Theodoros Naziridis - Academia.edu (original) (raw)

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Papers by Theodoros Naziridis

Avian research, Feb 1, 2024

BWP UpdateBWP Update, 1997

Monitoring and Conservation of Birds, Mammals and Sea Turtles of the Mediterranean and Black Seas, Proceedings of the 5th Medmaravis Symposium, 1988

Managing Mediterranean Wetlands and their birds., 1992

Book of Abstracts. 10th International Congress on the Zoogeography and Ecology of Greece and Adjacent Regions, 2006

Rivista Italiana di OrnitologiaRivista Italiana di Ornitologia, 1991

Ethology Ecology & Evolution

Science

Comparative studies of mortality in the wild are necessary to understand the evolution of aging; ... more Comparative studies of mortality in the wild are necessary to understand the evolution of aging; yet, ectothermic tetrapods are underrepresented in this comparative landscape, despite their suitability for testing evolutionary hypotheses. We present a study of aging rates and longevity across wild tetrapod ectotherms, using data from 107 populations (77 species) of nonavian reptiles and amphibians. We test hypotheses of how thermoregulatory mode, environmental temperature, protective phenotypes, and pace of life history contribute to demographic aging. Controlling for phylogeny and body size, ectotherms display a higher diversity of aging rates compared with endotherms and include phylogenetically widespread evidence of negligible aging. Protective phenotypes and life-history strategies further explain macroevolutionary patterns of aging. Analyzing ectothermic tetrapods in a comparative context enhances our understanding of the evolution of aging.

The cormorant's (Phalacrocorax carbo, L. 1758) and pygmy cormorant’s (Phalacrocorax pygmaeus,... more The cormorant's (Phalacrocorax carbo, L. 1758) and pygmy cormorant’s (Phalacrocorax pygmaeus, P. 1773) biology reproduction has been studied at the wetland of the artificial lake of Kerkini in north Greece from 1988 to 1990. From the beginning of the 80's, the location of the main colony changes four times, because of the tree and bush necrosis and attenuation in the corresponding regions. From 1993, the birds started to use the part of the riparian forest at the river's west bank, next to its embouchure into the lake, which is the main colony of the lake. From 1996, some individuals started to nest in a new location, at the eastern bank of the river. The depth of the water at the colony area during the three years of study, varied from 1,0 m at the start of laying egg period, up to 3,0 m in the middle of the reproductive period. The first couples of pygmy cormorant’s arrived in the colony in the mid-March and made their nests. The egg-laying started from 25-30 of March ...

Endangered Species Research, 2015

The Dalmatian pelican (DP) Pelecanus crispu s and the great white pelican (GWP) Pelecanus onocrot... more The Dalmatian pelican (DP) Pelecanus crispu s and the great white pelican (GWP) Pelecanus onocrotalus are listed as 'Vulnerable' and 'Least Concern', respectively, in the IUCN Red List. We present an updated estimation of the Black Sea / Mediterranean flyway population status of both species, based on data provided by experts working in all 7 countries of the region where pelicans breed and/or overwinter, who came together at the 1st Workshop on Pelican Research and Conservation in Prespa, Greece. The DP breeding population in the Black Sea and Mediterranean countries increased from 1730−2105 pairs in the years 2000−2010 to 2154−2437 pairs in 2011−2012. Approximately 40% of the Palaearctic breeding population of GWP occurred in Southeast Europe and Turkey. In 2011−2012 the GWP population in this region was estimated to be 4702−5175 pairs, and has remained more or less stable during the last decade. Although all the breeding sites for both species are in protected areas, disturbance at nesting places was considered to be the main threat. Direct persecution and electric power lines still cause occasional problems. In deltaic lagoons, erosion and inundation of nesting sites cause breeding failures in DPs, while in inland wetlands large water level fluctuations are a widespread problem. Decrease of fish stocks is a threat, especially in coastal areas. Many stopover wetlands along GWP migration routes between Southeast Europe and Africa have been seriously degraded or have disappeared, resulting in serious implications for their populations. Conservation needs are listed, but further research is recommended for both species.

Cormorants arrd destructiorr of breeding colonies has ditninished, many birds are still killed in... more Cormorants arrd destructiorr of breeding colonies has ditninished, many birds are still killed in hshing nets and disturbance of breeding colonies still occurs frequently. Our lack of g,eneral knowledge oll this specics hampers our ability to take good and cfficicnt management and conservation measures.

Out of today's number of bird species, estimated to be around 10,000, the populations of 1,111 sp... more Out of today's number of bird species, estimated to be around 10,000, the populations of 1,111 species (a percentage of approximately 11%) are threatened with extinction. If the species whose populations are characterised as "nearly threatened" are added on top of them (9% of the avifauna) together with the species for which there are not sufficient data (1% of the avifauna), then one fifth of the global number of the avifauna may be considered as threatened with extinction. Most of these species are endemic and distributed in remote areas, particularly in the tropics. The majority of the threatened species are forest dwellers (65%), whereas wetland species constitute 8.8% of all threatened species. Nevertheless, even out of the remaining 80% of species, which are currently registered as safe, several have lost up to one third of their populations during the last 20 years.