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.

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

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.

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

Long-term in vitro Storage Technique of Valuable Birch Genotypes and Plant Production on its Basis

2019 ◽  
pp. 57-67
Author(s):  
T.M. Tabatskaya ◽  
N.I. Vnukova
Keyword(s):  
Plant Production ◽  
High Survival ◽  
Ex Vitro ◽  
Regenerative Capacity ◽  
In Vitro Storage ◽  
Interspecific Differences ◽  
Regenerated Plants ◽  
Growing Conditions

A technique for the long-term (up to 27 years) in vitro storage of valuable birch genotypes under normal (25 °C, 2.0 klx, 16-h day and 8-h night) and low temperature (4 °C, 0.5 klx, 6-h day and 18-h night) growing conditions on hormone-free media has been described. The study explored for the first time the influence of different strategies to store the clones of Betula pubescens and B. pendula var. сarelica (6 genotypes) on the regenerative capacity of collection samples, adaptive potential of regenerated plants and plant production by the in vitro and ex vitro techniques. It was established that both storage strategies provided a persistently high survival rate (82-100%) and regenerative capacity of in vitro shoots (the multiplication coefficient of 4.2-6.3 and rhizogenic activity of 90-100%). The clones retained their characteristics of height growth under the in vitro and ex vitro conditions, and demonstrated intraclonal homogeneity and lack of signs of somaclonal variability. The plants showed substantial interspecific differences at the stage of multiplication and transfer to the greenhouse. The highest percentage of acclimated plants (75-98% depending on the clone genotype) was obtained after planting of micro plants straight in the greenhouse, which simplified the technology and made plant production less costly. long-term in vitro storage, birch, species, genotype, micropropagation, ex vitro adaptation, plant material

scholarly journals Green morays (Gymnothorax funebris) have sedentary ways in mangrove bays, but also ontogenetic forays to reef enclaves

2021 ◽  
Author(s):  
Matthew S. Kendall ◽  
Laughlin Siceloff ◽  
Ashley Ruffo ◽  
Arliss Winship ◽  
Mark E. Monaco
Keyword(s):  
Home Range ◽  
Site Fidelity ◽  
Home Range Size ◽  
Range Size ◽  
Caribbean Region ◽  
History Of ◽  
High Site ◽  
Single Night ◽  
Exploratory Movements ◽  
Moray Eel

AbstractSurprisingly, little is known about basic life history of the largest moray eel species in the Caribbean region, the green moray eel (Gymnothorax funebris). Sixteen eels were captured from the mangrove fringe in multiple bays on St. Croix, USVI, implanted with coded acoustic transmitters, and their movements were tracked for up to 11 months using an array of 37 stationary acoustic receivers. They exhibited high site fidelity in the bays during their residence, using the same general parts of individual bays and did not switch bays except for one individual. There was no relationship between eel size (mean TL = 83 cm, range = 54–126 cm) and home range size (mean area of 95% KUD = 5.8 ha ± 0.7 SE). Most individuals were more frequently detected at night than during the day suggesting greater nocturnal activity. Several of the larger eels (mean TL = 93 cm ± 5.9 SE) showed clear and permanent emigration tracks out of the mangrove estuary to coral reef habitats offshore. For some individuals, these habitat shifts were preceded by exploratory movements away from the eel’s typical home range the night before emigration. All final emigration events took place nocturnally, happened during a single night, and occurred during months from December to May. Mean emigration speed was 3.4 km/h. This study is the first documentation of an ontogenetic habitat shift in moray eels, as well as the first determination of home range size for this species and their site fidelity in mangrove habitats.

scholarly journals Movement syndromes of a Neotropical frugivorous bat inhabiting heterogeneous landscapes in Brazil

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Patricia Kerches-Rogeri ◽  
Danielle Leal Ramos ◽  
Jukka Siren ◽  
Beatriz de Oliveira Teles ◽  
Rafael Souza Cruz Alves ◽  
...  
Keyword(s):  
Site Fidelity ◽  
Animal Movement ◽  
Radio Telemetry ◽  
Food Resource ◽  
Movement Behavior ◽  
Movement Activity ◽  
Landscape Features ◽  
Heterogeneous Landscapes ◽  
Movement Data ◽  
High Site

Abstract Background There is growing evidence that individuals within populations can vary in both habitat use and movement behavior, but it is still not clear how these two relate to each other. The aim of this study was to test if and how individual bats in a Stunira lilium population differ in their movement activity and preferences for landscape features in a correlated manner. Methods We collected data on movements of 27 individuals using radio telemetry. We fitted a heterogeneous-space diffusion model to the movement data in order to evaluate signals of movement variation among individuals. Results S. lilium individuals generally preferred open habitat with Solanum fruits, regularly switched between forest and open areas, and showed high site fidelity. Movement variation among individuals could be summarized in four movement syndromes: (1) average individuals, (2) forest specialists, (3) explorers which prefer Piper, and (4) open area specialists which prefer Solanum and Cecropia. Conclusions Individual preferences for landscape features plus food resource and movement activity were correlated, resulting in different movement syndromes. Individual variation in preferences for landscape elements and food resources highlight the importance of incorporating explicitly the interaction between landscape structure and individual heterogeneity in descriptions of animal movement.

Infiltration of de-icing road salts in aquifers: the Trois-Rivières-Ouest case, Quebec, Canada

1989 ◽  
Vol 26 (11) ◽  
pp. 2186-2193 ◽  
Author(s):  
Jacques Locat ◽  
Pierre Gélinas
Keyword(s):  
Unsaturated Zone ◽  
Chloride Concentration ◽  
Late Summer ◽  
Linear Source ◽  
Pumping Wells ◽  
Road Salts ◽  
Hydrogeological Investigation ◽  
Spring Snowmelt ◽  
Chloride Concentrations

The results of an extensive hydrogeological investigation of the effects of de-icing road salts on Highway 55 near Trois-Rivières-Ouest indicate that a salt lens with chloride concentrations exceeding 800 mg/L exists below the highway. Maximum chloride concentration at the nearby pumping wells, not exceeding 140 mg/L, is reached only in late summer, whereas the maximum chloride infiltration follows the spring snowmelt. About 1 year's worth of road salts is retained in the unsaturated zone. The salt lens, in the upper part of the aquifer beneath the highway, has developed to a thickness of 8 m and a width of 400 m and constitutes a linear source of salts for the aquifer. The shape of this lens is distorted by the action of the pumping wells, and the lens is partly depleted by the end of the summer. Because of the particular characteristics of the aquifer at the site studied and the exploitation methods, no long-term threat to the water quality is foreseen.

scholarly journals Long-term individual foraging site fidelity—why some gannets don't change their spots

Ecology ◽  
2015 ◽  
Vol 96 (11) ◽  
pp. 3058-3074 ◽  
Author(s):  
Ewan D. Wakefield ◽  
Ian R. Cleasby ◽  
Stuart Bearhop ◽  
Thomas W. Bodey ◽  
Rachel D. Davies ◽  
...  
Keyword(s):  
Site Fidelity ◽  
Foraging Site

scholarly journals Long-term effects of plant spacing on the growth and morphometry of Bertholletia excelsa

2021 ◽  
Vol 51 (3) ◽  
pp. 181-190
Author(s):  
Rafael Gonçalves de OLIVEIRA ◽  
Alex Soares de SOUZA ◽  
Victor Alexandre Hardt Ferreira dos SANTOS ◽  
Roberval Monteiro Bezerra de LIMA ◽  
Marciel José FERREIRA
Keyword(s):  
Average Diameter ◽  
Fruit Production ◽  
High Survival ◽  
Plant Spacing ◽  
Long Term Effects ◽  
Bertholletia Excelsa ◽  
Tree Form ◽  
Tree Crowns ◽  
Growth Space

ABSTRACT Plant spacing is a potential driver of tree form and yield in forest plantations. However, its effects on the productivity of tree plantations in the Amazon are still little known. This study examined the effects of six spacing regimes (3 x 4, 4 x 4, 4 x 5, 5 x 5, 5 x 6, and 6 x 6 m) on the growth and morphometry of a 20-year-old plantation of Bertholletia excelsa. We observed high, spacing-independent survival (> 70%). For timber production purposes, intermediate and two large spacing regimes tended to higher values of yield components, mainly diameter, biomass, and volume, although some did not differ significantly from the smallest spacing. One of the intermediate spacings (5 x 5 m) tended to higher commercial height. Tree crowns tended to be wider and longer in the larger spacings, which indicates the potential of these regimes for fruit production. Tree crowns exceeded the vital growth space in all spacing regimes, which suggests the need for thinning before the age of 20 years in all spacings to reduce intraspecific competition and increase yield. We estimated that a density of 84 remaining trees per hectare would be necessary to reach an average diameter of 40 cm at the age of 20 years. Thus, B. excelsa had high survival in the tested range of spacing regimes, while the intermediate and the largest spacing regimes led to better tree growth and morphometry.

scholarly journals Changes in historical typhoid transmission across 16 U.S. cities, 1889-1931: Quantifying the impact of investments in water and sewer infrastructures

2019 ◽  
Author(s):  
Maile T. Phillips ◽  
Katharine A. Owers ◽  
Bryan T. Grenfell ◽  
Virginia E. Pitzer
Keyword(s):  
Late Summer ◽  
Water Source ◽  
Developed Countries ◽  
The United States ◽  
Water And Sanitation ◽  
Sewer Systems ◽  
Early Fall ◽  
Sanitation Systems ◽  
The Impact

ABSTRACTBackgroundInvestments in water and sanitation systems are believed to have led to the decline in typhoid fever in developed countries, such that most cases now occur in regions lacking adequate clean water and sanitation. Exploring seasonal and long-term patterns in historical typhoid mortality in the United States can offer deeper understanding of disease drivers.MethodsWe fit modified Time-series Susceptible-Infectious-Recovered models to city-level weekly mortality counts to estimate seasonal and long-term typhoid transmission. We examined seasonal transmission separately by city and aggregated by water source. We fit regression models to measure associations between long-term transmission and financial investments in water and sewer systems.ResultsTyphoid transmission peaked in late summer/early fall. Seasonality varied by water source, with the greatest variation occurring in cities with reservoirs. Historical $1 per capita ($25.80 in 2017) investments in construction and operation of water and sewer systems were associated with 8-53% decreases in typhoid transmission, while $1 increases in total value or debt accrued to maintain them were associated with 4-7% decreases.ConclusionOur findings aid in the understanding of typhoid transmission dynamics and potential impacts of water and sanitation improvements, and can inform cost-effectiveness analyses of interventions to reduce the typhoid burden.

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