scholarly journals Effects of Water Temperature on the Egg-laying of the Monogenean Neoheterobothrium hirame.

2002 ◽  
Vol 37 (1) ◽  
pp. 41-43 ◽  
Author(s):  
Nobuyuki Tsutsumi ◽  
Keiichi Mushiake ◽  
Kohichiro Mori ◽  
Misao Arimoto ◽  
Tomoyoshi Yoshinaga ◽  
...  
Keyword(s):  
Water Temperature ◽  
Egg Laying ◽  
Neoheterobothrium Hirame

Effects of Water Temperature on the Development of the Monogenean Neoheterobothrium hirame on Japanese Flounder Paralichthys olivaceus

2003 ◽  
Vol 38 (2) ◽  
pp. 41-47 ◽  
Author(s):  
Nobuyuki Tsutsumi ◽  
Tomoyoshi Yoshinaga ◽  
Takashi Kamaishi ◽  
Chihaya Nakayasu ◽  
Kazuo Ogawa
Keyword(s):  
Water Temperature ◽  
Paralichthys Olivaceus ◽  
Japanese Flounder ◽  
Neoheterobothrium Hirame

The Duration of the Aquatic Stages of Anopheles minimus, Theo., determined by a new Method

1949 ◽  
Vol 40 (3) ◽  
pp. 371-377 ◽  
Author(s):  
C. R. Ribbands
Keyword(s):  
Life Cycle ◽  
Water Temperature ◽  
Egg Laying ◽  
New Method ◽  
Larval Life ◽  
Anopheles Minimus ◽  
Daily Range ◽  
Full Life Cycle ◽  
Full Life

A new method of determining the duration of the aquatic stages of Anophelines in nature is described. Repeated daily dippings of a stretch of stream were made, and the numbers of pupae and of larvae of each instar were recorded. The duration of the aquatic stages was then determined by analysis of the sequences of peaks in these numbers.The duration of larval life of A. minimus, when living in a stream at an average daily range of water temperature between 26·5°C. and 30·6°C, was seven days.The full life cycle of A. minimus, under monsoon conditions in Assam, probably occupied 14 days—egg 2 days, larva 7 days, pupa 2 days, adult to first egg-laying 3 days.

scholarly journals One Health initiative in the Bolivian Altiplano human fascioliasis hyperendemic area: Lymnaeid biology, population dynamics, microecology and climatic factor influences

2021 ◽  
Vol 30 (2) ◽  
Author(s):  
María Dolores Bargues ◽  
René Angles ◽  
José Coello ◽  
Patricio Artigas ◽  
Ilra Renata Funatsu ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Water Temperature ◽  
High Altitude ◽  
Endemic Area ◽  
One Health ◽  
Egg Laying ◽  
Temperature Threshold ◽  
Rdna Sequencing ◽  
Bolivian Altiplano ◽  
Very High

Abstract Fascioliasis is a freshwater snail-borne zoonotic disease. The Northern Bolivian Altiplano is a very high altitude endemic area where the highest human prevalences and intensities have been reported. Preventive chemotherapy by treatment campaigns is yearly applied. However, liver fluke infection of cattle, sheep, pigs and donkeys assures endemicity and consequent human infection and re-infection risks. A One Health action has therefore been implemented. Activity concerns lymnaeid vectors and environment diversity. Studies included growth, egg-laying and life span in laboratory-reared lymnaeids. Different habitat types and influencing factors were assessed. All populations proved to belong to Galba truncatula by rDNA sequencing. Analyses comprised physico-chemical characteristics and monthly follow-up of water temperature, pH and quantity, and lymnaeid abundance and density. Population dynamics in the transmission foci differed. Mean environmental temperature was lower than fluke development minimum temperature threshold, but water temperature was higher, except during winter. A two generations/year pattern appeared in permanent water habitats, and one generation/year pattern in habitats drying out for months. The multidisciplinary control measures can be extended from one part of the endemic area to another. These studies, made for the first time at very high altitude, constitute a baseline useful for fascioliasis control in other countries.

scholarly journals Larval Attachment and Development of the Monogenean Neoheterobothrium hirame under Low Water Temperature

2005 ◽  
Vol 40 (1) ◽  
pp. 33-35 ◽  
Author(s):  
Sho Shirakashi ◽  
Tomoyoshi Yoshinaga ◽  
Masakazu Oka ◽  
Kazuo Ogawa
Keyword(s):  
Water Temperature ◽  
Larval Attachment ◽  
Neoheterobothrium Hirame

Experimental increase in female mass during the fertile phase leads to enhanced extra-pair paternity in pied flycatchers Ficedula hypoleuca

2019 ◽  
Author(s):  
Mireia Plaza ◽  
Alejandro Cantarero ◽  
Juan Moreno
Keyword(s):  
Negative Relationship ◽  
Ficedula Hypoleuca ◽  
Egg Laying ◽  
Female Dominance ◽  
Laying Date ◽  
Control Group ◽  
Wing Loading ◽  
Potential Fecundity ◽  
Fertile Phase ◽  
Extra Pair Paternity

Female mass in most altricial birds reaches its maximum during breeding at egg-laying, which coincides temporally with the fertile phase when extra-pair paternity (EPP) is determined. Higher mass at laying may have two different effects on EPP intensity. On the one hand, it would lead to increased wing loading (body mass/wing area), which may impair flight efficiency and thereby reduce female’s capacity to resist unwanted extra-pair male approaches (sexual conflict hypothesis). On the other hand, it would enhance female condition, favouring her capacity to evade mate-guarding and to search for extra-pair mates (female choice hypothesis). In both cases, higher female mass at laying may lead to enhanced EPP. To test this prediction, we reduced nest building effort by adding a completely constructed nest in an experimental group of female pied flycatchers (Ficedula hypoleuca). Our treatment caused an increase in mass and thereby wing loading and this was translated into a significantly higher EPP in the manipulated group compared with the control group as expected. There was also a significant negative relationship between EPP and laying date and the extent of the white wing patch, an index of female dominance. More body reserves at laying mean not only a higher potential fecundity but a higher level of EPP as well. This interaction had not previously received due attention but should be considered in future studies of avian breeding strategies.

Elevated nest predation risk promotes offspring size variation in birds with prolonged parental care.

2019 ◽  
Author(s):  
Gretchen F. Wagner ◽  
Emeline Mourocq ◽  
Michael Griesser
Keyword(s):  
Predation Risk ◽  
Reproductive Cycle ◽  
Perceived Risk ◽  
Nest Predation ◽  
Bird Species ◽  
Size Variation ◽  
Egg Laying ◽  
Offspring Size ◽  
Natural Predation ◽  
Risk Spreading

Predation of offspring is the main cause of reproductive failure in many species, and the mere fear of offspring predation shapes reproductive strategies. Yet, natural predation risk is ubiquitously variable and can be unpredictable. Consequently, the perceived prospect of predation early in a reproductive cycle may not reflect the actual risk to ensuing offspring. An increased variance in investment across offspring has been linked to breeding in unpredictable environments in several taxa, but has so far been overlooked as a maternal response to temporal variation in predation risk. Here, we experimentally increased the perceived risk of nest predation prior to egg-laying in seven bird species. Species with prolonged parent-offspring associations increased their intra-brood variation in egg, and subsequently offspring, size. High risk to offspring early in a reproductive cycle can favour a risk-spreading strategy particularly in species with the greatest opportunity to even out offspring quality after fledging.

The diatoms as a component of bottom algocenoses in the mouth of the Oka River

2019 ◽  
Author(s):  
Alexander G. Okhapkin ◽  
Tabet Hhedairia
Keyword(s):  
Water Temperature ◽  
Preliminary Estimation ◽  
Composition And Structure

The preliminary estimation of composition and structure of diatoms in the benthos of the Oka River allowed to determine the clear spatiotemporal confinedness of structure in such communities of them which has the most diverse composition in the low water period while water temperature decreasing.

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