Nonrandom association patterns at northern long-eared bat maternity roosts

2007 ◽  
Vol 85 (9) ◽  
pp. 956-964 ◽  
Author(s):  
Colin J. Garroway ◽  
Hugh G. Broders
Keyword(s):  
Social Structure ◽  
Analytical Techniques ◽  
Lactation Period ◽  
Association Rate ◽  
Association Index ◽  
The Social ◽  
Temporal Persistence ◽  
Best Fit ◽  
Behavioural Evidence

Bats are among the most ecologically diverse mammalian orders. Most species live in groups for at least a portion of their life cycle and behavioural evidence suggests that individuals of many species live within complex nonrandomly assorting societies. However, rigorous quantitative characterizations of bat societies have been rare because of the difficulties inherent in studying these highly mobile, small, nocturnal animals. Here we use an automated monitoring system (PIT tags), telemetry, and recently developed analytical techniques to investigate the social organization (size, sexual composition, and spatiotemporal cohesion) and social structure (pattern of social interactions and relationships among individuals) of a colony of free-living northern long-eared bats, Myotis septentrionalis (Trouessart, 1897). Cluster analysis of HWI (half-weight association index) for all pairs and permutation tests indicate that colonies consist of multiple, nonrandomly assorting subgroups. A plot of the temporal persistence of relationships (standardized lagged association rate) showed that roosting groups dissociate over periods of approximately 10 days after which subsets of individuals remain associated throughout the summer roosting season. A model representing a two-levelled social structure of long-term (whole summer) and short-term (up to 10 days) acquaintances best fit the lagged association rate. Subgroups were most cohesive during the lactation period, but we found no evidence for the effects of minimum nightly temperature on subgroup cohesion.

Behavioural evidence for social units in long-finned pilot whales

2003 ◽  
Vol 81 (8) ◽  
pp. 1327-1338 ◽  
Author(s):  
C Andrea Ottensmeyer ◽  
Hal Whitehead
Keyword(s):  
Permutation Testing ◽  
Mammal Species ◽  
Genetic Sampling ◽  
The Social ◽  
Fishery Data ◽  
Pilot Whales ◽  
Social Units ◽  
Best Fit ◽  
Behavioural Evidence

In general, mammal species show geographic or social dispersal by one or both sexes. Long-term behavioural observations and genetic evidence have confirmed that fish-eating resident killer whales, Orcinus orca, are a rare exception. Female and male offspring travel with their mothers for their whole lives: this is natal group philopatry. It is suspected that pilot whales, Globicephala spp., also follow this social pattern, but longitudinal data on the social structure of live long-finned pilot whales, Globicephala melas, are rare. We observed G. melas through July and August of 1998–2000 off northern Nova Scotia, Canada. Estimated group sizes ranged from 2 to 135 (mean = 20, SD = 17, median = 15, n = 249). We distinguished 322 individuals on the basis of distinctive marks on the dorsal fin, with estimated mark rates of 0.336 (proportion) (SE = 0.041) and 0.352 (mean of estimates) (SE = 0.036). Permutation testing rejected the null hypothesis of random association between individuals (p < 0.0005). The best fit model of the standardized lagged association rate suggests short-term associations of individuals over hours to days and long-term associations with a subset of those individuals over years. When scaled according to mark rate, sets of long-term associates average approximately 11–12 individuals, a much lower estimate than that presented previously from drive-fishery data from the Faroe Islands. Genetic sampling of behaviourally studied individuals is recommended.

scholarly journals Long-term associations among male sperm whales (Physeter macrocephalus)

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0244204
Author(s):  
Hayao Kobayashi ◽  
Hal Whitehead ◽  
Masao Amano
Keyword(s):  
Physeter Macrocephalus ◽  
Sperm Whales ◽  
Association Rate ◽  
Photo Identification ◽  
Male Sperm ◽  
The Social ◽  
Pelagic Habitat ◽  
Best Fitting ◽  
Social Associations

Little is known about the social structure of male sperm whales (Physeter macrocephalus) after they leave their natal units. While previous studies found no evidence for preferred associations among males, the observation of mass-strandings consisting exclusively of males, suggest that they have strong social bonds. To investigate the social associations among male sperm whales, we used half weight index of association, permutation tests and standardized lagged association rate models on a large photo-identification database collected between 2006 and 2017 in Nemuro Strait, Japan. Our results suggest that while male sperm whales are not as social as females, they do form long term associations, have preferred companionship, and forage in social proximity to each other. The best-fitting model to the standardized lagged association rate showed that associations among males last for at least 2.7 years and as most males leave the area after 2 years, associations may last for longer. Twenty dyads were observed associating over more than 2 years, for a maximum 5 years. One dyad was observed associating on 19 different days and clustered on 7 different days. Male associations may function to enhance foraging or to fend off predators. Such relationships seem to be adapted to a pelagic habitat with uncertain resource availability and predation pressure.

scholarly journals Social survival: humpback whales (Megaptera novaeangliae) use social structure to partition ecological niches within proposed critical habitat

2020 ◽  
Author(s):  
Janie Wray ◽  
Eric Keen ◽  
Éadin N. O’Mahony
Keyword(s):  
Habitat Use ◽  
Social Structure ◽  
Niche Partitioning ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Baleen Whales ◽  
Fjord System ◽  
The Social ◽  
Social Niche

ABSTRACTAnimal culture and social bonds are relevant to wildlife conservation because they influence patterns of geography, behavior, and strategies of survival. Numerous examples of socially-driven habitat partitioning and ecological-niche specialization can be found among vertebrates, including toothed whales. But such social-ecological dynamics, described here as ‘social niche partitioning’, are not known among baleen whales, whose societies -- particularly on foraging grounds -- are largely perceived as unstructured and incidental to matters of habitat use and conservation. However, through 16 years of behavioral and photo-identification observations of humpback whales (Megaptera novaeangliae) feeding within a fjord system in British Columbia, Canada, we have documented long-term pair bonds (lasting up to 12 years) as well as a complex societal structure, which corresponds closely to persistent patterns in feeding strategy, long-term site fidelity (extended seasonal occupancy and annual rate of return up to 75%), specific geographic preferences within the fjord system, and other forms of habitat use. Randomization tests of network congruency and clustering algorithms were used to test for overlap in patterns of social structure and habitat use, which confirmed the occurrence of social niche partitioning on the feeding grounds of this baleen whale. In addition, we document the extensive practice of group bubble net feeding in Pacific Canada. This coordinated feeding behavior was found to strongly mediate the social structure and habitat use within this humpback whale society. Additionally, during our 2004 – 2019 study, we observed a shift in social network structure in 2010 – 2012, which corresponded with environmental and demographic shifts including a sudden decline in the population’s calving rate. Our findings indicate that the social lives of humpback whales, and perhaps baleen whales generally, are more complex than previously supposed and should be a primary consideration in the assessment of potential impacts to important habitat.

scholarly journals Long term analysis of social structure: evidence of age-based consistent associations in Alpine ibex

2021 ◽  
Author(s):  
Alice Brambilla ◽  
Achaz von Hardenberg ◽  
Cédric Sueur ◽  
Claudia Canedoli ◽  
Christina R Stanley
Keyword(s):  
Social Structure ◽  
Social Needs ◽  
Centrality Measures ◽  
Multi Scale ◽  
Alpine Ibex ◽  
Social Network Dynamics ◽  
Animal Populations ◽  
The Social ◽  
Term Analysis

ABSTRACTDespite its recognized importance for understanding the evolution of animal sociality as well as for conservation, long term analysis of social networks of animal populations is still relatively uncommon. We investigated social network dynamics in males of a gregarious mountain ungulate (Alpine ibex, Capra ibex) over ten years focusing on groups, sub-groups and individuals, exploring the dynamics of sociality over different scales. Despite the social structure changing between seasons, the Alpine ibex population was highly cohesive: fission-fusion dynamics lead almost every male in the population to associate with each other male at least once. Nevertheless, we found that male Alpine ibex showed preferential associations that were maintained across seasons and years. Age seemed to be the most important factor driving preferential associations while other characteristics, such as social status, appeared less crucial. We also found that centrality measures were influenced by age and were also related to individual physical condition. The multi-scale and long-term frame of our study helped us show that ecological constrains, such as resource availability, may play a role in shaping associations in a gregarious species, but they cannot solely explain sociality and preferential association that are likely also to be driven by life-history linked physiological and social needs. Our results highlight the importance of long-term studies based on individually recognizable subjects to help us build on our understanding of the evolution of animal sociality.

scholarly journals Strategic Alliances & Customer Impact: A Case Study Of Community Hospitals

2010 ◽  
Vol 8 (9) ◽  
Author(s):  
Mary Helen McSweeney-Feld ◽  
Suzanne Discenza ◽  
George L. De Feis
Keyword(s):  
Social Structure ◽  
Strategic Alliances ◽  
Strategic Alliance ◽  
Font Size ◽  
The Social ◽  
Formal Relationship ◽  
Alliance Partners ◽  
The Relationship

<p class="MsoNormal" style="text-align: justify; margin: 0in 0.5in 0pt; mso-pagination: none;"><span style="color: black; font-size: 10pt; mso-ansi-language: EN;" lang="EN"><span style="font-family: Times New Roman;">A s<span style="mso-bidi-font-weight: bold;">trategic alliance</span> (SA) is a mutually beneficial long-term formal relationship formed between two or more parties to pursue a set of agreed upon goals or to meet a critical business need while remaining independent organizations.<span style="mso-spacerun: yes;">&nbsp; </span>It is a synergistic arrangement whereby two or more organizations agree to cooperate in the carrying out of a business activity where each brings different strengths and capabilities to the arrangement.<span style="mso-spacerun: yes;">&nbsp; </span>The social structure of alliances has been considered previously (Gulati 1995, et al.), so instead of discussing the social structure relative to alliance partners, this paper looks at the relationship between the dyad alliance entity and its customer(s).<span style="mso-spacerun: yes;">&nbsp; </span>This newer aspect is particularly important when there are differences in trust and culture to consider (Das &amp; Teng 1998) between alliance partners.<span style="mso-spacerun: yes;">&nbsp; </span>Other considerations include authority, governance and structure, conflict, and the make-up of the strategic alliance, its partners, and the customer(s).<span style="mso-spacerun: yes;">&nbsp; </span></span></span><span style="color: black; font-size: 10pt;"></span></p>

Becoming a Merchant Adventurer

2020 ◽  
pp. 33-69
Author(s):  
Thomas Leng
Keyword(s):  
Life Cycle ◽  
Social Structure ◽  
Social Settings ◽  
The Social ◽  
The Status

This chapter addresses recruitment to the Company of Merchant Adventurers, focusing on the institution of apprenticeship. As well as being the most common means to join the Company, apprenticeship was used to manage overseas trade, with apprentices commonly deployed as agents overseas. The chapter introduces the social settings of Company trade overseas—the mart towns—and their place in the merchant life-cycle. It considers the opportunities and challenges facing aspiring Merchant Adventurers in the mart towns as they sought to assume the status of independent merchant in their own households. It also identifies significant changes in the social structure of the mart towns, associated with rising numbers of long-term residents, which had the potential to divide the Company’s different residences in England and overseas.

Life After a Death: The Experience of Bereavement in South Wales

1994 ◽  
Vol 14 (2) ◽  
pp. 191-217 ◽  
Author(s):  
Susan Pickard
Keyword(s):  
Social Structure ◽  
Long Term Effects ◽  
Special Position ◽  
Spouse Death ◽  
South Wales ◽  
The Social ◽  
Old Men ◽  
Female Networks ◽  
The Relationship

ABSTRACTThis paper looks at the experience of bereavement in old age in a South Wales locality and traces the immediate and long-term effects it has on the bereaved. It examines various categories of bereavement – death of spouse, death of the mother, death of a child, siblings and friends, with death of spouse as specially significant. In each category it closely relates the experience of bereavement to the nature of the relationship formerly maintained, arguing that the significance of bereavement can only be appreciated within the context of social structure which defines the meaning of these relationships. It suggests that the special position occupied by female networks in the social structure enables old women to cope with the effects of bereavement more successfully than old men. For both old men and old women however, the special position they occupy with respect to contemporary society gives death a particular and unique resonance.

scholarly journals Specialisation and plasticity in a primitively social insect

2020 ◽  
Author(s):  
S. Patalano ◽  
A. Alsina ◽  
C. Gregorio-Rodriguez ◽  
M. Bachman ◽  
S. Dreier ◽  
...  
Keyword(s):  
Dna Methylation ◽  
Social Structure ◽  
Social Insect ◽  
Spatial Scales ◽  
Biological Systems ◽  
List Type ◽  
Term Stability ◽  
Long Term Stability ◽  
The Social

AbstractBiological systems not only have the remarkable capacity to build and maintain complex spatio-temporal structures in noisy environments, they can also rapidly break up and rebuild such structures. How such systems can simultaneously achieve both robust specialisation and plasticity is poorly understood. Here we use primitive societies of Polistes wasps as a model system where we experimentally perturb the social structure by removing the queen and follow the re-establishment of the social steady state over time. We combine a unique experimental strategy correlating time-resolved measurements across vastly different scales with a theoretical approach. We show that Polistes integrates antagonistic processes on multiple scales to distinguish between extrinsic and intrinsic perturbations and thereby achieve both robust specialisation and rapid plasticity. The long-term stability of the social structure relies on dynamic DNA methylation which controls transcriptional noise. Such dynamics provide a general principle of how both specialization and plasticity can be achieved in biological systems.One Sentence SummaryA primitive social insect simultaneously achieves specialisation and plasticity by integrating antagonistic dynamics on different scales.HighlightsWe employ a unique experimental approach correlating dynamics of societies, individuals, and epigenetic gene regulationA social insect simultaneously achieves specialisation and plasticity by integrating antagonistic processes on different spatial scalesRegulation of population-level noise by DNA methylation ensures long-term stability of phenotypic specialisation

scholarly journals Social survival: Humpback whales (Megaptera novaeangliae) use social structure to partition ecological niches within proposed critical habitat

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0245409
Author(s):  
Janie Wray ◽  
Eric Keen ◽  
Éadin N. O’Mahony
Keyword(s):  
Habitat Use ◽  
Social Structure ◽  
Niche Partitioning ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Baleen Whales ◽  
Fjord System ◽  
The Social ◽  
Social Niche

Animal culture and social bonds are relevant to wildlife conservation because they influence patterns of geography, behavior, and strategies of survival. Numerous examples of socially-driven habitat partitioning and ecological-niche specialization can be found among vertebrates, including toothed whales. But such social-ecological dynamics, described here as ‘social niche partitioning’, are not known among baleen whales, whose societies—particularly on foraging grounds—are largely perceived as unstructured and incidental to matters of habitat use and conservation. However, through 16 years of behavioral observations and photo-identifications of humpback whales (Megaptera novaeangliae) feeding within a fjord system in the Canadian Pacific (primarily within Gitga’at First Nation waters), we have documented long-term pair bonds (up to 12 years) as well as a complex societal structure, which corresponds closely to persistent patterns in feeding strategy, long-term site fidelity (extended occupancy and annual rate of return up to 75%), specific geographic preferences within the fjord system, and other forms of habitat use. Randomization tests of network congruency and clustering algorithms were used to test for overlap in patterns of social structure and habitat use, which confirmed the occurrence of social niche partitioning on the feeding grounds of this baleen whale species. In addition, we document the extensive practice of group bubble net feeding in Pacific Canada. This coordinated feeding behavior was found to strongly mediate the social structure and habitat use within this humpback whale society. Additionally, during our 2004–2019 study, we observed a shift in social network structure in 2010–2012, which corresponded with environmental and demographic shifts including a sudden decline in the population’s calving rate. Our findings indicate that the social lives of humpback whales, and perhaps baleen whales generally, are more complex than previously supposed and should be a primary consideration in the assessment of potential impacts to important habitat.

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