Habitat Quality, Population Density and Habitat-specific Productivity of Red-winged Blackbirds (Agelaius phoeniceus) in Boulder County, Colorado

The principle of urban-rural gradients can reveal the spatial variations of ecosystem services and socioeconomic dimensions. The interrelations between ecosystem services and socioeconomics have scarcely been considered in the context of urban-rural areas. We investigated the spatial gradients and the mutual linkages of several ecosystem services and socioeconomic variables in the urban-rural areas of Leipzig, Germany, and Kunming, China. The results showed some regularities in the spatial patterns of ecosystem services and socioeconomic dimensions in both study areas. Habitat quality and f-evapotranspiration of Leipzig and habitat quality of Kunming demonstrated apparent increasing trends along all gradient patterns. However, the other ecosystem services presented divergent spatial variabilities in different gradient patterns. Road density, urban fabric and population density showed identical declining trends in both case study areas. Differently, household size, housing area as well as unemployment rate in Leipzig presented inconsistent spatial dynamics with considerable fluctuations. With regard to the gradient interrelations, road density, urban fabric and population density were strongly correlated with most ecosystem services in both case study areas. In contrast, the gradients of household size, housing area and unemployment rate of Leipzig showed inconsistent correlations with the ecosystem services gradients. Our study provides evidence to the argument that typical patterns of ecosystem service gradients do not exist in different urban-rural areas.

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KAJIAN KUALITAS HABITAT DAN TINGKAT KEPADATAN MONYET HITAM SULAWESI (Macaca nigra) DI KESATUAN PENGELOLAAN HUTAN KONSERVASI (KPHK) TANGKOKO SULAWESI UTARA

AGRI-SOSIOEKONOMI ◽

10.35791/agrsosek.15.1.2019.23366 ◽

2019 ◽

Vol 15 (1) ◽

pp. 65

Author(s):

Dwi Yandhi Febriyanti ◽

Hengki Johannis Kiroh ◽

Saroyo ., Nfn

Keyword(s):

Forest Management ◽

Data Collection ◽

Population Density ◽

Habitat Quality ◽

Management Unit ◽

Quality Data ◽

Tree Level ◽

Density Level ◽

Important Value Index ◽

Number Of Individuals

This study aims to (1) evaluate the habitat quality of Black crested macaque at The Tangkoko Conservation Forest Management Unit, (2) analyze the population density level of Black crested macaque at The Tangkoko Conservation Forest Management Unit, (3) analyze the corelation between habitat quality and Black crested macaque density at The Tangkoko Conservation Forest Management Unit. The study was conducted from July to October 2017 in the Tangkoko Conservation Forest Management Unit, North Sulawesi. The material observed was the Black crested macaque and their habitat. The data collection method used is habitat quality data collection carried out by making sample plots measuring 25 m x 25 m for tree level observations in lanes with each distance between sample plots is 250 m. Data recorded for extraction and dominance of vegetation are species names, number of individuals and breast diameter at breast height. data collection on the density of Black crested macaque is done by way of inventorying animals directly through surveys in the field. Observations are carried out by walking at speeds of 1 - 1.5 km / h on each track and stopping at every 100 m to hear and observe the surroundings.Observations are carried out in the morning (6:00 - 11:00) and in the afternoon (14:00 - 17:00). Data recorded is the number of individuals found using the line transect method. Data analysis used (1) Important value index (INP) is a quantitative parameter that can be used to express the level of dominance (level of mastery) of species in the tree community. (2) Analysis of individual density is carried out according to the meeting of individuals in the group during observation (3) Parametric statistical tests ofPearson correlation. The results showed that (1) habitat quality parameters analyzed were important value index with the highest value of 95.63% in Cananga odorata on line A1; (2) the population density level of Black crested macaque was 9.66 individuals / km2. The highest amount of density is found on the T1 line where the T1 line is located in the Batuputih Tourism Park which routinely gets tourist visits. There are two pathways that are not found in the Black crested macaque namely T10 and A2 lines; (3) Based on the Pearson correlation analysis showed that the correlation between habitat quality and density of Black crested macaque that shows a positive value.*eprm*

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Relationships Among Habitat Quality, Home Range Size, Reproductive Performance and Population Density: Comparison of Three Populations of the Japanese Serow (Capricornis crispus)

Mammal Study ◽

10.3106/041.035.0406 ◽

2010 ◽

Vol 35 (4) ◽

pp. 265-276 ◽

Cited By ~ 3

Author(s):

Keiji Ochiai ◽

Kayoko Susaki ◽

Takashi Mochizuki ◽

Yasuhiro Okasaka ◽

Yusaku Yamada

Keyword(s):

Population Density ◽

Home Range ◽

Habitat Quality ◽

Reproductive Performance ◽

Home Range Size ◽

Range Size ◽

Japanese Serow

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Variations in adult body mass in roe deer: the effects of population density at birth and of habitat quality

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2001.1791 ◽

2002 ◽

Vol 269 (1492) ◽

pp. 747-753 ◽

Cited By ~ 122

Author(s):

Nathalie Pettorelli ◽

Jean-Michel Gaillard ◽

Guy Van Laere ◽

Patrick Duncan ◽

Petter Kjellander ◽

...

Keyword(s):

Population Density ◽

Body Mass ◽

Habitat Quality ◽

Roe Deer ◽

Adult Body Mass ◽

Adult Body

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Predicting conditions for migration: effects of density dependence and habitat quality

Biology Letters ◽

10.1098/rsbl.2007.0053 ◽

2007 ◽

Vol 3 (3) ◽

pp. 280-284 ◽

Cited By ~ 64

Author(s):

Caz M Taylor ◽

D. Ryan Norris

Keyword(s):

Population Density ◽

Density Dependence ◽

Habitat Quality ◽

Population Model ◽

Single Species ◽

Partial Migration ◽

Breeding Grounds ◽

Migration Strategies ◽

Effects Of Density

Migration is widespread among animals, but the factors that influence the decision to migrate are poorly understood. Within a single species, populations may be completely migratory, completely sedentary or partially migratory. We use a population model to derive conditions for migration and demonstrate how migratory survival, habitat quality and density dependence on both the breeding and non-breeding grounds influence conditions for migration and the proportion of migrants within a population. Density dependence during the season in which migratory and sedentary individuals use separate sites is necessary for partial migration. High levels of density dependence at the non-shared sites widen the range of survival values within which we predict partial migration, whereas increasing the strength of density dependence at the shared sites narrows the range of survival values within which we predict partial migration. Our results have important implications for predicting how contemporary populations with variable migration strategies may respond to changes in the quality or quantity of habitat.

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Andean bear (Tremarctos ornatus) population density and relative abundance at the buffer zone of the Chingaza National Natural Park, cordillera oriental of the colombian andes

Papéis Avulsos de Zoologia ◽

10.11606/1807-0205/2020.60.30 ◽

2020 ◽

Vol 60 ◽

pp. e20206030

Author(s):

Daniel Rodríguez ◽

Adriana Reyes ◽

Andres Quiñones-Guerrero ◽

Fidel Ernesto Poveda-Gómez ◽

Yeimy Castillo-Navarro ◽

...

Keyword(s):

Population Density ◽

Habitat Quality ◽

Relative Abundance ◽

Individual Recognition ◽

Buffer Zone ◽

Camera Traps ◽

Sampling Effort ◽

Colombian Andes ◽

Natural Park ◽

Conservation Actions

The Andean bear (Tremarctos ornatus) population density and relative abundance within the Chingaza Massif were assessed between September 2015 and May 2016. One hundred seventeen (117) camera traps were installed at 9 grids: 13 cameras per grid, each camera separated 750 m from the other; the sampling effort was 17,057 days-trap. Two thousand seven hundred eighty-four (2,784) native fauna records were obtained, 1,456 corresponding to mammals, 183 records for Andean bear specimens, 158 of them independent bear records (at least one hour between records), and 106 effective-independent bear records (also permitting individual recognition). Fifty-seven (57) Andean bear individuals were identified according to key external morphological features. Sixteen (16) adults were recaptured (12 males and 4 females), with a maximum mean distance of 27.22 km. Bears population density was 2.9 bears per 100 km². Based on this density and the buffer area of the sampling grids, we estimated an overall number of 122 bears in 4,215.15 km². The estimated density is the first for the species in Colombia and the lowest regarding previous reports from other countries. Thus, it is necessary to better understand how integral habitat quality and the anthropic impacts on habitat quality, availability, and connectivity may affect the Andean bear population densities in Colombia, as a useful tool for assessing populations` state and focus future conservation actions.

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