Download A Field Guide to the Atlantic Seashore by Kenneth L. Gosner PDF

By Kenneth L. Gosner

Более one thousand иллюстраций, сгруппированных по визуальному сходству, демонстрируют виды морских растений и животных атлантического побережья Северной Америки от залива Фанди до мыса Гаттерас. Путеводитель содержит советы, как находить различные виды, используя информацию по географическому распространению, местообитанию, сезону активности и климату.
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Extra resources for A Field Guide to the Atlantic Seashore

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Figs. 9). Such release biases and release-site biases can potentially be caused by different factors: 1. Navigational error. A priori, it appears very unlikely that a presumed avian map, extrapolated from one site (home) to a large unfamiliar surrounding region, represents the relevant spatial reality everywhere in a geometrically correct way without any distortions and, in addition, that birds master the geometry in a perfect way. 7 Conclusions and Perspectives 49 rather than that it is able to determine the accurate beeline course from everywhere.

May be reached. 1 Homing of Inexperienced Pigeons 27 Clearly, these exercises habituate the young pigeons to skilful flying, which is a precondition to home over long distances. In addition, flying around gives them an opportunity to becoming familiar with an aerial view of their home site and its closer vicinity. g. gradients) of environmental signals that are required to develop a navigational map. Thus, testing of whether free flights at home are a precondition for longdistance navigation was one of the early experiments on pigeon homing (Kramer and von Saint Paul 1954).

From top to bottom: vanishing bearings at the four release sites (distance from home 87–94 km); the same bearings pooled with respect to home and north (n=133 and 117); recoveries. Return rates are given as percentages of birds released. Inside circles is indicated direction and length of mean vectors. 2 Experience Gained by Homing Flights 29 ers landed soon afterwards nearby or disappeared low-flying behind trees or hills or otherwise in the vicinity. Nevertheless, some pigeons continued their flight sufficiently high to provide useful vanishing bearings.

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