Nesting Activity and Clutch Size of Batagur affinis edwardmolli from the Setiu River, Terengganu, Malaysia

2011 ◽  
Vol 10 (1) ◽  
pp. 129-132 ◽  
Author(s):  
Eng-Heng Chan ◽  
Pelf-Nyok Chen
Keyword(s):  
Clutch Size ◽  
Nesting Activity

scholarly journals Drought Induced Nepotistic Behaviour in Indian Black Ibis (Pseudibis papillosa) Inhabiting the Arid Zone of Rajasthan, India

Our Nature ◽  
2009 ◽  
Vol 6 (1) ◽  
pp. 47-51
Author(s):  
K.C. Soni ◽  
A.N. Sharma ◽  
V.C. Soni
Keyword(s):  
Clutch Size ◽  
Kin Selection ◽  
Hatching Success ◽  
Arid Zone ◽  
Breeding Birds ◽  
Breeding Female ◽  
Fledgling Success ◽  
Reproductive Activities ◽  
Nesting Activity

Drought induced nepotistic behaviour in the Indian Black ibis (Pseudibis papillosa) inhabiting the arid zone of Rajasthan has been studied. The aim of the present study is to know about any breeding abnormalities induced in the Indian Black ibis by seasonal tragedy like drought. As such the nepotistic behaviour is not found in the Black ibis (Pseudibis papillosa) during normal season. Drought induces a reduced nesting activity and nepotistic behaviour in the Black ibis inhabiting arid zone. The helper birds (Non breeding birds of the own species) become active during drought to assist breeding pairs of Black ibis in various reproductive activities like feeding of breeding female, nestlings, fledglings and defending the nests. The role of helpers in breeding activities of Black ibis during drought also improves their clutch size, hatching success and fledgling success. The significance of the drought induced nepotistic behaviour in Black ibis in view of Hamilton’s theory of kin selection has been discussed.Keywords: Nepotistic behaviour, Black ibis, arid zone, Rajasthan, Indiadoi: 10.3126/on.v6i1.1654Our Nature (2008)6:47-51

Clutch frequency, egg and clutch characteristics, and nesting activity of spur-thighed tortoises, Testudo graeca, in southwestern Spain

1996 ◽  
Vol 74 (3) ◽  
pp. 560-564 ◽  
Author(s):  
C. Diaz-Paniagua ◽  
C. Keller ◽  
A. C. Andreu
Keyword(s):  
Clutch Size ◽  
Carapace Length ◽  
Individual Female ◽  
Testudo Graeca ◽  
Starting Date ◽  
Nesting Activity ◽  
Reproductive Variable ◽  
Nesting Season

Reproduction in female spur-thighed tortoises (Testudo graeca) in a population from southwestern Spain was studied by X-radiography of thread-trailed and radio-tagged individuals. Most females reproduce every year, laying one to four clutches from April to June with internesting intervals ranging from 21 to 29 days. Clutch size varied from 1 to 7 eggs and averaged 3.5 eggs. Carapace length and mass of females were positively correlated with the starting date and duration of the nesting season, while age was not correlated with any reproductive variable. Eggs averaged 33.87 × 27.97 mm in dimensions and 14.4 g in mass. Female mobility increased shortly before or after nesting, which resulted in wide dispersal of the various nests laid by an individual female.

scholarly journals Nest and Nidification Activities of the Spoonbill Platalea leucorodia in Westerghat Region of Shimoga, Karnataka

Our Nature ◽  
1970 ◽  
Vol 7 (1) ◽  
pp. 26-31
Author(s):  
G.Y. Dayananda ◽  
B.B. Hosetti
Keyword(s):  
Clutch Size ◽  
Site Selection ◽  
Nest Site ◽  
Nest Site Selection ◽  
Nest Size ◽  
Nesting Habitat ◽  
Nesting Material ◽  
Nesting Activity

Nest and nidification behaviour of the Spoonbill, Platlea leucorodia (Family- Threskiornithidae) was studied for three seasons during 2003-2005, at Gudavi Bird Sanctuary (GBS), Gudavi village, Sorab, Karnataka. The GBS harbored about 12 thousand birds of various species, of these, only 10-12 pairs of Spoonbills were breeds every year in this place. There were five Spoonbill nests, of which one was old egret nest and the four were newly built by Spoonbills. The clutch size was two to three in each nest (N = 5) and the shape of the egg was oval, white with small brown spots. The nesting activity usually starts in the month of late July and ends during December. The nesting activity, nest site selection, nesting habitat, nesting material, nest size, and nidification of Platalea leucorodia are discussed in this paper.Key words: Spoonbill, Platalea leucorodia, Nest and Nidification, Gudavi Bird Sanctuary,Shimoga.DOI: 10.3126/on.v7i1.2550Our Nature (2009) 7:26-31 

Reproductive patterns of the hawksbill turtle Eretmochelys imbricata in sandy beaches of the Yucatan Peninsula

2007 ◽  
Vol 87 (3) ◽  
pp. 815-824 ◽  
Author(s):  
Roberto Pérez-Castañeda ◽  
Alberto Salum-Fares ◽  
Omar Defeo
Keyword(s):  
Clutch Size ◽  
Yucatan Peninsula ◽  
Sandy Beaches ◽  
Main Peak ◽  
Eretmochelys Imbricata ◽  
Yucatán Peninsula ◽  
Emergence Success ◽  
Important Region ◽  
Long Term Trends ◽  
Nesting Activity

Daily censuses of the hawksbill turtle Eretmochelys imbricata were taken during the nesting seasons 1995–2001 in three sandy beaches of the Yucatan Peninsula, Mexico (Celestun, El Cuyo and Isla Holbox), to evaluate aspects of its reproductive biology. A total of 9059 hawksbill turtle clutches was estimated for the study period. Nesting seasons began in mid-April and ended in early September, peaking in May–June. No significant differences were detected in the mean number of clutches per km among beaches. The largest number of clutches was observed in the supralittoral zone (6341: 70%), followed by the dune (2491: 27.5%) and the intertidal (227: 2.5%) zones. Variation in number of clutches showed a main peak in 1999, decreasing in 2000 and 2001. A significant decrease (3 cm) in body size of nesting females was detected between 1995 and 2001. Mean clutch size was 140 eggs/clutch, and a significant positive relationship between curved carapace length and mean clutch size was found at the three beaches. Incubation period, hatching success and emergence success varied between years (lowest values in 1998) and beaches (highest values at Isla Holbox), with no significant differences between the supralittoral and dune zones. Even though there was no evidence of a decreasing trend in nesting activity for the study period, the decrease in 2000–2001 suggests that additional beach monitoring is necessary to identify long-term trends, and to reduce potential losses of nests by human and natural causes in this globally important region for the hawksbill turtle.

Is there an Optimal Clutch Size in Snow Geese?

1987 ◽  
Vol 130 (6) ◽  
pp. 839-863 ◽  
Author(s):  
R. F. Rockwell ◽  
C. S. Findlay ◽  
F. Cooke
Keyword(s):  
Clutch Size ◽  
Snow Geese ◽  
Optimal Clutch Size

scholarly journals Glucocorticoids, state-dependent reproductive investment and success in the face of danger in a long-lived bird

2020 ◽  
Author(s):  
Kristina Noreikienė ◽  
Kim Jaatinen ◽  
Benjamin B. Steele ◽  
Markus Öst
Keyword(s):  
Predation Risk ◽  
Telomere Length ◽  
Clutch Size ◽  
Body Condition ◽  
Nest Predation ◽  
Hatching Success ◽  
Reproductive Investment ◽  
Trade Off ◽  
Relative Telomere Length ◽  
Future Reproduction

AbstractGlucocorticoid hormones may mediate trade-offs between current and future reproduction. However, understanding their role is complicated by predation risk, which simultaneously affects the value of the current reproductive investment and elevates glucocorticoid levels. Here, we shed light on these issues in long-lived female Eiders (Somateria mollissima) by investigating how current reproductive investment (clutch size) and hatching success relate to faecal glucocorticoid metabolite [fGCM] level and residual reproductive value (minimum years of breeding experience, body condition, relative telomere length) under spatially variable predation risk. Our results showed a positive relationship between colony-specific predation risk and mean colony-specific fGCM levels. Clutch size and female fGCM were negatively correlated only under high nest predation and in females in good body condition, previously shown to have a longer life expectancy. We also found that younger females with longer telomeres had smaller clutches. The drop in hatching success with increasing fGCM levels was least pronounced under high nest predation risk, suggesting that elevated fGCM levels may allow females to ensure some reproductive success under such conditions. Hatching success was positively associated with female body condition, with relative telomere length, particularly in younger females, and with female minimum age, particularly under low predation risk, showing the utility of these metrics as indicators of individual quality. In line with a trade-off between current and future reproduction, our results show that high potential for future breeding prospects and increased predation risk shift the balance toward investment in future reproduction, with glucocorticoids playing a role in the resolution of this trade-off.

scholarly journals Temporal changes in reproductive success and optimal breeding decisions in a long-distance migratory bird

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Cynthia Reséndiz-Infante ◽  
Gilles Gauthier
Keyword(s):  
Reproductive Success ◽  
Clutch Size ◽  
Environmental Changes ◽  
Migratory Bird ◽  
Laying Date ◽  
Negative Consequences ◽  
Breeding Phenology ◽  
Additional Time ◽  
Long Distance ◽  
Seasonal Decline

AbstractMany avian migrants have not adjusted breeding phenology to climate warming resulting in negative consequences for their offspring. We studied seasonal changes in reproductive success of the greater snow goose (Anser caerulescens atlantica), a long-distance migrant. As the climate warms and plant phenology advances, the mismatch between the timing of gosling hatch and peak nutritive quality of plants will increase. We predicted that optimal laying date yielding highest reproductive success occurred earlier over time and that the seasonal decline in reproductive success increased. Over 25 years, reproductive success of early breeders increased by 42%, producing a steeper seasonal decline in reproductive success. The difference between the laying date producing highest reproductive success and the median laying date of the population increased, which suggests an increase in the selection pressure for that trait. Observed clutch size was lower than clutch size yielding the highest reproductive success for most laying dates. However, at the individual level, clutch size could still be optimal if the additional time required to acquire nutrients to lay extra eggs is compensated by a reduction in reproductive success due to a delayed laying date. Nonetheless, breeding phenology may not respond sufficiently to meet future environmental changes induced by warming temperatures.

Nesting activity of loggerhead turtles (2013–2020) and 20 years abundance trend (2001–2020) on Çıralı Beach, Turkey

2021 ◽  
Vol 44 ◽  
pp. 101758
Author(s):  
Bektaş Sönmez ◽  
Erdal Elginöz ◽  
Mustafa Ilgaz ◽  
Habib Altınkaya
Keyword(s):  
Loggerhead Turtles ◽  
Nesting Activity

Clutch Size in the Scincid Genus Emoia

Copeia ◽  
1968 ◽  
Vol 1968 (2) ◽  
pp. 417 ◽  
Author(s):  
Allen E. Greer
Keyword(s):  
Clutch Size
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