A comparison of bird communities in the anthropogenic and natural-tree fall gaps of a reduced-impact logged subtropical forest in Bolivia

AbstractWe studied bird community composition and abundance within four vegetation and disturbance categories located within selectively logged and unlogged forest in a Bolivian subtropical lowland forestry concession. The logged forest was subject to reduced-impact logging between 1 and 4 years prior to our study. The four categories were: 1) ‘gap’ points possessing natural or anthropogenic tree-fall gaps; 2) ‘target’ points with one of five commercial tree species of harvestable size; 3) ‘future’ points possessing a commercial tree below harvestable size and 4) ‘non-target’ points not possessing harvestable tree species. The bird community composition of logging gaps significantly differed from that found within natural tree-fall gaps in the unlogged forest P< 0.05. Species richness was higher in natural tree-fall gaps than in anthropogenic gaps. Furthermore, a higher proportion of disturbance sensitive species were associated with natural-tree fall gaps, whereas a higher proportion of disturbance tolerant species were associated with anthropogenic gaps. No significant difference was detected in the bird community composition for the other three vegetation categories surveyed. We discuss the conservation and silvicultural repercussions of these results.

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Birds surveyed in the harvested and unharvested areas of a reduced-impact logged forestry concession, located in the lowland subtropical humid forests of the Department of Santa Cruz, Bolivia

Check List ◽

10.15560/3.1.43 ◽

2007 ◽

Vol 3 (1) ◽

pp. 43 ◽

Cited By ~ 1

Author(s):

Adam Felton ◽

Bennett A. Hennessey ◽

Annika M. Felton ◽

David B. Lindenmayer

Keyword(s):

Community Composition ◽

Bird Species ◽

Bird Community ◽

Font Size ◽

Santa Cruz ◽

Wet Season ◽

Point Count ◽

Logging Effects ◽

Logged Forest ◽

Reduced Impact Logging

As part of a larger study of reduced-impact logging effects on bird community composition, we surveyed birds from December to February during the 2003-2004 wet-season within harvested and unharvested blocks of the La Chonta forestry concession, Department of Santa Cruz, Bolivia. The logged forest was harvested using reducedimpact logging techniques between one and four years previously. During point count surveys, we identified 5062 individual birds, belonging to 155 species, and 33 families. We provide a list of bird species found within the harvested and unharvested blocks of the concession for the benefit of other researchers assessing the responses of Neotropical avifauna to disturbance, and to facilitate increased understanding of the diverse bird assemblages found within the lowland subtropical humid forests of Bolivia.

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Conserving native trees increases native bird diversity and community composition on commercial office developments

Journal of Urban Ecology ◽

10.1093/jue/juaa033 ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Karen Dyson

Keyword(s):

Community Composition ◽

Environmental Gradients ◽

Bird Species ◽

Bird Community ◽

Bird Communities ◽

Bird Diversity ◽

Bird Conservation ◽

Tree Protection ◽

Matrix Habitat ◽

Site Use

Abstract In cities, woody vegetation provides critical shelter, nesting and foraging habitat for bird species of interest. Human actions—including development and landscaping choices—determine vegetation community composition and structure, making these choices critically important to urban bird conservation. A better understanding of how bird communities are impacted by parcel-scale actions can help guide policy and management best practices to improve matrix habitat quality and quantity. Here, I examined how bird habitat use varies along a vegetation gradient created by different development and landscaping choices. I surveyed 20 commercial office developments near Seattle in the Puget Trough region of Washington, USA selected using stratified random sampling, where I quantified bird communities and observed feeding behavior. I used GLMM and PERMANOVA models with data likelihood metrics to identify the best supported variables for bird site use, along with TITAN models to identify changes in community composition along environmental gradients. I found that measures of bird effective species richness and bird community are positively influenced by the presence of more native conifers, including the presence of a stand predating development and the height and density of native conifers. Measures of the native bird community are negatively influenced by higher non-native tree density. In contrast to prior research, top-down landscape-scale variables did not explain variation in measures of the bird community on office developments. Importantly, I found that birds are associated with the same habitat on office developments as observed elsewhere. Together, my findings suggest an important role for developers, land owners, landscape architects, and tree protection policy in bird conservation.

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Impacts of landscape-scale windthrow and subsequent, variable reforestation on bird communities in Central Europe

10.1101/2020.06.18.159400 ◽

2020 ◽

Author(s):

Johannes Kamp ◽

Johanna Trappe ◽

Luca Dübbers ◽

Stephanie Funke

Keyword(s):

Norway Spruce ◽

Community Composition ◽

Central Europe ◽

Tree Species ◽

Secondary Succession ◽

Forest Disturbance ◽

Bird Species ◽

European Beech ◽

Bird Communities ◽

Long Distance

AbstractWith climate change, the area affected by and the intensity of forest disturbances such as windthrow, insect outbreaks and fire will be increasing. Post-disturbance forest management will be varied, and it is difficult to predict how much natural succession will be allowed in comparison to reforestation. Both, disturbance and reforestation will affect forest biodiversity globally, but potential shifts in species distribution, abundance and community composition are poorly understood.We studied the response of breeding bird communities to windthrow and different reforestation strategies in one of Central Europe’s largest contiguous windthrow areas created by storm Kyrill in 2007. A decade after the disturbance, we compared bird species diversity, population densities and community composition on plots in replanted beech, replanted conifers and secondary succession (all salvage-logged after the storm), with undisturbed old Norway spruce Picea abies as a control, in the setting of a natural experiment.Of the stands blown down, 95% were Norway Spruce. Reforestation strategies varied, with Spruce and non-native conifers planted on twice the area that was replanted with European Beech Fagus sylvestris. Large areas were still dominated by successional tree species a decade after the storm, especially birch, mirroring recommendations of sub-national forestry agencies to include secondary succession in future forest development. Birds responded strongly to windthrow, with a pronounced community turnover. Species associated with high conifer stands reached significantly lower densities on sample plots in disturbed areas. Replanted areas were characterized by mostly ubiquitous bird species. Areas dominated by secondary succession, especially birch Betula spp., were characterized by high densities of long-distance migrants (often species of conservation concern) and shrubland species, among them several indicator species.Our results suggest that an increase of forest disturbance across Central Europe will lead to a pronounced reorganisation of biodiversity. Strategies that allow more secondary succession, and avoid replanting allochthonous tree species are likely to benefit populations of depleted bird species, even at salvage-logged and cleared disturbance sites.

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Can guava monocultures (Psidium guajava L.) function as refuge for bird conservation?

Neotropical Biology and Conservation ◽

10.3897/neotropical.16.e70296 ◽

2021 ◽

Vol 16 (4) ◽

pp. 475-491

Author(s):

Cleverton da Silva ◽

Juan Ruiz-Esparza ◽

Fabiana Oliveira da Silva ◽

Cristiano Schetini de Azevedo ◽

Adauto de Souza Ribeiro

Keyword(s):

Agricultural Intensification ◽

Bird Community ◽

Psidium Guajava ◽

Bird Communities ◽

Semiarid Region ◽

Bird Conservation ◽

Field Observations ◽

Sensitive Species ◽

Tolerant Species ◽

List Method

Agricultural intensification negatively affects bird communities, and the response of birds to these changes varies from those that survive and increase their populations (disturb-tolerant species) to those that cannot adapt to new conditions and are regionally extinct (disturb-sensitive species). Thus, the present study sought to investigate the bird community in 39 guava orchards in the semiarid region of the state of Sergipe, northeast Brazil. Field observations were made between July and October 2017, through a one-hour visit to each orchard. Samplings were conducted using the MacKinnon’s List method. In addition to bird sampling, walks were carried out in the orchards to observe nesting. Seventy-six species of birds belonging to 30 families were recorded using the guava orchards. The most frequent species were Vanellus chilensis, Columbina talpacoti, Columbina picui, Crotophaga ani, Pitangus sulphuratus and Sporophila albogularis. Of the 186 nests recorded in the orchards, the majority (n = 144 nests; 77.4%) belonged to Columbina picui, Columbina talpacoti and Columbina minuta. The results demonstrate that the bird community in the guava orchards is formed only by disturb-tolerant species, showing that the studied guava orchards are not favorable to the conservation of disturb-sensitive birds of the Caatinga domain.

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Temporal dynamic of the phylogenetic diversity of the bird community of agricultural lands in Ukrainian steppe drylands

Biosystems Diversity ◽

10.15421/012006 ◽

2020 ◽

Vol 28 (1) ◽

pp. 34-40

Author(s):

A. I. Koshelev ◽

O. Y. Pakhomov ◽

O. M. Kunakh ◽

V. A. Koshelev ◽

M. P. Fedushko

Keyword(s):

Phylogenetic Diversity ◽

Bird Community ◽

Bird Communities ◽

The Other ◽

Alauda Arvensis ◽

Coturnix Coturnix ◽

The One ◽

Burhinus Oedicnemus ◽

Corvus Monedula ◽

Over Time

This study discussed the importance of the phylogenetic components in the structure of bird communities of anthropogenically transformed ecosystems. The investigation was conducted in the landscapes of the south and south-east of Ukraine in the nesting seasons 1988–2018. The bird community in the agricultural landscape was found to be presented by 10 species. The number of species was closely correlated with its phylogenetic analogue – Faith’s index. Both indices were stationary over time, as they do not show a statistically significant time trend. The two axes were extracted as a result of the DPCOA procedure and the permutation test showed their statistical significance. The axis 1 was the most sensitive to the opposite dynamics of the abundance of Coturnix coturnix and Burhinus oedicnemus on the one hand and Alauda arvensis and Melanocorypha calandra on the other. The axis 2 is the most sensitive to the opposite dynamics of Corvus monedula and Melanocorypha calandra on the one hand and Coturnix coturnix and Motacilla flava on the other. Based on phylogenetic diversity, the years can be clustered with the extraction of four relatively homogeneous phylogenetic structures of bird communities. The indicator of the initial period of dynamics (1988–1992) was Burhinus oedicnemus. Sowing or mechanical weeding may be considered as a major factor of nest destruction of Burhinus oedicnemus. The decreasing of the abundance of the trophic recourses because of agricultural activity may have caused the monotonous negative trend over time of the Burhinus oedicnemus populations. The period 1993–2003 was a transitional one, for which there were no clear indicators, as a characteristic feature of this period was the processes of bird community restructuring. The period 2004–2013 was characterized by the loss of Burhinus oedicnemus from the community and a sharp increase in the abundance of Corvus monedula. These species are distinguished by their phylogenetic specificity and are located on the periphery relative to the phylogenetic core of the community. There was growing importance in the community of such species as Alauda arvensis, Anthus campestris, and Melanocorypha calandra between 2014 and 2018. Our results also confirm the assumption that phylogenetic overdispersion is an important requirement for the stability of the bird community in anthropogenically transformed landscapes.

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Bird Communities In Seblat Nature Recreation Park (SNRP) North Bengkulu, Bengkulu

Biosaintifika Journal of Biology & Biology Education ◽

10.15294/biosaintifika.v8i1.4948 ◽

2016 ◽

Vol 8 (1) ◽

pp. 25

Author(s):

Eki Susanto ◽

Yeni Aryati Mulyani ◽

Bambang Suryobroto

Keyword(s):

Species Abundance ◽

Bird Species ◽

Biology Education ◽

Bird Community ◽

Bird Communities ◽

Community Similarity ◽

Point Count ◽

Net Method ◽

Logged Forest ◽

Vegetation Structures

Bird communities are the composition of several bird species that live together in the same place, time and interact with other birds. The diversity of birds in an area can be used as an indicator of stabilizing an area. Changes of vegetation structures due to logging practices can affect the availability of resources for bird communities. The objective of the research was to examine diversity, richness, bird species abundance and bird community similarity at HS1 (logged forest 1974), HS2 (logged forest 1989/1990) and HS3 (fully logged forest 1989/1990) in Seblat Nature Recreation Park (SNRP). The research was conducted in July – September 2013. Data collection was conducted by point count method (total 36 points) and mist net method (total 4752 nets hours). The Research showed 85 bird’s species from 33 families were recorded. HS2 was highest value of diversity and richness (H ‘= 3.63, DMG = 10.07). The highest relative abundance species in HS1 was Emerald Dove (Chalcophaps indica), while HS2 and HS3 were Slender-billed Crow (Corvus enca). The bird community similarity was highest in HS2 and HS3 (ISj = 0.58).How to CiteSusanto, E., Mulyani, Y. A., & Suryobroto, B. (2016). Bird Communities In Seblat Nature Recreation Park (SNRP) North Bengkulu, Bengkulu. Biosaintifika: Journal of Biology & Biology Education, 8(1), 25-32.

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Multi-cohort stand structure as a coarse filter of variation in mixedwood boreal bird communities

The Forestry Chronicle ◽

10.5558/tfc2013-063 ◽

2013 ◽

Vol 89 (03) ◽

pp. 327-339 ◽

Cited By ~ 1

Author(s):

Mike V.A. Burrell ◽

Jay R. Malcolm ◽

Pierre Drapeau

Keyword(s):

Structural Variation ◽

Bird Community ◽

Bird Communities ◽

Wildlife Habitat ◽

The Other ◽

Stand Age ◽

Feeding Guilds ◽

Management Approach ◽

Weibull Parameters ◽

Partial Harvest

In targeting mature and over-mature forests for harvesting, management in the boreal forest has resulted in a net loss of older forests that often exhibit complex structural variation and multiple cohorts of trees. Multi-cohort forest management has been proposed as a management approach for these older forests that maintains structural wildlife habitat attributes. At the stand level, the approach relies on various partial harvest techniques to emulate the range of structural variation found in natural boreal landscapes. Here, we examine the extent to which boreal bird communities respond to multi-cohort-related structural variation in boreal mixedwood forests. In particular, we test the utility of parameters of Weibull distributions fitted to stand stem diameter distributions, which have figured prominently in methods to characterize multi-cohort structure, to explain variation in the entire bird community and in various species groupings defined by feeding guilds and forest-type associations. We also compare the explanatory power of the two Weibull parameters against 21 forest structure variables and stand age. In general, Weibull parameters outperformed stand age as a correlate of bird community variation and they were significant explanatory variables for the matrix of all species and for four species groupings, whereas age was significant for only one species grouping. When one or the other Weibull parameter was significant, it also tended to be significant even when variation due to the other was partialled out, supporting the importance not only of forest stature, but also of forest heterogeneity in understanding bird community composition. Thus, we found that multi-cohort-associated structural variation was important in explaining variation among boreal bird communities, supporting the idea of silvicultural approaches that aim at diversifying stand structural characteristics.

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Writing in Aphasia Rehabilitation: Cursive vs Manuscript

Journal of Speech and Hearing Disorders ◽

10.1044/jshd.4104.523 ◽

1976 ◽

Vol 41 (4) ◽

pp. 523-529 ◽

Cited By ~ 3

Author(s):

Daniel R. Boone ◽

Harold M. Friedman

Keyword(s):

Correct Response ◽

The Other ◽

Read Aloud ◽

Writing Style ◽

Reading And Writing ◽

Manual Responses ◽

Significant Difference ◽

Written Form ◽

The Individual ◽

Read Number

Reading and writing performance was observed in 30 adult aphasic patients to determine whether there was a significant difference when stimuli and manual responses were varied in the written form: cursive versus manuscript. Patients were asked to read aloud 10 words written cursively and 10 words written in manuscript form. They were then asked to write on dictation 10 word responses using cursive writing and 10 words using manuscript writing. Number of words correctly read, number of words correctly written, and number of letters correctly written in the proper sequence were tallied for both cursive and manuscript writing tasks for each patient. Results indicated no significant difference in correct response between cursive and manuscript writing style for these aphasic patients as a group; however, it was noted that individual patients varied widely in their success using one writing form over the other. It appeared that since neither writing form showed better facilitation of performance, the writing style used should be determined according to the individual patient’s own preference and best performance.

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Multi-Center Study of Thromboplastin Calibration Precision – Influence of Reagent Species, Composition, and International Sensitivity Index (ISI)

Thrombosis and Haemostasis ◽

10.1055/s-0038-1651544 ◽

1993 ◽

Vol 69 (01) ◽

pp. 035-040 ◽

Cited By ~ 12

Author(s):

A M H P van den Besselaar ◽

R M Bertina

Keyword(s):

Oral Anticoagulants ◽

International Normalized Ratio ◽

The Other ◽

World Health ◽

Rabbit Brain ◽

Sensitivity Index ◽

Bovine Plasma ◽

Significant Difference ◽

The Mean ◽

International Sensitivity Index

SummaryFour thromboplastin reagents were tested by 18 laboratories in Europe, North-America, and Australasia, according to a detailed protocol. One thromboplastin was the International Reference Preparation for ox brain thromboplastin combined with adsorbed bovine plasma (coded OBT/79), and the second was a certified reference material for rabbit brain thromboplastin, plain (coded CRM 149R). The other two thromboplastin reagents were another rabbit plain brain thromboplastin (RP) with a lower ISI than CRM 149R and a rabbit brain thromboplastin combined with adsorbed bovine plasma (RC). Calibration of the latter two reagents was performed according to methods recommended by the World Health Organization (W. H. O.).The purpose of this study was to answer the following questions: 1) Is the calibration of the RC reagent more precise against the bovine/combined (OBT/79) than against the rabbit/plain reagent (CRM 149R)? 2) Is the precision of calibration influenced by the magnitude of the International Sensitivity Index (ISI)?The lowest inter-laboratory variation of ISI was observed in the calibration of the rabbit/plain reagent (RP) against the other rabbit/plain reagent (CRM 149R) (CV 1.6%). The highest interlaboratory variation was obtained in the calibration of rabbit/plain (RP) against bovine/combined (OBT/79) (CV 5.1%). In the calibration of the rabbit/combined (RC) reagent, there was no difference in precision between OBT/79 (CV 4.3%) and CRM 149R (CV 4.2%). Furthermore, there was no significant difference in the precision of the ISI of RC obtained with CRM 149R (ISI = 1.343) and the rabbit/plain (RP) reagent with ISI = 1.14. In conclusion, the calibration of RC could be performed with similar precision with either OBT/79 or CRM 149R, or RP.The mean ISI values calculated with OBT/79 and CRM 149R were practically identical, indicating that there is no bias in the ISI of these reference preparations and that these reference preparations have been stable since their original calibration studies in 1979 and 1987, respectively.International Normalized Ratio (INR) equivalents were calculated for a lyophilized control plasma derived from patients treated with oral anticoagulants. There were small but significant differences in the mean INR equivalents between the bovine and rabbit thromboplastins. There were no differences in the interlaboratory variation of the INR equivalents, when the four thromboplastins were compared.

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IMMUNOLOGICAL REACTIVITY OF INSULIN IN HUMAN SERUM

Acta Endocrinologica ◽

10.1530/acta.0.0530673 ◽

1966 ◽

Vol 53 (4) ◽

pp. 673-680 ◽

Cited By ~ 5

Author(s):

Torsten Deckert ◽

Kai R. Jorgensen

Keyword(s):

Normal Subjects ◽

The Other ◽

Human Pancreas ◽

Porcine Pancreas ◽

Crystalline Insulin ◽

Endogenous Insulin ◽

Significant Difference ◽

Human Sera ◽

Normal Human ◽

The One

ABSTRACT The purpose of this study was to investigate whether a difference could be demonstrated between crystalline insulin extracted from normal human pancreas, and crystalline insulin extracted from bovine and porcine pancreas. Using Hales & Randle's (1963) immunoassay no immunological differences could be demonstrated between human and pig insulin. On the other hand, a significant difference was found, between pig and ox insulin. An attempt was also made to determine whether an immunological difference could be demonstrated between crystalline pig insulin and crystalline human insulin from non diabetic subjects on the one hand and endogenous, circulating insulin from normal subjects, obese subjects and diabetic subjects on the other. No such difference was found. From these experiments it is concluded that endogenous insulin in normal, obese and diabetic human sera is immunologically identical with human, crystalline insulin from non diabetic subjects and crystalline pig insulin.

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