scholarly journals A Comparison of Systematic Quadrat and Capture-Mark-Recapture Sampling Designs for Assessing Freshwater Mussel Populations

Diversity ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 127
Author(s):  
Caitlin S. Carey ◽  
Jess W. Jones ◽  
Robert S. Butler ◽  
Marcella J. Kelly ◽  
Eric M. Hallerman
Keyword(s):  
Substrate Surface ◽  
Relative Effectiveness ◽  
Freshwater Mussel ◽  
Apparent Survival ◽  
Mark Recapture ◽  
Study Objective ◽  
Quadrat Sampling ◽  
Naturally Occurring ◽  
Clinch River ◽  
Study Species

Our study objective was to compare the relative effectiveness and efficiency of quadrat and capture-mark-recapture (CMR) sampling designs for monitoring mussels. We collected data on a recently reintroduced population of federally endangered Epioblasma capsaeformis and two nonlisted, naturally occurring species—Actinonaias pectorosa and Medionidus conradicus—in the Upper Clinch River, Virginia, over two years using systematic quadrat and CMR sampling. Both sampling approaches produced similar estimates of abundance; however, precision of estimates varied between approaches, years, and among species, and further, quadrat sampling efficiency of mussels detectable on the substrate surface varied among species. CMR modeling revealed that capture probabilities for all three study species varied by time and were positively associated with shell length, that E. capsaeformis detection was influenced by sex, and that year-to-year apparent survival was high (>96%) for reintroduced E. capsaeformis. We recommend that monitoring projects use systematic quadrat sampling when the objective is to estimate and detect trends in abundance for species of moderate to high densities (>0.2/m2), whereas a CMR component should be incorporated when objectives include assessing reintroduced populations, obtaining reliable estimates of survival and recruitment, or producing unbiased population estimates for species of low to moderate densities (≤0.2/m2).

Longitudinal distribution of applied calcium, and of naturally occurring calcium, magnesium, and potassium, in Merton apple fruits

1973 ◽  
Vol 24 (3) ◽  
pp. 363 ◽  
Author(s):  
TL Lewis ◽  
D Martin
Keyword(s):  
Calcium Chloride ◽  
Chloride Solution ◽  
Relative Effectiveness ◽  
Calcium Chloride Solution ◽  
Magnesium Concentration ◽  
Longitudinal Distribution ◽  
Time Of Application ◽  
Naturally Occurring ◽  
Bitter Pit ◽  
Apple Fruits

When 45Ca-labelled calcium chloride solution was applied to the skin of young developing Merton apple fruits, activity in the cortex at maturity was highest in the calyx end region where bitter pit lesions most commonly develop. Fruit age at time of application affected the amount of labelled calcium absorbed but not its longitudinal distribution. Following branch injection of labelled calcium chloride solution 8 weeks before harvest, activity in mature fruits was found mostly in the stem end. Leaves and buds accounted for 95% of the recovered activity, and the fruits for 5%, of which about one-quarter was in the calyx half. The same distribution pattern was found following injection of labelled calcium chloride solution into the fruit stem. The concentration of naturally occurring calcium in the cortex of the mature fruit declined steadily from stem end to calyx end. On the other hand, the magnesium concentration was lowest near the stem end and highest at the calyx end. The potassium concentration remained fairly constant along most of the length of the fruit, with a small increase at each end. The findings are discussed with regard to the longitudinal gradient in bitter pit susceptibility within apple fruits, and to the relative effectiveness of tree sprays of calcium, as compared with soil applications, in the control of the disorder. Results suggest that calcium does not have a trace element role in the control of bitter pit.

scholarly journals Apparent survival estimation from continuous mark-recapture/resighting data

2013 ◽  
Vol 4 (9) ◽  
pp. 846-853 ◽  
Author(s):  
Andrew B. Barbour ◽  
José M. Ponciano ◽  
Kai Lorenzen
Keyword(s):  
Apparent Survival ◽  
Mark Recapture ◽  
Survival Estimation

scholarly journals Estimating apparent survival of sub-adult and adult white sharks (Carcharodon carcharias) in central California using mark-recapture methods

2015 ◽  
Vol 2 ◽  
Author(s):  
Paul E. Kanive ◽  
Jay J. Rotella ◽  
Salvador J. Jorgensen ◽  
Taylor K. Chapple ◽  
Scot D. Anderson ◽  
...  
Keyword(s):  
Apparent Survival ◽  
Carcharodon Carcharias ◽  
Mark Recapture ◽  
Central California

scholarly journals Age-specific survival in an English Twite population.

2021 ◽  
Author(s):  
Ismini Gkourtsouli-Antoniadou ◽  
Steven R. Ewing ◽  
George Hudson ◽  
Michael A. Pearson ◽  
Julia Schroeder ◽  
...  
Keyword(s):  
Habitat Degradation ◽  
Survival Rates ◽  
Bird Species ◽  
Small Population ◽  
Juvenile Survival ◽  
Apparent Survival ◽  
Mark Recapture ◽  
The Uk ◽  
Rule Out

Like many bird species associated with agricultural habitats in the UK, the Twite Linaria flavirostris has undergone severe declines over recent decades due to habitat degradation, with populations in England, Wales and Ireland now restricted to a few small pockets. However, the demographic drivers of these declines are still largely unresolved. We estimated the survival of Twite from a small population at the southernmost edge of the English range in Derbyshire using capture-mark-recapture data from 2016–2019. Annual apparent survival for juveniles (0.14–0.34) was lower than for adults (0.29–0.56) and less than that of other Cardueline finches. Our results suggest that low juvenile survival may be one demographic driver underpinning the recent decline of the Derbyshire Twite population, although we also cannot rule out the possibility that differences in emigration of juveniles and adults from the population also contribute to the observed age-specific apparent survival rates.

Integrating acoustic telemetry into mark–recapture models to improve the precision of apparent survival and abundance estimates

Oecologia ◽  
2015 ◽  
Vol 178 (3) ◽  
pp. 761-772 ◽  
Author(s):  
Christine L. Dudgeon ◽  
Kenneth H. Pollock ◽  
J. Matias Braccini ◽  
Jayson M. Semmens ◽  
Adam Barnett
Keyword(s):  
Acoustic Telemetry ◽  
Apparent Survival ◽  
Mark Recapture ◽  
Abundance Estimates

Surviving a sea-change: survival of southern rock lobster (Jasus edwardsii) translocated to a site of fast growth

2009 ◽  
Vol 66 (4) ◽  
pp. 656-664 ◽  
Author(s):  
Bridget S. Green ◽  
Caleb Gardner
Keyword(s):  
Release Site ◽  
Fast Growth ◽  
Rock Lobster ◽  
Apparent Survival ◽  
Mark Recapture ◽  
Jasus Edwardsii ◽  
Potential Sources ◽  
Parsimonious Models ◽  
A Site ◽  
Slow Growing

Abstract Green, B. S., and Gardner, C. 2009. Surviving a sea-change: survival of southern rock lobster (Jasus edwardsii) translocated to a site of fast growth. – ICES Journal of Marine Science, 66: 656–664. In an experiment aimed at increasing the yield and value of the fishery for southern rock lobster (Jasus edwardsii), 1998 pale and slow-growing lobsters were translocated to sites where lobsters grow faster naturally and develop higher value market traits. Survival of lobsters in their new habitat was critical to the viability of this experiment. To estimate survival, the release site was surveyed every 1–3 months for 2 years. Apparent survival of translocated lobsters was compared with survival of resident lobsters tagged in a similar period using Cormack–Jolly–Seber modelling on mark–recapture data. Lobster survival was not influenced by size, gender, or origin (translocated or resident) alone. The four most parsimonious models suggested slightly lower apparent survival in translocated lobsters immediately after release compared with all other lobsters, but support for these models was weak (∑QAICc weights 62%). The differences in apparent survival were not likely to be significant because of large variance when averaged over all the models. Apparent survival of newly released translocated lobsters was 92% (72–98, 95% CI) compared with 97% (95–98, 95% CI) for all other lobsters. Potential sources of differences in survival are movement from the release site or greater predation on pale lobsters. Losses of lobster through release mortality were low and unlikely to influence the feasibility of translocation as a tool to enhance the value of the fishery, although it would be prudent to include 5% mortality of translocated lobsters in future models of translocation feasibility.

Estimating the density of free-ranging wild horses in rugged gorges using a photographic mark - recapture technique

2009 ◽  
Vol 36 (5) ◽  
pp. 361 ◽  
Author(s):  
Karl Vernes ◽  
Melissa Freeman ◽  
Brad Nesbitt
Keyword(s):  
Large Mammals ◽  
Estimation Model ◽  
Density Estimates ◽  
Mark Recapture ◽  
South Wales ◽  
North Eastern ◽  
Line Transects ◽  
Landscape Scales ◽  
Free Ranging ◽  
Study Species

Estimating the density of large, feral species such as wild horses at landscape scales can present a logistical hurdle for wildlife managers attempting to set density-based management targets. We undertook aerial surveys of wild horses by using a helicopter in Guy Fawkes River National Park in north-eastern New South Wales across 3 years to determine whether meaningful density estimates could be obtained efficiently by a mark–recapture technique based on recognition of individual horses. Horse groups photographed from the air on the first of two surveys conducted each year were ‘marked’ on the basis of a unique combination of colours and natural markings, and ‘recaptured’ if they were photographed and identified on the second survey. Population size was estimated with the program MARK using a range of population estimators; however, because horses appeared to be evading detection on the second survey of each year, we chose a final estimation model that accounted for detection shyness in the study species. In 2005, the density estimate was 3.8 horses per km2 (upper and lower 95% CL = 3.5–5.7 horses per km2). Following horse control in these catchments, the estimate in 2007 was 2.3 horses per km2 (upper and lower 95% CL = 2.1–3.4 horses per km2), and this change in density can be accounted for by the known number of horses removed from the survey area between survey periods. Overall, the technique proved useful for estimating densities of wild horses in deeply dissected gorge country where other estimation techniques (such as line transects) are not practical; however, low recapture rates in one of the years of the study shows that the technique may not always be applicable. Our technique should also be suitable for surveying other large mammals with broad ranges in open environments, provided recognition of individuals from unique marks is possible.

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