Long-lived population demographics in a declining, vulnerable fishery - bigmouth buffalo (Ictiobus cyprinellus) of Jamestown Reservoir, North Dakota

2021 ◽  
Author(s):  
Alec R. Lackmann ◽  
Brandon J. Kratz ◽  
Ewelina S. Bielak-Lackmann ◽  
Reed I. Jacobson ◽  
Derek J. Sauer ◽  
...  
Keyword(s):  
Life History ◽  
North Dakota ◽  
Sexual Maturity ◽  
Biological Information ◽  
Population Demographics ◽  
The Past ◽  
Commercial Harvest ◽  
Harvest Data ◽  
Demographic Patterns ◽  
Episodic Recruitment

Despite decades of commercial harvest of bigmouth buffalo (Ictiobus cyprinellus) from Jamestown Reservoir, North Dakota, and the recent rapid growth of sport bowfishing that targets this species, there is a lack of biological information on this native catostomid. At present, no-limit recreational and commercial harvest of bigmouth buffalo occurs in North Dakota, with no harvest-reporting for recreational take. A long-lived life history was recently documented for this species with a lifespan exceeding 100 years. At Jamestown Reservoir, bigmouth buffalo were aged to 58 years of age, with onset of sexual maturity 10 years for females. Evidence for episodic recruitment over a 60-year period was in 1962–1979, 1993–2011, and 2017 with recruitment success more likely during non-drought periods. Annual commercial harvest data from this reservoir indicate bigmouth buffalo have declined significantly over the past 30 years, most precipitously since 2010 during the bowfishing era. The demographic patterns, episodic recruitment and harvest changes observed in this population are relevant for informing management of bigmouth buffalo and other long-lived freshwater fishes.

scholarly journals Felid Cardiopulmonary Nematodes: Dilemmas Solved and New Questions Posed

Pathogens ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 30
Author(s):  
Donato Traversa ◽  
Simone Morelli ◽  
Angela Di Cesare ◽  
Anastasia Diakou
Keyword(s):  
Respiratory Infections ◽  
Small Animal ◽  
Biological Information ◽  
Scientific Debate ◽  
The Past ◽  
Research Perspectives ◽  
Unexpected Findings ◽  
New Research ◽  
Alternative Routes ◽  
Applied Knowledge

In the past decade cardiopulmonary nematodes affecting felids have become a core research topic in small animal parasitology. In the late 2000s, an increase in studies was followed by unexpected findings in the early 2010s, which have stimulated research teams to start investigating these intriguing parasites. Prolific scientific debate and exchanges have then fostered field and laboratory studies and epi-zootiological surveys. New data have improved basic and applied knowledge, solved dilemmas and posed new questions. This article discusses the past and present background to felid cardiopulmonary nematodes after the last few years of intense scientific research. New data which have demonstrated the key role of Aelurostrongylus abstrusus and Troglostrongylus brevior in causing respiratory infections in domestic cats, and on the nil to negligible current importance of other species, i.e., Troglostrongylus subcrenatus, Oslerus rostratus and Angiostrongylus chabaudi, are presented. Biological information and hypothesized alternative routes of infection are analysed and discussed. Novel identification and taxonomical data and issues are reported and commented upon. On the whole, recent biological, ecological and epi-zootiological information on felid meta-strongyloids is critically analysed, with the aim to answer outstanding questions, stimulate future studies, and underline new research perspectives.

Reproductive Ecology of The Allied Rock-wallaby, Petrogale assimilis.

1996 ◽  
Vol 19 (2) ◽  
pp. 209
Author(s):  
R. Delaney
Keyword(s):  
Life History ◽  
Sex Ratio ◽  
Sexual Maturity ◽  
Post Partum ◽  
Reproductive Ecology ◽  
Oestrous Cycle ◽  
Embryonic Diapause ◽  
Minimum Age

Petrogale assimilis has a typical life history and reproductive ecology for a macropodid of its size. Both sexes are capable of reproducing continuously; gestation is about the same length as the oestrous cycle (approximately one month); a single young is born and, a post-partum oestrus and embryonic diapause probably occurs. The sex ratio of young is unbiased. Pouch young remain permanently attached to the teat until 110 - 143 days (n=11). Permanent exit from the pouch occurs at 180 - 231 days (mean=201 days, n=25), and weaning occurs between 267 - 387 days (n=5). Sexual maturity occurs at a minimum age of 17.5 months in females and 23 months in males.

Socialist Modernisation in Mongolia as Narrated after Socialism

Inner Asia ◽  
2010 ◽  
Vol 12 (1) ◽  
pp. 5-23 ◽  
Author(s):  
Yuki Konagaya
Keyword(s):  
Life History ◽  
Oral History ◽  
Life Histories ◽  
Oral Histories ◽  
View Point ◽  
The Past ◽  
Ex Post ◽  
History Narratives

AbstractIn this article I introduce our collection of oral histories composed of life histories recorded between 2001 and 2006. First, I discuss some devices implemented in the process of collecting life histories, which was to make oral histories 'polyphonic'. I then suggest that oral history always has a 'dual' tense, in that people talk about 'the past' from the view point of 'the present'. This is illustrated by six cases of statesmen narrating their views about socialist modernisation. Finally, using one of the cases, I demonstrate the co-existence of non-official or private opinions along with official opinions about the socialist period in life-history narratives in the post-socialist period. I call this 'ex-post value'.

scholarly journals The Domestication of Evolution

1983 ◽  
Vol 10 (4) ◽  
pp. 283-292 ◽  
Author(s):  
Raymond P. Coppinger ◽  
Charles Kay Smith
Keyword(s):  
Life History ◽  
Sexual Maturity ◽  
Domestic Animals ◽  
Stable Environment ◽  
In The Wild ◽  
Species Specific

A coming ‘Age of Interdependent Forms’ seems destined to mark the success of what could be called ‘despecialized/interspecific fitness’ among neotenic strains (perpetuating juvenile traits) of species such as humans and domestic animals. Humans as well as the first domesticants underwent a neotenic evolution in the wild during the repeated interglacial periods which, acting on a number of mammalian forms, selected against adult species-specific ancestral adaptations to a stable environment. Neotenic species continue to look and behave more like ancestral youths than adults—even after sexual maturity and throughout their life-history. As they retain lifelong youthful dependency motivations, they can easily, under suitable conditions, become interdependent forms. By the time of melting of the last Pleistocene glacier, all the domestic partners had already become more dependency-prone than formerly, and were behaviourally despecialized enough to form the alliance that is now changing the order of Nature.

The Leeuwenhoek Lecture, 1972 - Carbohydrate transport by micro-organisms

1973 ◽  
Vol 183 (1071) ◽  
pp. 105-123 ◽  
Keyword(s):  
Molecular Basis ◽  
Well Being ◽  
Black Pepper ◽  
Biological Information ◽  
Small Animals ◽  
Complete Understanding ◽  
The Past ◽  
Micro Organisms ◽  
Christopher Wren ◽  
Economic Well Being

It is 295 years almost to the day since the existence of micro-organisms was confirmed at a meeting of this Society. The minutes of that meeting of 15 November 1677 record Mr Hooke ̓s success in eliciting the appearance, in a suspension of black pepper in rainwater, of ̒. . . great numbers of exceedingly small animals swimming to and fro. They appeared of the bigness of a mite through a glass, that magnified about an hundred thousand times in bulk; and consequently it was judged, that they were near an hundred thousand times less than a mite.̓ Since some doubts had been expressed at previous meetings, the minute firmly concludes that ̒. . . there could be no fallacy in the appearance. They were seen by Mr Henshaw, Sir Christopher Wren, Sir John Hoskyns, Sir Jonas Moore, Dr Mapletoft, Mr. Hill, Dr. Croune, Dr. Grew, Mr. Aubrey, and divers others; so that there was no longer any doubt of Mr. Leewenhoeck ̓s discovery ̓. (Birch 1757.) It is not my purpose here to comment on the importance of that discovery to our physical and economic well-being, nor to describe the manner in which studies with micro-organisms have revealed much of the molecular basis of the events that enable cells to maintain and accurately to reproduce themselves. These topics have formed the subjects of previous lectures in honour of Leeuwenhoek ̓s memory. I wish to discuss a topic that, as far as I am aware, has been only touched on, once before (Gale 1957), yet that concerns the indispensable first step in the utilization of all food materials. I refer to the highly specific mechanisms that enable such food materials to enter microbial cells, and the means that regulate the operation of such systems. It is a measure of the rapidity at which biological information accrues, as well as an explanation of why a topic of such fundamental importance appears to have been neglected, that most of our still far-from-complete understanding in this area has been achieved within the past five years, and all of it since, in the first Leeuwenhoek Lecture (Fildes 1951) delivered exactly 22 years ago today, Sir Paul Fildes discussed ̒. . . the development of events which has made it convenient to foster a new branch of biology under the title Microbiology ̓.

Chamelea gallina reproductive biology and Minimum Conservation Reference Size: implications for fishery management in the Adriatic Sea

BMC Zoology ◽  
2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Giada Bargione ◽  
Fortunata Donato ◽  
Giulio Barone ◽  
Massimo Virgili ◽  
Pierluigi Penna ◽  
...  
Keyword(s):  
Sexual Maturity ◽  
Adriatic Sea ◽  
Seawater Temperature ◽  
Reproductive Capacity ◽  
Great Effort ◽  
Important Species ◽  
Spawning Period ◽  
The Past ◽  
Chamelea Gallina ◽  
Size At Sexual Maturity

Abstract Background The striped venus clam Chamelea gallina is an economically important species in Adriatic Sea fisheries. The use of hydraulic dredging for its catch has a long history in Italy and its management faced several stages of development in the last 40 years. A great effort has been made in the past two decades to move from poorly or weakly managed fisheries to a well-structured co-management system to improve the sustainability of this fishery. However, a prerequisite for appropriate resource management is a sound knowledge of the biology and reproductive strategy of the species. Results We investigated three major biological features– the gametogenic cycle, size at sexual maturity and partial fecundity – by microscopic, histological and video analysis techniques. We demonstrated that its breeding season is driven by rises in seawater temperature and chlorophyll-a concentration and that its spawning period lasted from March to September. Size at sexual maturity was reached very early in the life cycle. As regards partial fecundity – the number of mature oocytes potentially released by females with ripe gonads in a single release event – varied in relation to size. Nevertheless, the reduction on the Minimum Conservation Reference Size (MCRS) from 25 to 22 mm (Delegated Regulation (EU) 2020/2237) lead to a 40% reduction in the number of emitted eggs. Conclusions We suggest that the ability of Adriatic clam stocks to withstand the strong fishing pressure of the past 40 years and the present one is due to their high reproductive potential and multiple spawning events combined with the effect of management measures (closed areas/seasons, quota, MCRS) and technical constraints on the gear and the sieve on board. Moreover, since the reduced MCRS for Venus shells is still larger than the size at maturity, it will probably not be detrimental to the reproductive capacity of the stock.

Paddlefish Management, Propagation, and Conservation in the 21st Century

2009 ◽  
Keyword(s):  
Mississippi River ◽  
First Year ◽  
State Agencies ◽  
Ohio River ◽  
Independent Data ◽  
Arkansas River ◽  
Commercial Harvest ◽  
Harvest Data ◽  
Sport Fisheries ◽  
Anthropogenic Alterations

<em>Abstract</em>.—Paddlefish <em>Polyodon spathula </em>have been intensively harvested in both sport and commercial fisheries. Recent harvests (2000–2006) were surveyed from state agencies and compared to historical harvests (1965– 1975). Seven major sport fisheries had recent annual harvests greater than 1,000 fish, and most large sport fisheries appeared to have sustainable harvests due to intensive management. Recent commercial harvest was greater than sport harvest across the species’ range. Most of the commercial harvest was from Arkansas, Kentucky, and Tennessee. Annual commercial harvest from the Ohio River increased from 6,000 to 196,000 kg from 1965–1975 to 2000–2006. Annual harvest remained substantial from the Arkansas River (37,000 kg), the lower Tennessee River (121,000 kg), and the Mississippi River (103,000 kg). Harvests of paddlefish (sport and commercial) compiled from the literature were highly variable and ranged between 0.01 and 5.06 fish/ ha and 0.04–43.43 kg/ha (median = 0.12 fish/ha, 1.73 kg/ha). Stock depression has been associated with a first-year harvest as low as 1.46 kg/ha, and harvests greater than 5 kg/ha were usually associated with overfishing or opening a previously closed fishery. Case histories from the Tennessee and Ohio River systems documented that paddlefish were susceptible to overharvest in lentic waters and river reservoirs, but the threat posed by commercial harvest from large rivers will remain unresolved until more fisheries-independent data becomes available. Anthropogenic alterations to habitat, overreliance on harvest data, and lack of fisheries-independent data limit our historical understanding of the degree of threat that harvest is to paddlefish populations.

Reflections on North Dakota’s Sustained Solitary Confinement Reform

2019 ◽  
pp. 325-334
Author(s):  
Leann K. Bertsch
Keyword(s):  
North Dakota ◽  
Community Corrections ◽  
Solitary Confinement ◽  
The Past ◽  
The North ◽  
Department Of Corrections ◽  
The Way

As director of the North Dakota Department of Corrections and Rehabilitation (ND DOCR), I have overseen its adult, juvenile, and community corrections services for the past thirteen years. This chapter will focus on the broader systems reforms that were implemented prior to solitary confinement reform at the ND DOCR, why it was necessary to change the way we use solitary confinement or restrictive housing, the specific changes we made within the unit, how we improved transitions from the unit, the challenges associated with this work, and the successes we have seen as a result of the reforms.

On the Correlation of the Life-history of the Acephaline Gregarine, Gonospora, with the Sexual Cycle of its Host

Parasitology ◽  
1930 ◽  
Vol 22 (4) ◽  
pp. 505-509 ◽  
Author(s):  
C. C. Hentschel
Keyword(s):  
Life History ◽  
Sexual Maturity ◽  
Sexual Cycle ◽  
History Of

1. In general there is a correlation between the life-history of Gonospora arenicolae and the sexual cycle of its host, Arenicola ecaudata, similar to that between G. varia and Audouinia tentaculata.2. In the species under consideration the correlation is not so definite and the life-history of a generation of parasites does not necessarily coincide with a sexual cycle of the host. This is complicated by the double annual spawning of the host.3. The formation of sporocysts is simultaneous with the sexual maturity of the worm.4. It is suggested that, as in Audouinia, a secretion produced by the gonads stimulates the development of the gregarine.5. The ejection of the sporocysts with the gametes was observed.6. It is suggested that phagocytosis may be the cause of the rupture of the gametocysts in this species.

Life history of Mysis stenolepis Smith (Crustacea, Mysidacea)

1975 ◽  
Vol 53 (7) ◽  
pp. 942-952 ◽  
Author(s):  
T. Amaratunga ◽  
S. Corey
Keyword(s):  
Young Adults ◽  
Life History ◽  
New Brunswick ◽  
Shallow Water ◽  
Field Study ◽  
Sexual Maturity ◽  
Developmental Stages ◽  
Shallow Waters ◽  
Passamaquoddy Bay ◽  
History Of

A 17-month field study showed that Mysis stenolepis in Passamaquoddy Bay, New Brunswick lives for about 1 year. Young are released in shallow water early in spring and grow rapidly during the summer. In the fall, young adults migrate to deeper water where they reach sexual maturity. Transfer of sperm lakes place during winter in deeper regions of the Bay. soon after which the males die. Females survive and in spring migrate to shallow waters to release young after which they die. Females breed once and carry an average of 157 young per brood. Developmental stages of the postmarsupial young are described and discussed.

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