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Wyszukujesz frazę "hatching" wg kryterium: Temat


Tytuł:
Offspring survival is negatively related to maternal response to sheep red blood cells in zebra finches
Autorzy:
Martyka, Rafał
Arct, Aneta
Cichoń, Mariusz
Rutkowska, Joanna
Opis:
The immune system is an important player in individual trade-offs, but what has rarely been explored is how different strategies of investment in immune response may affect reproductive decisions. We examined the relationship between the strength of maternal immune response and offspring viability and immune response in captive zebra finches Taeniopygia guttata. In three independent experiments, the females and subsequently their adult offspring were challenged with sheep red blood cells, and their responses were measured. There was no relationship between offspring immune response and that of their mothers. However, we found offspring survival until adulthood to be negatively related to maternal antibody titers. That effect was consistent among all experiments and apparent despite the fact that we partially cross-fostered newly hatched nestlings between nests of different females. This suggests that the observed effects of maternal immune response is not mediated by potentially altered female rearing abilities. To our knowledge, this is the first study showing the relationship between the strength of the immune response and between-generational fitness costs in birds.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The effects of substrate temperature on the reproductive success of Caretta caretta on a volcanic beach in the Mediterranean Sea
Autorzy:
Vecchioni, Luca
Citarrella, Andrea
Cambera, Irene
Di Gangi, Antonella
D’Emanuele, Dario
Ventura, Lucia
Principato, Elena
Visconti, Giulia
Torri, Marco
Faraone, Francesco P.
Arculeo, Marco
Tematy:
conservation strategy
hatching success
loggerhead sea turtle
shade cloth cover
Sicily
Pokaż więcej
Wydawca:
Instytut Technologiczno-Przyrodniczy
Powiązania:
https://bibliotekanauki.pl/articles/58906939.pdf  Link otwiera się w nowym oknie
Opis:
A five-year of monitoring (2018-2022) of the loggerhead sea turtle Caretta caretta nests in “Pozzolana di Ponente” beach on Linosa Island (Pelagie Archipelago, Italy) is here reported. To explore how temperatures affect the hatching success and the possible occurrence of any malformation in hatchlings, incubation temperature values were recorded using data loggers positioned at depths of 5 and 35 cm (for each nest) from the surface, approximately 0.5 m from the nest chamber. The obtained results highlighted important issues related to the success of hatching and the incidence of body anomalies. The temperatures recorded at different depths near the nests (5 and 35 cm) in some periods of incubation of the eggs were above optimal development temperature (i.e., ~33°C), causing high mortality rates, especially during the first two years of the survey (2018-2019). In the next three years (2020-2022), the implementation of shading cover cloths of the nests increased the survival rate and decreased the incidence of malformed individuals. Furthermore, atmospheric temperature data were extrapolated from the “Copernicus Climate Change” web service and included in our analyses to assess any changes over the timeframe analysed. Over five years (2018-2022), the average atmospheric temperature increased slightly by 1.7°C. In light of global warming, the implementation of effective and low-cost mitigation activities, such as the use of shade cloth covers to protect the nests from overheating, should be considered a suitable conservation action.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of Wolbachia : male age and mating history on cytoplasmic incompatibility and sperm transfer in Drosophila simulans
Autorzy:
Champion de Crespigny, F.
Awrahman, Zmnako
Wedell, N.
Opis:
Most insects harbour a variety of maternally inherited endosymbionts, the most widespread being Wolbachia pipientis that commonly induce cytoplasmic incompatibility (CI) and reduced hatching success in crosses between infected males and uninfected females. High temperature and increasing male age are known to reduce the level of CI in a variety of insects. In Drosophila simulans, infected males have been shown to mate at a higher rate than uninfected males. By examining the impact of mating rate independent of age, this study investigates whether a high mating rate confers an advantage to infected males through restoring their compatibility with uninfected females over and above the effect of age. The impact of Wolbachia infection, male mating rate and age on the number of sperm transferred to females during copulation and how it relates to CI expression was also assessed. As predicted, we found that reproductive compatibility was restored faster in males that mate at higher rate than that of low mating and virgin males, and that the effect of mating history was over and above the effect of male age. Nonvirgin infected males transferred fewer sperm than uninfected males during copulation, and mating at a high rate resulted in the transfer of fewer sperm per mating irrespective of infection status. These results indicate that the advantage to infected males of mating at a high rate is through restoration of reproductive compatibility with uninfected females, whereas uninfected males appear to trade off the number of sperm transferred per mating with female encounter rate and success in sperm competition. This study highlights the importance Wolbachia may play in sexual selection by affecting male reproductive strategies.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The rate of egg laying and hatching of the slug Arion lusitanicus Mabille, a pest of arable crops
Autorzy:
Kozlowski, J
Sionek, R.
Tematy:
Gastropoda
pest
egg hatching
arable crop
Arion lusitanicus
Arionidae
slug
egg laying
Pulmonata
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/65197.pdf  Link otwiera się w nowym oknie
Opis:
The experiments were carried out in Rzeszów, a region of the Arion lusitanicus mass occurrence, and also in Poznań. The studies were performed under field conditions, in isolators dug inio the ground. It was found that the slug began egg laying by the end of the first decade of August. The period of egg laying, depending on meteorological conditions, lasted for 2-3.5 months. The eggs were laid in clutches, each containing from 5 to 193 eggs. Most of eggs laid in August hatched before winter. For the eggs laid in mid-August the period of hatching was shorter than those laid at the turn of August/September, and the percentage of hatched eggs was lower. Eggs deposited at later dates (in September-November) did not hatch before winter.
W latach 1997-1999 prowadzono badania dotyczące terminu składania i wylęgania jaj Arion lusitanicus. W okresie jesienno-zimowym 1999 roku obserwowano także tempo wylęgania jaj złożonych w różnych terminach, procent wylęgłych jaj i długość okresu wylęgania. Doświadczenia założono w Rzeszowie, w rejonie masowego występowania ślimaka, oraz w Poznaniu. Badania prowadzono w warunkach polowych, w izolatorach wkopanych w ziemię. Stwierdzono, że ślimak rozpoczynał składanie jaj pod koniec pierwszej dekady sierpnia. Okres składania jaj w zależności od warunków meteorologicznych trwał od 2 do 3,5 miesiąca. Jaja były składane w złożach - od 5 do 193 jaj w jednym złożu. Do końca roku wylęgało się około 40% jaj. W badaniach jesienno-zimowych w 1999 roku stwierdzono, że większość jaj złożonych w sierpniu wylęgła się przed zimą. Dla jaj złożonych w połowie sierpnia okres wylęgu jaj był krótszy niż dla jaj złożonych na przełomie sierpnia i września, a procent wylęgłych jaj był niższy. Jaja złożone w późniejszych terminach (wrzesień-listopad) nie wylęgały się przed zimą.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Notatki o próbach wylęgu ikry ryb łososiowatych bez przepływu wody = Rapport provisoire des expériences dincubation sans eau courante des oeufs du poissons de la famille Salmonidae
Autorzy:
Kulmatycki, Włodzimierz Julian (1895–1939)
Wydawca:
unknown
wydawca nieznany
Powiązania:
Publications of famous biologists - a collection of prints
Publikacje znanych biologów (zbiór odbitek OZwRCIN)
Opis:
"Nadbitka z I. Tomu Archiwum Rybactwa Polskiego"
38 s. : il. ; 23 cm
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka

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