Articles by Author: Robert W Hopkins

Search results for Robert W Hopkins

We found 104 results for you
  1. The rediscovery of a lost frog: <em>Arthroleptis troglodytes</em> Poynton, 1963

    The rediscovery of a lost frog: <em>Arthroleptis troglodytes</em> Poynton, 1963

    Item type: Journal Article • Journal: African Zoology
    The cave squeaker Arthroleptis troglodytes Poynton, 1963 was first collected in 1961/62, and not observed again for 54 years despite several attempts to locate it. We rediscovered this species near the type locality in the Chimanimani mountain range in eastern...
  2. A NOTE ON GENERALISED SHIFTS

    A NOTE ON GENERALISED SHIFTS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A necessary and sufficient condition for a generalised shift on two symbols to be one-to-one is given. The criterion also holds when applied directly to shifts on more than two symbols. Two examples to illustrate the results are included.
  3. A POINTWISE CONVERGENCE THEOREM FOR SOME ERGODIC MEANS

    A POINTWISE CONVERGENCE THEOREM FOR SOME ERGODIC MEANS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A pointwise convergence theorem is proved for automorphisms with quasi-discrete spectrum.
  4. PRE-INDEPENDENCE BEHAVIOUR, MORPHOMETRICS AND TRAPPING OF FLEDGLING REDBREASTED SPARROWHAWKS

    PRE-INDEPENDENCE BEHAVIOUR, MORPHOMETRICS AND TRAPPING OF FLEDGLING REDBREASTED SPARROWHAWKS

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Simmons, Robert. 1984. Pre-independence behaviour, morphometrics and trapping of Redbreasted Sparrowhawks. Ostrich 55:158-162.
  5. NOTICE

    NOTICE

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
  6. SHORT NOTES

    SHORT NOTES

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
  7. REVIEWS

    REVIEWS

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
  8. SHORT NOTES

    SHORT NOTES

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
  9. COMPARISONS AND FUNCTIONS OF SKY-DANCING DISPLAYS OF <em>CIRCUS</em> HARRIERS: UNTANGLING THE MARSH HARRIER COMPLEX

    COMPARISONS AND FUNCTIONS OF SKY-DANCING DISPLAYS OF <em>CIRCUS</em> HARRIERS: UNTANGLING THE MARSH HARRIER COMPLEX

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Simmons, R. 1991. Comarisons and functions of sky-dancing displays of Circus harriers: untangling the marsh harrier complex. Ostrich 62:45-51.
  10. COMMENTARY

    COMMENTARY

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology