Get A Field Guide to the Atlantic Seashore PDF

By Kenneth L. Gosner

ISBN-10: 061800209X

ISBN-13: 9780618002092

Более a 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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F r a n c i s b a c o n (1561–1626): Essays, Of Praise. On the banks of the Plata I perceived the air tainted with the odour of the male Cervus campestris, at half a mile to leeward of a herd; and a silk handkerchief, in which I carried home a skin, though often used and washed, retained, when first unfolded, traces of the odour for one year and seven months. c h a r l e s d a r w i n : The Descent of Man, p. 529. The structures of vertebrate chemosignals reflect their functions and the environment they are used in.

In most mammal species the skin glands typically occur only in, or are larger or more numerous in, males. For example, only the male pronghorn has a pair of 45 46 odor production and release (a ) (b) (c) f i g u r e 3 . 9 The tarsal gland of black-tailed deer, dominated by sebaceous glands. (a) Location of the gland on the hock (T); a young male sniffs the gland. MT, metatarsal gland. (b) Increasing opening of the secretion- and urine-covered tuft of modified hair is seen left to right. (c) A section of skin (surface on the right) showing the tarsal gland with its apocrine (A) and sebaceous (S) gland elements and a hair (H).

Clb cloacal bone; cls, cloacal sac opening; fp, femoral pore; hp, hemipenis. ) Skin glands are thought to have evolved from scraped-off corneous material of the skin. Such “uncontrolled semiochemical release” may have given way to “facultative, controlled semiochemical release” of desquamated, loosely joined plugs of keratinous material when the germinal portion of the integumentary gland moved “below” the body surface. Invagination then created a “gland” (Maderson, 1986). 4 Birds Birds are not exactly known for scent communication or scentproducing organs.

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


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