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pēdējā laikā daudz aprunātais E7


Paldies par informāciju.Sunshine wrote:Te vēl informācijas/faktu apkopojums par brāļu/māsu sāncensību baltgalvas ērgļu ligzdās:
(info no Eagle CAM)
http://www.ournaturezone.com/index.php?topic=1495.0
Daži citāti:
The American Bald Eagle Foundation: "Two eggs usually hatch in each Bald Eagle nest, but, often due to siblicide, only one eaglet will survive."
Of the 105 nestings with 2 hatches, both eaglets successfully fledged 77 times (73%), 1 eaglet fledged and 1 died 22 times (21%), and both died 6 times (6%). Of the 34 who died, the cause of death was parent neglect (6), killed by intruder (4), storm (4), failed in the first day or two (3), accident (5), illness (1), unknown (7), possible siblicide (1), and known siblicide (3). Based on these figures (including the possible siblicide), the incidence of siblicide on a nest with 2 eaglets is 3.8%.
Hornby Eagle Group Projects Society, FAQ on sibling aggression:
"The older bird is larger, heavier, and more developed than the younger bird, so it requires more food and is avid for its share. Siblings will thus compete for food and parental attention, with one bird attempting to out-compete or dominate the other. The younger bird soon learns to keep a low profile until the older has been satisfied and quickly learns to use its wits, making grabs for food or doing 'end runs' around the larger bird. This behaviour occurs more within the first two weeks of life, declining as the siblings learn. Siblicide (one eaglet killing or causing the starvation of another) appears to be rare in bald eagles."
Kāds no putnu pētniekiem parēķinājis, ka mazākais cālis aiziet bojā brāļu/māsu sāncensības dēļ tikai aptuveni 3,8 procentos gadījumu. Citi iemesli bija vecāku pamešana novārtā, iebrucējs ligzdā, vētra (laikapstākļi), nelaimes gadījumi, slimība. Tādējādi bojāeja brāļu/māsu sāncensības dēļ tomēr ir salīdzinoši reta.
Ja vien mazākais ir attapīgs, tas ātri vien iemācās veidus, kā "apiet" lielāko un tikt pie barības. Mazajiem augot, agresijai vajadzētu samazināties.
Viky wrote:
Paldies par informāciju.
Bet vecāku neiejaukšanās bērnu attiecībās, manuprāt, arī pieskaitāma pie ''pamešanas novārtā''. Ok, saprotu, ka tā ir dzīves skola, Gribi ēst, cīnies! Bet robežai ir jābūt.
Kāpēc vecāki nevar pastumt malā vecāko un barot jaunāko?! Viņi mierīgi noskatās! Vai viņi pieļaus, ka dēļ vien bērna, otrs mirst badā?!
Sibling Rivalry
It’s been a tough few days at the nest as many have observed the aggressive actions of sibling rivalry. Survival of the fittest isn't a catch phrase in the Bald Eagle world, but necessary to continue their species. Sibling rivalry varies between nests -depending quite a bit on the amount of food provided. Even when food is abundant, it is not uncommon to see some sibling competition – lessons learned which will help them cope when they are on their own. In general, the first 20 days is when aggression is seen, but can be longer. As they get older, sibling rivalry lessens. There are no “bullies”, just eaglets trying to survive.
Parental interference between sibling aggression is uncommon although adults have been observed ending the aggression by merely stepping between the eaglets; by adopting a posture that suggests a feeding, but not presenting any real food; or begin brooding. Adults have even been seen to take hold of aneaglet’s beak to end the aggression.
Eagles live day to day with harsh realities that are completely normal to them. It brings new appreciation to nature when you see how these magnificent eagles survive in the wild.
We are observers & spectators; given the rare and unique opportunity to witness these eagles survive in the wild.
If you have any specific questions to the camera or events that have occurred, please use our moderated chat function on the viewing page. Our dedicated team of expert volunteers is available to help answer and educate viewers on the actions & developments occurring in the nest.
- The Southwest Florida Eagle Cam
Es arī nesaprotu, paši izglābat un tagad jāskatās, kā nabaga mazulis mokās.Raganiete wrote:Viss jau ir ļoti pareizi,gan par to,ka izdzīvo stiprākais,gan par neskatīšanos,tikai grūti saprast,kāpēc vispār vajadzēja to mazuli glābt,ja šāds iznākums bija paredzams.Skatīties to visu ir bezgala grūti,tāpēc jāsaņemas neskatīt šo kameru.
Tā ir karma. Vecākajam nāk atpakaļ tas, ka viņš tik skarbi izturējās pret jaunāko.Vērotāja wrote:Precīzi atkārtojas 2015. un 2014.gads. Mēs ar lianuliesmu arī tad pārstājām skatīties, jo tas nebija izturams. To varēja skatīties tikai roosaluristaja un dažreiz mums pakomentēja kas tur notiek.
Abus gadus kad agresija aizgāja tik tālu, ka likās, ka jaunākais teju aizies bojā, abus gadus pēkšņi mira vecākais bērns. Un abus gadus izdzīvoja tikai jaunākie.
Tas viss ir šīs tēmas sākumā. Ja ir interese, var palasīt pierakstus.