Factors affecting egg dimensions and breeding success in the Cory's Shearwater(Calonectris diomedea) of Selvagem Grande

1998 ◽  
Vol 139 (2) ◽  
pp. 179-184 ◽  
Author(s):  
Jean-Louis Mougin
Keyword(s):  
Breeding Success ◽  
Factors Affecting ◽  
Cory’S Shearwater ◽  
Calonectris Diomedea

scholarly journals Poaching vs. patrolling: effects on conservation of Cory’s Shearwater Calonectris diomedea borealis colonies

2011 ◽  
Vol 21 (3) ◽  
pp. 342-352 ◽  
Author(s):  
MARTA LOPEZ-DARIAS ◽  
JAVIER LUZARDO ◽  
RAFAEL MARTÍNEZ ◽  
DANIEL GONZÁLEZ ◽  
EDUARDO A. GARCÍA ◽  
...  
Keyword(s):  
Canary Islands ◽  
Breeding Success ◽  
Conservation Status ◽  
Negative Consequences ◽  
Negative Effects ◽  
Seabird Species ◽  
Cory’S Shearwater ◽  
Final Population ◽  
Calonectris Diomedea ◽  
Government Surveillance

SummaryNegative effects of poaching on seabird populations are not usually evaluated quantitatively when assessing seabird colony conservation status, nor are they generally considered a major concern. We demonstrate that poaching is still intense in the Canary Islands, and has negative consequences for the conservation of seabird colonies. We quantified the effects of poaching of Cory’s Shearwater fledglings on breeding success on different islands in the Canaries, comparing colonies that suffer from intense, medium, or no poaching. Poaching reduced the breeding success of affected colonies to almost a third, potentially causing the future extinction of the colony. Only colonies with intense wardening campaigns reached high values of reproductive success, showing that government surveillance in conjunction with volunteers from different NGOs is a very effective approach in reducing poaching. A population sensitivity analysis was also conducted to provide data on the factors that most affect the performance of the model. Although population growth and mean final population size varied with increases and decreases in mortality and carrying capacity, only harvesting resulted in a probability of 100% of extinction in 20–40 years. To promote seabird conservation in regions such as the Canary Islands, a core archipelago for seabird species in the Atlantic, poaching control should be elevated by society to a level of urgency, requiring dedicated funding and mobilisation of experts and volunteers to adequately address it through education, prevention and enforcement.

Genetic Relationships of Cory's Shearwater: Parentage, Mating Assortment, and Geographic Differentiation Revealed by DNA Fingerprinting

The Auk ◽  
2000 ◽  
Vol 117 (3) ◽  
pp. 651-662 ◽  
Author(s):  
Corinne Rabouam ◽  
Vincent Bretagnolle ◽  
Yves Bigot ◽  
Georges Periquet
Keyword(s):  
Genetic Variation ◽  
Genetic Structure ◽  
Dna Fingerprinting ◽  
Genetic Relatedness ◽  
Isolation By Distance ◽  
Genetic Relationships ◽  
Cory’S Shearwater ◽  
Genetic Structure Of Populations ◽  
The Social ◽  
Calonectris Diomedea

Abstract We used DNA fingerprinting to assess genetic structure of populations in Cory's Shearwater (Calonectris diomedea). We analyzed mates and parent-offspring relationships, as well as the amount and distribution of genetic variation within and among populations, from the level of subcolony to subspecies. We found no evidence of extrapair fertilization, confirming that the genetic breeding system matches the social system that has been observed in the species. Mates were closely related, and the level of genetic relatedness within populations was within the range usually found in inbred populations. In contrast to previous studies based on allozymes and mtDNA polymorphism, DNA fingerprinting using microsatellites revealed consistent levels of genetic differentiation among populations. However, analyzing the two subspecies separately revealed that the pattern of genetic variation among populations did not support the model of isolation by distance. Natal dispersal, as well as historic and/or demographic events, probably contributed to shape the genetic structure of populations in the species.

scholarly journals Costs of mating competition limit male lifetime breeding success in polygynous mammals

2014 ◽  
Vol 281 (1786) ◽  
pp. 20140418 ◽  
Author(s):  
Dieter Lukas ◽  
Tim Clutton-Brock
Keyword(s):  
Relative Intensity ◽  
Breeding Success ◽  
Male Fitness ◽  
Factors Affecting ◽  
Mating Competition ◽  
Species Comparisons ◽  
Intensity Of Competition

Although differences in breeding lifespan are an important source of variation in male fitness, the factors affecting the breeding tenure of males have seldom been explored. Here, we use cross-species comparisons to investigate the correlates of breeding lifespan in male mammals. Our results show that male breeding lifespan depends on the extent of polygyny, which reflects the relative intensity of competition for access to females. Males have relatively short breeding tenure in species where individuals have the potential to monopolize mating with multiple females, and longer ones where individuals defend one female at a time. Male breeding tenure is also shorter in species in which females breed frequently than in those where females breed less frequently, suggesting that the costs of guarding females may contribute to limiting tenure length. As a consequence of these relationships, estimates of skew in male breeding success within seasons overestimate skew calculated across the lifetime and, in several polygynous species, variance in lifetime breeding success is not substantially higher in males than in females.

Spontaneous Primary Right Tibiotarsal Osteosarcoma with Pulmonary Metastasis in a Free-Ranging Cory's Shearwater (Calonectris diomedea)

2020 ◽  
Vol 56 (1) ◽  
pp. 243
Author(s):  
Arícia Duarte-Benvenuto ◽  
Priscilla Carla dos Santos Costa ◽  
Hassan Jerdy ◽  
Eulógio Carlos Queiroz de Carvalho ◽  
José Luiz Catão-Dias ◽  
...  
Keyword(s):  
Pulmonary Metastasis ◽  
Cory’S Shearwater ◽  
Calonectris Diomedea ◽  
Free Ranging

ASPECTS OF THE BREEDING OF CORY'S SHEARWATER CALONECTRIS DIOMEDEA IN CRETE

Ibis ◽  
1977 ◽  
Vol 119 (3) ◽  
pp. 350-353 ◽  
Author(s):  
P. D. Round ◽  
R. L. Swann
Keyword(s):  
Cory’S Shearwater ◽  
Calonectris Diomedea
Sign in / Sign up

Export Citation Format

Share Document