Population ecology of the long-nosed potoroo (Potorous tridactylus) on French Island, Victoria

2011 ◽  
Vol 33 (1) ◽  
pp. 73 ◽  
Author(s):  
Greta J. Frankham ◽  
Robert L. Reed ◽  
Terry P. Fletcher ◽  
Kath A. Handasyde
Keyword(s):  
Site Fidelity ◽  
Management Strategies ◽  
Native Forest ◽  
Important Species ◽  
Specific Data ◽  
Testis Volume ◽  
High Site ◽  
Term Data ◽  
Potorous Tridactylus

The elusive nature of the long-nosed potoroo (Potorous tridactylus) has hindered the collection of long-term data for this threatened species. Between June 2005 and May 2009, data on the ecology of a wild population of long-nosed potoroos located on French Island, Victoria, were collected during a series of research projects. Over this period, 33 individual potoroos were trapped a total of 251 times. Up to nine individuals were known to be alive at once on the 15-ha study site of mature remnant native forest. Adult potoroos showed high site fidelity and significant sexual size dimorphism, with males heavier and having longer head and pes lengths than females. Congruent with other studies, we found no evidence of seasonality in breeding. Births occurred in every month of the year and the testis volume of males did not vary throughout the year. In contrast to previous studies, however, we did not observe peaks in breeding activity. Our research and review of existing literature suggests that the ecology of the long-nosed potoroo is strongly influenced by local environmental conditions and emphasises the need to consider long-term and site-specific data when developing management strategies to conserve this ecologically important species.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Site Fidelity ◽  
Late Summer ◽  
High Survival ◽  
Population Abundance ◽  
Conservation Ecology ◽  
Temporary Emigration ◽  
Minnesota River ◽  
Flathead Catfish ◽  
High Site

<em>Abstract</em>.—The flathead catfish <em>Pylodictis olivaris</em> is one of the most important game fishes in the lower Minnesota River, providing a high-quality angling fishery. Information on flathead catfish movements and site fidelity in the Minnesota River at the reach scale is needed before fisheries managers consider options such as reach-specific fishing regulations. In addition, this information is necessary to determine if estimates of population abundance are feasible and what study design is most appropriate. Therefore, 18 radio- and acoustic-tagged adult flathead catfish were manually located in the lower Minnesota River during late summer and fall in 2008 and 2009. Most fish remained within about 2 km of their capture locations during daylight hours in August–September 2008. However, 17% of the fish emigrated from the 9.3-km study reach before the end of September, and all emigrated by the end of October. Fourteen (78%) of the original 18 fish survived and were present in the study reach again during August–September 2009. High site fidelity could result in heterogeneous vulnerability to late-summer angling among river reaches if some individual fish consistently return to areas frequented by anglers and others return to more remote and relatively inaccessible areas. Due to high survival and late-summer site fidelity, the potential exists for high recapture probabilities with repeated late-summer mark–recapture sampling in the same study reach; however, there is evidence that temporary emigration could be an important issue in long-term studies.

Coral reef gastropods - a sustainable resource?

1995 ◽  
Vol 2 (2) ◽  
pp. 142 ◽  
Author(s):  
Ann L. Poulsen
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Management Strategies ◽  
Local Extinction ◽  
Pacific Region ◽  
Vulnerable Species ◽  
Important Species ◽  
Commercially Important ◽  
Ornamental Species

Large, colourful coral reef gastropods including the Giant Triton Charonia tritonis,helmet shells (Cassidae), cowries (Cypraeidae) and volutes (Volutidae) are exploited in an unregulated and unsustainable way throughout much of the Indo-Pacific region. The consequences for their populations, for the populations of their prey or for the ecology of their habitats are rarely considered. Serious decline in stocks of edible coral reef molluscs through unregulated harvesting demonstrates the need for controls on the collection and trade of commercially important species. Continued, unrestricted collecting will eventually lead to the local extinction of vulnerable species on substantial numbers of reefs. Research on the biology and ecology of ornamental species is urgently needed to facilitate the implementation of appropriate management strategies for long-term utilization. A co-operative effort to monitor and regulate trade will also contribute toward the maintenance of sustainable gastropod populations on coral reefs.

High site fidelity, strong associations, and long‐term bonds: Short‐finned pilot whales off the island of Hawai‘i

2015 ◽  
Vol 31 (4) ◽  
pp. 1427-1451 ◽  
Author(s):  
Sabre D. Mahaffy ◽  
Robin W. Baird ◽  
Daniel J. McSweeney ◽  
Daniel L. Webster ◽  
Gregory S. Schorr
Keyword(s):  
Site Fidelity ◽  
High Site ◽  
Pilot Whales

The contribution of genetics and genomics to understanding the ecology of the mountain pine beetle system

2019 ◽  
Vol 49 (7) ◽  
pp. 721-730 ◽  
Author(s):  
Catherine I. Cullingham ◽  
Jasmine K. Janes ◽  
Richard C. Hamelin ◽  
Patrick M.A. James ◽  
Brent W. Murray ◽  
...  
Keyword(s):  
Mountain Pine Beetle ◽  
Management Strategies ◽  
Dutch Elm Disease ◽  
Native Forest ◽  
Forest Insect ◽  
Genetic Studies ◽  
Long Term Study ◽  
Mountain Pine ◽  
Pine Beetle

Environmental change is altering forest insect dynamics worldwide. As these systems change, they pose significant ecological, social, and economic risk through, for example, the loss of valuable habitat, green space, and timber. Our understanding of such systems is often limited by the complexity of multiple interacting taxa. As a consequence, studies assessing the ecology, physiology, and genomics of each key organism in such systems are increasingly important for developing appropriate management strategies. Here we summarize the genetic and genomic contributions made by the TRIA project — a long-term study of the mountain pine beetle (Dendroctonus ponderosae Hopkins) system encompassing beetle, fungi, and pine. Contributions include genetic and genomic resources for species identification, sex determination, detection of selection, functional genetic analysis, mating system confirmation, hybrid stability tests, and integrated genetic studies of multiple taxa. These resources and subsequent findings have accelerated our understanding of the mountain pine beetle system, facilitating improved management strategies (e.g., enhancements to stand susceptibility indices and predictive models) and highlighting mechanisms for promoting resilient forests. Further, work from the TRIA project serves as a model for the increasing number and severity of invasive and native forest insect outbreaks globally (e.g., Dutch elm disease and thousand cankers disease).

scholarly journals Dental and Oral Manifestations of COVID-19 Related Mucormycosis: Diagnoses, Management Strategies and Outcomes

2021 ◽  
Vol 8 (1) ◽  
pp. 44
Author(s):  
Omer Sefvan Janjua ◽  
Muhammad Saad Shaikh ◽  
Muhammad Amber Fareed ◽  
Sana Mehmood Qureshi ◽  
Muhammad Ikram Khan ◽  
...  
Keyword(s):  
Fungal Infections ◽  
Case Reports ◽  
Management Strategies ◽  
Case Series ◽  
Histopathological Analysis ◽  
The Novel ◽  
The Subject ◽  
Novel Coronavirus ◽  
Term Data

It has been nearly two years since the pandemic caused by the novel coronavirus disease (COVID-19) has affected the world. Several innovations and discoveries related to COVID-19 are surfacing every day and new problems associated with the COVID-19 virus are also coming to light. A similar situation is with the emergence of deep invasive fungal infections associated with severe acute respiratory syndrome 2 (SARS-CoV-2). Recent literature reported the cases of pulmonary and rhino-cerebral fungal infections appearing in patients previously infected by COVID-19. Histopathological analysis of these cases has shown that most of such infections are diagnosed as mucormycosis or aspergillosis. Rhino-orbital-cerebral mucormycosis usually affects the maxillary sinus with involvement of maxillary teeth, orbits, and ethmoidal sinuses. Diabetes mellitus is an independent risk factor for both COVID-19 as well as mucormycosis. At this point, there is scanty data on the subject and most of the published literature comprises of either case reports or case series with no long-term data available. The aim of this review paper is to present the characteristics of COVID-19 related mucormycosis and associated clinical features, outcome, diagnostic and management strategies. A prompt diagnosis and aggressive treatment planning can surely benefit these patients.

scholarly journals Implantation and Recovery of Long-Term Archival Transceivers in a Migratory Shark with High Site Fidelity

PLoS ONE ◽  
2016 ◽  
Vol 11 (2) ◽  
pp. e0148617 ◽  
Author(s):  
Danielle E. Haulsee ◽  
Dewayne A. Fox ◽  
Matthew W. Breece ◽  
Tonya M. Clauss ◽  
Matthew J. Oliver
Keyword(s):  
Site Fidelity ◽  
High Site

Hydrogeological responses in tropical mountainous springs

2019 ◽  
Author(s):  
Ricardo Sánchez-Murillo
Keyword(s):  
Costa Rica ◽  
Isotope Composition ◽  
Central Valley ◽  
Distribution Functions ◽  
Geochemical Composition ◽  
Transit Times ◽  
Management Plans ◽  
Best Fit ◽  
Term Data

This study presents a hydrogeochemical analysis of spring responses (2013-2017) in the tropical mountainous region of the Central Valley of Costa Rica. The isotopic distribution of δ18O and δ2H in rainfall resulted in a highly significant meteoric water line: δ2H = 7.93×δ18O + 10.37 (r2=0.97). Rainfall isotope composition exhibited a strong dependent seasonality. The isotopic variation (δ18O) of two springs within the Barva aquifer was simulated using the FlowPC program to determine mean transit times (MTTs). Exponential-piston and dispersion distribution functions provided the best-fit to the observed isotopic composition at Flores and Sacramento springs, respectively. MTTs corresponded to 1.23±0.03 (Sacramento) and 1.42±0.04 (Flores) years. The greater MTT was represented by a homogeneous geochemical composition at Flores, whereas the smaller MTT at Sacramento is reflected in a more variable geochemical response. The results may be used to enhance modelling efforts in central Costa Rica, whereby scarcity of long-term data limits water resources management plans.

Connecting Crop Nutrient Use Efficiency to Future Soil Productivity

2018 ◽  
Vol 102 (4) ◽  
pp. 8-10
Author(s):  
Fernando García ◽  
Andrés Grasso ◽  
María González Sanjuan ◽  
Adrián Correndo ◽  
Fernando Salvagiotti
Keyword(s):  
Nutrient Management ◽  
Nutrient Use Efficiency ◽  
Management Strategies ◽  
Crop Productivity ◽  
Soil Productivity ◽  
Nutrient Use ◽  
Grain Crop ◽  
Wide Scale ◽  
Use Efficiency

Trends over the past 25 years indicate that Argentina’s growth in its grain crop productivity has largely been supported by the depletion of the extensive fertility of its Pampean soils. Long-term research provides insight into sustainable nutrient management strategies ready for wide-scale adoption.

Petroclival meningiomas: long-term outcomes of multimodal treatments and management strategies based on 30 years of experience at a single institution

2020 ◽  
Vol 132 (6) ◽  
pp. 1675-1682 ◽  
Author(s):  
Jin Wook Kim ◽  
Hee-Won Jung ◽  
Yong Hwy Kim ◽  
Chul-Kee Park ◽  
Hyun-Tai Chung ◽  
...  
Keyword(s):  
Adjuvant Treatment ◽  
Management Strategies ◽  
Local Tumor Control ◽  
Tumor Control ◽  
Years Of Experience ◽  
Local Tumor ◽  
Long Term Outcomes ◽  
Single Institution ◽  
Petroclival Meningiomas

OBJECTIVEA thorough investigation of the long-term outcomes and chronological changes of multimodal treatments for petroclival meningiomas is required to establish optimal management strategies. The authors retrospectively reviewed the long-term clinical outcomes of patients with petroclival meningioma according to various treatments, including various surgical approaches, and they suggest treatment strategies based on 30 years of experience at a single institution.METHODSNinety-two patients with petroclival meningiomas were treated surgically at the authors’ institution from 1986 to 2015. Patient demographics, overall survival, local tumor control rates, and functional outcomes according to multimodal treatments, as well as chronological change in management strategies, were evaluated. The mean clinical and radiological follow-up periods were 121 months (range 1–368 months) and 105 months (range 1–348 months), respectively.RESULTSA posterior transpetrosal approach was most frequently selected and was followed in 44 patients (48%); a simple retrosigmoid approach, undertaken in 30 patients, was the second most common. The initial extent of resection and following adjuvant treatment modality were classified into 3 subgroups: gross-total resection (GTR) only in 13 patients; non-GTR treatment followed by adjuvant radiosurgery or radiation therapy (non-GTR+RS/RT) in 56 patients; and non-GTR without adjuvant treatment (non-GTR only) in 23 patients. The overall progression-free survival rate was 85.8% at 5 years and 81.2% at 10 years. Progression or recurrence rates according to each subgroup were 7.7%, 12.5%, and 30.4%, respectively.CONCLUSIONSThe authors’ preferred multimodal treatment strategy, that of planned incomplete resection and subsequent adjuvant radiosurgery, is a feasible option for the management of patients with large petroclival meningiomas, considering both local tumor control and postoperative quality of life.

Morphometric studies of artemia males from different populations of the Altai region

2020 ◽  
pp. 28-38
Author(s):  
L. Vesnina ◽  
G. Lukerina ◽  
T. Ronzhina ◽  
A. Savos’kin ◽  
D. Surkov
Keyword(s):  
Sexual Dimorphism ◽  
Hydrogen Index ◽  
Morphometric Parameters ◽  
Altai Region ◽  
Sexual Structure ◽  
Different Populations ◽  
Artemia Population ◽  
Term Data ◽  
Brine Salinity

The long-term data from morphometric studies of Artemia males from bisexual and parthenogenetic populations from hyperhaline reservoirs of the Altai region (Bolshoe Yarovoe Lake, Maloe Shklo Lake, and the Tanatar Lakes system) is analyzed in this paper. The description of signs of sexual dimorphism and sexual structure in different populations is given. The influence of brine salinity and hydrogen index on morphometric parameters of males was analyzed. There are differences in the sexual structure of the Artemia population: in the lakes Maloe Shklo and the thanatar system, the populations are bisexual (the share of males is 28.5 — 75.0 %), in the lake Bolshoe yarovoe — parthenogenetic (the share of males on average does not exceed 3 %). At the same time, sexual dimorphism is typical for both types of populations: females are larger than males, males have a larger head (the distance between the eyes is greater by 15.5 %, the diameter of the eye is 26.1 %, the length of the antenna is 22.3 %) and a larger number of bristles (36.1 %). The greatest variability is observed in the parameters of the Furka structure associated with the salinity of water by feedback and the pH — line indicator. Significant differences between the samples of males were revealed. The largest number of significant differences in morphometric indicators was found between samples of males from bisexual populations (lake thanatar and lake Maloe Shklo), the smallest — between males from the parthenogenetic population of lake Bolshoe yarovoe and males from lake Maloe Shklo.

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