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1

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Sex-Biased Pattern Variation in the Prey of Birds (1983)

Stamps, J A ; Gon, S M

Palo Alto, Calif. : Annual Reviews

Annual Review of Ecology, Evolution, and Systematics 14 (1983), S. 231-253

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ISSN: 0066-4162

Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Topics: Biology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1146/annurev.es.14.110183.001311

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2

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Estimating asymptotic size using the largest individuals per sample (1992)

Stamps, J. A. ; Andrews, R. M.

Springer

Oecologia 92 (1992), S. 503-512

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ISSN: 1432-1939

Keywords: Asymptotic size ; Largest individual ; Growth ; Anolis ; Lizard

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Estimates of asymptotic size are especially useful for comparative studies of taxonomic groups in which animals mature at small sizes relative to their final asymptotic sizes. The largest individuals per sample can provide reasonable estimates of asymptotic size if three conditions are met: 1) at least some adults in a population are near their final asymptotic size, 2) samples of a reasonable size are likely to contain a ‘largest individual’ that is near the average asymptotic size for the members of its sex, and 3) the coefficient of variation in asymptotic size is small for the members of each sex. In the current study, we show that all three of these conditions are met for one species of Anolis lizards (A. limifrons). For a series of samples from the genus Anolis, the largest individual per sample produces estimates of asymptotic size that are virtually identical to those produced by fitting field data on growth rates to nonlinear growth equations. These results suggest that the largest individual method can provide reasonable estimates of asymptotic size for the members of this genus, and imply that this method may also be useful for estimating asymptotic sizes in other taxa that satisfy the criteria listed above.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00317842

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3

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Relationships between spacing behavior and growth rates: A field study of lizard feeding territories (1989)

Stamps, J. A. ; Eason, P. K.

Springer

Behavioral ecology and sociobiology 25 (1989), S. 99-107

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ISSN: 1432-0762

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Relationships between spacing behavior and growth rates were investigated in a field experiment with juvenile lizards, Anolis aeneus. The behavioral variable most closely related to juvenile growth was distance moved per unit time. This variable had a curvilinear relationship with growth, such that juveniles moving approximately 400 cm/h grew more rapidly than those traveling either larger or shorter distances per unit time. Daily fluctuations in arthropod abundance were also related to growth rates, with restricted growth during periods of low food availability. Temporal fluctuations in prey and distance traveled per unit time had independent effects on growth; together these two variables accounted for 43% of the variance in growth rate for the juveniles in this study. Territory size, overlap and social status appeared to affect growth indirectly, by influencing distance traveled per unit time. Optimal travel distances of around 400 cm/h were most likely when a juvenile had a relatively exclusive territory of about 0.5 m2. High ranking juveniles were more apt to achieve this spacing pattern than were low ranking juveniles, but some high ranking juveniles had very large territories, extensive overlap with subordinates, supraoptimal travel distances and relatively low growth rates. Low ranking juveniles tended to fall into two groups: subordinates, with a small home range overlapping that of a more dominant individual and low travel distances, and floaters, with a large home range overlapping several more dominant individuals and high travel distances. Although a few low ranking juveniles achieved travel distances permitting high growth rates, most had either supra or suboptimal travel distances and relatively low growth rates.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00302926

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4

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The effect of conspecifics on habitat selection in territorial species (1991)

Stamps, J. A.

Springer

Behavioral ecology and sociobiology 28 (1991), S. 29-36

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ISSN: 1432-0762

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Despite widespread interest in habitat selection, many of the assumptions about how territorial animals choose habitats have not been tested. This study of juvenile Anolis aeneus lizards focuses on the relationship between the number of previous settlers in a habitat and the subsequent behavior of new arrivals at that habitat. Clearings containing the types of microhabitat preferred by juveniles were established in the field, several juvenile residents were allowed to establish territories in enclosures in the center of each clearing, and then naturally occurring immigrants were allowed access to the empty microhabitat surrounding the enclosures. Arrival rates and the probability of settlement were monitored on a daily basis from the day the first juveniles arrived until several days after the last juvenile had settled (=saturation). In each of seven trials, arrival rates were comparable early and late in the settlement process, and were unrelated to the degree of habitat saturation. Arrival rates did vary on a temporal basis, probably as a result of environmental factors affecting egg laying and hatching schedules, and habitats with high arrival rates saturated more quickly than those with lower arrival rates. All of the individuals arriving at the clearings did not settle, but settlers and non-settlers did not differ with respect to competitive ability, as measured by body size. The probability of settlement increased as settlement proceeded in each of seven trials, up to the day of saturation. These results refute the commonly held assumptions that prospective territory owners avoid entering relatively full habitats, and that they prefer to settle in relatively unsaturated habitats. The discussion considers why assumptions about the behavioral processes of habitat selection are so widely accepted, given the dearth of empirical information on the subject.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00172136

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Alert signals enhance animal communication in "noisy" environments (2008)

Ord, T. J. ; Stamps, J. A.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences of the United States of America. 2008; 105(48): 18830-18835. Published 2008 Nov 24. doi: 10.1073/pnas.0807657105.

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Publication Date: 2008-11-24

Print ISSN: 0027-8424

Electronic ISSN: 1091-6490

Topics: Biology , Medicine , Natural Sciences in General

Published by National Academy of Sciences

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Plasticity in social communication and its implications for the colonization of novel habitats (2016)

Ord, T. J., Charles, G. K., Palmer, M., Stamps, J. A.

Oxford University Press

In: Behavioral Ecology

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Publication Date: 2016-01-20

Description: Behavioral plasticity is expected to facilitate the colonization of novel habitats by allowing populations to respond rapidly to abrupt environmental change. We studied contextual plasticity—a form of plasticity that allows an immediate phenotypic response to stimuli—in the territorial communication of Puerto Rican Anolis lizards and considered the role it might play in facilitating colonization. In these lizards, the detection of territorial visual displays by receivers is acutely dependent on fluctuating levels of visual noise from windblown vegetation and ambient light. We quantified the contextual reaction norms of various components of the territorial displays of individual lizards as a function of visual noise and light for one focal population over many weeks of observation. We then compared these contextual reaction norms to the displays given by closely related Anolis species found in other environments to assess the extent to which colonizing lizards might be capable of performing displays similar to those likely to be effective in those environments. Our results suggest that lizards are able to rapidly adjust their territorial displays in ways that might help them communicate in other (but not all) habitat types on Puerto Rico. Given that the contextual plasticity of animal signals can be measured in free-living animals far more easily than other forms of behavioral plasticity, our study presents animal communication as a tractable model for tackling broad questions in how phenotypic plasticity might facilitate colonization, adjustment to environmental change, and adaptation.

Print ISSN: 1045-2249

Electronic ISSN: 1465-7279

Topics: Biology