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2018 | 53 | 2 |

Tytuł artykułu

Variation of heterophil-to-lymphocyte ratio in the Great Tit Parus major - a review

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Warianty tytułu

PL
Zróznicowanie proporcji heterofili do limfocytów u bogatki - przegląd badań

Języki publikacji

EN

Abstrakty

EN
Permanent changes in the surrounding environment cause long-term stress in birds, which, when lasting days or weeks, affects the activity of the immune system and increases susceptibility to diseases, leading to changes in the levels of haematological parameters. The heterophil-to-lymphocyte ratio (H:L-ratio) is generally considered an independent and robust indicator of stress level in birds. This parameter allows in a simple way to evaluate activity of the immune system and individual health state of adult and nestling birds. It also enables assessing a body response to short- and long-term stress induced by, among others, the surrounding environment, social stress, blood parasites or a greater energy expenditure of females during breeding. Under conditions of field work the determination of the H:L- ratio is not difficult because what is only needed to conduct a blood smear test is a drop of blood that can be easily obtained even from birds of a small body mass. Moreover, an increase in the H:L-ratio is observed after about an hour from the moment of catching a bird contrary to other measurements like the determination of a baseline level of corticosterone. In this article available literature that discusses the impact of various factors on the H:L-ratio in the Great Tit as a species of 'fast-paced' life is reviewed. In adult and nestling birds the H:L-ratio is influenced by various factors — ecological and ecophysiological ones. In some cases the same factor, e.g. brood size manipulation or a type of habitat, can significantly influence the level of the discussed stress indicator as well as it may not show any impact at all. While interpreting the H:L-ratio one must take into account an impact of various ecological and ecophysiological factors on health state, such as habitat, phase of the annual cycle, differences between brood attempts, sex, age as well as on relations with other indicators of condition e.g. body mass or total blood haemoglobin concentration.
PL
Zgodnie z dostępną literaturą proporcję heterofili do limfocytów (H:L) można uznać za niezależny wskaźnik poziomu stresu u ptaków dorosłych, jak i piskląt. Parametr ten może być stosowany jako wskaźnik stanu biologicznego organizmu pozwalający na ocenę stanu zdrowia ptaków. W połączeniu z innymi parametrami kondycji organizmu, np.: hematologicznymi albo biochemicznymi, poziom proporcji H:L pozwala w prosty sposób ocenić zróżnicowanie stanu zdrowia organizmów dziko żyjących, jak również laboratoryjnych. Ustalenie poziomu proporcji H:L nie jest trudne w pracy terenowej, ponieważ do wykonania rozmazu wystarczy tylko kropla krwi co umożliwia m.in. prowadzenie badań na ptakach o małej masie ciała. Ponadto zmiana poziomu proporcji H:L, następuje dopiero po upływie około godziny od momentu złapania ptaka. W pracy dokonano przeglądu danych zebranych dla bogatki, modelowego gatunku dziuplaka. Na istotne zróżnicowanie albo jego brak w poziomie proporcji H:L u dorosłych, jak i piskląt sikory bogatki mogą wpływać czynniki ekologiczne i ekofizjologiczne (Tab. 2 i 3). Obserwuje się także pewną zmienność geograficzną (Tab. 1). Przy wyjaśnieniu uzyskanych wyników należy pamiętać, że interpretacja wyników proporcji H:L może powodować pewne trudności. Na przykład, wysoka liczba heterofili we krwi, a jednocześnie wysoki stosunek H:L, może sugerować trwającą chorobę, albo przeciwnie, może odzwierciedlać szybką odpowiedź organizmu na obecność patogenów w ustroju. Ponadto interpretując proporcję H:L należy wziąć pod uwagę wpływ różnych czynników ekologicznych i ekofizjologicznych na stan zdrowia ptaków, takich jak habitat, płeć oraz związki z innymi wskaźnikami kondycji organizmu, np. masa ciała lub stężenie hemoglobiny we krwi. Podsumowując, zaleca się kontynuowanie dalszych badań dotyczących stosunku H:L, które umożliwią osiągnięcie pełniejszej oceny wartości poznawczych tego wskaźnika stresu u ptaków. Prowadzone obserwacje powinny również koncentrować się na wyjaśnieniu, czy wzrost stosunku H:L we krwi obwodowej wynika jedynie z dobrego stanu biologicznego osobnika, czy wręcz przeciwnie, jest to znak trwającej choroby w ciele. Jednak pomimo pewnych wad stosunek H:L jest niezależnym i wygodnym wskaźnikiem z uwagi na jego powtarzalność, prostotę i szybkość uzyskania.

Wydawca

-

Czasopismo

Rocznik

Tom

53

Numer

2

Opis fizyczny

p.103-114,ref.

Twórcy

autor
  • Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90–237 Lodz, Poland

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