Factors affecting offspring growth and daily nest survival rates in the coastal breeding Western Reef Heron (Egretta gularis) in the Persian Gulf

2014 ◽  
Vol 36 (3) ◽  
pp. 379-388 ◽  
Author(s):  
Farzaneh Etezadifar ◽  
Ahmad Barati
Keyword(s):  
Persian Gulf ◽  
Nest Survival ◽  
Survival Rates ◽  
Factors Affecting ◽  
Offspring Growth ◽  
Daily Nest Survival ◽  
The Persian Gulf

scholarly journals Effects of storms, angling, and nest predation during angling on smallmouth bass (Micropterus dolomieu) nest success

2005 ◽  
Vol 62 (11) ◽  
pp. 2649-2660 ◽  
Author(s):  
Geoffrey B Steinhart ◽  
Nancy J Leonard ◽  
Roy A Stein ◽  
Elizabeth A Marschall
Keyword(s):  
Nest Predation ◽  
Lake Erie ◽  
Nest Success ◽  
Nest Survival ◽  
Survival Rates ◽  
Round Goby ◽  
Smallmouth Bass ◽  
Micropterus Dolomieu ◽  
Daily Survival ◽  
Daily Nest Survival

We studied how storms, angling, and nest predation during angling affected smallmouth bass (Micropterus dolomieu) nest survival in the Bass Islands, Lake Erie, Ohio, USA. Increasing angler effort and introduction of an exotic nest predator, round goby (Neogobious melanostomus), have raised concerns about smallmouth bass recruitment in Lake Erie. We surveyed smallmouth bass nests and calculated daily survival rates for nests assigned to different angling treatments: control, angling without predation, or angling with predation treatments. Only 30% of control nests were successful compared with 11% of angling without predation and 14% of angling with predation treatments. We used the Mayfield method and maximum likelihood models in the program MARK to estimate the survival rates for nests of different treatments and exposed to different numbers of storms. Although nest predators consumed about 35% of broods during angling, daily nest survival rates of both angling treatments were similar. Angling reduced nest survival compared with controls by approximately 5%. Storms reduced both nest success and daily survival. The best model predicting daily nest survival included the added effects of angling treatment and number of storms. Thus, whereas storms and angling affected smallmouth bass nest survival, nest predation during angling did not.

scholarly journals Revisiting Effects of Hunting on Mourning Dove Nest Survival

2019 ◽  
Vol 10 (1) ◽  
pp. 102-110
Author(s):  
John H. Schulz ◽  
Xiaoming Gao ◽  
Peng Shao ◽  
Zhuoqiong He ◽  
Joshua J. Millspaugh
Keyword(s):  
Nest Survival ◽  
Survival Rates ◽  
Mourning Dove ◽  
Hunting Season ◽  
Basic Premise ◽  
Survival Estimate ◽  
Zenaida Macroura ◽  
Bayesian Hierarchical ◽  
Credible Intervals ◽  
Daily Nest Survival

Abstract We reconstructed a historical dataset from a national mourning dove Zenaida macroura nesting study evaluating the effects of hunting on nesting birds during the September portion of the hunting season using Bayesian hierarchical models; the reconstructed dataset contained 707 nests. The original nest survival estimate of 96.3% (nonhunted zones) fell within the range of our average daily nest survival rates and credible intervals (CI) of 97.2% (95% CI: 96.2–98.0%) for nonhunted, but the original nest survival estimate of 95.5% (hunted zones) was lower than our average daily nest survival rates of 96.9% (95% CI: 96.1–97.7%) for hunted zones. Similarly, overall nest survival for areas and years combined for hunted zones was 44.3% (95% CI: 35.3%, 53.9%) and 48.1% (95% CI: 36.9%, 59.8%) for nonhunted zones. The most parsimonious model contained the primary covariates of hunted or nonhunted status (hunted or paired hunted) or paired hunted or nonhunted nest searching plot (zone), and year. We observed lower nest survival for the hunted or delayed-hunt zones compared to the zones with hunted or nonhunted season structure. Regional differences may be explained by states with early and late hunting seasons separated by ≥ 21 d compared to other pairs where hunted and nonhunted areas occurred simultaneously. Our reanalysis provides managers additional assurance that the basic premise of limited or no effect of harvest on mourning dove populations is still valid but continued monitoring of population status is warranted.

scholarly journals Green-Tailed Towhee Response to Prescribed Fire in Montane Shrubland

The Condor ◽  
2006 ◽  
Vol 108 (3) ◽  
pp. 634-646
Author(s):  
Gretchen Jehle ◽  
Julie A. Savidge ◽  
Natasha B. Kotliar
Keyword(s):  
Prescribed Fire ◽  
National Park ◽  
Prescribed Burning ◽  
Nest Survival ◽  
Survival Rates ◽  
Rocky Mountain ◽  
Nest Site Selection ◽  
Rocky Mountain National Park ◽  
Shrub Cover ◽  
Daily Nest Survival

Abstract Fire alters the structure and composition of shrublands and affects habitat quality for the associated avifauna. Because shrubland ecosystems have been greatly reduced from their original extent in western North America and fire is increasingly being used to manage these landscapes, a better understanding of how fire affects the associated vegetation and wildlife is imperative. We evaluated the response of Green-tailed Towhees (Pipilo chlorurus) to prescribed fire in the montane shrublands of Rocky Mountain National Park, Colorado during 2002 and 2003. Three to five years following prescribed burning, Green-tailed Towhee density and shrub cover were generally higher in unburned areas. Nests (n  =  179) were located in unburned vegetation; within burned sites, all nests were in remnant patches. Green-tailed Towhee nest survival was 57% (95% CI  =  49%–65%) across the two years of the study. More than half of the nests were in common juniper (Juniperus communis) shrubs, and nest survival was higher for nests in junipers than those in other shrub species. Daily nest survival rates were lower at the site with the highest density of towhees and declined over the breeding season. With regard to shrub cover, opposite trends were observed for nest-site selection and nest survival: nest plots had greater shrub cover than non-nest plots, but nest survival decreased with increasing shrub cover. Because shrub cover affects towhee density and nest survival in conflicting ways, fire management at Rocky Mountain National Park alters both habitat availability and suitability for Green-tailed Towhees.

Forest edges negatively influence daily nest survival rates of a grassland tinamou, the Spotted Nothura (Nothura maculosa)

2021 ◽  
Author(s):  
Martín A. Colombo ◽  
Luciano Noel Segura
Keyword(s):  
Nest Survival ◽  
Survival Rates ◽  
Breeding Population ◽  
Egg Laying ◽  
Forest Edges ◽  
Habitat Features ◽  
Exotic Trees ◽  
Cause Of Failure ◽  
Daily Nest Survival ◽  
Ground Nesting

Grassland degradation and fragmentation produced by land use have globally impacted biodiversity. In the Neotropics, the Pampas Grasslands have been greatly altered by agriculture and the introduction of exotic trees. To evaluate the effects of changing habitat features on native grassland fauna, we studied a breeding population of a ground nesting bird, the Spotted Nothura Nothura maculosa (Temminck, 1985) in a natural grassland under cattle-grazing in central-east Argentina. We estimated daily nest survival rate (DSR) and modeled it as a function of habitat (distance to habitat edges, cattle density and nest concealment) and temporal factors. Of the 80 nests found, 64 (80 %) failed, predation being the principal cause of failure. DSR was 0.874, estimating a cumulative survival of only 6.8 % throughout egg laying and incubation. DSR increased with distance to continuous forests and decreased with nest age. Nests located near forest edges could have increased predation risk because they are potentially exposed to forest dwelling predators in addition to grassland dependent ones. Considering the low success found and the ongoing invasion of exotic trees in the region, we encourage governments to protect large areas of grassland that ensure adequate nest success for tinamous and other ground nesting birds.

scholarly journals Study of Factors Affecting Saudi-Iranian Relations and Conflicts and Their Resulting Behavior Pattern

2016 ◽  
Vol 9 (7) ◽  
pp. 178
Author(s):  
Mahdi Alikhani ◽  
Mehdi Zakerian
Keyword(s):  
Saudi Arabia ◽  
Persian Gulf ◽  
Behavior Pattern ◽  
Mediterranean Area ◽  
Conflict Behavior ◽  
Gulf Region ◽  
Factors Affecting ◽  
Islamic Identity ◽  
Distribution Of Power ◽  
The Persian Gulf

Relations between Tehran and Riyadh as two key players and two regional powers are of great importance. Special place of the two countries has caused relations between them to be very important in the formation of regional order in the Persian Gulf, the Middle East and Mediterranean area. Different behavior patterns in their relationship have taken place from the beginning of the relationship till now. After domestic, regional and international developments in 1999, Tehran and Riyadh went from divergence to the détente, coexistence and cooperation during the presidency of Hashemi Rafsanjani and Mohammad Khatami. However, since 2005 these two great neighboring countries again entered the competition, tensions and divergences. In this descriptive study, by using library method and reviewing online available resources conducted on Saudi-Iranian relations, our purpose is to investigate what were the effective factors in shaping the relations and conflicts between Iran and Saudi Arabia before the time Saudi Arabia cut diplomatic relations with Iran over the storming of the Saudi embassy in Tehran, and what behavior pattern these factors led to? According to results we found out that <em>identical</em>, <em>geopolitical</em>, and <em>structural</em> factors were the determinant factors in creating relations and conflicts between the two countries. Identity of Iran's political system is referred to Iranian-Islamic identity, while Saudi Arabia has Arabic-Islamic identity. Their geopolitical distinctions are related to Shiite and Sunni disciplines, and in terms of structure, rapprochement with U.S. and distribution of power in the Persian Gulf region are the most important indicators. These factors formed a “competitive conflict” behavior pattern among them.

Daily nest survival rates of Gunnison Sage-Grouse (Centrocercus minimus): assessing local- and landscape-scale drivers

2015 ◽  
Vol 127 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Thomas R. Stanley ◽  
Cameron L. Aldridge ◽  
D. Joanne Saher ◽  
Theresa M. Childers
Keyword(s):  
Nest Survival ◽  
Survival Rates ◽  
Landscape Scale ◽  
Sage Grouse ◽  
Centrocercus Minimus ◽  
Daily Nest Survival
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