social policy, noting how the changing nature of administrative definitions and redefinitions of illness and capacity to work can impact upon the lives of sick and disabled people.

Sign in / Sign up

Export Citation Format

Share Document