Resident Pods Research Articles

Virtual Remote Attending Supervision in an Academic Emergency Department During the COVID-19 Pandemic.

Background: As the surge of patients with COVID-19 increased, our academic university faculty needed to explore ways to protect the more vulnerable physicians in the group from infection while maintaining the service to our patients and the educational objectives of our residency training program. Methods: We utilized telehealth carts used for other purposes in the institution and the ED to allow the replacement of one physically present supervising attending physician with a virtual remote attending physician. This physician, working from home, can be virtually present for resident history and physicals with all patients in the supervised pod. Discussions about patient care, review of studies, and decision on final disposition can also be performed. Resident teaching can also be accomplished. Results: Our innovation represents a novel use of telemedicine capabilities which allows us to protect vulnerable faculty from infection during the COVID-19 pandemic while maintaining appropriate EM resident supervision and patient care. We found some advantages of this process which allow us to more directly observe the initial resident assessment of the patient. The residents responded favorably to the degree of supervision and patient care that we can provide remotely. Conclusions: Our novel use telemedicine during the COVID-19 pandemic has allowed us to decrease the exposure of more vulnerable faculty while maintaining the ability of these faculty to continue to contribute to patient care and resident education. It is well accepted by our residents and seems to be a viable alternative to physical presence in the ED for at least one faculty member. This modality might also be utilized by an attending who fell ill and was not yet able to return to physical work. We hope our description of this process might be useful to other academic departments or community hospital groups who may have at-risk members.

Commentaries on health services research

Commentaries on health services research

Marine Mammal Monitoring on Guam

Data on marine mammals, specifically information on their stock numbers, seasonal migrations, population structure, habitat use, and behaviors is limited. This study of island associated resident pods of the long nosed spinner dolphin (Stenella longirostris) was conducted near the island of Guam, part of the Mariana Archipelago, south of Japan. These spinner dolphins may be negatively impacted by an increased United States military presence on Guam which leads to expanded training activity, population growth, coastal development and associated tourism. This study compiles historical and current data on marine mammal sightings and behaviors to study possible impact of US military presence. The long nosed spinner dolphins (S. longirostris) are of particular interest because of their proximity to shorelines, their habitat use, and their daily activity schedule. Current data was collected from interviews and sighting events. Standard photo documentation and field survey protocols developed by the National Marine Fisheries Service (NMFS) Pacific Islands Fisheries Science Center (PIFSC) were used. This study created a preliminary marine mammal database for Guam and has expanded the limited information available. In addition, sighting information was used along with geographical information system (GIS) software to combine NOAA benthic habitat maps with multibeam bathymetry to gain a better understanding of the habitats occupied by documented species. Preliminary results suggest that S. longirostris populations in Guam have similar circadian and seasonal rhythms as Hawaiian S. longirostris populations. The results also demonstrate that Guam spinner dolphins show a preference for clear, relatively shallow open water bays with underlying, unconsolidated sediment (sandy bottoms). An increase in military use of shallow bays and dolphin-associated ecotourism could therefore negatively impact resident populations of the Guam spinner dolphins.

Acoustic presence of killer whales in Resurrection Bay, Alaska during May–June 2010.

Killer whales produce three different types of calls: whistles, pulsed calls, and clicks. Pulsed calls have been studied in detail to determine their relation to social organization and behavior as well as pod or individual identification. The functions of whistles is not well known, but are thought to be used for close-range communication. Clicks are mainly used for echolocating. The vocal repertoire of killer whales recorded in Resurrection Bay, AK during May and June 2010 was investigated to determine their call characteristics and diel calling patterns. Data were recorded using an Ecological Acoustic Recorder, which sampled at 20 kHz on a 75% duty cycle. The characteristics of 12 loud and clear calls were compared to calls of known resident and transient pods [Yurk et al. (2002); Saulitis et al. (2005), respectively] to determine which pods were present in Resurrection Bay during this time. The most commonly identified calls were pulsed calls. Four calls could have belonged to resident pods (AD, AJ, or AK) and one could have belonged to the AT1 transient pod. Calling occurred more often during the day, but there was no real night time during the survey. Daytime calling may have been used for socializing.

The social dynamics of southern resident killer whales and conservation implications for this endangered population

Quantitatively characterizing the social structure of a population provides important insight into the forces shaping key population processes. Moreover, long-term social dynamics provide an avenue for understanding population-level responses to changes in socioecological conditions. This is particularly true for species that show natal philopatry and highly stable hierarchically structured social units, such as the piscivorous resident killer whales of the northeast Pacific. The southern resident killer whale population is a small, demographically closed population, comprising three commonly recognized pods (J, K and L pods), that has recently been listed as endangered throughout its range in both Canadian and U.S.A. waters. In this study, we quantitatively assessed social structure in this population from 29 years of photo-identification data to characterize significant temporal changes in sociality. Preferential affiliation among killer whales within both genealogical matrilines and pods was supported by two different analytical methods and, despite interannual variability, these social clusters persisted throughout the study. All three pods experienced fluctuations in social cohesion over time, but the overall rate of intrapod affiliation was consistently lowest within L pod, the largest of the southern resident pods. The most recent increase in fluidity within social units, occurring in the mid to late 1990s, was coincident with a significant decline in population size, suggesting a possible common response to external stressors. Quantifying these trends in social structure is the first step towards understanding the causes and consequences of long-term changes in killer whale social structure.

Ongoing population-level impacts on killer whales Orcinus orca following the ‘Exxon Valdez’ oil spill in Prince William Sound, Alaska

Killer whales were photographed in oil after the 1989 'Exxon Valdez' oil spill, but pre- liminary damage assessments did not definitively link mortalities to the spill and could not evaluate recovery. In this study, photo-identification methods were used to monitor 2 killer whale populations 5 yr prior to and for 16 yr after the spill. One resident pod, the AB Pod, and one transient population, the AT1 Group, suffered losses of 33 and 41%, respectively, in the year following the spill. Sixteen years after 1989, AB Pod had not recovered to pre-spill numbers. Moreover, its rate of increase was significantly less than that of other resident pods that did not decline at the time of the spill. The AT1 Group, which lost 9 members following the spill, continued to decline and is now listed as depleted under the Marine Mammal Protection Act. Although there may be other contributing factors, the loss of AT1 individuals, including reproductive-age females, accelerated the population's trajectory toward extinction. The synchronous losses of unprecedented numbers of killer whales from 2 ecologi- cally and genetically separate groups and the absence of other obvious perturbations strengthens the link between the mortalities and lack of recovery, and the 'Exxon Valdez' oil spill.

Influence of life-history parameters on organochlorine concentrations in free-ranging killer whales ( Orcinus orca) from Prince William Sound, AK

Certain populations of killer whales ( Orcinus orca) have been extensively studied over the past 30 years, including populations that use Puget Sound, WA, the inside waters of British Columbia, Southeastern Alaska and Kenai Fjords/Prince William Sound, Alaska. Two eco-types of killer whales, ‘transient’ and ‘resident’, occur in all of these regions. These eco-types are genetically distinct and differ in various aspects of morphology, vocalization patterns, diet and habitat use. Various genetic and photo-identification studies of eastern North Pacific killer whales have provided information on the male–female composition of most of these resident pods and transient groups, as well as the approximate ages, reproductive status and putative recruitment order (birth order) of the individual whales. Biopsy blubber samples of free-ranging resident and transient killer whales from the Kenai Fjords/Prince William Sound, AK region were acquired during the 1994–1999 field seasons and analyzed for selected organochlorines (OCs), including dioxin-like CB congeners and DDTs. Concentrations of OCs in transient killer whales (marine mammal-eating) were much higher than those found in resident animals (fish-eating) apparently due to differences in diets of these two killer whale eco-types. Certain life-history parameters such as sex, age and reproductive status also influenced the concentrations of OCs in the Alaskan killer whales. Reproductive female whales contained much lower levels of OCs than sexually immature whales or mature male animals in the same age class likely due to transfer of OCs from the female to her offspring during gestation and lactation. Recruitment order also influenced the concentrations of OCs in the Alaskan killer whales. In adult male residents, first-recruited whales contained much higher OC concentrations than those measured in non-first-recruited (e.g. second recruited, third recruited) resident animals in the same age group. This study provides baseline OC data for free ranging Alaskan killer whales for which there is little contaminant information.

DISTRIBUTION OF KILLER WHALE PODS IN PRINCE WILLIAM SOUND, ALASKA 1984–1996

AbstractThirteen years of encounter data (1984–1996) were used to examine killer whale distribution within Prince William Sound, Alaska. Four patterns of area use were found, which comprised differences between resident pods and transient groups and differences among resident groups. Resident pods frequented large open passages, while transient groups used the narrow passages and bays in the southwest. This dichotomy likely reflects resident use of salmon and transient use of pinniped prey resources, as well as the different foraging strategies required for these prey types. Four resident pods (AB, AI, AJ, and AN) used Knight Island Passage more than other areas of the Sound; two (AE and AK) used all areas of the Sound more evenly. Use of the Sound by the AT1 transient whales declined in the latter part of the study. Nearshore foraging for pinniped prey by the AT1 transient whales was more common in areas where these whales spend a disproportionate amount of time, suggesting that these areas were critical foraging habitat for them. No similar pattern emerged for Open‐water Foraging for cetaceans by AT1 whales, nor for foraging by the resident whales.

Acoustic behaviour of resident killer whales (Orcinus orca) off Vancouver Island, British Columbia

Recordings of underwater vocalizations and behavioural observations were collected from 16 photographically identified resident pods of killer whales (Orcinus orca) off Vancouver Island, British Columbia, during 1978–1983. Vocalizations recorded during 43 days spent with three representative pods were analyzed for each of five activity states: foraging, travelling, group-resting, socializing, and beach-rubbing. The whales produced three types of sounds that were assumed to be social signals: discrete calls, variable calls, and aberrant calls. Discrete calls dominated vocalization in most contexts. An increase in production of variable and aberrant calls was observed during socializing and beach-rubbing activities. Each resident pod had a group-specific repertoire of 7–17 discrete call types (mean = 10.7) that was consistent over a number of years. The relative use of different calls varied with activity, but no call type was correlated exclusively with any behaviour or circumstance that could be identified. Discrete calls probably function as intragroup contact signals to maintain pod cohesion and coordinate activities. Structural modulations of standard call formats and variations in frequencies of call use appear to carry information on the emotional state of vocalizing individuals. Group-specific repertoires of calls may increase the effectiveness and reliability of this contact system and function as indicators of pod affiliation.