scholarly journals Radiotagging a long-distance migratory characid fish: reproduction after surgery, tag losses, and effects in weight

2021 ◽  
Vol 19 (2) ◽  
Author(s):  
Alexandre Peressin ◽  
João de Magalhães Lopes ◽  
Alessandra Gomes Bedore ◽  
Carlos Bernardo Mascarenhas Alves ◽  
Ivo Gavião Prado ◽  
...  
Keyword(s):  
Invasive Procedure ◽  
Reproductive Capacity ◽  
Migratory Fish ◽  
Fish Reproduction ◽  
Long Distance ◽  
Initial Weight Loss ◽  
Sample Number ◽  
Neotropical Fishes ◽  
Weight Variation ◽  
Species Specific

Abstract Although biotelemetry studies bring useful information, tagging is a highly invasive procedure. For this reason, we assess if intracoelomic tagging alters survivorship, weight gain and/or reproductive capacity of a neotropical migratory fish. In August 2016, 60 fish were equally and randomly distributed among 3 treatments: Control (anesthesia), sham surgery (anesthesia and surgery), and true surgery (anesthesia, surgery and tagging). Surveys for weight and tag expulsion were performed periodically from surgery through spawning (November/2016), with a final survey occurring in May/2017. Mortality was higher in true surgery (25% died) and for males. Twenty percent expelled tags, and initial weight loss followed by gain were verified for all treatments. Females of all treatments spawned, and fecundity and fertility were not different. Then, future studies should consider the losses due to death and tag expulsion when defining the sample number. We also encourage further investigations about differences in mortality between sex and weight variation, as well as any other factor that leads to increase in mortality. This is the first study that investigated tagging effects in reproduction of neotropical fishes, and since the methods and tags used are not species-specific, we infer that similar effects could occur in other species.

The Benefits of Biotreatment for Reducing the Effects of Pulp and Paper Mill Effluents on Fish Reproduction in Laboratory Tests

2008 ◽  
Vol 43 (2-3) ◽  
pp. 161-171 ◽  
Author(s):  
Pierre Martel ◽  
Tibor Kovacs ◽  
Virginie Bérubé
Keyword(s):  
Laboratory Tests ◽  
Egg Production ◽  
Pimephales Promelas ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Reproductive Capacity ◽  
Fish Reproduction ◽  
Pulp And Paper Mill ◽  
Paper Mill Effluents ◽  
Gonad Size

Abstract Pulp and paper mill effluents have been reported to cause changes in reproductive indicators of fish in laboratory and field studies. These changes include reduced egg production and gonad size, and altered hormone levels and expression of secondary sex characteristics. We examined the performance of biotreatment plants for their potential in abating effects of pulp and paper mill effluents on fish reproduction under laboratory conditions. A bleached kraft mill effluent (BKME) treated in an aerated lagoon and a thermomechanical pulp mill effluent (TMPE) treated by aerobic sludge in a sequential batch reactor were selected for study. Mature fathead minnows (Pimephales promelas) were exposed to effluents before and after biotreatment under continuous renewal conditions for 21 days. Egg production was monitored daily, while morphometric parameters (length, weight, gonad size), secondary sexual characteristics, and steroid hormone and vitellogenin levels were measured at the end of the effluent exposure. The effluent from both mills before biotreatment impaired the reproductive capacity of minnows (egg production) at concentrations of 10 and 20% vol/vol, but not at 2% vol/vol. Exposure to biotreated effluents from both mills at concentrations of 2, 10, 20, and 40% vol/vol caused no significant differences in overall reproductive capacity of minnows as compared with controls. These results indicate that biotreatment can significantly improve the quality of a BKME and an effluent from a TMP mill with respect to the reproductive capacity of fish as determined in laboratory tests.

scholarly journals Migratory orientation in a narrow avian hybrid zone

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3201 ◽  
Author(s):  
David P.L. Toews ◽  
Kira E. Delmore ◽  
Matthew M. Osmond ◽  
Philip D. Taylor ◽  
Darren E. Irwin
Keyword(s):  
Hybrid Zone ◽  
Genetic Background ◽  
Migratory Restlessness ◽  
Long Distance ◽  
Mountain Valley ◽  
Migratory Orientation ◽  
Isotopic Studies ◽  
Migratory Routes ◽  
Species Specific ◽  
Migratory Divide

Background Zones of contact between closely related taxa with divergent migratory routes, termed migratory divides, have been suggested as areas where hybrid offspring may have intermediate and inferior migratory routes, resulting in low fitness of hybrids and thereby promoting speciation. In the Rocky Mountains of Canada there is a narrow hybrid zone between Audubon’s and myrtle warblers that is likely maintained by selection against hybrids. Band recoveries and isotopic studies indicate that this hybrid zone broadly corresponds to the location of a possible migratory divide, with Audubon’s warblers migrating south-southwest and myrtle warblers migrating southeast. We tested a key prediction of the migratory divide hypothesis: that genetic background would be predictive of migratory orientation among warblers in the center of the hybrid zone. Methods We recorded fall migratory orientation of wild-caught migrating warblers in the center of the hybrid zone as measured by video-based monitoring of migratory restlessness in circular orientation chambers. We then tested whether there was a relationship between migratory orientation and genetic background, as measured using a set of species-specific diagnostic genetic markers. Results We did not detect a significant association between orientation and genetic background. There was large variation among individuals in orientation direction. Mean orientation was towards the NE, surprising for birds on fall migration, but aligned with the mountain valley in which the study took place. Conclusions Only one other study has directly analyzed migratory orientation among naturally-produced hybrids in a migratory divide. While the other study showed an association between genetic background and orientation, we did not observe such an association in yellow-rumped warblers. We discuss possible reasons, including the possibility of a lack of a strong migratory divide in this hybrid zone and/or methodological limitations that may have prevented accurate measurements of long-distance migratory orientation.

scholarly journals Long-Distance Movement of mRNAs in Plants

Plants ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 731 ◽  
Author(s):  
Chao Xia ◽  
Cankui Zhang
Keyword(s):  
Vascular System ◽  
Physiological Characteristic ◽  
Small Peptides ◽  
Long Distance ◽  
Systemic Signaling ◽  
Long Distance Transport ◽  
Specific Mrnas ◽  
Multiple Species ◽  
Species Specific ◽  
Long Distance Movement

Long-distance transport of information molecules in the vascular tissues could play an important role in regulating plant growth and enabling plants to cope with adverse environments. Various molecules, including hormones, proteins, small peptides and small RNAs have been detected in the vascular system and proved to have systemic signaling functions. Sporadic studies have shown that a number of mRNAs produced in the mature leaves leave their origin cells and move to distal tissues to exert important physiological functions. In the last 3–5 years, multiple heterograft systems have been developed to demonstrate that a large quantity of mRNAs are mobile in plants. Further comparison of the mobile mRNAs identified from these systems showed that the identities of these mRNAs are very diverse. Although species-specific mRNAs may regulate the unique physiological characteristic of the plant, mRNAs with conserved functions across multiple species are worth more effort in identifying universal physiological mechanisms existing in the plant kingdom.

scholarly journals Genetic Control of Mosquitoes: population suppression strategies

2012 ◽  
Vol 54 (5) ◽  
pp. 287-292 ◽  
Author(s):  
André Barretto Bruno Wilke ◽  
Mauro Toledo Marrelli
Keyword(s):  
Genetic Control ◽  
Mosquito Control ◽  
Public Health Problem ◽  
Mass Rearing ◽  
Control Measures ◽  
Reproductive Capacity ◽  
Lethal Gene ◽  
Control Methods ◽  
Species Specific ◽  
Population Suppression

Over the last two decades, morbidity and mortality from malaria and dengue fever among other pathogens are an increasing Public Health problem. The increase in the geographic distribution of vectors is accompanied by the emergence of viruses and diseases in new areas. There are insufficient specific therapeutic drugs available and there are no reliable vaccines for malaria or dengue, although some progress has been achieved, there is still a long way between its development and actual field use. Most mosquito control measures have failed to achieve their goals, mostly because of the mosquito's great reproductive capacity and genomic flexibility. Chemical control is increasingly restricted due to potential human toxicity, mortality in no target organisms, insecticide resistance, and other environmental impacts. Other strategies for mosquito control are desperately needed. The Sterile Insect Technique (SIT) is a species-specific and environmentally benign method for insect population suppression, it is based on mass rearing, radiation mediated sterilization, and release of a large number of male insects. Releasing of Insects carrying a dominant lethal gene (RIDL) offers a solution to many of the drawbacks of traditional SIT that have limited its application in mosquitoes while maintaining its environmentally friendly and species-specific utility. The self-limiting nature of sterile mosquitoes tends to make the issues related to field use of these somewhat less challenging than for self-spreading systems characteristic of population replacement strategies. They also are closer to field use, so might be appropriate to consider first. The prospect of genetic control methods against mosquito vectored human diseases is rapidly becoming a reality, many decisions will need to be made on a national, regional and international level regarding the biosafety, social, cultural and ethical aspects of the use and deployment of these vector control methods.

scholarly journals Marital Satisfaction: An Analysis of Long Distance Marriage Couples

2020 ◽  
Vol 4 (1) ◽  
pp. 64
Author(s):  
Bramana Nanditya Putra ◽  
Afdal Afdal
Keyword(s):  
Marital Satisfaction ◽  
Sampling Technique ◽  
Sample Collection ◽  
Long Distance ◽  
Satisfaction Scale ◽  
Sample Number ◽  
Marital Satisfaction Inventory ◽  
Research Findings ◽  
The Difference ◽  
Husband And Wife

This research aims to describe marital satisfaction of long distance marriage and and the difference marital satisfaction between husband and wife undergoing long-distance marriages(LDM). . This research was a comparative research with a sample number of 45 couples who have LDM. Sample collection withdrawal technique using a purposive sampling technique. This research was measured using a Marital Satisfaction Inventory developed from ENRICH Marital Satisfaction Scale with a few adjustments. The research findings reveal that: (1) marital satisfaction of husband undergoing long-distance marriages is generally in medium category with a percentage of 70.25%, (2) marital satisfaction of wives undergoing LDM is generally in the high category with a percentage of 74.65%, and (3) there is no difference in marital satisfaction between husband and wife undergoing LDM with the value F of 4,940 with probability 0.029 smaller than 0.05.

scholarly journals GAMBARAN PENGETAHUAN DAN SIKAP PRIA PRODUKTIF TERHADAP METODE KONTRASEPSI VASEKTOMI

2018 ◽  
Vol 7 (1) ◽  
pp. 79
Author(s):  
Ariyanto Ariyanto ◽  
Nurfitriani Nurfitriani
Keyword(s):  
Social Factors ◽  
Reproductive Capacity ◽  
Childbearing Age ◽  
Cross Sectional ◽  
Sample Number ◽  
Know How ◽  
The Social ◽  
Minor Surgery ◽  
Cross Sectional Design ◽  
Selection Of

Vasectomy is an alternative method of contraception for men who do not want to have children anymore by undergoing minor surgery to stop male reproductive capacity. The method of this research is quantitative analytical with cross sectional design, sample number of KK 50 samples, sampling using puporsive sampling. Data collection techniques using questionnaires, univariate data analysis. The results showed that the knowledge was 100% did not know the social factors that influence the selection of contraception, 11 respondents (22.0%) did not know what advantage in choosing the method of vasectomy contraception, 18% do not know how many children are allowed to use vasectomy contraception and 16.0 % who do not know the age of husbands who may use vasectomy contraception, productive man attitude there are 36.0% hesitated that vasectomy contraception is a safe and effective birth control for couples of childbearing age, 44.0% hesitant to use vasectomy contraception did not affect subsequent sexual relations, 90.0%  hesitant to use vasectomy contraception is not against religion,  60,0% hesitate contraception vase ktomi may reduce the desire for sexual intercourse (libido), 56.0% doubt the use of vasectomy does not result in men become impotent (not male), and 56.0% hesitant men who became vasectomy acceptors can ejaculate (semen discharge).

scholarly journals Anthropogenic river fragmentation reduces long-term viability of the migratory fish Salminus brasiliensis (Characiformes: Bryconidae) populations

2021 ◽  
Vol 19 (2) ◽  
Author(s):  
Josiane Ribolli ◽  
Evoy Zaniboni-Filho ◽  
Carolina Barros Machado ◽  
Tailise Carolina de Souza Guerreiro ◽  
Patrícia Domingues de Freitas ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Anthropogenic Impacts ◽  
Species Conservation ◽  
Migratory Fish ◽  
Effective Population ◽  
Long Distance ◽  
Management Actions ◽  
Population Structure Analysis ◽  
Salminus Brasiliensis

Abstract Life-history, geographical barriers, and damming can shape the genetic diversity of freshwater migratory fish, which are particularly vulnerable to anthropogenic impacts. We investigated the genetic diversity of Salminus brasiliensis, a long-distance migratory species that is recognized as an important provider of ecosystem services. We implemented microsatellite analyses to assess genetic diversity and simulate future scenarios for evaluating the long-term viability of dammed and non-dammed populations from the Uruguay River. High levels of genetic diversity were detected for all sampled populations. However, effective population sizes were lower in the uppermost river stretches, where the landscape is highly fragmented. Population structure analysis indicated two spatial genetic populations. It is suggested that this genetic structure preserves populations partially isolated by an ancient natural barrier, instead of being a result of the presence of dams. The simulated genetic scenarios indicated that genetic variability of S. brasiliensis populations from upstream dams could collapse over the years, mainly due to the reduction in the number of alleles. Therefore, besides helping to better understand issues related to the influence of dams on the genetic diversity of migratory fish, our results are especially relevant for driving local fishery policies and management actions for the species conservation.

The ecology of bats in south-east Australian forests and potential impacts of forestry practices: a review

1995 ◽  
Vol 2 (4) ◽  
pp. 363 ◽  
Author(s):  
Bradley S. Law
Keyword(s):  
Species Richness ◽  
Radio Telemetry ◽  
Habitat Preferences ◽  
Structural Complexity ◽  
Current Evidence ◽  
Mature Trees ◽  
Long Distance ◽  
Forestry Practices ◽  
High Conservation ◽  
Species Specific

Bats are important contributors to Australia's mammal diversity and are ecologically diverse, feeding on insects, fish, small vertebrates, nectar, pollen and fruit. As such they are likely to play key ecological roles as regulators of invertebrate populations and pollinators of forests. Although somewhat contradictory, current evidence suggest that logging impacts on the species richness and activity of insectivorous bats when forest structural complexity and the number of available roosting hollows are reduced. Inconsistent results concerning impact on species richness stem from methodological problems with bat surveys. "Rare" species are often recorded in low numbers, preventing habitat preferences and disturbance impacts from being determined. Radio-telemetry has demonstrated that roosts in hollows of mature trees are a critical resource for many species of bats due to species specific requirements. However, it is not yet possible to state whether bat populations are directly limited by the availability of hollows in areas where a mosaic of logged and unlogged forest exists. Although data on foraging areas are extremely limited, some species appear to be flexible, capable of flying across open areas and exploiting those rich in invertebrates. Some species (e.g., Vespadelus) show a high degree of site attachment, possibly indicating a susceptibility to logging, however, the extent of site fidelity for most species is unknown. As pollinators, megachiropteran bats are likely to play a key role in maintaining the genetic diversity currently present in eucalypts by facilitating long-distance movement of pollen. Areas that are productive in nectar and pollen have a high conservation value for these bats and many other nectarivores, however, the age at which important nectar-producing trees flower is generally not known. The extent to which wildlife prescriptions, such as habitat trees and mosaics of small reserves, mitigate these impacts on bat species requires urgent research.

scholarly journals Genes predict long distance migration and large body size in a migratory fish, Pacific lamprey

2014 ◽  
Vol 7 (10) ◽  
pp. 1192-1208 ◽  
Author(s):  
Jon E. Hess ◽  
Christopher C. Caudill ◽  
Matthew L. Keefer ◽  
Brian J. McIlraith ◽  
Mary L. Moser ◽  
...  
Keyword(s):  
Body Size ◽  
Large Body ◽  
Migratory Fish ◽  
Long Distance ◽  
Large Body Size ◽  
Pacific Lamprey

scholarly journals Patterns of habitat segregation among large fishes in a Venezuelan floodplain river

2005 ◽  
Vol 3 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Craig A. Layman ◽  
Kirk O. Winemiller
Keyword(s):  
River Channel ◽  
Commercial Fishing ◽  
Biological Interactions ◽  
Habitat Types ◽  
Long Distance ◽  
Assemblage Composition ◽  
Floodplain River ◽  
Main River Channel ◽  
Venezuelan Llanos ◽  
Species Specific

Distribution and abundance of large fishes (SL>100 mm) in the río Cinaruco, a floodplain river in the Venezuelan llanos, were examined by gill net sampling in four habitat types: sand banks, backwater creeks, floodplain lagoons, and river channel. Sampling was standardized using nets (25 m x 2 m) of three mesh sizes set for 24-h periods. Based on data from >10,000 hours of gill netting over three years, there were significant differences in assemblage composition among the four habitats. Pair-wise comparisons suggested differences in assemblage composition between all pairs of habitats except creeks and lagoons. Differences in assemblage composition likely arose from species-specific habitat affinities. For example, 21 taxa were collected from both creeks and lagoons, but not from sand banks or the main river channel; each of these 21 taxa were associated with particular features characteristic of creeks and lagoons (e.g. abundant detritus). Assemblage structure also could be influenced by predation or other biological interactions, but mechanistic experiments are needed to evaluate this hypothesis. Assemblage composition was highly variable within all habitat types, likely the result of spatial and temporal heterogeneity associated with seasonal hydrology. Long distance migrations by prochilodontids and other taxa contributed to higher CPUE during the rising-water period of May 2002. Data from this study will provide a baseline to assess changes in the abundance and distribution of large-bodied fishes in response to increasing impacts from illegal commercial fishing in this region.

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