Vehicle collisions and dog attacks on Victorian koalas as evidenced by a retrospective analysis of sightings and admission records 1997 – 2011

2021 ◽  
Author(s):  
Rolf Schlagloth ◽  
Flavia Santamaria ◽  
Alistair Melzer ◽  
Marie R. Keatley ◽  
Wayne Houston
Keyword(s):  
Sex Ratio ◽  
State Government ◽  
Population Studies ◽  
Survival Rates ◽  
Data Gathering ◽  
Vehicle Collisions ◽  
Admission Rates ◽  
Effective Evaluation ◽  
Open Ground ◽  
Breeding Seasons

ABSTRACT Koalas moving across open ground risk dog attacks and collisions with vehicles when crossings roads. Historical records from a resident survey, two regional wildlife carers and a state government department wildlife shelter returns database for Victoria, Australia, were examined to determine the importance of certain admission types. Koala Vehicle Collisions (KVCs) and dog attacks were important contributors to the overall intake of injured koalas. However, KVCs were the most numerous recorded cause of koalas entering a wildlife shelter, and the most frequently assigned cause of death. There were relatively high rates of admission into care, and of death, for male koalas. Furthermore, almost twice as many individuals were admitted during the breeding season; sex ratio was not a differentiating characteristic of road-kills between breeding and non-breeding seasons, or by individual months. Comprehensive, accurate and detailed data gathering are essential for effective evaluation of the success of rehabilitation and release, as well as post release survival rates. This, together with population studies would determine whether admission rates reflect the sex ratio of local populations, and whether the high number of injured or killed females has an impact on their viability. Analyses of wildlife carer databases have great potential for decision making in koala conservation.

scholarly journals Methods, Developments, and Technological Innovations for Population Surveys

2021 ◽  
pp. 089443932199421
Author(s):  
Venera Tomaselli ◽  
Sebastiano Battiato ◽  
Alessandro Ortis ◽  
Giulio G. Cantone ◽  
Salvatore Urso ◽  
...  
Keyword(s):  
Population Studies ◽  
Data Gathering ◽  
Computational Social Science ◽  
Technological Innovations ◽  
Computer Assisted ◽  
Respondent Driven Sampling ◽  
Population Surveys ◽  
Panel Management ◽  
Dominant Paradigm ◽  
Social Science Approach

This article reviews contemporary issues in survey research, connecting established methods to innovative tools and technologies like real-time sensors and computer vision. This link takes into account the idea about the “organical” nature of Big Data, which represents a challenge toward a modernization of population studies in the light of technological innovations. The adopted dominant paradigm of data gathering is web survey (computer-assisted web interviewing), which is explored through the formalization of chain-referral methods as respondent-driven sampling. The general orientation is toward a computational social science approach. Weaknesses of such methodology is studied and solutions are provided with insights from empirical research on panel management. Contribution from gamification techniques is critically discussed.

Studies of the yellow-footed rock-wallaby, Petrogale xanthopus Gray (Marsupialia : Macropodidae). Population studies at Middle Gorge, South Australia

1994 ◽  
Vol 21 (4) ◽  
pp. 473 ◽  
Author(s):  
AC Robinson ◽  
L Lim ◽  
PD Cantry ◽  
RB Jenkins ◽  
CA MacDonald
Keyword(s):  
Sex Ratio ◽  
Population Studies ◽  
South Australia ◽  
Effective Rainfall ◽  
Main Study ◽  
Exchange System ◽  
Two Phase ◽  
Flinders Ranges ◽  
Significant Bias ◽  
Males And Females

A mark-recapture study of Petrogale xanthopus at Middle Gorge in the southern Flinders Ranges revealed that between January 1979 and January 1984 the estimated known-to-be-alive population ranged from 11 to 20. During the main study, individuals living to an estimated age of six years were recorded. Captures of marked animals after completion of the main study revealed both males and females living to at least 10 years old. Births occurred throughout the year but there appeared to be an increase in births following periods of effective rainfall. For the whole study the sex ratio of pouch young did not vary significantly from 1:1. When individuals that gave birth more than once during the study were examined, there was a significant bias towards male young in the later births. It is suggested that this species has a two-phase reproductive strategy with the extra males, produced by older females, sustaining a male-exchange system with nearby colonies.

Effects of adults on survival and recruitment of Peromyscus leucopus

1987 ◽  
Vol 65 (10) ◽  
pp. 2519-2523
Author(s):  
Gregory H. Adler ◽  
Mark L. Wilson ◽  
Michael J. DeRosa
Keyword(s):  
Adult Female ◽  
Adult Male ◽  
Peromyscus Leucopus ◽  
Survival Rates ◽  
Adult Males ◽  
Control Grid ◽  
Young Males ◽  
Young Females ◽  
Breeding Seasons ◽  
And Control

A population of Peromyscus leucopus (white-footed mouse) in northeastern Massachusetts was manipulated for 3 years to determine the effects of adults on survival and recruitment. Two experimental grids were established, from which either all adult males or all adult females were removed continually. The effects of these two manipulations were compared with demography on a control grid. Manipulations had no apparent effect on breeding intensity of young, survival rates of adults, or residency rates of adults and young. Recruitment of adult males was higher on the adult male removal grid than on the control grid. Recruitment rates of adult males and of young males and young females were lower on the adult female removal grid than on the control grid. Survival rates of young males were higher on the adult female removal grid than on the control grid; this effect may have been due to either reduced adult female residency or adult male recruitment. All differences between experimental and control grids were noted only during breeding seasons. Adult males apparently limited recruitment of adult consexuals. The effects of manipulations on other measured parameters were inconclusive because of high immigration rates of adult males onto the adult male removal grid and reduced recruitment of adult males and decreased production of young on the adult female removal grid.

Fledgling sex-ratio is biased towards the helping sex in a Neotropical cooperative breeder, the brown-and-yellow marshbird (Pseudoleistes virescens)

Behaviour ◽  
2021 ◽  
pp. 1-26
Author(s):  
Myriam E. Mermoz ◽  
Cecilia Villarruel ◽  
Alicia de la Colina ◽  
Bettina Mahler
Keyword(s):  
Sex Ratio ◽  
Breeding Success ◽  
Population Level ◽  
Adaptive Strategy ◽  
Individual Level ◽  
Cooperatively Breeding ◽  
Nestling Survival ◽  
Biased Sex Ratio ◽  
Communal Areas ◽  
Breeding Seasons

Abstract In many cooperatively breeding species, helpers increase the breeding success of their parents. The repayment hypothesis predicts a skewed sex-ratio towards the helping sex at population level; at individual level bias would increase in broods attended by a smaller number of helpers. We studied a brown-and-yellow marshbird (Pseudoleistes virescens) population during 11 breeding seasons. We found that 90% of helpers were males and that they increased nestling survival, although this effect disappeared in presence of parasitic shiny cowbirds. Helpers sometimes helped at nests of adults other than their parents. Population sex-ratio of fledglings was highly skewed towards males (1.4:1). At individual level, male-biased sex-ratio of fledglings was more pronounced early in the season and increased with brood losses but was not affected by number of helpers. Marshbirds feed at communal areas so retaining helpers would not be costly. Therefore, a general skew towards males might be the best adaptive strategy.

scholarly journals Long-Term Study of Apparent Survival in Pacific Golden-Plovers at a Wintering Ground on Oahu, Hawaiian Islands

The Auk ◽  
2001 ◽  
Vol 118 (2) ◽  
pp. 342-351 ◽  
Author(s):  
Oscar W. Johnson ◽  
Phillip L. Bruner ◽  
Jay J. Rotella ◽  
Patricia M. Johnson ◽  
Andrea E. Bruner
Keyword(s):  
Survival Rates ◽  
Winter Mortality ◽  
Apparent Survival ◽  
Open Population ◽  
Long Term Study ◽  
Minimum Age ◽  
Parsimonious Model ◽  
Territorial Status ◽  
Breeding Seasons ◽  
Wintering Ground

Abstract We monitored the apparent survival of territorial and nonterritorial Pacific Golden-Plovers (Pluvialis fulva) for 20 consecutive nonbreeding seasons at a wintering ground within Bellows Air Force Station (BAFS) on the eastern shore of Oahu, Hawaii. Territorial birds were especially site-faithful from season to season, and each surviving individual reoccupied the same territory held in previous seasons. On average, territorial birds were resighted for about twice as many postbanding seasons (4.2) as nonterritorial birds (1.8). Open-population modeling indicated that apparent survival varied by age and territorial status. Our most parsimonious model estimated apparent annual survival rates in territorial plovers as 0.90 for young birds (age determined from retained juvenal primaries) from their first through their second wintering season, and 0.80 for adults over numerous seasons. For nonterritorial plovers, the corresponding values were 0.82 and 0.67, respectively. Despite lower apparent survival in nonterritorial plovers, it remains uncertain whether nonterritoriality actually results in shorter life spans. Some surviving nonterritorial birds may have gone undetected (detection probability of 0.70) because of permanent emigration from the study area. Given strong site-fidelity of territorial birds and the relative certainty of detecting them (probability = 1.0), we regarded the disappearance of a plover from its territory as an indicator of mortality. From last-recorded sightings, we concluded that territorial birds died with about equal frequency during the nonbreeding and breeding seasons. Because the latter is of much shorter duration, time-relative hazards were greatest while birds were away from the wintering grounds. Winter mortality was caused by accidents (collisions with overhead wires and other obstructions), and probable predation by owls. We estimated mean additional life expectancy among territorial plovers at 5.1 years for first-year birds, and 4.5 years for unknown-age adults. The oldest known-age individual was a male that lived 13 years 10 months; in adults of uncertain ages, one male survived to a minimum age of 18 years 10 months, and two females to at least 17 years 10 months. Pacific Golden-Plovers wintering at BAFS, especially territorial birds, demonstrated relatively high rates of apparent survival combined with adaptability for coexistence with humans in an urban environment.

scholarly journals GPS tracking reveals highly consistent use of restricted foraging areas by European Storm-petrels Hydrobates pelagicus breeding at the largest UK colony: implications for conservation management

2020 ◽  
pp. 1-18
Author(s):  
MARK BOLTON
Keyword(s):  
High Precision ◽  
Survival Rates ◽  
Gps Tracking ◽  
Conservation Action ◽  
Seabird Species ◽  
Adult Body Mass ◽  
Statutory Protection ◽  
Precision Tracking ◽  
High Concentrations ◽  
Breeding Seasons

Summary Seabirds face a diverse array of threats and are considered to comprise one of the most threatened avian groups globally. Development of appropriate conservation action requires a knowledge of the marine distribution of seabirds, furnished either by tracking the movements of individuals, or from at-sea surveys. Obtaining information on the distribution of the smallest seabird species, the storm-petrels Hydrobatidae, is challenging, but the recent development of <1 g GPS tracking tags now enables high-precision tracking and this study reports the first multi-year high-precision tracking of European Storm-petrels Hydrobates pelagicus from their largest UK breeding colony. A total of 42 successful tag deployments were made over four breeding seasons during incubation, brooding and post-brood phases, and there was no evidence of adverse impacts on adult body mass or nest survival rates. Foraging trips lasted between one and three days and ranged up to 397 km from the colony (median = 159 km). Foraging range and total distance covered were positively correlated with trip duration but did not differ across breeding stages. Storm-petrels did not feed to the west of the colony at the edge of the continental shelf where high concentrations have been reported in previous decades from boat surveys, but rather, foraging was restricted to shallow waters south of the colony, consistent across individuals, breeding stages and years. Two areas were identified that exceed the threshold criteria for marine Important Bird Area status and should be considered for statutory protection. The home range estimated across all three breeding stages overlapped with 206 active hydrocarbon wells and 14 operating platforms which represent potential threats as sources of surface pollution or through attraction of birds to gas flares. Improved understanding of the foraging distribution of storm-petrels from this protected colony greatly assists the identification of potential threats and informs appropriate marine spatial planning.

Chick survival in the megapode Alectura lathami (Australian brush-turkey)

2002 ◽  
Vol 29 (5) ◽  
pp. 503 ◽  
Author(s):  
Ann Göth ◽  
Uwe Vogel
Keyword(s):  
Survival Time ◽  
Survival Rates ◽  
Chick Survival ◽  
Average Survival Time ◽  
Kaplan Meier ◽  
Average Survival ◽  
Introduced Predators ◽  
Management Plans ◽  
Alectura Lathami ◽  
Breeding Seasons

Megapode chicks live independently from the time of hatching and are thus ideal subjects for investigations into how the lack of parental care can affect chick survival. Here, we present such results for chicks of the Australian brush-turkey (Alectura lathami), radio-tracked in two smallremnant rainforest patches (Mary Cairncross Rainforest Park and Aplin Forest) from their second day of life. Mortality was 88–100% during the first three weeks after hatching. It did not differ between two breeding seasons at Mary Cairncross Rainforest Park, as evident from comparisons of average survival time (in days) and Kaplan–Meier survival estimates. Survival differed, though, between the two sites in the same breeding season: the average survival time was significantly higher at Aplin Forest (8 days compared with 3�days) and the Kaplan–Meier survival estimates decreased less sharply. Predation by cats and birds of prey exerted the greatest influence on survival, but the proportion of deaths caused by these two predators was approximately the same at both sites. The main factor affecting survival was obviously the availability of thickets, which were more abundant at Aplin Forest. The survival rates of chicks released in thickets was significantly higher than of those released in the rainforest, presumably because they were better protected from predators. For chicks living in thickets the likelihood of being killed was lower than expected, but it was higher for those remaining in rainforest. On the basis of these results, we propose that management plans for endangered megapodes should include the identification and protection of large protective thicket habitats for enhancing overall chick survival, apart from controlling introduced predators such as feral cats.

scholarly journals Information and Communication Technology Deployment, Policies and Use in Emergency Management among Lagos State Government Agencies

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
Ruqayat Oyetinuoye Uthman ◽  
Kemi Ogunsola
Keyword(s):  
Emergency Management ◽  
Information And Communication Technology ◽  
State Government ◽  
Communication Technology ◽  
Data Gathering ◽  
Federal State ◽  
Government Agencies ◽  
Factors Affecting ◽  
Emergency Situations ◽  
Information And Communication

This study examined the factors affecting use of information and communication technology (ICT) in the management of emergency situations in Lagos, Nigeria. The study adopted the qualitative approach in data gathering. Face-to-face interview was conducted with 15 key informants at 12 emergency management agencies which were selected out of a total of 43 agencies through multistage sampling. The agencies were first stratified into federal, state and non-governmental agencies and the selection of agencies as well as respondents was done using purposive sampling method. The selected respondents consisted of ICT personnel, risk management officers and other top management officers, such as directors, assistant directors/heads of department, and supervisors. The result showed that there were no suitable organisational or operational structures that could assist the deployment of ICT in emergency situations at the selected agencies; however, there was a high level of basic appreciation of simple ICT tools and facilities. The study recommended that agencies with no presence on the social media should create accounts through which they can share information and also interact with citizens as well as other agencies. Furthermore, there is a need to have additional policies at the state government level with regards to emergency management. It was also recommended that government agencies should acquire and use sophisticated technology equipments which can promote emergency management.

scholarly journals BROODSTOCK SEX RATIO IMPROVES FRY PRODUCTION IN NILE TILAPIA(OREOCHROMIS NILOTICUS) IN NORTHERN SENEGAL

2021 ◽  
Vol 9 (02) ◽  
pp. 72-76
Author(s):  
Mouhamadou Amadou Ly ◽  
◽  
Abdoulaye Ngom ◽  
Ahmadou Bamba Fall ◽  
Ousmane Diouf ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Sex Ratios ◽  
Survival Rates ◽  
Fish Farming ◽  
Commercial Diet ◽  
Ph Values ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Female Survival

This present study was conducted to determine fry production in different male-female sex ratios of Oreochromis niloticusbroodstock in order to improve fry production, which handicapped the development of fish farming in northern Senegal. A total of 180 broodfish (47 males and 133 females) were stocked at a density of 2 fish /m2and was replicated three times for each sex ratio of 1:2, 1:3and 1:4 (male : female). Mean body weight ranges from 136.47±2.13 and 107.27±2.14 g for female and male O. niloticusbroodstock, respectively. The experiment was conducted for 90 days and the broods were fed on commercial diet containing 32% crude protein.Fish were held in 9 rectangular tanks of 30 m3 each (10 × 3 × 1) and half-filled. The results showed that number of fry produced at different sex ratios were significantly different, with sex ratio of 1:2 producing a highest number of fry (279.67) per female, followed by the 1:3and 1:4 treatment recorded the lowest.Broodstock sex ratios also did not affect female survival rates and all treatments had 100% survival rates. Temperature, dissolved oxygen and pH values obtained were suitable for good water quality and normal tilapia reproduction.In conclusion, the results of the present study recommend to stock Oreochromis niloticus brooders when stocked at a density of 2 fish /m2 at a sex ratio of 1 male : 2 female in order to obtain the highest fry production.

Ecological characteristics of high quality wild ornamental plants in South China

2020 ◽  
pp. 1-8
Author(s):  
Linlin Cong ◽  
Dong Han
Keyword(s):  
Plant Species ◽  
Southern China ◽  
Ornamental Plants ◽  
Survival Rates ◽  
Urban Environments ◽  
Wild Plant ◽  
Rapid Decline ◽  
High Germination ◽  
Open Ground ◽  
Urban Conditions

Abstract Around 6.000 plant species in China have ornamental uses. This study aims to identify new ornamental plant species that are able to survive in urban environments of China and not stand out from the landscaping plants growing in the local parks, gardens, and walkways. The list of ornamental plants includes exclusively open-ground plants. The study on 29 wild plant species commonly found across Southern China involved growing plants from 9.200 seeds and measuring their survival at the first (herbals) and the fifth 5 year of age (shrubs and trees). Of all study plants, 16 showed high germination and survival rates (over 50%) and can be used in park and city landscaping, whereas other specimens demonstrated survival rates lower than 50%. For lianas, the number of species suitable for landscaping is 3. Low germination rates did not determine a rapid decline in survival during the first and fifth years. Herbals turned out to have the highest germination rates (over 50% in 6 out of 7 specimens). Among trees, species that may be planted together along sidewalks to form groves and plantations include Ilex latifolia, Delavaya toxocarpa, and Vernicia fordii. Among vines, Trachelospermum jasminoides or star jasmine can be used as a tree climber. Among shrubs and herbals, Melastoma dodecandrum and Corydalis edulis can be planted in flower beds and rock gardens. This work examines plant species not only from the decorative prospective but also in terms of suitability for growing in urban conditions.

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