scholarly journals Short-Term Survival Estimates of the New Zealand Mud Snail (Potamopyrgus Antipodarium) in Polecat Creek

2011 ◽  
Vol 33 ◽  
pp. 81-83
Author(s):  
Teresa Tibbets
Keyword(s):  
Invasive Species ◽  
Survival Data ◽  
Invasion Biology ◽  
Term Survival ◽  
Population Growth Rates ◽  
Mud Snail ◽  
Greater Yellowstone Area ◽  
Introduced Range ◽  
New Zealand Mud Snail

Invasive species are one of the primary threats to native biodiversity worldwide (Mack et al. 2000). Two main goals of invasion biology are to identify the mechanisms that determine which introduced species become invasive, or reach pest status, and which systems are susceptible to invasion (Heger and Trepl 2003). Therefore, it is vital to understand how invasive species sustain positive population growth rates in their introduced range. In this study, I estimated in situ survival of the invasive mud snail, Potamopyrgus antipodarium, in order to assess the population viability and life history patterns of this species in the Greater Yellowstone Area. The mean percent survival of P. antipodarium was 86% during the two-week study period. The field survival data is currently being used to construct a demographic population model of how P. antipodarum populations under different environmental conditions.

scholarly journals How Does Nutrient Availability Affect the Population Dynamics of the Invasive New Zealand Mud Snail (Potamopyrgus Antipodarum)?

2009 ◽  
Vol 32 ◽  
pp. 123-124
Author(s):  
Teresa Tibbets
Keyword(s):  
New Zealand ◽  
Population Growth ◽  
Invasion Biology ◽  
Potamopyrgus Antipodarum ◽  
Trophic Levels ◽  
Invasion Success ◽  
Population Growth Rates ◽  
Mud Snail ◽  
Introduced Range ◽  
New Zealand Mud Snail

A primary goal of invasion biology is to predict which introduced species become invasive and which systems are susceptible to invasion. Therefore it is vital to understand how invasive species sustain positive population growth rates in their introduced range and what environmental factors control population growth. The New Zealand mud snail (Potamopyrgus antipodarum) (Figure 1.) has spread throughout Europe, Australia, and North America, and has reached pest densities in many streams in the Greater Yellowstone Area (GYA) since their introduction in the 1980‘s. High rates of growth and secondary production have been documented for mud snails in its introduced range in the GYA, as have evidence of negative interactions between mud snails and native macroinvertebrates and higher trophic levels. However, little is known about how the availability of nutrients affects the invasion success of mud snails.

scholarly journals Ten-Years Later: Long-Term Analyses of the Abundance and Biomass of the Non-Native New Zealand Mud Snail and Native Invertebrate Communities in the Greater Yellowstone Area

2011 ◽  
Vol 34 ◽  
pp. 147-150
Author(s):  
Teresa Tibbets
Keyword(s):  
Invasive Species ◽  
New Zealand ◽  
National Park ◽  
Macroinvertebrate Community ◽  
Long Term Effects ◽  
Mud Snail ◽  
Greater Yellowstone Area ◽  
Greater Yellowstone ◽  
New Zealand Mud Snail

Invasive species are one of the top two threats to native biodiversity worldwide (Mack et al. 2000). A primary goal of invasion biology is to predict which introduced species become invasive, or reach pest status, and which systems are susceptible to invasion (Heger and Trepl 2003). In order to complete this goal, it is vital to understand long-term dynamics of invasive species populations and their interactions with native communities in their introduced range. Most studies of invasions by non-native species are not extensive enough to determine long-term effects on the native systems (Strayer 2010). The first objective of this study is to determine the long-term abundance and biomass of the New Zealand mud snail, (Potamopyrgus antipodarum), in the Greater Yellowstone Area (GYA). The second objective is to analyze the long-term effects of P. antipodarum on the biomass, abundance, and taxon diversity of native benthic invertebrate assemblages in the GYA. The ten-year span of data available for P. antipodarum and the native macroinvertebrate communities at Lower Polecat Creek in Grand Teton National Park and the Gibbon and Firehole Rivers in Yellowstone National Park provide a unique opportunity to study the macroinvertebrate community succession over time. Data from the proposed macroinvertebrate community survey in the summer of 2011 will be compiled with previous surveys from 2001-2009 to evaluate the long-term changes in the macroinvertebrate community at Polecat Creek and the Gibbon and Firehole Rivers.

scholarly journals Matching a snail’s pace: Successful use of environmental DNA techniques to detect early stages of invasion by the destructive New Zealand mud snail

2020 ◽  
Author(s):  
James D. Woodell ◽  
Maurine Neiman ◽  
Edward P. Levri
Keyword(s):  
Invasive Species ◽  
New Zealand ◽  
Low Cost ◽  
Environmental Dna ◽  
Invasive Population ◽  
Effective Response ◽  
Mud Snail ◽  
Species Specific ◽  
New Zealand Mud Snail ◽  
And Control

ABSTRACTEarly detection of invasive species allows for a more rapid and effective response. Restoration of the native ecosystem after an invasive population has established is expensive and difficult but more likely to succeed when invasions are detected early in the invasion process. Containment efforts to prevent the spread of known invasions also benefit from earlier knowledge of invaded sites. Environmental DNA (eDNA) techniques have emerged as a tool that can identify invasive species at a distinctly earlier time point than traditional methods of detection. Due to expected range expansion in eastern North America, we focus on the destructive New Zealand Mud Snail Potamopyrgus antipodarum (NZMS) invasion. We collected water samples from eight sites that prior evidence indicated were not yet invaded by the NZMS. After filtering these samples to collect eDNA, we used a species-specific probe with qPCR to identify NZMS eDNA. We found evidence for NZMS invasion at five of the eight sites, with later physical confirmation of mud snails at one of these sites. This study is the first example of successful detection of a previously unidentified invasive population of NZMS, setting the stage for further monitoring of at-risk sites to detect and control new invasions of this destructive snail. This study also shows potential opportunities for invasion monitoring offered by using low-cost efforts and methods that are adaptable for citizen science.

scholarly journals Using in-situ environmental DNA sampling to detect the invasive New Zealand Mud Snail (Potamopyrgus antipodarum) in freshwaters

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11835
Author(s):  
Jake J. Ponce ◽  
Ivan Arismendi ◽  
Austen Thomas
Keyword(s):  
Invasive Species ◽  
New Zealand ◽  
Environmental Dna ◽  
Cost Effective ◽  
Potamopyrgus Antipodarum ◽  
Real Time Quantitative Pcr ◽  
Mud Snail ◽  
Rapid Responses ◽  
Detection Approach ◽  
New Zealand Mud Snail

Environmental DNA (eDNA) detection of aquatic invasive species is currently at the forefront of aquatic conservation efforts because the methodology provides a cost effective and sensitive means to detect animals at low densities. Developments in eDNA technologies have improved detection probabilities for rare, indicator, and invasive species over the past decade. However, standard lab analysis can take days or weeks before results are available and is prohibitive when rapid management decisions are required for mitigation. Here, we investigated the performance of a real-time quantitative PCR system for on-site eDNA detection of New Zealand mud snails (Potamopyrgus antipodarum). Six sites in western Washington, USA were sampled using the rapid eDNA technique and traditional methods, with five samples per site. On-site eDNA detection of mud snails resulted in a 10% increase in positive sites (16/30 = 53% positive) relative to visual surveys (13/30 = 43% positive). In addition, positive associations were observed between mud snail eDNA concentration (eDNA copies per reaction) and the number of mud snail individuals at each site (R2 = 0.78). We show that the rapid on-site eDNA technology can be effective for detection and quantification of New Zealand mud snails in freshwaters. This on-site eDNA detection approach could possibly be used to initiate management protocols that allow for more rapid responses during the onset of biological invasions.

scholarly journals Grazing effects of the Invasive Mudsnail, Potamopyrgus antipodarum and Two Native Invertebrates

2006 ◽  
Vol 30 ◽  
pp. 105-109
Author(s):  
Amy Krist
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
Rapid Evolution ◽  
Potamopyrgus Antipodarum ◽  
Ecological Impacts ◽  
Greater Yellowstone Area ◽  
Greater Yellowstone ◽  
Or Gene ◽  
New Zealand Mud Snail ◽  
Evolutionary Consequences

Although many efforts are being made to address ecological impacts of invasive species, very little effort has been made to address the evolutionary impacts of biological invasions (Sakai etal. 2001, Cox 2004). Yet these impacts are likely to be widespread; invasive species have been shown to alter patterns of natural selection or gene flow (Parker et al. 1999), and many of the best examples of rapid evolution involve invasive species interacting with native species (Reznick and Ghalambor 2001, Strauss et al. 2006). Hence, I am addressing both the ecological and the potential evolutionary consequences of the invasive New Zealand mud snail, Potamopyrgus antipodarum on native benthic macroinvertebrates in the Greater Yellowstone Area (GYA).

scholarly journals Is It Definitely Clear That Long-Term Survival after Breast Cancer Surgery Is Not Affected by Anaesthetics?

Cancers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 3390
Author(s):  
Mats Enlund
Keyword(s):  
Breast Cancer ◽  
Survival Data ◽  
Retrospective Studies ◽  
Breast Cancer Surgery ◽  
Breast Cancer Patients ◽  
Term Survival ◽  
Long Term Survival ◽  
Significant Difference ◽  
One Year

Retrospective studies indicate that cancer survival may be affected by the anaesthetic technique. Propofol seems to be a better choice than volatile anaesthetics, such as sevoflurane. The first two retrospective studies suggested better long-term survival with propofol, but not for breast cancer. Subsequent retrospective studies from Asia indicated the same. When data from seven Swedish hospitals were analysed, including 6305 breast cancer patients, different analyses gave different results, from a non-significant difference in survival to a remarkably large difference in favour of propofol, an illustration of the innate weakness in the retrospective design. The largest randomised clinical trial, registered on clinicaltrial.gov, with survival as an outcome is the Cancer and Anesthesia study. Patients are here randomised to propofol or sevoflurane. The inclusion of patients with breast cancer was completed in autumn 2017. Delayed by the pandemic, one-year survival data for the cohort were presented in November 2020. Due to the extremely good short-term survival for breast cancer, one-year survival is of less interest for this disease. As the inclusions took almost five years, there was also a trend to observe. Unsurprisingly, no difference was found in one-year survival between the two groups, and the trend indicated no difference either.

scholarly journals Encapsulated Papillary Carcinoma of the Breast: Imaging Features with Histopathologic Correlation

2020 ◽  
Vol 2 (6) ◽  
pp. 590-597
Author(s):  
Sarah E Bonnet ◽  
Gloria J Carter ◽  
Wendie A Berg
Keyword(s):  
Papillary Carcinoma ◽  
Core Needle Biopsy ◽  
Needle Biopsy ◽  
Breast Imaging ◽  
Ductal Carcinoma ◽  
Imaging Features ◽  
Term Survival ◽  
Core Needle ◽  
Cystic Component

Abstract Encapsulated papillary carcinoma (EPC) is a rare, clinically indolent breast malignancy most common in postmenopausal women. Absence of myoepithelial cells at the periphery is a characteristic feature. Mammographically, EPC typically presents as a mostly circumscribed, noncalcified, dense mass that can have focally indistinct margins when there is associated frank invasive carcinoma. Ultrasound shows a circumscribed solid or complex cystic and solid mass, and occasional hemorrhage in the cystic component may produce a fluid-debris level; the solid components typically show intense washout enhancement on MRI. Color Doppler may demonstrate a prominent vascular pedicle and blood flow within solid papillary fronds. Encapsulated papillary carcinoma can exist in pure form; however, EPC is often associated with conventional ductal carcinoma in-situ and/or invasive ductal carcinoma, no special type. Adjacent in-situ and invasive disease may be only focally present at the periphery of EPC and potentially unsampled at core-needle biopsy. In order to facilitate diagnosis, the mass wall should be included on core-needle biopsy, which will show absence of myoepithelial markers. Staging and prognosis are determined by any associated frankly invasive component, with usually excellent long-term survival and rare distant metastases.

Sign in / Sign up

Export Citation Format

Share Document