Density-dependent home-range size revealed by spatially explicit capture-recapture

Ecography ◽  
2015 ◽  
Vol 39 (7) ◽  
pp. 676-688 ◽  
Author(s):  
M. G. Efford ◽  
D. K. Dawson ◽  
Y. V. Jhala ◽  
Q. Qureshi
Keyword(s):  
Home Range ◽  
Home Range Size ◽  
Range Size ◽  
Spatially Explicit ◽  
Density Dependent ◽  
Capture Recapture

Estimating jaguar (Panthera onca) density in a preserved coastal area of French Guiana

Mammalia ◽  
2018 ◽  
Vol 82 (2) ◽  
pp. 188-192 ◽  
Author(s):  
Matthis Petit ◽  
Thomas Denis ◽  
Ondine Rux ◽  
Cécile Richard-Hansen ◽  
Rachel Berzins
Keyword(s):  
Home Range ◽  
Coastal Area ◽  
French Guiana ◽  
Scale Parameter ◽  
Local Density ◽  
Home Range Size ◽  
Range Size ◽  
Spatially Explicit ◽  
Panthera Onca ◽  
Capture Recapture

AbstractKnowledge of the jaguar population is needed in French Guiana that faces an increase of human-jaguar conflicts. We carried out a camera trap survey to assess jaguar local density and home range size in a preserved coastal area of French Guiana. We ran spatially explicit capture recapture (SECR) models. In our model, the scale parameterσ, that is linked to the home range size, was larger for males (σ=3.87±0.59 SE km) than for females (σ=2.33±0.30 SE km). The assessed jaguar density was 3.22±0.87 SE ind. 100 km−2, which should be considered as an optimal density in a French Guiana coastal area.

Common octopus settled in human-altered Mediterranean coastal waters: from individual home range to population dynamics

2018 ◽  
Vol 76 (2) ◽  
pp. 585-597 ◽  
Author(s):  
P Arechavala-Lopez ◽  
M Minguito-Frutos ◽  
G Follana-Berná ◽  
M Palmer
Keyword(s):  
Home Range ◽  
Coastal Waters ◽  
Specific Growth ◽  
Home Range Size ◽  
Spatially Explicit ◽  
Management Actions ◽  
Mortality Probability ◽  
Population Sizes ◽  
Capture Recapture ◽  
Scr Model

Abstract A spatially explicit capture-recapture (SCR) model was applied to estimate simultaneously population parameters and individual activity (i.e. home range size) of O. vulgaris, based on experimental mark-recapture data in a human-altered Mediterranean coastal area. Seventy-two octopuses were captured, tagged with subcutaneous PIT-tags and released. Nineteen tagged individuals were recaptured (recapture rate: 26.4%) in the same area over the study period, which spanned over 6 months. Population sizes and densities decreased over the study period, from 337 octopuses (8 ind. ha−1) in September-October to 105 octopuses (2.5 ind. ha−1) in February-March. The highest recruitment probability was estimated to occur at the beginning of the study but it clearly decreased over time, while mortality probability during a fishing period slightly increased. Mean specific growth rate was 0.82 ± 0.11 day−1. Individual home range or activity area ranged from 2.8 ha to 7.3 ha (median home range radius: 121.8 m). Overall, these results suggest that human-altered coastal habitats, which are characterized by abundant shelters, abundant food and absence of predators, can act as settlement and growth areas for juveniles and adults of O. vulgaris. Furthermore, the methodologies applied in this study are recommended as innovative tools to improve management actions of coastal resources.

scholarly journals Spatial Capture-Recapture for Categorically Marked Populations with An Application to Genetic Capture-Recapture

2018 ◽  
Author(s):  
Ben C. Augustine ◽  
J. Andrew Royle ◽  
Sean M. Murphy ◽  
Richard B. Chandler ◽  
John J. Cox ◽  
...  
Keyword(s):  
Population Density ◽  
Home Range ◽  
Spatial Location ◽  
Home Range Size ◽  
Range Size ◽  
Structured Populations ◽  
Individual Identity ◽  
Data Set ◽  
Partial Identity ◽  
Capture Recapture

AbstractRecently introduced unmarked spatial capture-recapture (SCR), spatial mark-resight (SMR), and 2-flank spatial partial identity models (SPIM) extend the domain of SCR to populations or observation systems that do not always allow for individual identity to be determined with certainty. For example, some species do not have natural marks that can reliably produce individual identities from photographs, and some methods of observation produce partial identity samples as is the case with remote cameras that sometimes produce single flank photographs. These models share the feature that they probabilistically resolve the uncertainty in individual identity using the spatial location where samples were collected. Spatial location is informative of individual identity in spatially structured populations with home range sizes smaller than the extent of the trapping array because a latent identity sample is more likely to have been produced by an individual living near the trap where it was recorded than an individual living further away from the trap. Further, the level of information about individual identity that a spatial location contains is determined by two key ecological concepts, population density and home range size. The number of individuals that could have produced a latent or partial identity sample increases as density and home range size increase because more individual home ranges will overlap any given trap. We show this uncertainty can be quantified using a metric describing the expected magnitude of uncertainty in individual identity for any given population density and home range size, the Identity Diversity Index (IDI). We then show that the performance of latent and partial identity SCR models varies as a function of this index and produces imprecise and biased estimates in many high IDI scenarios when data are sparse. We then extend the unmarked SCR model to incorporate partially identifying covariates which reduce the level of uncertainty in individual identity, increasing the reliability and precision of density estimates, and allowing reliable density estimation in scenarios with higher IDI values and with more sparse data. We illustrate the performance of this “categorical SPIM” via simulations and by applying it to a black bear data set using microsatellite loci as categorical covariates, where we reproduce the full data set estimates with only slightly less precision using fewer loci than necessary for confident individual identification. The categorical SPIM offers an alternative to using probability of identity criteria for classifying genotypes as unique, shifting the “shadow effect”, where more than one individual in the population has the same genotype, from a source of bias to a source of uncertainty. We discuss the difficulties that real world data sets pose for latent identity SCR methods, most importantly, individual heterogeneity in detection function parameters, and argue that the addition of partial identity information reduces these concerns. We then discuss how the categorical SPIM can be applied to other wildlife sampling scenarios such as remote camera surveys, where natural or researcher-applied partial marks can be observed in photographs. Finally, we discuss how the categorical SPIM can be added to SMR, 2-flank SPIM, or other future latent identity SCR models.

Foraging Habitat, Home-Range Size and Diet of a Mediterranean Bat Species, Savi's Pipistrelle

2019 ◽  
Vol 20 (2) ◽  
pp. 351
Author(s):  
Marina Kipson ◽  
Martin Šálek ◽  
Radek Lučan ◽  
Marcel Uhrin ◽  
Edita Maxinová ◽  
...  
Keyword(s):  
Home Range ◽  
Home Range Size ◽  
Range Size ◽  
Foraging Habitat

scholarly journals Green morays (Gymnothorax funebris) have sedentary ways in mangrove bays, but also ontogenetic forays to reef enclaves

2021 ◽  
Author(s):  
Matthew S. Kendall ◽  
Laughlin Siceloff ◽  
Ashley Ruffo ◽  
Arliss Winship ◽  
Mark E. Monaco
Keyword(s):  
Home Range ◽  
Site Fidelity ◽  
Home Range Size ◽  
Range Size ◽  
Caribbean Region ◽  
History Of ◽  
High Site ◽  
Single Night ◽  
Exploratory Movements ◽  
Moray Eel

AbstractSurprisingly, little is known about basic life history of the largest moray eel species in the Caribbean region, the green moray eel (Gymnothorax funebris). Sixteen eels were captured from the mangrove fringe in multiple bays on St. Croix, USVI, implanted with coded acoustic transmitters, and their movements were tracked for up to 11 months using an array of 37 stationary acoustic receivers. They exhibited high site fidelity in the bays during their residence, using the same general parts of individual bays and did not switch bays except for one individual. There was no relationship between eel size (mean TL = 83 cm, range = 54–126 cm) and home range size (mean area of 95% KUD = 5.8 ha ± 0.7 SE). Most individuals were more frequently detected at night than during the day suggesting greater nocturnal activity. Several of the larger eels (mean TL = 93 cm ± 5.9 SE) showed clear and permanent emigration tracks out of the mangrove estuary to coral reef habitats offshore. For some individuals, these habitat shifts were preceded by exploratory movements away from the eel’s typical home range the night before emigration. All final emigration events took place nocturnally, happened during a single night, and occurred during months from December to May. Mean emigration speed was 3.4 km/h. This study is the first documentation of an ontogenetic habitat shift in moray eels, as well as the first determination of home range size for this species and their site fidelity in mangrove habitats.

Resource availability drives variation in a marsupial glider’s home‐range size

2021 ◽  
Author(s):  
A. M. Stobo‐Wilson ◽  
T. Cremona ◽  
B. P. Murphy ◽  
S. M. Carthew
Keyword(s):  
Home Range ◽  
Resource Availability ◽  
Home Range Size ◽  
Range Size

Personality and behavioral syndromes in two Peromyscus species: presence, lack of state dependence, and lack of association with home range size

2021 ◽  
Vol 75 (1) ◽  
Author(s):  
Victoria Underhill ◽  
Gregory G. Pandelis ◽  
Jeremy Papuga ◽  
Anne C. Sabol ◽  
Austin Rife ◽  
...  
Keyword(s):  
Home Range ◽  
State Dependence ◽  
Home Range Size ◽  
Range Size ◽  
Behavioral Syndromes
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