scholarly journals Population structure of Gammarus izmirensis (Amphipoda) inhabiting Yiğitler Brook (Nif Stream, İzmir)

2019 ◽  
Vol 36 (2) ◽  
pp. 101-107
Author(s):  
Murat Özbek ◽  
Efe Ulutürk
Keyword(s):  
Population Structure ◽  
Life Cycle ◽  
Flow Regime ◽  
Biological Diversity ◽  
Original Description ◽  
Aquatic Habitats ◽  
Two Generations ◽  
Regular Flow ◽  
Maximum Body ◽  
Maximum Body Length

Yiğitler Brook, one of the branches of Nif Stream, has a regular flow regime throughout the year. The brook is one of the important aquatic habitats in terms of biological diversity by having relatively unpolluted water. The main objective of the present study is to get information about the population structure of Gammarus izmirensis Özbek, 2007 whose type locality is Yiğitler Brook. There is no information about the species in literature except its original description paper. Gammarus specimens were sampled in monthly intervals between October 2015 and November 2016. Samplings were performed at one locality. During the study, a total of 1938 G. izmirensis specimens were investigated. Of them; 850 were females, 586 were males and 502 were juveniles. The maximum body length was 14.5 mm in males and 14.0 mm in females. The number of juveniles is higher in March and August. The species has a multivoltine life cycle with two generations (spring and summer) throughout the year.

Life history of Allocreadium fasciatusi Kakaji, 1969 (Trematoda: Allocreadiidae) from the freshwater fish Aplocheilus melastigma McClelland

1978 ◽  
Vol 52 (1) ◽  
pp. 51-59 ◽  
Author(s):  
R. Madhavi
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Freshwater Fish ◽  
Original Description ◽  
Life Cycles ◽  
Long Tail ◽  
Mesocyclops Leuckarti ◽  
Two Generations ◽  
History Of ◽  
First Intermediate Host

ABSTRACTThe life history of Allocreadium fasciatusi which occurs in the intestine of a freshwater fish Aplocheilus melastigma has been worked out in detail. The snail Amnicola travancorica acts as the first intermediate host. The miracidium hatching out from the eggs attacks the snail and passes through two generations of rediae. Cercariae are of ophthalmoxiphidiocercous type with very long tail and are identical to Cercariae Indicae XLIX Sewell, 1922. The cercariae penetrate and develop into metacercariae in the haemecoel of the copepods Mesocyclops leuckarti, Microcyclops varicans and Marcocyclops distructus. Upon ingestion by the definitive host, the metacercariae excyst and develop into adults. All the stages in the life cycle are described and the life cycle is compared with other allocreadiid life cycles. The original description of A. fasciatusi is revised and Psilostomum chilkai Chatterji, 1956 from Lates calcalifer is synonymized with it.

Estimating mean body masses of marine mammals from maximum body lengths

1998 ◽  
Vol 76 (5) ◽  
pp. 886-896 ◽  
Author(s):  
Andrew W Trites ◽  
Daniel Pauly
Keyword(s):  
Marine Mammals ◽  
Growth Curves ◽  
Survival Models ◽  
Regression Equations ◽  
Sperm Whales ◽  
Baleen Whales ◽  
Sea Lions ◽  
Living Species ◽  
Maximum Body ◽  
Maximum Body Length

Generalized survival models were applied to growth curves published for 17 species of cetaceans (5 mysticetes, 12 odontocetes) and 13 species of pinnipeds (1 odobenid, 4 otariids, 8 phocids). The mean mass of all individuals in the population was calculated and plotted against the maximum body length reported for each species. The data showed strong linearity (on logarithmic scales), with three distinct clusters of points corresponding to the mysticetes (baleen whales), odontocetes (toothed whales), and pinnipeds (seals, sea lions, and walruses). Exceptions to this pattern were the sperm whales, which appeared to be more closely related to the mysticetes than to the odontocetes. Regression equations were applied to the maximum lengths reported for 76 species of marine mammals without published growth curves. Estimates of mean body mass were thus derived for 106 living species of marine mammals.

Life cycle and population structure of the terrestrial isopodHemilepistus klugii(Brandt, 1833) (Isopoda: Oniscidea) in Iran

2011 ◽  
Vol 45 (33-34) ◽  
pp. 2081-2094 ◽  
Author(s):  
Ghasem M. Kashani ◽  
Alireza Sari ◽  
Shidokht Hosseinie ◽  
Masoumeh Malek ◽  
Ehsan Entezari
Keyword(s):  
Population Structure ◽  
Life Cycle

Economies and Strategies of the Northern Rural Poor: the Mitigation of Poverty in a West Riding Township in the Nineteenth Century

Rural History ◽  
2017 ◽  
Vol 28 (1) ◽  
pp. 69-92 ◽  
Author(s):  
GRAHAM RAWSON
Keyword(s):  
Nineteenth Century ◽  
Life Cycle ◽  
Major Part ◽  
Poor Relief ◽  
Rural Poor ◽  
Poor Law ◽  
The Poor ◽  
Economic Strategies ◽  
Two Generations ◽  
Northern Community

Abstract:In the agricultural township of Rigton, ten miles north of Leeds, three-quarters of labouring households had recourse to poor relief at some stage between 1815 and 1861. The chronology of this microhistory straddles the end of the French Wars, the Sturges Bourne reforms, and, due to the existence of the country's largest Gilbert Unions, the region's laggardly application of the Poor Law Amendment Act. It seeks, by source linkage, to establish the contexts of labour, welfare and the life cycle within a northern community, and place the poor and their experiences of, and strategies against, poverty within that community. A demographic overview introduces the contexts of labouring families' lives, whilst a commentary on expositions of biographical reconstitutions of two generations of a labouring family, forms a major part of this exploration. This argues that whilst relationships with, and mitigation against, poverty were fluid and complex, as the century progressed labouring families had a decreasing interface with the Poor Law, and adopted and developed new economic strategies to add to their portfolio of makeshifts.1

The morphology of free-living stages and immature parasites of Rhabdias paraensis (Nematoda: Rhabdiasidae), a parasite of Rhinella marina (Anura: Bufonidae) in Brazil

2016 ◽  
Vol 61 (1) ◽  
Author(s):  
Francisco Tiago de Vasconcelos Melo ◽  
Luciana de Cássia Silva do Nascimento ◽  
Lilian Cristina Macedo ◽  
Jeannie Nascimento dos Santos ◽  
Yuriy Kuzmin
Keyword(s):  
Life Cycle ◽  
Buccal Capsule ◽  
Original Description ◽  
Species Determination ◽  
Free Living ◽  
Rhinella Marina ◽  
Additional Information ◽  
New Information ◽  
Apical View

AbstractRhabdias paraensis Santos, Melo, Nascimento, Nascimento, Giese et Furtado, 2011 was described based on fully gravid worms. Further investigations on the free-living stages, immature worms and young individuals were facilitated by cultivation in the laboratory, which allowed us to add new information about the morphology and development of the species. Observations on the free-living development of R. paraensis showed that the life cycle is typical of Rhabdias, with alternation of gonochoristic and hermaphroditic generations and without homogony. Males of the free-living generation were different from those in several species of the genus studied previously. In the original description, the excretory glands and duct were absent in gravid specimens of R. paraensis, while in this study, distinct excretory glands and a duct were observed in immature and young individuals. Additionally, we recognised the separation of the buccal capsule walls into anterior and posterior portions and described the specific shapes of these portions in lateral and apical view. Studies on the morphology and development of free-living stages of Rhabdias spp. from Neotropical regions may provide additional information for species determination.

scholarly journals Methods of supporting the development of Phytophthora cinnamomi rands on representatives of the Ericaceae DC family. In the orangeries of the Botanical garden of Peter the Great

2021 ◽  
Vol 1 (157) ◽  
pp. 26-33
Author(s):  
E. A. Varfolomeeva ◽  
E. O. Rezanko
Keyword(s):  
Population Structure ◽  
Life Cycle ◽  
Soil Microorganisms ◽  
Phytophthora Cinnamomi ◽  
Botanical Garden ◽  
Wide Distribution ◽  
Rhizospheric Soil ◽  
Potassium Humate ◽  
Peter The Great ◽  
Resistance Inducers

In recent years, in the orangeries of the Peter the Great Botanical Garden, the affection of representatives of the Ericaceae family, the genus rhododendron (Rhododendron (L.) oomycete Phytophthora cinnamomi, has been growing. In the study of the rhizospheric soil of sick and healthy plants, a wide distribution of Phytophthora was found. representatives of this family. The dynamics of the spread of the disease from 2012 to 2019 is presented. The population of Phytophthora cinnamomi in the soils is unevenly distributed, changing its structure (abundance, survival, seasonality, life cycle) in accordance with various micro -phytocenoses. The population structure is governed by coenotic relationships with soil microorganisms. The Phytophthora cinnamomi population is “pulsating,” with a maximum population (in May-June) and a minimum in NovemberDecember. The creation of suppressive soils and suppression factors may serve as a preliminary strategy when creating measures to protect plants of the Peter the Great Botanical Garden. The results of studies of the effects of biological products (Vitaplan, Sternifag, Gliokladin) and fertilizers (Potassium humate, Ecofus) on the pathogen are presented. To increase immunity, resistance inducers (immunocytophyte, sillplant, chitosan) were used.

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