Protective Nest Design for Indian House Sparrow (Passer domesticus L.) - with Reference to Predation and Reuse

Background: The House Sparrow (Passer domesticus L.), is a human-commensal bird species, belonging to the order Passeriformes. The rapid changes in our lifestyle resulted in the decrease of this bird population during the past four decades. Among the various causes viz., lack of food resources, pollution pressure, indiscriminate usage of pesticides etc. Habitat loss is found to be one of the main threats for their rapid decline. Installation of artificial nest boxes was found to be the best alternatives for raising the bird population. Methods: Jangareddigudem of West Godavari district, Andhra Pradesh, India, was chosen as the study area. The nest boxes were designed by incorporating certain modifications to the basic model specified by British Trust of Ornithology. Installation of the nest boxes was initiated from an area with moderate food resources, located towards south-west edge of the town and was expanded in to other areas in a latitudinal wise towards north and south directions. Data was collected on a regular basis to study the occupancy of the nest boxes by the house sparrows. Result: The model designed was proved to be protective from predators and also well accepted by the public. Out of 570 nests that were installed in the study area, 550 nests were occupied and being used for breeding, that comes to around 97.6% occupancy indicating the suitability and protectiveness of this model. The sparrow population in the study area has been increased with a count of sparrows from few to 300+ sparrows at each roosting site (two roosting sites) by the end of 2020 by utilizing the nest boxes.

Nest-site selection and nest design of Iberian bullfinches Pyrrhula pyrrhula iberiae in northwestern Spain

Nest-habitat selection and nest design in a Eurasian bullfinch population in the Iberian Peninsula are thoroughly addressed in this study for the first time. Hedgerows and meadows were found around all of the nests and most of them were supported by hedgerows, so bullfinches consistently used the general woody vegetation available as reproduction habitat and site. Also, poplar plantations appeared preferentially in the immediate surroundings of the nests. Partly reflecting these results, bullfinches chose zones with greater shrub and tree cover than that available. Bullfinches placed their nests on a wide variety of plant species, but showed predilection for thorny species. Overall mean height of nests above the ground was 1.43 m and large-sized shrubs/trees were preferred. The most predominant bullfinch nest orientations were S, E and centered, which arguably provided thermal benefits and protected from severe weather. In general, there were no significant temporal variations in nest-site selection. With the exception of thorny support and favourable orientation, acting jointly, there was no significant association between nest-site characteristics and nesting success, presumably because many nests were already located in the most advantageous places at each time, and because despite this, predation pressure was high. Nest external dimensions were relatively variable, whereas internal width was the least variable nest dimension. No significant monthly or interannual variations in nest weight were observed. Larger nests did not hold larger clutches. Successful nests were larger than unsuccessful ones. The bullfinch nests were of simple construction, with two clearly different regions, the outer nest and the internal cup, with no significant temporal variations in the weight of either. The outer, structural nest consisted mainly of twigs, whereas roots and herbaceous shoots were the highest fractions lining the cup. Hair was the only animal-derived material used by bullfinches.

Kajian Sifat Fisikokimia Permen Jelly oleh Tiga Varietas Jahe (Zingiber officinale) dan Perbedaan Konsentrasi Ekstrak Karagenan dari Rumput Laut (Eucheuma cottoni)

Ginger is one type of medicinal plants and spice, which has been known by the Indonesian people. Usefulness of ginger suchas for seasoning, mixed food/drink, medicines and cosmetics. Ginger has a distinctive aroma due to essential oil content and a specific flavor that is spicy derived from oleoresin compounds. Consumption continuously is excellent for health. Ginger has a spicy flavor is difficult to fresh, it needs to be inovaded. In this research ginger is processed into jelly candy. Jelly candies require a gel-forming material to form a chewy texture. In this research, the gel-forming material is used in the Caragenan. The Caragenan is exported using a solution of KOH 10%. This research aims to determine the effect of ginger varieties against the brightness of jelly candies, antioxidants, flavors and aromas, knowing the influence of the addition. The research was conducted in two phases. The first phase of the extraction of carrageenan from seaweed Euchema cottoni used a solution of KOH 10%. Caragenan extract is further analyzed for yield, moisture content, viscosity and gel strength. The second stage was making ginger jelly candy production with difference of caragenan concentration using nest design (Nested). The parent factor of three varieties of ginger is ginger elephant, red ginger and ginger emprit, while the concentration of caragenan, 7 grams, 8 grams and 9 grams. The analyzed parameters were water content, water content, sugar reduction, antioxidant, texture, color , pH and organoleptic (texture, aroma, color and flavor). The results showed that three varietas of ginger affect the brightness of jelly sweets, antioxidants, flavors and aromas. Best was results obtained at the treatment of Ginger Javanese with the addition of a 9 g caragenan with 82.331% of antioxidant activity, 4.835 N of texture, 13.132% of water content, 4.9 (strong) of organoleptic Aroma, 4.5 (supple) of organoleptic texture, and 4.6 (spicy) of flavor.

How a Superorganism Evolves

Superorganisms are reverse-engineered by natural selection. The totality of the organizational structure of a colony, its colony-level phenotype, is exposed to natural selection. Those colonies with phenotypes that are best adapted to their environment survive best and reproduce the most reproductive offspring. The heritable features of those colony phenotypes increase in frequency in the next generation, and the population evolves a social organization. Natural selection doesn’t “see,” doesn’t act on, the individual components of organization, only the gross product. Therefore, the intricacies of the design, such as reduced fertility of workers, nest design and maintenance, and defensive behavior, are reverse-engineered. They evolve as a consequence of their effects on the whole colony.

It’s not all about temperature: breeding success also affects nest design

There are numerous observational studies on intraspecific variation in avian nest building and a single experimental manipulation. The general consensus is that birds build nests in response to environmental conditions, but it is not clear whether such flexibility in nest building is reproductively advantageous. To test the relationship between building flexibility and reproductive success, we allowed captive zebra finches to build their first nest, using string, and to breed in temperature-controlled rooms held at 14 or 30 °C. Once the offspring had fledged, we returned half the pairs to breed at the same temperature while half the pairs were switched to the alternative temperature. We provided all pairs with string and left them to build and breed a second time. For their first nest, pairs that built at 14 °C used more string than did pairs that built at 30 °C, and pairs that bred successfully built a nest with more string than did unsuccessful pairs. When pairs built their second nest, however, temperature no longer explained the number of pieces of string they used; rather, irrespective of the ambient temperature, pairs that had successfully produced young from their first nest used the same amount of string for their second nest, whereas those that had failed to reproduce with their first nest used more string. These latter pairs were then more likely to reproduce successfully. Ambient temperature, therefore, did affect the nest the pairs built but only in the absence of reproductive experience.

How Birds Behave

Birds are intelligent, sociable creatures that exhibit a wide array of behaviours – from mobbing and mimicking to mating and joint nesting. Why do they behave as they do? Bringing to light the remarkable actions of birds through examples from species around the world, How Birds Behave presents engaging vignettes about the private lives of birds, all explained in an evolutionary context. We discover how birds find food, relying on foraging techniques, tools and thievery. We learn about the courtship rituals through which birds choose, compete for, woo and win mates; the familial conflicts that crop up among parents, offspring and siblings; and the stresses and strains of nesting, including territory defence, nepotism and relationship sabotage. We see how birds respond to threats and danger – through such unique practices as murmurations, specific alarm calls, distraction displays and antipredator nest design. We also read about how birds change certain behaviours – preening, migration, breeding and huddling – based on climate. Richly illustrated, this book explores the increasing focus on how individual birds differ in personality and how big data and citizen scientists are helping to add to what we know about them. Drawing on classic examples and the latest research, How Birds Behave offers a close-up look at the many ways birds conduct themselves in the wild.

Conformity to Bergmann’s rule in birds depends on nest design and migration

Species’ geographic ranges and range limits are thought to be determined by climate, and across climatic gradients the morphology of populations varies non-randomly. Ecogeographic rules seek to characterise such variation, with Bergmann’s rule positing that organisms inhabiting colder environments are typically larger-bodied than those inhabiting warmer environments. While Bergmann’s rule has been supported across a range of taxonomic groups, how organisms’ behaviour may moderate its effect remains unclear. Here we investigate whether conformity to Bergmann’s rule among birds of the Western Palearctic varies in relation to nest design and migratory behaviour, using phylogenetic comparative analyses. We test predictions using data on nest structure and location, migration, body mass, latitudinal distribution, annual mean temperature and phylogenetic relatedness for a sample of >500 species. We find that conformity to Bergmann’s rule depends strongly on migratory behaviour: non-migratory species breeding at colder, more northerly latitudes are larger-bodied, while body mass is unaffected by climate in short- and long-distance migrants. Among non-migratory species, conformity to Bergmann’s rule depends, further, on nest design: species with more open nests, who are thus most exposed to adverse climatic conditions while breeding, conform most strongly to Bergmann’s rule. Our findings suggest that enclosed nesting and migration allow smaller bodied species to breed in colder environments than their body size would otherwise allow. Therefore, we conclude that organisms’ behaviour can strongly affect exposure to environmental selection pressures.

Differences in Pre-Laying Behavior between Floor-Laying and Nest-Laying Pekin Ducks

Floor-laying in commercially farmed Pekin ducks is not well understood. This exploratory study aimed to determine if behavioral differences exist between floor-laying and nest-laying ducks. Retrospective analysis of video footage from a small commercial breeding flock (n = 60 birds) was used to quantify the behavior of floor-laying and nest-laying birds (n = 24 events per group) in the hour prior to oviposition site selection. The frequency, percentage of time spent, and duration of bouts were compared for nest box interactions, behaviors inside and outside of boxes and aggressive interactions. Some floor-laying birds did not enter or investigate nest boxes (FL-Out), whilst some floor-layers (FL-In) used nest boxes similarly to nest-laying birds (NL). Nest-building behavior differed only in location, with FL-Out performing the behavior on the shed floor and the other groups performing it primarily in boxes. FL-Out sat more, walked less, and engaged in less aggression (p < 0.05) than FL-In and NL. The occurrence of multiple birds in a nest box was strongly correlated with the number of aggressive interactions that occurred in the box (R = 0.81). Competition appears to contribute to floor-laying in Pekin ducks; FL-Out birds may not engage with nest boxes as a coping strategy to avoid agonistic behavior. These findings indicate that developing practical strategies to reduce nest box competition could help mitigate floor-laying. However, other factors such as nest design may also contribute to FL-Out birds’ reluctance to use nest boxes and require further investigation.