1. Arrivals and occupation of the nest

Locked
marika.solo
Site Admin
Posts: 10249
Joined: 29 Sep 2021, 09:38

1. Arrivals and occupation of the nest

Post by marika.solo »

Arrivals and occupation of the nest - reserved

description
marika.solo
Site Admin
Posts: 10249
Joined: 29 Sep 2021, 09:38

Re: Arrivals and occupation of the nest

Post by marika.solo »

Arrivals and occupation of the nest - reserved

new sources (scientific - author: expert, specialist)
marika.solo
Site Admin
Posts: 10249
Joined: 29 Sep 2021, 09:38

Re: Arrivals and occupation of the nest

Post by marika.solo »

2018

Males, Females and Black Stork Nests: Who Owns What and Do They Hold Territories?

"Extensive ringing programme of Black Stork juveniles in Latvia started in 1990. Up until 2017, 1,603 juvenile storks had been ringed. In 2011, first remote sensing cameras were installed, and one of the nests has been permanently observed with a webcam since 2015. As of 2016, data from 20 cameras can be explored simultaneously. Obtained material comprises more than 1.2M pictures collected near 92 nests. From this material, more than 772K pictures from 41 nests, along with the videos filmed at two webcam-equipped nests, have been used for analyses of territorial behaviour and mate choice during the breeding season. In this talk, I discuss the validity of the widely explored concept of the "territorial” or “non-breeding pair" – a parameter that strongly affects all indices of productivity for any given territory. The data obtained exclusively from observations of ringed individuals with known sex and other individually identifiable birds suggest that this term is not relevant for Black Stork, consequently, all breeding success data should be reassessed. Similarly, the assumption that males own the nest appears not to be correct at least in some cases. The question whether it is true only for Storks in the surveyed range or characterises species as a whole should be the subject of a wider study over much larger territory in the future."

Strazds, M. (2018). Males, Females and Black Stork Nests: Who Owns What and Do They Hold Territories? - Oral presentation. In Cano-Alonso, Luis & Sundar, KS Gopi. (2018). IUCN-SSC Stork, Ibis and Spoonbill Specialist Group Special Publication 1. VII International Conference on Black Stork Ciconia nigra: programme and abstracts.
(https://storkibisspoonbill.org/wp-conte ... tracts.pdf - p.14)
marika.solo
Site Admin
Posts: 10249
Joined: 29 Sep 2021, 09:38

Re: Arrivals and occupation of the nest

Post by marika.solo »

2019

New data on partner choice and nest ownership in black stork (Ciconia nigra)

Extensive ringing programme of black stork juveniles in Latvia started in 1990. Up until 2018, 1833 juvenile storks had been ringed. In 2011, first remote sensing cameras were installed, and one of the nests has been permanently observed with a webcam since 2015. As of 2016, data from 20 cameras can be explored simultaneously. From this material, more than 772K pictures from 41 nests, along with the videos filmed at two webcam-equipped nests, have been used for analyses of territorial behaviour and mate choice during the breeding season in Latvia. Initial analysis of these data obtained exclusively from observations of ringed individuals with known sex and other individually identifiable birds suggest that the term “non-breeding pair” is not relevant for black stork. Similarly, the assumption that males „own”the nest appeared not to be correct at least in some cases. Here we have expanded the data set with satellite data tracking adult black storks from Czech Republic (1995–2001) and Estonia (2006–2018), accompanied with webcam and/or remote sensing camera data near relevant nests to see whether it characterises species as a whole. Comparison of various data sets does not contradict those findings; however, they indicate remarkable differences between individuals of the same sex in regard to site tenacity. One of important findings is that the non-breeding individuals can explore several nests at remarkable distance (up to 200 km) during the same breeding season. We shall also discuss possible reasons of site and partner change between seasons.

Māris Strazds, František Pojer, Urmas Sellis, Ülo Väli (2019) New data on partner choice and nest ownership in black stork (Ciconia nigra)
in 2th European Ornithologists’ Union Congress, 26 – 30 August 2019, Cluj Napoca, Romania, Programme and Abstracts, Edited by Erik Matthysen, Péter L. Pap, Gábor M. Bóné
(http://conference.eounion.org/wp-conten ... tracts.pdf - p.129)

Solitude at periphery: lack of partners limits reproduction of the Black Stork (Ciconia nigra) at the marginof the distribution range

Abstract: Understanding the mechanisms forming species’ ranges is a central ecological question, which could be answered by analysing factors limiting peripheral populations. In threatened species, such studies are essential for establishing effective conservation measures across the range. We analysed factors potentially influencing breeding in a declining peripheral population of a long-lived bird, the Black Stork (Ciconia nigra). We assessed re-
productive success and the effects of intra- and interspecific competition, as well as predation by recording events at nests by remote cameras (camera traps and a webcam). Productivity of storks was low (1.1 fledglings per occupied nest) compared to the other parts of the range and resulted mainly from the lower proportion of successful nests (37% of occupied nests). The main reason for low breeding success was the occupancy of many nests (35%) by single non-reproductive birds. Breeders were often visited by non-local con-specifics, which harassed local birds but only seldomly caused direct damage. Impact of predators and interspecific nest-competitors on reproductive success was low. We suggest that many individuals have disappeared from the breeding population and shortage of mates is currently the most important factor lowering reproductive success of the Black Stork at its northern range margin. This mechanism could also limit the peripheral abundance and distribution in other long-lived birds.

Konovalov, Annika & Nellis, Rein & Nellis, Renno & Nurmla, Ain & Sellis, Urmas & Väli, Ülo. (2019). Solitude at periphery: lack of partners limits reproduction of the Black Stork (Ciconia nigra) at the margin of the distribution range. Ornis Fennica 96 (1): 13–23.
(https://www.ornisfennica.org/pdf/latest/19Konovalov.pdf)
marika.solo
Site Admin
Posts: 10249
Joined: 29 Sep 2021, 09:38

Re: 1. Arrivals and occupation of the nest

Post by marika.solo »

2020

Nest-site selection by the white-tailed eagle and black stork – implications for conservation practice.

Abstract
Our results indicate different nesting preferences, with the eagles entirely confining themselves to Scots pine (Pinus sylvestris L.) – a species also chosen by black storks, which nevertheless regularly favour pedunculate oak (Quercus robur L.). Both species select trees of greater girth than the random ones, but white-tailed eagles choose to nest in the vicinity of patches of mature old stands with a loose canopy, to the extent that nesting trees and surrounding trees are of similar ages. In contrast, black storks prefer “veteran” trees with low-set crowns that are much older than any others in their vicinity. Nesting trees of the eagles are away from roads and close to lakes, while black storks do not avoid roads.

Conclusions
As the ages of nesting trees of both species are greater than ages at final cutting in this region’s managed forest, silvicultural measures will need to be adjusted, with small patches of forest spared, or larger areas as “islands” of old-growth. Likewise, as tending and thinning are engaged in, certain trees with horizontal branches will need to remain, with relict trees also left untouched. As it happens, all of these recommendations are anyway key elements of close-to nature silviculture and multifunctional forestry.

Zawadzki G, Zawadzka D, Sołtys A, et al. Nest-site selection by the white-tailed eagle and black stork – implications for conservation practice. Forest Ecosystems, 2020, 7(4): 59. https://doi.org/10.1186/s40663-020-00271-y
https://rdcu.be/dxjdW
Locked

Return to “Black storks - nesting”