Endangered Species Research
ESR is international and interdisciplinary. It publishes contributions reporting research on all species (and habitats) of conservation concern, whether they be classified as Near Threatened or Threatened (Endangered or Vulnerable) by the International Union for the Conservation of Nature and Natural Resources (IUCN) or highlighted as part of national or regional conservation strategies. Submissions on specific topics are welcome, e.g. on: conservation (ecology and economics of protection, genetics, medicine); restoration (population monitoring, biodiversity assessments, support of endangered life via breeding and re-introduction); effects of climate changes; effects of invasive species; sustainability of essential ecosystem functions and structures.
Current impact factor: 2.26
Impact Factor Rankings
|Website||Endangered Species Research website|
|Other titles||Endangered species research (Print), Endang species res, ESR|
|Material type||Periodical, Internet resource|
|Document type||Internet Resource, Journal / Magazine / Newspaper|
- Author can archive a pre-print version
- Author can archive a post-print version
- Author's pre-print on author's personal website, institutional website or institutional repository
- Author's post-print on author's personal website or institutional website
- Author's post-print on institutional repository after 12 months embargo
- Authors covered by funding agency rules, may post author's post-print in PubMed Central after a 6 months embargo
- If mandated by a funding agency or institution, the author's post-print may be deposited in institutional repository before 12 months, as long addendum is submitted
- Publisher's version/PDF may be used after 5 years embargo
- Publisher copyright and source must be acknowledged
- Reviewed 31/01/2014
Publications in this journal
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ABSTRACT: ABSTRACT: For threatened species or populations, variation in reproductive success among females may be explicitly linked with vulnerability to extinction. Thus an understanding of factors that may cause variability in reproductive success is important. The population of bottlenose dolphins in Doubtful Sound, New Zealand, has a recent history of rapid population decline and low calf survival rates. A previous study has shown high variability in calf survival among multiparous females. This study addresses the factors that seem most important in explaining variation in calf survival and thus reproductive success among females in this population. Reproductive data were sourced from a long-term photo-identification dataset, which allowed tracking the fate of 49 calves born into the population between 1995 and 2012. General linear mixed models combined with model averaging were used to assess how birth timing, maternal size, age and potential anthropogenic impacts contributed to variation in calf survival. Models show that a female’s size and her ability to give birth at an optimum time in the calving season are significant predictors of calf survival to 1 and 3 years. This is the first study to demonstrate how birth timing and mother size are correlated with female reproductive success in a cetacean species. These results confirm the importance of demographic stochasticity and reproductive heterogeneity in small, threatened marine mammal populations.
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ABSTRACT: Overfishing is considered one of the main threats to the health of global marine fish populations. Elasmobranchs that are characterized by low reproductive outputs may be particu- larly sensitive to intense fishing pressures. The sawfishes stand out as a highly threatened group, due in part to their life history in shallow coastal waters and their ease of capture. In Brazil, saw- fish populations are now virtually extinct and these declines have gone undocumented, leaving their precise causes and timing poorly understood. Here, based on ecological and fisheries know- ledge of local fishers, we document the disappearance of largetooth sawfish Pristis pristis from 5 estuaries on the central Brazilian coast. Fisher knowledge, combined with an estuarine morphol- ogy perspective, revealed important insights on this species, along with a timeline of its decline. Furthermore, fishers’ accounts of the protracted decline revealed clear inter-estuary differences in the timing of population declines, potentially influenced by local geomorphological features. The onset of sawfish population decline appears to have been earlier in estuaries with a direct connec- tion to the sea than in estuaries connected to an inner bay, occurring in the former case from the 1930s onward. A second wave of intensifying decline began in the 1970s in more structurally com- plex estuaries. Pressures from artisanal and modern fishery practices appear to have led to an ear- lier population decline in structurally less complex estuaries, while in larger and more complex ones this decline occurred decades later. The replacement of traditional by more modern fishing practices may have triggered the initial phase of local sawfish extinctions.
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ABSTRACT: Photo-identification (photo-ID) with camera traps was examined as a non-invasive method for studying and monitoring the critically endangered Saimaa ringed seal Phoca hispida saimensis. An average of 51 game cameras were set up at shoreline haulout sites in central Lake Saimaa during the moulting seasons in each of the years 2010−2014. Individuals were identified from their lifelong unique lateral fur patterns. A total of 220000 digital images of seals were obtained from these game cameras and from digital cameras during this period, allowing 164 individuals to be identified, 43% of which were re-sighted in successive years. In the majority of game camera images, both sides of the seal were shown and it was possible to determine the sex of the seal. The average distance between sightings of individual seals in different years was 1.6 km, suggesting that Saimaa ringed seals exhibit a high degree of moulting site fidelity. In addition, the results support suggestions of natal site fidelity. We propose that photo-ID sampling based on camera traps, and larger-scale photographic survey of the seals, should be implemented as a population monitoring tool of the Saimaa ringed seal. Further application of photo-ID technique may facilitate mark-recapture population and survival rate estimates for this threatened seal species and significant insights into its life history and social behaviour.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.