Associations of Bobolink Territory Size with Habitat Quality

Diemer, Kristen M.; Nocera, Joseph J.

doi:10.5735/086.051.0607

Cited by 11 publications

(12 citation statements)

References 22 publications

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“…We calculated the area encompassed by minimum convex polygons using all the location data for each male using the mpc.area function in adehabitatHR. For 95% kernel density estimation, we established h ref as the smoothing parameter (Calenge, ) instead of the parameter calculated with least‐squares cross‐validation (Diemer & Nocera, ) because the latter may overestimate home ranges when having <50 locations (Seaman & Powell, ; Seaman et al., ). To obtain conservative KDE estimations, we performed a bootstrap analysis in which we randomly selected points with replacement from the location data set.…”

Section: Methodsmentioning

confidence: 99%

“…The home ranges of individuals (i.e., areas normally traversed while foraging and breeding; Burt, ) may vary among species depending on life‐history traits or within species due to variation in attributes of individuals (Börger et al., ). Variation within species is less well understood (Adams, ; Börger et al., ), and patterns of space use might vary depending on several biotic and abiotic factors (Diemer & Nocera, ). Within the home range lies the territory, an area of exclusive and intense use, often demarcated with visual or acoustic signals and defended with physical aggressions (Noble, ; Ringler, Ringler, Mendoza & Hödl, ; Tobias, Gamarra‐Toledo, García‐Olaechea, Pulgarín & Seddon, ).…”

Section: Introductionmentioning

confidence: 99%

“…Among extrinsic factors, home‐range and territory size are inversely related to population density (Morse, ), likely because interactions with neighbors influence establishment (Adams, ; Searcy & Beecher, ). Also, home‐range and territory size may reflect features of habitat quality including physical structure and resource availability (Diemer & Nocera, ; Duca & Marini, ; Smith & Sugart, ). Intrinsic factors such as individual behavior (e.g., aggressiveness) and physical condition may also influence territorial behavior (Brown, ; Hinde, ).…”

Section: Introductionmentioning

confidence: 99%

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Home‐range size of an Andean bird: Assessing the role of physical condition

2019

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Because space‐use patterns are a key aspect of the ecology and distribution of species, identifying factors associated with variation in size of territories and home ranges has been central to studies on population ecology. Space use might vary in response to extrinsic factors like habitat quality and to intrinsic factors like physical condition and individual aggressiveness. However, the role of these factors has been poorly documented in the tropics, particularly in high‐elevation bird species. We report the home‐range size of a Neotropical Andean bird, the gray‐browed brush finch (Arremon assimilis), and evaluate the role of physical condition in explaining variation in home‐range size among individuals. We performed spot mapping to estimate the home ranges of 14 territorial males in Bogotá, Colombia, using minimum convex polygons (MCP) and 95% kernel density estimators (KDE). The mean home‐range size estimated for the 100% MCP was 0.522 ± 0.305 ha (range = 0.15–1.18 ha), whereas the 95% KDE estimation was 0.504 ± 0.471 ha (range = 0.13–1.88). We calculated the real mass index of each bird as a proxy of physical condition to assess whether individuals in better physical condition had larger home ranges. Because we found no relation between our estimations of physical condition and home‐range size, we conclude that space use in this species might depend more on ecological factors such as habitat quality or neighbor density than on individual traits. Abstract in French is available with online material.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Home‐range size of an Andean bird: Assessing the role of physical condition

2019

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“…Davies & Houston ; Sergio et al . ; Temeles & Kress ; Diemer & Nocera ) or shelter availability (e.g. Yack et al .…”

Section: Introductionmentioning

confidence: 99%

“…For breeding or resting territory, the quality should be related to food availability (e.g. Davies & Houston 1983;Sergio et al 2007;Temeles & Kress 2010;Diemer & Nocera 2014) or shelter availability (e.g. Yack et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Early comers occupy popular territories in a lycaenid butterfly, Chrysozephyrus smaragdinus (Lepidoptera: Lycaenidae)

Takeuchi

2016

Entomological Science

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Territorial activities of a lycaenid butterfly, Chrysozephyrus smaragdinus, were observed throughout its adult season to investigate the territorial dynamics. The territories occupied earlier in the season were abandoned later than later‐occupied territories, indicating that the site preference of male C. smaragdinus was largely maintained during the adult season. Three indexes of territory quality based on animal preference, occupation duration (OD), initial occupation date (IOD) and the number of contests (NOC), were highly correlated. Therefore, these preference‐based indexes are consistent and reliable, although they are indirect estimates of benefits obtained from territories. Males arriving at territory sites early in the season were more likely to hold territories of better quality when NOC was used as the index of territory quality. The positive relationship between territory quality and male arrival date is congruent with the result of a previous study showing that early comers tend to hold a territory whereas late comers do not. However, male arrival date was not related to territory quality when OD or IOD was used as an index of territory quality. One possible reason for this apparent discrepancy is that the coefficient of variation of NOC is larger than those of OD and IOD, and therefore NOC could evaluate territory quality more quantitatively than the other two indexes. To date, studies of territoriality in butterflies have not considered the quality of territories. More studies considering the quality of territories will provide new insights into butterfly territoriality.

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